Great Crested Survey Report Backbridge Farm Persimmon July 2017

23 Short Lane Long Ashton Bristol BS41 9EH www.iesconsult.co.uk

0117 9113834 07977 437567 [email protected]

Integrated Ecological Solutions Ltd is a Registered Company in England and Wales No. 06941706

IES/2016/044 Backbridge Farm GCN Report

Quality Assurance

Job Number: IES/2016/044 Project Name: Backbridge Farm GCN Report Revision Description Originator Checked Authorised Date Number 001 Draft for TT TT June 2016 Comment

002 Final – TT TT July 2017 updated with new layout

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IES/2016/044 Backbridge Farm GCN Report

Contents

EXECUTIVE SUMMARY 4

1 INTRODUCTION 5

2 METHODOLOGY 6

3 RESULTS 8

4 EVALUATION AND RECOMMENDATIONS 13

5 CONCLUSIONS 16

6 REFERENCES 17

FIGURE 1: SITE LOCATION 18

FIGURE 2: SURVEY AREA 20

FIGURE 3: PONDS WHERE PRESENCE/ABSENCE SURVEYS WERE CARRIED OUT 22

FIGURE 4: EDNA SURVEY LOCATIONS 24

FIGURE 5: SURVEY RESULTS 26

FIGURE 6: POPULATION SIZE CLASSES 28

APPENDIX A: NOTES AND LIMITATIONS 30

APPENDIX B: ADAS EDNA METHODOLOGY 31

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Executive Summary

IES Consulting were instructed by Persimmon Homes to undertake a great crested newt survey at land adjacent to Backbridge Farm, Malmesbury, Wiltshire.

The aim of this study was to determine the use of the site, and ponds within 5oom of the site, by great crested . The site is heavily grazed grassland and no ponds are present within the site boundary, however it provides terrestrial for great crested newts.

It is proposed to build 227 residential dwellings on the site.

In 2013, Thompson Ecology carried out a great crested newt survey on land within 500m of the proposed Dyson Headquarters Expansion to the north of the Backbridge Farm site. The Dyson development is immediately adjacent to the Backbridge Farm proposed development site, and the habitat present is contiguous with the habitat on the Backbridge Farm site.

This survey identified 14 ponds with the potential to support great crested newts, nine of which were subsequently shown to support great crested newts. Figure 2 shows the ponds previously surveyed and the 500m buffer zone from the Backbridge Farm site.

Great crested newts ( cristatus) are protected under Schedule 5 of the Wildlife and Countryside Act 1981 and are listed under Schedule 2 of the Regulations 2010.

Great crested newts breed in ponds and associated wetlands features and hibernate in surrounding suitable terrestrial habitat such as hedgerows, rubble piles, log piles and wooded areas. Breeding ponds, routes to and from hibernating areas, terrestrial foraging areas and the hibernating areas are protected (as places of shelter) and must be identified through survey work.

In order to undertake work which will affect habitats known to support great crested newts, a derogation licence must be obtained from Natural England. This allows otherwise unlawful work to proceed legally.

There are ten waterbodies within 500m of the site boundary which support great crested newts, with a further waterbody (SW12) just outside the 500m buffer zone.

Pond SW10 was dry throughout the survey period, and whilst this remains true can be discounted from any future survey effort. Ponds SW1, SW9, SW13, SW14, N1 and N3 do not support great crested newts. The remaining ponds have all been shown to support small or medium populations of great crested newts, and the ponds within a 500m survey area of the site as a whole support a medium population of great crested newts.

Recommendations have been made for site enhancement in order to maintain and increase the population on the site. Overall it is felt that the current level of survey effort has identified the location of great crested newts on the site, and sufficient information on presence/absence and population size has been provided. Principles for gaining a European Protected Species Licence have been provided.

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1 INTRODUCTION

1.1 Background

1.1.1 IES Consulting were instructed by Persimmon Homes to undertake a great crested newt survey at land adjacent to Backbridge Farm, Malmesbury, Wiltshire, and centered on Grid Reference ST923883. A site location plan can be seen in Figure 1.

1.1.2 The aim of this study was to determine the use of the site, and ponds within 5oom of the site, by great crested newts. The site is heavily grazed grassland and no ponds are present within the site boundary, however it provides terrestrial habitat for great crested newts.

1.2 Development Proposals

1.2.1 It is proposed to build 227 residential dwellings on the site.

1.3 Previous Survey Work

1.3.1 In 2013, Thompson Ecology carried out a great crested newt survey on land within 500m of the proposed Dyson Headquarters Expansion to the north of the Backbridge Farm site. The Dyson development is immediately adjacent to the Backbridge Farm proposed development site, and the habitat present is contiguous with the habitat on the Backbridge Farm site.

1.3.2 This survey identified 14 ponds with the potential to support great crested newts, nine of which were subsequently shown to support great crested newts. Figure 2 shows the ponds previously surveyed and the 500m buffer zone from the Backbridge Farm site.

1.4 Legislative Background

1.4.1 Great crested newts (Triturus cristatus) are protected under Schedule 5 of the Wildlife and Countryside Act 1981 and are listed under Schedule 2 of the Habitats Regulations 2010.

1.4.2 Great crested newts breed in ponds and associated wetlands features and hibernate in surrounding suitable terrestrial habitat such as hedgerows, rubble piles, log piles and wooded areas. Breeding ponds, routes to and from hibernating areas, terrestrial foraging areas and the hibernating areas are protected (as places of shelter) and must be identified through survey work.

1.4.3 In order to undertake work which will affect habitats known to support great crested newts, a derogation licence must be obtained from Natural England. This allows otherwise unlawful work to proceed legally.

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2 METHODOLOGY

2.1.1 Notes and limitations are provided in Table 13 and Appendix A.

2.2 eDNA Testing of Ponds

2.2.1 The previous survey work demonstrated that 4 ponds had no evidence of use by great crested newts (SW1, SW9, SW10 – which was dry on all previous survey visits, and SW13). SW12 was shown to support a population of great crested newts but was outwith the 500m survey area from the edge of the development site. SW14 was also shown previously not to support great crested newts, but was not a candidate for eDNA testing due to water levels and suspended sediment.

2.2.2 It was therefore agreed with Jon Taylor (Wiltshire County Council Ecologist) that eDNA testing should be used on these ponds (with the exception of SW14) to verify that their status had not changed with respect to supporting great crested newts.

2.2.3 Water samples were collected from these ponds on 16th May 2016 according to the methodology prescribed by ADAS (Appendix B). These were then couriered to the ADAS laboratory on 18th May. SW10 was again dry at the time of survey.

2.3 Presence/Absence Surveys

2.3.1 Four presence/absence surveys were done on the remaining ponds with the exception of SW14 which did not contain great crested newts in any of the previous surveys, and had too little water and was too turbid with suspended sediment to allow successful eDNA testing. In addition, three new ponds had been completed on the land to the north at the time of the surveys, and these were included in the survey effort. Figures 3 and 4 show the location of each pond and the survey type carried out.

2.3.2 The surveys were carried out in accordance with the Great Crested Newt Conservation Handbook (Froglife 2001) and the Great Crested Newt Mitigation Guidelines (English Nature 2001), which are the current best practice guidance. Surveys were carried out by Tilly Tilbrook MCIEEM (Class Licence # 2016-19371-CLS-CLS) assisted by Vilas Anthwal, Luke Metcalf and Eleanor Hewins, all of whom are experienced ecological surveyors.

2.3.3 A combination of bottle-trapping, torching and netting was used at each pond, and four visits were undertaken at each pond. It was not considered that six visits were required because this was an update of the work undertaken in 2013, and great crested newts were known to still be present in the area following a translocation exercise on the land to the north.

Bottle Trapping

2.3.4 Traps were set containing an air bubble and were not left for longer than 17 hours overnight. All were checked and removed before 11am the following day. This complies with the Great Crested Newt Mitigation Guidelines welfare considerations (page 57). A density of approximately one trap per two meters of shoreline was used, however in places accessibility issues meant a reduced trapping effort had to be undertaken. It is not considered that this affected the results since it is known to be very difficult to accurately

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assess population size for this species, and because the results were to verify the work undertaken in 2013.

Torching

2.3.5 The entire margin of each pond was walked slowly, and a 1 million candlepower equivalent torch used to shine into the water. Any great crested newts seen were counted and recorded.

Netting

2.3.6 A long-handled dip net was used to sample the area around the pond edge, with 15 minutes of netting undertaken per 50m of shoreline. Whilst it is recommended that this is done at night when the newts are more likely to be in open water, the low water levels meant it was undertaken in the mornings when the traps were collected in so as not to stir up sediment and make torch surveys impossible.

