Fritillary Monitoring Results 2020 Dartmoor and Exmoor

Fritillary monitoring results 2020

Dartmoor and Exmoor

Jenny Plackett South West Regional Conservation Manager

Butterfly Conservation Company limited by guarantee, registered in England (2206468) Registered Office: Manor Yard, East Lulworth, Wareham, Dorset. BH20 5QP Charity registered in England and Wales (254937) and in Scotland (SCO39268)

www.butterfly-conservation.org

Contents

Summary of fritillary results across Dartmoor and Exmoor Page 3 High Brown Fritillary Page 3 Marsh Fritillary Page 4 Heath Fritillary Page 4 Pearl-bordered Fritillary Page 5 Small Pearl-bordered Fritillary Page 5 Acknowledgements Page 5

Appendices Appendix 1 Dartmoor High Brown Fritillary raw data and graphs Page 6 Appendix 2 Exmoor High Brown Fritillary raw data and graphs Page 7 Appendix 3 Dartmoor Marsh Fritillary raw data and graphs Page 8-10 Appendix 4 Exmoor Heath Fritillary raw data and graphs Page 11-12 Appendix 5 Dartmoor Pearl-bordered Fritillary Page 13-14 Appendix 6 Dartmoor Small Pearl-bordered Fritillary Page 15 Appendix 7 Exmoor Small Pearl-bordered Fritillary Page 15

Front cover images Clockwise from top left: Small Pearl-bordered Fritillary, Marsh Fritillary, Heath Fritillary, High Brown Fritillary, Pearl-bordered Fritillary

Summary Monitoring of the fritillary butterflies on Dartmoor and Exmoor was severely hampered by the covid pandemic, which resulted in fewer surveys being carried out, and fewer butterflies recorded overall. Travel restrictions coincided with the peak in the flight periods of the Pearl-bordered, Small Pearl- bordered and Heath Fritillary, so it’s likely that the abundance of these butterflies was not fully captured. Recording of adult Marsh Fritillary butterflies was also affected, however by August movement restrictions had been eased and the Marsh Fritillary larval web surveys were unaffected. Overall, the fritillaries had a mixed year in the South West, with High Brown Fritillary having an exceptional year, particularly on Dartmoor, whilst Marsh Fritillary appeared to have a poor year with abundance at the lowest point since 2013. Heath Fritillary did better than in 2019, but did not achieve the excellent numbers seen in 2018. The data should be read with extreme caution, however, since the reduced survey effort, and likely mis-timing of surveys outside of the peak in the flight period, will have certainly affected the results. Each species is presented in turn with a brief report: High Brown Fritillary, Marsh Fritillary and Heath Fritillary, with graphs showing the population indices for each species in Dartmoor and/or Exmoor, set against the national trend for that species. Results for Pearl-bordered Fritillary and Small Pearl-bordered Fritillary are also presented, although there was insufficient data to enable a regional trend to be calculated. Graphs for species abundance in individual landscape areas are displayed in the appendices, along with the raw data.

High Brown Fritillary

Population trend over the period 2002-2020

Dartmoor STABLE

Exmoor 1021% increase

Figure 1. Population trend of High Brown Fritillary on Dartmoor, Exmoor and the UK 2002-2020

In Dartmoor, High Brown Fritillary had an exceptional year, exceeding any in the 18 year monitoring period. Numbers have been increasing year on year since 2017, and the overall population trend averaged out over the full period remains stable. In the Dart Valley network, Aish Tor, Blackadon and Luckey Tor had very good numbers, which have been rising since 2017. Dartmeet, Leigh Tor and Great Combe fared less well, with numbers down on 2019, and none recorded at Great Combe. The Walkham Valley sites did exceptionally well, with higher numbers recorded than any in the 18 year annual monitoring period, and a comment from the surveyor that numbers were as he had remembered them being in the nineties! See Appendix 1 for raw data and graphs.

In Exmoor’s Heddon Valley, the butterfly also had a good year in 2020, increasing on the 2019 abundance, and doing reasonably well following the declines seen in the first half of the monitoring period. Over the full 18 year monitoring period, the butterfly has seen a 1021% increase in trend. Ladies Mile saw higher numbers than have been recorded over the last ten years, as did Trentishoe Combe (with the exception of 2014), whilst Mill Farm and King’s Lane Slope fared similarly to the last 3 years, but down on numbers recorded in 2016 and 2017. See Appendix 2 for raw data and graphs.