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3 RESULTS

3.1 eDNA Results Table 1: eDNA Results Pond eDNA Water Turbidity Vegetation Description Number Result Temperature Cover (%) (˚C) SW1 Negative 22 High 25 Vegetation primarily sweet grass. Maximum depth approx. 45cm SW9 Negative 17.4 Moderate 85 Surface covered with algae. Little other vegetative growth. Maximum depth approx. 30cm SW10 N/A N/A N/A N/A Dry SW12 Positive 16 Low 85 Iris, glyceria and emergent flora make up the majority of vegetation. Maximum depth approx. 2.5m SW13 Negative 14.6 Low 90 Almost dry but fed from ditch. Choked with glyceria. Four m² of open water. Shaded by willow and alder

3.2 Presence/Absence Survey Results Table 2: SW2 Water Body Number: SW2

Survey Date Air Temp Water Temp # Bottle Bottle Trap Torch Smooth (˚C) (˚C) Traps Newts Present (P) / Absent M F J M F J (A) 05/04/2016 15 12.9 6 9 5 Nil 9 1 Nil P

18/04/2016 13.5 13.0 6 Nil Nil Nil Nil Nil Nil P

04/05/2016 15.2 19.6 6 Nil Nil Nil Nil Nil Nil P

10/05/2016 15.8 19.6 6 Nil 1 Nil Nil Nil Nil P

Table 3: SW3 Water Body Number: SW3

Survey Air Temp (˚C) Water Temp # Bottle Bottle Trap Torch Smooth Date (˚C) Traps Newts Present (P) / Absent M F J M F J (A) 05/04/2016 15 13.2 4 5 7 Nil Nil Nil Nil P

18/04/2016 13.5 12.2 4 Nil Nil Nil Nil 1 Nil A

04/05/2016 15.2 13.6 4 4 4 Nil Nil 1 Nil P

10/05/2016 15.8 19.6 4 8 5 Nil 3 Nil Nil P

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Table 4:SW4 Water Body Number: SW4

Survey Date Air Temp Water Temp # Bottle Bottle Trap Torch Smooth (˚C) (˚C) Traps Newts Present (P) / Absent M F J M F J (A) 05/04/2016 15 12.5 5 2 7 Nil 1 Nil Nil P

18/04/2016 13.5 12.9 6 Nil 2 1 5 1 1 P

04/05/2016 ------

10/05/2016 ------

Note: Pond had too little water and too much vegetation to allow trapping, torching or netting to continue after the second survey. Table 5: SW5 Water Body Number: SW5

Survey Air Temp (˚C) Water Temp # Bottle Bottle Trap Torch Smooth Date (˚C) Traps Newts Present (P) / Absent M F J M F J (A) 05/04/2016 15 13 5 Nil Nil Nil Nil Nil Nil A

18/04/2016 13.5 12.8 6 4 2 1 Nil Nil Nil P

04/05/2016 15.0 13.1 6 3 1 Nil 2 Nil Nil P

10/05/2016 15.8 18.2 6 5 2 Nil Nil Nil Nil P

Table 6: SW6 Water Body Number: SW6

Survey Air Temp (˚C) Water Temp # Bottle Bottle Trap Torch Smooth Date (˚C) Traps Newts Present (P) / Absent M F J M F J (A) 05/04/2016 15 13.2 7 2 10 Nil 8 6 Nil P

18/04/2016 13.5 12.4 7 1 Nil Nil 1 1 Nil P

04/05/2016 15.8 13.1 7 2 Nil Nil 8 3 Nil P

10/05/2016 15.8 18.4 7 12 13 Nil 1 2 Nil P

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Table 7: SW7 Water Body Number: SW7

Survey Air Temp (˚C) Water Temp # Bottle Bottle Trap Torch Smooth Date (˚C) Traps Newts Present M F J M F J (P) / Absent (A)

05/04/2016 15 14.6 9 1 Nil Nil 2 Nil Nil P

18/04/2016 13.5 14.4 9 Nil Nil Nil 1 Nil Nil P

04/05/2016 15.8 14.2 9 5 4 Nil Nil Nil Nil P

10/05/2016 15.8 21 9 13 7 1 Nil 1 Nil P

Table 8: SW8 Water Body Number: SW8

Survey Air Temp (˚C) Water Temp # Bottle Bottle Trap Torch Smooth Date (˚C) Traps Newts Present (P) / Absent M F J M F J (A) 05/04/2016 15 13.7 7 Nil Nil Nil 2 3 Nil P

18/04/2016 13.5 12.5 7 Nil Nil Nil 6 3 Nil P

04/05/2016 15.8 13.0 7 Nil Nil Nil 2 3 Nil P

10/05/2016 15.8 18.8 7 4 Nil Nil 3 1 Nil P

Table 9: N1 Water Body Number: N1

Survey Air Temp (˚C) Water Temp # Bottle Bottle Trap Torch Smooth Date (˚C) Traps Newts Present (P) / Absent M F J M F J (A) 05/04/2016 15 15.8 6 Nil Nil Nil Nil Nil Nil A

18/04/2016 13.5 15.1 6 Nil Nil Nil Nil Nil Nil A

04/05/2016 15.8 15.1 6 Nil Nil Nil Nil Nil Nil A

10/05/2016 15.8 20.9 Nil Nil Nil Nil Nil Nil Nil A

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Table 10: N2 Water Body Number: N2

Survey Air Temp (˚C) Water Temp # Bottle Bottle Trap Torch Smooth Date (˚C) Traps Newts Present (P) or Absent M F J M F J (A)

05/04/2016 15 16 6 Nil 1 Nil Nil Nil Nil A

18/04/2016 13.5 12.4 6 Nil Nil Nil Nil Nil Nil A

04/05/2016 15.8 13.3 6 Nil Nil Nil Nil Nil Nil A

10/05/2016 15.8 19.6 6 1 Nil Nil Nil Nil Nil A

Table 11: N3 Water Body Number: N3

Survey Air Temp (˚C) Water Temp # Bottle Bottle Trap Torch Smooth Date (˚C) Traps Newts Present (P) or Absent M F J M F J (A) 05/04/2016 15 16 6 Nil Nil Nil Nil Nil Nil A

18/04/2016 13.5 12.4 6 Nil Nil Nil Nil Nil Nil A

04/05/2016 15.8 13.0 6 Nil Nil Nil Nil Nil Nil A

10/05/2016 15.8 18.4 6 Nil Nil Nil Nil Nil Nil A

Table 12: Summary of peak counts and population size class estimates Water GCN Counts Peak Adult Population Size Population Size Body Visit 1 Visit 2 Visit 3 Visit 4 Count 2016 Class 2013 Class 2016 SW2 24 19 0 1 24 Small Medium SW3 12 1 8 3 12 Small Medium SW4 4 9 0 0 9 Small Small SW5 0 6 6 0 6 Small Small SW6 26 3 13 28 28 Medium Medium SW7 3 1 9 21 21 Small Medium SW8 5 9 5 12 12 Small Medium SW11 2 4 1 - 4 Small Small N1 0 0 0 0 0 N/A None N2 1 0 0 1 1 N/A Small N3 0 0 0 0 0 N/A None Total 77 52 42 66 77 Medium Medium Site Count

Table 13: Notes and limitations Comments, including other amphibian species recorded and survey constraints. - Denotes that the pond had dried up. Ponds N1, N2 and N3 were highly turbid on all surveys. SW11 was surveyed on different dates to all other ponds. The water level had dropped significantly in SW2 by survey three (04/05/2016). Other amphibian species recorded included and common frog.

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3.3 Summary

3.3.1 Pond SW10 was dry throughout the survey period, and whilst this remains true can be discounted from any future survey effort.

3.3.2 Ponds SW1, SW9, SW13, SW14, N1 and N3 do not support great crested newts and are not considered further in this report. (Tables 1, 9 and 11).

3.3.3 The remaining ponds (Tables 2-8, 10) have all been shown to support small or medium populations of great crested newts, and the ponds within a 500m survey area of the site as a whole support a medium population of great crested newts (Table 12). Figure 6 shows the population size class of each pond.

3.3.4 It should be noted that six visits are usually used to make population size class assessments. However, because this was an update of the 2013 survey, and because the peak counts gave similar size class results to the 2013 survey, it was felt that 4 surveys adequately described the status of the ponds in 2016.

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4 EVALUATION AND RECOMMENDATIONS

4.1 Evaluation

4.1.1 There are ten waterbodies within 500m of the site boundary which support great crested newts, with a further waterbody (SW12) just outside the 500m buffer zone.

4.1.2 The layout of the access road may lead to the loss of SW1, however it should be noted that this pond has never supported any great crested newts, and this was confirmed by eDNA testing in 2016. Therefore its loss will not have any impact on habitat for great crested newts, and will not require a licence.