Marsh Fritillary

Population trend over the period 2005-2020

Dartmoor 423% increase

Figure 2. Population trend of Marsh Fritillary on Dartmoor and the UK 2005-2020 2020 was not a good year for the Marsh Fritillary on Dartmoor, however the long term population trend for the species in this landscape shows a 423% increase over the 16 year monitoring period. Numbers tend to fluctuate on around 5-7 year cycles of ‘boom/bust’; hopefully numbers will rise in 2021 from the low seen in 2020. Marsh Fritillary is found across four metapopulations on Dartmoor, and the butterfly fared quite poorly in all four, with one or two sites in each network bucking the trend with a more positive result. In the Tavy valley network, good numbers were seen at Hillbridge Farm; in the Postbridge West Webburn valley system Challacombe Farm saw good numbers; in the Fernworthy Long-Lane system Langaford Farm stood out with good numbers; whilst in the Tor Valley, Venton Farm held its own whilst other sites were unoccupied. See Appendix 3 for raw data and graphs.

Heath Fritillary

Population trend over the period 2004-2020

Exmoor STABLE

Figure 3. Population trend of Heath Fritillary on Exmoor and the UK 2005-2020

Overall the Heath Fritillary had a reasonably good year on Exmoor, with many sites having higher abundance than recorded in 2019, although the extraordinary numbers seen in 2018 were not replicated. The Exmoor population trend for the butterfly during the monitoring period 2004-2020 is stable, set against a declining trend for the UK as a whole (see Figure 3 above). The Holnicote Estate sites did well overall, with Heath Fritillary recolonising two sites, Nutscale Reservoir and Mansley Combe (the former site being extinct since the early 1990s), and strong numbers were recorded at core sites. The Grabbist Ridge sites did not fare so well, although numbers were at least higher than 2019. Hopcott Common and Perriton Combe were not surveyed but the three core breeding areas along the ridge were disappointing. It may be that the peak was missed on these sites, as the majority of surveys on Holnicote Estate were undertaken between 28th May and 2nd June, whilst the Grabbist sites were not visited until 15th June. Haddon Hill was also visited on 15th June, probably also missing the peak, as numbers were considerably down on the 2017-18 high (although still exceeded abundance during the years 2012- 2016). See Appendix 4 for raw data and graphs.

Pearl-bordered Fritillary Spring started early in 2020, with warm and sunny weather throughout late March-May, and the Pearl-bordered Fritillary is likely to have emerged and peaked earlier than in most years. Unfortunately, the covid-related travel restrictions limited survey activity, as we were all obliged to stay very local to home during April. A couple of survey visits were made to sites in the Dart and Walkham Valleys, but the resulting data was insufficient to calculate a regional population trend. The Aish Tor count was slightly lower than numbers seen in 2018 and 2019, but slightly above average for the ten year period. It was pleasing to see numbers recover somewhat at Walkham Valley, following no records in 2019. Several visits were made to the Haldon Forest sites where the butterfly is doing reasonably well at the Haldon Forest site (Kidden’s Plantation), although numbers appear to be declining at North Wood. See Appendix 5 for raw data and graphs.

Small Pearl-bordered Fritillary A small number of surveys were carried out for Small Pearl-bordered Fritillary across Dartmoor and Exmoor, although these records were often made whilst recording Pearl-bordered Fritillary (which generally peaks earlier than SPBF) or Marsh Fritillary (which generally peaks later than SPBF on Dartmoor), so the timing of the survey visits were not always optimal for the butterfly and the peak in flight period may have been missed. Insufficient data was collected to enable calculation of a population trend. See Appendix 6 for raw data.

Acknowledgements

With grateful thanks to all those who have helped with the 2020 monitoring programme – thank you so much for all your efforts, and please do help again in 2021! Thanks too to the many land managers, commoners and landowners who are working hard to keep their fritillary habitat in good condition to enable the butterflies to thrive on their land. Jenny Plackett South West Senior Regional Conservation Manager [email protected] 07918 073654 5

Appendix 1: Dartmoor High Brown Fritillary

Wind speed (code) Wind

HBF Time adjusted Time HBF

Durationofsearch

Meantemperature

Mean% sunshine

Confirmed

HB/DGF

DGF

Site Name Grid Ref. Date Aish Tor SX705705 01/06/2020 40 120 20.0 Aish Tor SX705705 24/06/2020 23 100 0 9 40 12 13.5 Blackadon SX713732 16/06/2020 20 50 2 2 40 2 7 3.0 Blackadon SX713732 24/06/2020 23 100 0 12 45 1 0 16.0 Dartmeet South SX673725 26/06/2020 20 50 2 2 36 0 5 3.3 Dartmeet South SX673725 24/06/2020 23 100 0 2 30 5 0 4.0 Deeper Marsh, Newbridge SX714712 24/06/2020 23 100 0 2 20 3 0 6.0 Dunsford SX785892 07/07/2020 18 50 2 0 101 0 2 0.0 Great Combe SX689694 18/07/2020 18 50 2 0 48 0 0 0.0 Haytor Down SX781775 25/06/2020 0 30 12 2 0.0 Haytor Down SX781775 24/06/2020 23 100 0 0 45 6 0 0.0