4.1.3 The terrestrial habitat on site is limited in its value for great crested newts because of the management regime. Heavy grazing has led to a short sward developing in the majority of the grassland areas which will be affected by the development. Additionally, where the hedgerows are gappy (see IES 2016 Phase 1 Report), the constant movement of cattle in these areas has led to the ground becoming very compacted and less suitable for newts to use as hibernacula.

4.1.4 The translocation of terrestrial habitat on the Dyson site to the north of the development site demonstrated that the majority of the great crested newts are found close to the ponds. No great crested newts were captured along the southern edge of the fencing, which was located approximately 20m from the north of the Backbridge Farm site.

4.1.5 Where great crested newts were captured further from the ponds, this was always in association with hedgerows.

4.1.6 With this in mind, the recommendations have been made to reflect what is already known about the behavior of the great crested newt populations in the area.

4.2 Recommendations

4.2.1 A licence will be required from Natural England to allow the development to go ahead. This cannot be applied for until full planning permission has been granted, and a work schedule is required. This section sets out the principles of the licence application.

Trap and Translocate

4.2.2 A full trap and translocate effort across the whole site is not considered necessary. Instead, trapping will be concentrated in those areas considered most likely to contain great crested newts. Trapping will take place in the following areas:

❖ 5m out from any hedgerows to be removed;

❖ The working footprint of the balancing pond; and

❖ The working footprint of the northern end of the access road from the current tarmac area to 5m south of ponds SW2, 3 and 4.

4.2.3 Trapping will involve fencing the area with amphibian fencing, and placing pitfall traps at the recommended density (80 traps/ha) within the trapping area. Where the fencing

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fronts onto the Backbridge Farm development site, or is wholly within it, traps will be also be placed on the outside of the fencing, and if any great crested newts are trapped outside the fencing but within the development site, a discussion will be had with Natural England about whether or not the trap and translocate exercise should be extended.

4.2.4 A minimum of 60 trapping nights will be undertaken, and each area will only be considered to be clear if five consecutive trapping nights with no captures are completed. If 60 trapping nights do not provide five clear nights with no captures, the trapping will be continued until the area can be deemed to be clear.

4.2.5 Trapping will only be undertaken if the night time air temperature is above 5C, and that there has been recent enough rain that the ground is damp. Trapping will not extend beyond the end of October.

Habitat Manipulation

4.2.6 Habitat manipulation will be used to ensure newts are not harmed in other areas of the site. The vegetation will be removed to ground level during the day when newts are not active, and the working footprint area will not be allowed to develop a long sward of grass. Prior to works starting each day, a designated Biodiversity Champion will walk the working footprint area to check for newts.

4.2.7 In addition, the hedgerows to be removed will be cut to just above ground level (following all breeding bird requirements – see IES 2016 Phase 1 Report) prior to the trap and translocate effort being undertaken.

Destructive Search

4.2.8 In the areas which have been trapped, and in any other areas where the ecologist deems it necessary, a destructive search will be undertaken once it is considered that the trapping effort has been sufficient (see 4.2.4). This will involve the top layer of soil being removed using a toothed digger bucket under the supervision of a suitably experienced ecologist. Any newts found will be removed to a place of safety.

Receptor Site

4.2.9 Any newts captured at any point during the works will be moved to one of the waterbodies known to support great crested newts. It is considered highly probable that the great crested newts in each of the waterbodies and using all the terrestrial habitat form one population which moves between ponds.

4.3 Mitigation and Enhancement

4.3.1 Four new ponds are planned on the site – three balancing ponds to the south of the proposed development, and one along the western boundary of the site. Each of these ponds will have a hibernacula associated with it, built according to the specification in the Great Crested Newt Conservation Handbook (page 31).

4.3.2 There will be a 10m wide buffer strip along the northern boundary, which will be managed for great crested newts and which will be planted as a woodland belt in accordance with the comments from Jon Taylor in September 2016. The western boundary

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hedgerow will be retained and enhanced with new planting as illustrated on the landscape masterplan.

4.3.3 There will be a buffer strip along the eastern boundary, which where possible will be managed for great crested newts (this area is also an easement for services).

4.3.4 No pot drains will be used within 10m of any pond to ensure newts can still move freely between all the waterbodies and are not in danger of death from falling into the sewer system. As tilted kerbs cannot be used (Comments received from WCC Highways department), amphibian tunnels will be used in conjunction with permanent newt fencing to connect ponds SW2, 3 and 4 with the habitat to the north east. Likewise, at the entrance to the housing development, amphibian tunnels and permanent fencing will be used to connect the habitat along the hedge line in a north south direction if this cannot be kept at grade with no raised kerbs.

4.3.5 The area to the south of the site, where the balancing ponds are located, will be managed for wildlife including great crested newts, water vole and otter. The needs of these species can be met through one management programme.

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5 CONCLUSIONS

5.1.1 Backbridge Farm supports a population of great crested newts in waterbodies within 500m of the development site. The site is considered to be of high value for this species, and care will need to be taken when designing the development to ensure it does not adversely affect great crested newts.

5.1.2 Recommendations have been made for site enhancement in order to maintain and increase the population on the site. Overall it is felt that the current level of survey effort has identified the location of great crested newts on the site, and sufficient information on presence/absence and population size has been provided. Principles for gaining a European Protected Species Licence have been provided.

5.1.3 Additionally, the enhancement recommendations provide for biodiversity gain on the site as required under the National Planning Policy Framework. Therefore it is felt that there is no ecological barrier to granting planning permission for this development.

IES Consulting Ltd

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6 REFERENCES

Great Crested Newt Conservation Handbook. Froglife. 2001.

Great Crested Newt Mitigation Guidelines. English Nature. 2001.

HMSO The Conservation of Habitats and Species Regulations 2010.

HMSO Wildlife and Countryside Act 1981.

Integrated Ecological Solutions. Phase 1 report. 2016.

Thomson Ecology. Great Crested Newt Survey Report. 2013.

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FIGURE 1: SITE LOCATION

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IES/2016/044 Backbridge Farm GCN Report

FIGURE 2: SURVEY AREA

- 20 - Figure 2: 500m Survey Area

Key

Site Boundary 500m Buffer from site boundary Ponds New Ponds Previously Surveyed Ponds

N

Integrated Ecological Solutions23 Short Lane, Long Ashton, Bristol, BS41 9EH www.iesconsult.co.uk 0117 9113834 [email protected]

Project Backbridge Farm

Client Persimmon

Date May 2016 Scale See bar

Drawn TT Job # IES/2016/044 IES/2016/044 Backbridge Farm GCN Report

FIGURE 3: PONDS WHERE PRESENCE/ABSENCE SURVEYS WERE CARRIED OUT

- 22 - Figure 3: Ponds Where Presence/Absence Surveys Were Carried Out

Key

Site Boundary 500m buffer from site boundary Ponds No presence/absence survey Presence/absence survey

N

Integrated Ecological Solutions23 Short Lane, Long Ashton, Bristol, BS41 9EH www.iesconsult.co.uk 0117 9113834 [email protected]

Project Backbridge Farm

Client Persimmon

Date May 2016 Scale See bar

Drawn TT Job # IES/2016/044 IES/2016/044 Backbridge Farm GCN Report

FIGURE 4: EDNA SURVEY LOCATIONS

- 24 - Figure 4: eDNA Survey Locations

Key

Site Boundary 500m Buffer from site boundary Ponds eDNA not carried out eDNA carried out

N

Integrated Ecological Solutions23 Short Lane, Long Ashton, Bristol, BS41 9EH www.iesconsult.co.uk 0117 9113834 [email protected]

Project Backbridge Farm

Client Persimmon

Date May 2016 Scale See bar

Drawn TT Job # IES/2016/044 IES/2016/044 Backbridge Farm GCN Report

FIGURE 5: SURVEY RESULTS

- 26 - Figure 5: Survey Results

Key

Site Boundary 500m Buffer of survey area Ponds GCN absent GCN present

N

Integrated Ecological Solutions23 Short Lane, Long Ashton, Bristol, BS41 9EH www.iesconsult.co.uk 0117 9113834 [email protected]

Project Backbridge Farm

Client Persimmon

Date May 2016 Scale See bar

Drawn TT Job # IES/2016/044 IES/2016/044 Backbridge Farm GCN Report

FIGURE 6: POPULATION SIZE CLASSES

- 28 - Figure 6: Population Size Classes

Key

Site Boundary 500m Buffer of survey area Ponds: Population Size Class None Small Medium

N

Integrated Ecological Solutions23 Short Lane, Long Ashton, Bristol, BS41 9EH www.iesconsult.co.uk 0117 9113834 [email protected]

Project Backbridge Farm

Client Persimmon

Date June 2016 Scale See bar

Drawn TT Job # IES/2016/044 IES/2016/044 Backbridge Farm GCN Report

APPENDIX A: NOTES AND LIMITATIONS IES Consulting staff and their sub-consultants have endeavoured to identify the presence of protected species wherever possible on site, where this falls within the agreed scope of works.

Up to date standard methodologies have been used, which are accepted by Natural England (previously English Nature) and other statutory conservation bodies. No responsibility will be accepted where these methodologies fail to identify all species on site. IES cannot take responsibility where Government, national bodies or industry subsequently modify standards.

The results of the survey and assessment work undertaken by IES Consulting were representative at the time of surveying.

IES Consulting have advised on the optimum survey season for a particular habitat/species prior to undertaking the survey work. However, IES Consulting cannot accept responsibility for the accuracy of surveys undertaken outside this period.

IES Consulting cannot accept responsibility for data collected from third parties.

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APPENDIX B: ADAS EDNA METHODOLOGY

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Client: Tilly Tilbrook, ADAS Wolverhampton HQ 23 Short Lane, Pendeford House Long Ashton, Pendeford Business Park Bristol, Wobaston Road BS41 9EH Wolverhampton WV9 5AP

Tel: 01159 516747 Fax: 01159 516415 Email: [email protected]

www.adas.co.uk Sample/Report ID: 2016-601 Condition on Receipt: Low Sediment Visual Inspection of Volume: Passed Client Identifier: SW12 Description: 6x50mL - pond water samples in preservatives Date of Receipt: 19/05/16 Material Tested: DNA extracted from pond water samples

Determinant Result Method Date of Analysis Great Crested Newt Positive Real time PCR 25/05/16

Report Prepared by: Dr Helen Rees Report Issued by: Dr Ben Maddison

Signed: Signed: Position: Senior Research Scientist Position: Team Leader: Biotechnology Date of preparation: 25/05/16 Date of issue: 25/05/16

Notes: eDNA analysis was carried out in accordance with the stipulated methodology found in the Technical Advice Note (WC1067 Appendix 5 Technical Advice Note) published by DEFRA and adopted by Natural England.

ADAS is a trading name of ADAS UK Limited. Registered in England No. 3296903. Registered Office: ADAS Wolverhampton HQ, Pendeford House, Pendeford Business Park, Wobaston Road, Wolverhampton, WV9 5AP. ADAS UK Limited is a member of the ADAS group of companies

Client: Tilly Tilbrook, ADAS Wolverhampton HQ 23 Short Lane, Pendeford House Long Ashton, Pendeford Business Park Bristol, Wobaston Road BS41 9EH Wolverhampton WV9 5AP

Tel: 01159 516747 Fax: 01159 516415 Email: [email protected]

www.adas.co.uk Sample/Report ID: 2016-602 Condition on Receipt: Good Visual Inspection of Volume: Passed Client Identifier: SW13 Description: 6x50mL - pond water samples in preservatives Date of Receipt: 19/05/16 Material Tested: DNA extracted from pond water samples

Determinant Result Method Date of Analysis Great Crested Newt Negative Real time PCR 25/05/16

Report Prepared by: Dr Helen Rees Report Issued by: Dr Ben Maddison

Signed: Signed: Position: Senior Research Scientist Position: Team Leader: Biotechnology Date of preparation: 25/05/16 Date of issue: 25/05/16

Notes: eDNA analysis was carried out in accordance with the stipulated methodology found in the Technical Advice Note (WC1067 Appendix 5 Technical Advice Note) published by DEFRA and adopted by Natural England.

ADAS is a trading name of ADAS UK Limited. Registered in England No. 3296903. Registered Office: ADAS Wolverhampton HQ, Pendeford House, Pendeford Business Park, Wobaston Road, Wolverhampton, WV9 5AP. ADAS UK Limited is a member of the ADAS group of companies

Client: Tilly Tilbrook, ADAS Wolverhampton HQ 23 Short Lane, Pendeford House Long Ashton, Pendeford Business Park Bristol, Wobaston Road BS41 9EH Wolverhampton WV9 5AP

Tel: 01159 516747 Fax: 01159 516415 Email: [email protected]

www.adas.co.uk Sample/Report ID: 2016-603 Condition on Receipt: Good Visual Inspection of Volume: Passed Client Identifier: SW1 Description: 6x50mL - pond water samples in preservatives Date of Receipt: 19/05/16 Material Tested: DNA extracted from pond water samples

Determinant Result Method Date of Analysis Great Crested Newt Negative Real time PCR 25/05/16

Report Prepared by: Dr Helen Rees Report Issued by: Dr Ben Maddison

Signed: Signed: Position: Senior Research Scientist Position: Team Leader: Biotechnology Date of preparation: 25/05/16 Date of issue: 25/05/16

Notes: eDNA analysis was carried out in accordance with the stipulated methodology found in the Technical Advice Note (WC1067 Appendix 5 Technical Advice Note) published by DEFRA and adopted by Natural England.

ADAS is a trading name of ADAS UK Limited. Registered in England No. 3296903. Registered Office: ADAS Wolverhampton HQ, Pendeford House, Pendeford Business Park, Wobaston Road, Wolverhampton, WV9 5AP. ADAS UK Limited is a member of the ADAS group of companies

Client: Tilly Tilbrook, ADAS Wolverhampton HQ 23 Short Lane, Pendeford House Long Ashton, Pendeford Business Park Bristol, Wobaston Road BS41 9EH Wolverhampton WV9 5AP

Tel: 01159 516747 Fax: 01159 516415 Email: [email protected]

www.adas.co.uk Sample/Report ID: 2016-604 Condition on Receipt: Low Sediment Visual Inspection of Volume: Passed Client Identifier: SW9 Description: 6x50mL - pond water samples in preservatives Date of Receipt: 19/05/16 Material Tested: DNA extracted from pond water samples

Determinant Result Method Date of Analysis Great Crested Newt Negative Real time PCR 25/05/16

Report Prepared by: Dr Helen Rees Report Issued by: Dr Ben Maddison

Signed: Signed: Position: Senior Research Scientist Position: Team Leader: Biotechnology Date of preparation: 25/05/16 Date of issue: 25/05/16

Notes: eDNA analysis was carried out in accordance with the stipulated methodology found in the Technical Advice Note (WC1067 Appendix 5 Technical Advice Note) published by DEFRA and adopted by Natural England.

ADAS is a trading name of ADAS UK Limited. Registered in England No. 3296903. Registered Office: ADAS Wolverhampton HQ, Pendeford House, Pendeford Business Park, Wobaston Road, Wolverhampton, WV9 5AP. ADAS UK Limited is a member of the ADAS group of companies Appendix 1: qPCR GCN eDNA analysis results breakdown q-PCR GCN eDNA analysis Results

Experimental Samples Number of Positive Replicate Reactions*

Extraction Blank 0 of 12 SW12 3 of 12 SW13 0 of 12 SW1 0 of 12 SW9 0 of 12

Controls Number of Positive Replicate Reactions*

Negative PCR Control (Nuclease Free Water) 0 of 4 Positive Control GCN DNA 10-1 ng/µL 4 of 4 Positive Control GCN DNA 10-2 ng/uL 4 of 4 Positive Control GCN DNA 10-3 ng/µL 4 of 4 Positive Control GCN DNA 10-4 ng/µL 4 of 4

Inhibition Control Number of Positive Replicate Reactions † at Expected Ct value

SW12 0 of 2 SW13 0 of 2 SW1 0 of 2 SW9 0 of 2

Degradation Control

Expected rate of decay None expected within time frame SW12 Within Limits SW13 Within Limits SW1 Within Limits SW9 Within Limits

* A sample is considered as positive for great crested newt if any of the replicates are positive. † If the expected Ct value is not achieved, the sample is considered inhibited and is diluted as per the technical advice note prior to amplification with great crested newt primer and probes.

ADAS is a trading name of ADAS UK Limited. Registered in England No. 3296903. Registered Office: ADAS Wolverhampton HQ, Pendeford House, Pendeford Business Park, Wobaston Road, Wolverhampton, WV9 5AP. ADAS UK Limited is a member of the ADAS group of companies

Analytical and methodological development for improved surveillance of the Great Crested Newt

WC1067

Appendix 5. Technical advice note for field and laboratory sampling of great crested newt (Triturus cristatus) environmental DNA This report should be cited as: Biggs J, Ewald N, Valentini A, Gaboriaud C, Griffiths RA, Foster J, Wilkinson J, Arnett A, Williams P and Dunn F 2014. Analytical and methodological development for improved surveillance of the Great Crested Newt. Appendix 5. Technical advice note for field and laboratory sampling of great crested newt (Triturus cristatus) environmental DNA. Freshwater Habitats Trust, Oxford.

Version Control

Document date: 30 September 2014 Version Number: 1.1

2 Document date: 30 September 2014 Version Number: 1.1 Contents

1. Scope of document ...... 4 2. Quality assurance and quality control ...... 4 2.1 Laboratory standard ...... 4 2.2 Sample acceptance ...... 5 2.3 Stability of field sampling kits ...... 5 2.4 Outcome required ...... 5 2.5 Identification of risks of false positives and false negatives ...... 5 2.6 Laboratory specifications ...... 7 3. Field protocol ...... 10 3.1 Sampling equipment ...... 10 3.2 Field water sample collection protocol ...... 11 4. Laboratory protocol ...... 12 4.1 Introduction ...... 12 4.2 Analytical methods ...... 12 5. Data recording and reporting ...... 14 5.1 Sampling information ...... 14 5.2 Laboratory data ...... 14 6. References ...... 15 Appendix 1. Frequently asked questions about eDNA sampling from volunteer and non-specialist surveyors ...... 16 Appendix 2 Details of primers and probes ...... 17

3 Document date: 30 September 2014 Version Number: 1.1 1. Scope of document

Environmental DNA (eDNA) is nuclear or mitochondrial DNA that is released from an organism into the environment. Sources of eDNA include secreted faeces, mucous, and gametes; shed skin and hair; and carcasses. In aquatic environments, eDNA is diluted and distributed in the water where it persists for 7–21 days, according to the detection limits of qPCR approaches and associated fragment sizes, and depending on environmental conditions (Biggs et al. 2014). Recent research has shown that the DNA from a range of aquatic organisms can be detected in water samples at very low concentrations using qPCR (quantitative Polymerase Chain Reaction) methods.

This document provides technical advice for laboratories and field staff collecting and analysing samples for qPCR analysis of great crested newt (Triturus cristatus) environmental DNA. The document:

Sets out the standards required

Sets out field and laboratory approaches for screening the presence/absence of the great crested newts

Is designed to deliver a consistent approach, and hence comparable data, between laboratories for use in decision making.

Deviations from this protocol will need to demonstrate equivalence.

This document is based mainly on research undertaken during Defra project WC1067 “Analytical and methodological development for improved surveillance of the great crested newt” (Biggs et al. 2014). We advise that this report is used as a reference document for those carrying out great crested newt surveys using the methods described here.

2. Quality assurance and quality control

The methods described in this technical advice note are designed to reduce as far as possible the risk of field or laboratory generated false positive and false negative results. Quality control measures must be extended to sample collection, preservation and handling, as well as laboratory protocols, since assurances of sample quality will prove critically important to the avoidance of false negatives.

The field of aquatic eDNA is developing rapidly and it is likely that, as methods evolve, appropriate updates will need to be made to the processes detailed in this technical advice note.

2.1 Laboratory standard

Laboratories undertaking eDNA analysis should be able to demonstrate adequate quality assurance standards. Typically these will comprise a documented quality management system which would usually follow, or be equivalent to, the outline of ISO/IEC 17025 standard.

Ultimately it may be necessary to develop a proficiency testing scheme for eDNA analysis to enable the identification of laboratories certified as achieving the appropriate level of proficiency with the eDNA methods. At present a proficiency testing scheme for eDNA is not available because an appropriate proficiency testing methodology has not been established. Further research and development work will be needed to establish such a scheme.

In the meantime, agencies and organisations may wish to include samples from ponds known to support great crested newt and samples from sites known to be free from great crested newts to validate sampling programmes.

4 Document date: 30 September 2014 Version Number: 1.1 2.2 Sample acceptance

The laboratory analysing eDNA water samples should have a standard and documented sample acceptance procedure in place. This should include:

Date and time of sample receipt Sample condition (i.e. has the sample container been damaged in any way) A visual verification of the sample volume (to detect any leakages) A note to confirm appropriate handling in transit (e.g. courier packaging intact).

The receiving laboratory should transfer the sample number to the sample acceptance record at this point.

2.3 Stability of field sampling kits

The stability of field sampling kits should be assessed through the use of an appropriate artificial DNA marker to check for unexpected decay of DNA between sampling and sample analysis. Details of the marker used, expected rates of decay and actual decay rates should be published alongside eDNA results for the target species. The marker can be chosen by the laboratory or the marker used in WC1067 can be purchased from Spygen.

2.4 Outcome required Biggs et al. (2014) achieved a Limit of Quantification of 3 * 10-3 ng/L: at present there is no evidence that great crested newt eDNA can be quantified with precision and accuracy below this level. Failure to achieve detection at this limit will lead to increased risk of false negative results for sites where great crested newt occur at low density. There should be no detection of closely related species. In the case of the great crested newt in the UK, the risk is mainly of detecting the Italian crested newt (Triturus carnifex) which is present at a few of locations. The primers and probe were also tested on tissue samples of marbled newt (Triturus marmoratus). None of these samples were amplified, confirming the suitability of the primer pair and probe for the great crested newt. The primers and probe also did not bind with the DNA of other UK native newts (smooth and palmate newt) which are in the genus Lissotriton.

2.5 Identification of risks of false positives and false negatives

There are risks of both false positives and false negatives in eDNA analysis (Darling and Mahon, 2011). Errors can occur in both field and laboratory stages of the work. Given the test’s sensitivity it appears that the main risk from contamination will be from false positives.

The main risks, and their mitigation for great crested newt eDNA work, are:

(i) Molecular assay design: mitigated in research and development phase of primer and probe design. Salt free primers should be used. The quality of the primer and of the PCR mix is assured by the standards.

(ii) Laboratory quality control: mitigated by laboratory design and process control.

(iii) Sampling design: mitigated by site selection procedures in field monitoring programmes.

(iv) Uncertainty in the relationship between presence of target DNA and presence of viable target organisms: mitigated partially by research so far undertaken, and by future research increasing knowledge of great crested newt eDNA.

Table 1 summarises information on situations which may have an increased risk of generating false negatives and false positives, and potential ways to mitigate these risks. For the field sampling protocol, the risk of contamination may be greater for specialist contractors undertaking large numbers of great crested newt surveys compared to volunteers making infrequent visits to a small number of sites.

5 Document date: 30 September 2014 Version Number: 1.1 Table 1. Risk, and mitigation, of false positives and false negatives

Risk factor Mitigation

Field-based false positives

Cross contamination between Ensure that there is no contact between contaminated material sites (due to equipment, clothing and the water being preserved in the sampling process. etc.). Inflows, bringing eDNA from sites This risk cannot be eliminated at present and its extent is not with newts into unoccupied understood. Where ponds have inflows, survey teams will have ponds. Note that there is so far to make judgements about the likely impact of any inflow. little evidence that this is a However, the majority of great crested newt ponds lack significant problem but it is a substantial inflows. The presence/absence of inflows, and theoretical possibility. whether they are wet or dry at the time of survey should be recorded in field notes. Aquatic animals (e.g. herons, This risk cannot be eliminated and the extent to which it occurs is water voles) transferring newt currently unknown. Further research will be required to assess DNA between sites (e.g. in whether this is a significant risk, although at present it seems faeces, in water trapped in fur) likely to be small.

Field-based false negatives

Low numbers of newts This risk is minimised by following good field protocol. Note that at present the minimum number of newts that can be detected in different waterbodies is not known. However, ponds with torch counts of zero animals in the breeding season, where newts were known to be present, have provided positive eDNA results in the breeding season. Very wide, shallow drawdown To access deeper water areas it is possible that the water zones may increase the likelihood sampler could be added to a long pole. It is important not to of collecting water samples in enter the water as sediments will be disturbed which may areas where there has been no contain historical great crested newt DNA. Further research data newt activity even though the on sediment DNA is likely to be available within 6-12 months to pond is currently occupied. refine understanding of this issue. In all water depths it is necessary to gently stir the water throughout its depth, without disturbing sediments, as eDNA is believed to sink. It is advisable to avoid sampling very shallow water (less than 5-10 cm deep) as it may be difficult to avoid stirring up sediment in these areas. There is evidence that DNA is Avoid sampling in these areas: sample from water in areas less likely to be detected in water where vegetation is suitable for egg-laying and open water areas taken from densely packed mats suitable for displaying. of vegetation; either because of a lack of newt activity or because of the difficulty of sample collection in these areas. There is evidence that eDNA is Every effort should be made to access 20 sites around the pond less likely to be detected if the for sampling. Sites where 80-90% of pond margins were whole pond perimeter is not accessed achieved 99.3% detection rates. Attaching the sampled. sampling ladle to an extension pole may be an option for reaching a wider range of areas. Effective cleaning of the extension pole between sites is essential. The pole must be kept separate from any equipment that is in contact with newts.

6 Document date: 30 September 2014 Version Number: 1.1 Table 1 (cont). Risk, and mitigation, of false positives and false negatives

Risk factor Mitigation

Laboratory false positives

Contamination of eDNA sampling Mitigation is largely ensured by good laboratory design, set-up kits. and processes, particularly separation of the sample preparation room from all other stages of the process. Contamination during DNA Mitigation is largely ensured by physical separation of the amplification. different stages of the PCR process, use of dedicated equipment and lab coats for each stage and a uni-directional work flow from clean to DNA contaminated rooms. The risk of contamination in the Mitigation is largely ensured by good laboratory design, set-up laboratory is likely to be greatest and processes. It is to be expected that handing of smaller when larger numbers of samples batches of samples (i.e. <20 samples), in single trials, will be (>20) and multiple batches of easier than larger throughput operations. samples are handled.

Laboratory false negatives

Very low eDNA concentrations. Samples with DNA amounts below the Limit of Detection will generate false negatives. It is not currently possible to mitigate this risk.

2.6 Laboratory specifications

2.6.1 How the laboratory should be set up

The set-up of an eDNA laboratory should broadly follow the outline below. Note that this is not a detailed specification for building a laboratory: rather it provides guidance on the standard which is needed.

Successful eDNA work has so far been undertaken both in laboratories designed to standards established over the last 20 years for ancient DNA (aDNA) work (Knapp et al., 2012), and in more conventional DNA labs. There is as yet no evidence available to evaluate whether these different set-ups produce different results.

The main principles of the laboratory set-up should be (PHE, 2013):

● Physical separation of pre and post-PCR work: to prevent amplified DNA from contaminating samples there should be physical separation of pre and post PCR stages of the work. This should include separation of the area where sampling kits are prepared.

● Unidirectional workflow: The arrangement of activities in the rooms should be unidirectional to reduce potential for contamination. This can be achieved by physically having one room leading to another or by set working practices.

Two potential layouts of facilities based on existing constructed systems are exemplified below (Figure 1). The simpler design has some recognised limitations which are noted in the figure. Good results are known to have been produced in higher specification laboratories. The main features of the designs are:

7 Document date: 30 September 2014 Version Number: 1.1 ● Reagent preparation clean room: a clean DNA free room is needed for the preparation of field sampling kits. Samples containing DNA should never be brought into this room and no DNA extractions or PCRs are performed in this room1.

● Nucleic acid extraction room: the only area where DNA extractions are performed, and an area where PCR products and stocks of cloned material have not been handled.

● Amplification room: this is the area where PCR machines are housed. The schematic designs shown in Figure 1 fulfil these criteria.

2.6.2 Appropriate precautions to avoid laboratory contamination

As PCR products are ubiquitous in post-PCR laboratories it is important to make sure that no consumables or equipment for the DNA facility have been sourced from laboratories which undertake post-PCR amplification analysis.

Full body suits have been adopted by some eDNA laboratories for work in the sample kit preparation room and the eDNA sample preparation room, including full body suit, face masks, face shields and hairnets. In other rooms disposable laboratory coats are sufficient. Dedicated clean room shoes are useful to reduce carry-over contamination. Wearing two pairs of gloves will prevent exposure of skin when changing gloves. However, not all laboratory managers consider ‘suiting-up’ necessary, preferring separation of staff as the contamination control method (i.e. staff do not move between pre- and post-PCR laboratories). Those working with full body suits regard this approach as good practice for rare DNA work which generally reduces the amount of DNA present in the rooms to very low levels. Face masks reduce the breathing out of DNA which has been inhaled outside the clean rooms.

To reduce the risk of DNA contamination regular bleaching of the laboratory should be undertaken weekly. qPCR work should be undertaken inside a cabinet with UV light and in a room which is also lit by UV light outside the cabinet; to control aerosol DNA. Although UV lights are widely recommended for decontamination they need to be high power and close enough to the surface for decontamination to be effective and only then for low level contamination - cleaning and liquid decontamination is more effective (for detailed discussion see Champlot et al., 2010). They are also used in some laboratories to keep levels of environmental DNA low, including UV irradiating the facility when it is not in use.

Dedicated laminar flow hoods and fume hoods for DNA extraction and manipulation can reduce the risk of contamination still further. However, note that laminar flow hoods and fume hoods can under some circumstances make contamination worse by circulating contaminating aerosols around the laboratory. Most PCR hoods either do not have air flow, or are used switched off, providing a dedicated work station that is contained and can be easily decontaminated.

Further useful features are a positive pressure system and HEPA-filtered air conditioning. Some teams regard positive and negative pressure as desirable features to control contamination effectively. However, others suggest that procedural aspects are more important. At present it is not possible to tell which of these positions is correct. The more stringent standards of ancient DNA workers normally include positive / negative pressure and several successful laboratories working with eDNA have used this set-up. However, other groups have produced published results (e.g. Pilliod et al., 2013) without such systems. A highly specified laboratory (e.g. a forensic laboratory) may also have dedicated staff for each area because people are a major source of contamination. Vestibules with shoe/coat changing are effective techniques to prevent transfer of DNA in a highly specified laboratory, but can be adopted less expensively in less well specified laboratories by having dedicated shoes and coats for each laboratory.

1 It is possible that a Class II cabinet in a non-DNA free room could be used for this step. If this approach is used it would be advisable for laboratories to demonstrate that this process did not lead to contamination of sample test kits. Cabinets are at risk of contamination from DNA aerosols which can be present in DNA laboratories even with UV lighting.

8 Document date: 30 September 2014 Version Number: 1.1 Figure 1. Examples of laboratory specifications proposed or in use for eDNA work.

Laboratory layout based on Example of a more highly specified standard recommendations for laboratory based on standards PCR work typical for ancient DNA studies.

This approach was not used in the Defra WC1067 This approach was used in the Defra WC1067 project project, and could increase the risk of false positive results.

Reagent preparation room i.e. for water Sampling kit preparation room for sampling kit preparation. preparing the water sampling kits. This is a "DNA free zone": samples containing Rooms may be equipped with UV lights DNA are never brought into the room and to disrupt stray DNA (see note on no DNA extractions or PCRs are decontamination in Section 2.6.2) performed there.

This room is subject to positive pressure (to prevent entry of DNA) and is equipped with UV lights (see note 2.6.2). It is not yet clear that both steps (a) and (b) below can be undertaken in the same room, even with work area division. This set-up could lead to contamination of samples. Sample preparation room, the only

location at the facility where eDNA Sample preparation room i.e. DNA samples (rare or degraded DNA) are extraction and PCR set-up. extracted.

This area could be divided into two In highly specified facilities this room is subject to positive pressure. distinct areas (e.g. by flow hoods) for:

(a) sample preparation and negative controls (but note that flow hood would need to A "classical" DNA room, where contain a large centrifuge which may be extraction from tissues and swabs are impractical) performed. The room has a dedicated

(b) for positive control preparation (i.e. PCR chamber where the standards are tissue and swab extraction). added to the qPCR plate.

There is evidence that flow hoods may release Separation of the room where eDNA samples are DNA aerosols into the room, even with UV prepared from the room where qPCR standards treatment. We do not at present recommend are prepared reduces the risk of one this approach and laboratories using this design contaminating the other. should test that aerosol contamination is not occurring.

Amplification room where the qPCRs are performed.

Amplification room i.e. qPCRs are In highly specified facilities this room is subject to performed in this room. negative pressure (i.e. air enters but cannot leave). Alternatively it could also be in a separate building to prevent escape of amplified DNA to earlier preparation stages.

9 Document date: 30 September 2014 Version Number: 1.1 3. Field protocol

Field sampling should be undertaken by a suitably trained and experienced great crested newt surveyor (trained volunteer or professional). At present it is believed that eDNA water sampling does not disturb newts enough to justify the procedure being licensed by the national regulatory authority.

A single visit to the target pond should be made between mid-April and June, during the newt breeding season. eDNA samples can be collected at any time of day and in any reasonable weather conditions, including light rain. It may be best to avoid heavy rain as this makes sampling more difficult and might increase the risk of cross contamination (e.g. splashing of mud which could contain great crested newt DNA from wet ground). There is evidence that unpreserved amphibian eDNA decays slightly more quickly in full sun than shaded conditions, becoming undetectable after 8 and 11 days respectively (Pilliod et al., 2014), but as long as samples are preserved the impact on detection should be slight.

3.1 Sampling equipment

The field sampling equipment used by Biggs et al. (2014) has five components (Figure 2): A sterile 30 mL ladle A sterile self-supporting Whirl-Pak plastic bag with 1 L capacity A sterile 10 mL pipette to resample the pond water Six sterile 50 mL centrifuge tubes containing preservative (Absolute Ethanol (200 Proof), Molecular Biology Grade, Fisher BioReagents (Product Code: 10644795), sodium acetate and other markers) Two pairs of sterile gloves.

Figure 2 Sampling equipment used for eDNA water samples by Biggs et al. (2014)

Sterile plastic ladle Two pairs of sterile gloves

Self-supporting plastic bag to hold water Six individually sample during labelled sample tubes collection for preserving eDNA

Sterile plastic pipette

10 Document date: 30 September 2014 Version Number: 1.1 Kits can be stored at room temperature before use in an appropriate solvent store, consistent with Home Office regulations, and should be used within about two weeks of receipt. The time between kit receipt and use should be noted (see Section 5.1). Use one kit per pond up to an area of 1 ha. Beyond this, use an additional kit per hectare. However, note that as yet there is no practical experience of the effectiveness of kits used on ponds greater than 1 ha in area. Note that sampling techniques are still developing rapidly in this field and alternative preservatives to ethanol are currently being sought.

3.2 Field water sample collection protocol

The field sampling protocol should follow the steps outlined below. Gloves should be worn at all times during the sampling process, replacing the gloves between sample collection from the pond and pipetting into the sterile sub-sample tubes. Samples should be collected without entering the water, i.e. the surveyor stands only on the pond bank or muddy pond edges. This prevents disturbance of the substrate and may limit cross-contamination.

Stages of field sampling protocol

Step 1 Identify where 20 samples will be taken from the pond. The location of sub-samples should be spaced as evenly as possible around the pond margin, and if possible targeted to areas where there is vegetation which may be being used as egg laying substrate and open water areas which newts may be using for displaying.

Step 2 Open the sterile Whirl-Pak bag by tearing off the clear plastic strip c 1cm from the top (along the perforated line), then pulling the tabs. The bag will stand-up by itself.

Step 3 Collect 20 samples of 30 mL of pond water from around the pond (see 1 above) using the ladle (fill the ladle), and empty each sample into the Whirl-Pak bag. At the end the Whirl-Pak bag should be just under half full (600 mL).

NOTE: Before each ladle sample is taken, the pond water column should be mixed by gently using the ladle to stir the water from the surface to close to the pond bottom without disturbing the sediment on the bed of the pond. It is advisable not to sample very shallow water (less than 5-10 cm deep).

Step 4 Once 20 samples have been taken, close the bag securely using the top tabs and shake the Whirl-Pak bag for 10 seconds. This mixes any DNA across the whole water sample.

Step 5 Put on a new pair of gloves to keep the next stage as uncontaminated as possible.

Step 6 Using the clear plastic pipette provided take c15 mL of water from the Whirl-Pak bag and pipette into a sterile tube containing 35 mL of ethanol to preserve the eDNA sample (i.e. fill tube to the 50 mL mark). Close the tube ensuring the cap is tight.

Step 7 Shake the tube vigorously for 10 seconds to mix the sample and preservative. This is essential to prevent DNA degradation. Repeat for each of the 6 conical tubes in the kit. Before taking each sample, stir the water in the bag to homogenize the sample - this is because the DNA will constantly sink to the bottom.

Step 8 Empty the remaining water from the Whirl-Pack bag back into the pond.

Step 9 The box of preserved sub-samples is then returned at ambient temperature immediately for analysis. If batches of samples are collected and stored prior to analysis they should be refrigerated at 2-4° C. Kits can be stored for up to one month in a refrigerator before analysis. It is not necessary to freeze samples. Freezing may damage storage bottles, which can lead to leaking during transit, and also unnecessarily increases costs by requiring refrigerated transport. The length of time eDNA samples are stored in a refrigerator prior to analysis should be recorded and passed on to the analysing laboratory. Use an appropriate labelling system to ensure that the kits are supplied with a unique reference number.

11 Document date: 30 September 2014 Version Number: 1.1 4. Laboratory protocol

4.1 Introduction

This section describes the laboratory protocol for analysis of eDNA samples. It is assumed that laboratory staff are familiar with the techniques for using the proprietary products specified.

It is important that the analysing laboratory has no prior knowledge of whether sites being tested do or do not have newts. Samples should be identified only by a unique reference number which contains no site identifying information.

4.2 Analytical methods

Primers and probes

Great crested newt (Triturus cristatus) DNA should be amplified using the primers and probes listed in Appendix 2. They amplify a fragment of the mitochrondrial cytochrome oxidase I gene (cytb). It may be desirable for laboratories undertaking analyses to demonstrate that these primers and probes have been tested in vitro against real great crested newt tissue (which can be collected by external swabbing), and in situ from real ponds with great crested newts (unless they have already undertaken eDNA work with great crested newts). There are a number of amphibian biologists around the UK who have licenses to swab newts and they can be contracted to do this work. An alternative approach to standardisation is to purchase synthetic DNA.

Water

Water used in eDNA analysis should be ultrapure water for molecular biology grade, which can either be purchased or made in the laboratory, using proprietary equipment.

1. DNA extraction

DNA should be extracted using the DNA Blood and Tissue kit (Qiagen®) following the manufacturer’s instructions.

Step 1 For each sample from a site, the six subsamples per site should be centrifuged at 14000 x g1, for 30 minutes, at 6 °C and the supernatant discarded.

Step 2 360 µL of ATL Buffer from the DNeasy Blood & Tissue Extraction Kit (Qiagen®) is added to the first tube, the tube is vortexed for several minutes (time depends on degree of film accumulation on tubes) and the supernatant poured into the second tube. This operation is repeated for all the six tubes, resulting in the 6th tube containing the ATL buffer that has been vortexed sequentially in each of the six sample tubes. Vortexing is needed to remove films of DNA which become attached to the tubes at high centrifuge speeds. Flicking the tube or pipetting have not been found sufficiently vigorous to remove these films. Other kits may be suitable for this step but would need to be evaluated, perhaps as part of a proficiency testing process.

Step 3 The supernatant in the sixth tube, containing the DNA concentrated from all 6 sub- samples, is transferred to a 2 mL tube and the DNA extraction performed following the manufacturer’s instructions. The DNA extraction should be performed in the room or laboratory area dedicated for degraded DNA samples.

Step 4 An extraction control should be performed at the same time to monitor possible

1The centrifugation speed suggested originally by Ficetola et al. (2008) was 5500 x g. Internal tests made by Spygen indicated that better results were found with the highest centrifugation speed, which led to the adoption of 14,000 x g for the Great Crested Newt DNA extraction. 12 Document date: 30 September 2014 Version Number: 1.1 laboratory contamination. The extraction control is undertaken using an 11th tube containing buffers alone and no sample (i.e. no alcohol mix and no pond water). Note that the quality of the alcohol (i.e. absence of DNA contamination) is assessed with the negative controls in the field. These can be either out of range sites where great created newts are definitely absent or sites within the newt’s range where there is high certainty that newts are absent. If no negative field sites are available in a study, a different approach may be needed. In the analytical process the extraction control sample is, from Step 4 onwards, processed as a normal sample.

Additional control samples may be added to the process depending on where it is believed contamination may be originating.

2. qPCR

Step 5 DNA inhibition should be tested by adding a known amount of an artificial gene tothe sample and running qPCR in duplicate. If a different than expected Ct2 value is observed in a least one replicate, the sample should be considered inhibited. In this instance dilute the sample twice before amplification with great crested newt primer and probes.

Step 6 qPCR analysis. Each sample should be run in 12 replicates. A dilution series of T. -1 -1 -4 -1 -1 -2 -3 -4 cristatus DNA, ranging from 10 ng µL to 10 ng µL (increments 10 , 10 , 10 , 10 ) and measured using a Nanodrop ND-1000 or equivalent, should be used as a qPCR standard. The qPCR standards are made using DNA extracted from great crested newt tissue samples, and the quantification made on extracted DNA before the dilution. Samples should be run on a BIO-RAD® CFX96 Touch real time PCR detection system or equivalent.

Note that the standards are the positive controls for qPCR in this approach (i.e. assuring that the method successfully detects DNA when present). Negative controls are provided by one extraction blank, which is run with 12 replicates, as a normal sample, and with four qPCR negative controls which also run during the qPCR step, using ultrapure water for molecular biology grade.

Step 7 The quantitative PCR is performed in a final volume of 25 µL made up from: 3 µL of template DNA 12.5 µL of TaqMan® Environmental Master Mix 2.0 (Life Technologies ®)

6.5 µL of ddH2O 2 µL of primer (1 µL each of primer 10 µM TCCBL and TCCBR) 1 µL of probe (2.5 µM TCCB Probe)

Step 8 The PCR is performed under thermal cycling at 56.3 °C for 5 minutes and 95 °C for 10 minutes, followed by 55 cycles of 95 °C for 30 seconds and 52°C for one minute.

2(Ct = Ct threshold value, the number of PCR cycles after which amplification becomes exponential) 13 Document date: 30 September 2014 Version Number: 1.1 5. Data recording and reporting

Accurate detailed records of the sites surveyed should be kept by the commissioning ecologists for reporting, reference and auditing purposes.

5.1 Sampling information

Sampling kits should be identified by a unique identifying code when provided to field ecologists. All site information should be associated with this unique number. Laboratory staff do not need further site reference information.

The commissioning ecologists should maintain records which include:

Site name Nearest settlement (provides double check against grid reference errors) County (provides double check against grid reference errors) Time between receipt of sampling kit and date of sampling Date of sampling Personnel collecting sample Ordnance Survey grid reference, ideally to 1 m (i.e. a 12 figure grid reference) Site maps showing locations of sites Percentage of pond perimeter that is accessible for survey Data on inflows, and whether these were wet or dry at the time of survey If available, data on presence and number of great crested newt recorded during eDNA collection to help with further assessment / refinement of this technique Information on any difficulties experienced during sample collection.

5.2 Laboratory data

The laboratory should maintain records which include:

Personnel involved identified

Date of kit preparation Duration of storage of samples once returned from the field Dates of analysis Details on type and any degradation of the marker DNA in sample kits

A record of any modifications to standard operation procedures of laboratory equipment.

Standard laboratory data should be maintained by the laboratory.

Information on sample inhibition should be reported with the reporting of positive or negative DNA results.

At present there is no intention to archive eDNA samples although this may become necessary in the future.

14 Document date: 30 September 2014 Version Number: 1.1 6. References

Biggs J, Ewald N, Valentini A, Gaboriaud C, Griffiths RA, Foster J, Wilkinson J, Arnett A, Williams P and Dunn F. (2014). Analytical and methodological development for improved surveillance of the Great Crested Newt. Defra Project WC1067. Freshwater Habitats Trust: Oxford.

Champlot S, Berthelot C, Pruvost M, Bennett EA, Grange T, et al. (2010) An Efficient Multistrategy DNA Decontamination Procedure of PCR Reagents for Hypersensitive PCR Applications. PLoS ONE 5(9): e13042. doi:10.1371/journal.pone.0013042.

Darling JA and Mahon AR (2011). From molecules to management: Adopting DNA-based methods for monitoring biological invasions in aquatic environments. Environmental Research, 111, 978-988. Ficetola GF, Miaud C, Pompanon F and Taberlet P (2008). Species detection using environmental DNA from water samples. Biology Letters 4: 423.

Knapp M, Clarke AC, Horsburgh KA, Matisoo-Smith EA (2012). Setting the stage–building and working in an ancient DNA laboratory. Annals of Anatomy 194, 3-6.

PHE (2013). UK standards for microbiology investigations. Good laboratory practice when performing molecular amplification assays. Public Health England, London.

Pilliod DS, Goldberg CS, Arkle RS, Waits LP ( 2013). Estimating occupancy and abundance of stream amphibians using environmental DNA from filtered water samples. Canadian Journal Fisheries and Aquatic Sciences 70, 1123-1130.

Pilliod DS, Goldberg CS, Arkle RS, Waits LP (2014). Factors influencing detection of 736 eDNA from a stream-dwelling amphibian. Molecular Ecology Resources, 14, 109-116.

Thomsen P, Kielgast J, Iversen LL, Wiuf C, Rasmussen M, Gilbert MTP, Orlando L and Willerslev E (2012). Monitoring endangered freshwater biodiversity using environmental DNA. Molecular Ecology, 21: 2565-2573.

15 Document date: 30 September 2014 Version Number: 1.1 Appendix 1. Frequently asked questions about eDNA sampling from volunteer and non-specialist surveyors

What is eDNA? eDNA in the case of larger organisms, is DNA that is collected from the environment in which an organism lives, rather than directly from the plants or animals themselves. In aquatic environments, animals including amphibians and fish, shed cellular material into the water via their saliva, urine, faeces, skin cells etc. This DNA may persist for several weeks, and can be collected through a water sample, and analysed to determine if target species of interest have been present in the waterbody.

Why must surveyors remain out of the pond? There is a considerable risk of contaminating your pond sample by bringing in Great Crested Newt DNA in mud and water from other areas on your boots and equipment. This is a real risk: DNA can remain on surfaces even after they have been dried, and can persist in soil for many years. There are recorded examples of eDNA cross-contaminating pond water samples from surveyor’s boots.

Why are sampling points spread around the pond? Existing data shows that eDNA can be very patchy depending on where the animals have been. By sampling in many areas you considerably increase your chance of collecting their DNA successfully.

Why is the water column mixed before sampling? DNA ‘sinks’ and so will often be present in larger amounts close to the pond bottom. However, it is important not to collect sediment because it is currently thought that DNA may persist in the sediment for substantially longer than in the water column. If you collect sediment, there is a risk your sample might show a false positive indicating great crested newts were present recently, when in fact this was a long time in the past.

Why is such a large volume of water collected? In this methodology we collect a larger volume of water than previous methods have recommended (e.g. Thomsen et al. 2012). Our experience indicates that collecting a larger volume of water than was taken by Thomsen et al. (2012) is important to the success of the method.

Does it matter if I get things like duckweed, algae or zooplankton in my sample? No, small amounts don’t matter. However try not to collect bottom sediment in the sample, because the DNA can be absorbed by sediment and may give false positive results (see above).

What happens if I spill the preservative - or the sample tube itself If you spill some of the preservative from one of the tubes, just add proportionally less water from your pond sample. The samples from all six tubes are later combined for the laboratory analysis, so it’s not disastrous if some sample is lost.

Will samples degrade in the post? The preservative (alcohol) in the sample bottle will slow, but not eliminate, degradation of any DNA. Keeping the samples refrigerated also slows this process. The rate of decay during posting at ambient temperatures will be faster, but it will not be sufficient to degrade the sample completely.

What evidence is there to support the use of this technique? Defra project WC1067 has demonstrated the effectiveness of environmental DNA in the detection of Great Crested Newts. In detailed field studies eDNA detected Great Crested Newts 99.3% of the time in ponds where they were known to occur. When used by volunteers surveyors, eDNA detected Great Crested Newts at 91% of ponds where they were known to be present. No false positives were recorded from sites either outside or within the known range of the newt.

16 Document date: 30 September 2014 Version Number: 1.1 Appendix 2 Details of primers and probes

Primers are salt free and HPLC-purified.

Primer Sequence (5’-‘3) Fragment Gene

TCCBL CGTAAACTACGGCTGACTAGTACGAA 81 Cyt-b

TCCBR CCGATGTGTATGTAGATGCAAACA 81 Cyt-b

Probe

TCCB CATCCACGCTAACGGAGCCTCGC 81 Cyt-b

Degradation control

A length of artificial DNA is added to the samples to assess post-sampling degradation. This DNA does not have an analogue in the natural world so it can clearly be separated from all DNAs that can be sampled in the field. The structure of the molecule is commercially confidential to Spygen so is not reproduced in this guide. Laboratories may either design their own synthetic DNA or purchase material from Spygen.

17 Document date: 30 September 2014 Version Number: 1.1 Acknowledgements

We would like to thank all those who helped with Defra project WC1067 including the landowners who facilitated access to their sites, and particularly the many people and groups who volunteered time and resources to collect eDNA samples. This includes NARRS and PondNet volunteers, the team in Wales co-ordinated by Matt Ellis of Natural Resources Wales, who generated an excellent dataset for the detailed methodological component of the project, and Tom Langton who not only collected many eDNA samples, but provided access to a dataset from Suffolk extending over 20 years which has helped us to better interpret the relationship between eDNA and Great Crested Newt abundance. The project lead was Natasha Chick (Defra) and the Steering Group was Matt Ashton (Defra), Pete Brotherton (Natural England), Paul Edgar (Natural England), John McKinnel (Scottish Natural Heritage), Katharine Woods (Natural England) and Anna Robinson (JNCC). Our thanks also to Barbara Zweifel for delivering eDNA samples to France for analysis.

Specific thanks for technical advice on the preparation of this document are given to Neil Boonham (FERA), Simon Creer (Bangor University), Helen Rees (ADAS) and Kerry Walsh (Environment Agency), and to Mike Wilkinson and Katharine Woods (both of Natural England).

18 Document date: 30 September 2014 Version Number: 1.1