Luckey Tor SX685723 26/06/2020 20 0 2 4 103 0 41 2.3 Luckey Tor SX685723 24/06/2020 23 100 0 24 45 0 0 32.0 Leigh Tor SX711713 24/06/2020 23 100 0 2 20 2 0 6.0 Leusdon SX707723 24/06/2020 23 100 0 0 2 15 0 0.0 Newbridge Hill SX709712 16/06/2020 18 30 2 0 31 0 6 0.0 Walkham Valley - Bucktor SX476697 22/06/2020 22 70 2 4 40 3 6 6.0 Walkham Valley - Bucktor SX476697 23/06/2020 4 31 7 5 7.7 Walkham Valley - North Roborough DownSX503698 - lower area23/06/2020 by viaduct 14 25 6 5 33.6 Walkham Valley - North Roborough DownSX503698 - lower area21/06/2020 by viaduct 18 40 0 6 20 2 18.0 Walkham Valley - West Down SX484703 22/06/2020 20 60 2 2 45 2 8 2.7 Walkham Valley - West Down SX484703 21/06/2020 18 50 0 9 30 0 0 18.0 Dartmoor High Brown Fritillary timed count data 2020

Dart Valley High Brown Fritillary timed count results 2010-2020

Walkham Valley High Brown Fritillary timed count results 2002-2020

Appendix 2: Exmoor High Brown Fritillary

Wind speed (code) Wind

HBF Time adjusted Time HBF

Durationofsearch

Meantemperature

Mean% sunshine

Confirmed

HB/DGF

DGF

Species Site Name Grid Ref. Date HBF King's Lane Slope SS659482 30/05/2020 22 100 1 11 40 1 3 16.5 HBF Mill Farm/Kittitoe SS660469 30/05/2020 22 100 1 5 40 1 2 7.5 HBF Ladies Mile main slope SS641477 30/05/2020 22 100 1 23 25 8 3 55.2 HBF Trentishoe Combe SS649483 30/05/2020 22 100 1 66 40 21 13 99 HBF Hardy Park - No survey

Exmoor High Brown Fritillary timed count data 2020

Heddon Valley High Brown Fritillary timed count results 2010-2020

Appendix 3: Dartmoor Marsh Fritillary

This sheet is designed for data recorded on the Nf1: Timed Count Recording Form Nf2: TIMED COUNT DATA SHEET View the comments attached to the column headings for guidance on data entry

Mean temperature Mean

Wind speed (code) Wind speed

Duration of searchDuration of

Mean % sunshine % sunshine Mean

Confirmed

Species Site Name Grid Ref. Date Marsh Fritillary Bittleford Farm/Rowden SX700765 30/05/2020 19 80 2 0 60 Marsh Fritillary Broadaford Farm SX695770 26/05/2020 20 100 2 24 70 Marsh Fritillary Broadaford Farm SX689773 28/05/2020 20 100 2 31 105 Marsh Fritillary Burrator SX561693 20/05/2020 1 Marsh Fritillary Challacombe Farm SX694793 28/05/2020 20 99 4 28 45 Marsh Fritillary Challacombe Farm Field SX695791 20/05/2020 10 Marsh Fritillary Common Wood marsh SX527798 20/05/2020 2 Marsh Fritillary Common Moor, Clawton SS369015 28/05/2020 15 100 2 0 33 Marsh Fritillary Drywell SX695751 25/05/2020 22 100 3 2 35 Marsh Fritillary East Shallowford SX693758 25/05/2020 22 100 3 4 80 Marsh Fritillary Ford Farm SX724818 05/06/2020 15 50 2 9 76 Marsh Fritillary Hillbridge Farm field SX531802 20/05/2020 50 Marsh Fritillary Holwell Lawn SX741779 27/05/2020 100% 1 2 10 Marsh Fritillary Huccaby Farm SX658733 29/05/2020 21 100 3 34 44 Marsh Fritillary Langaford SX698845 20/05/2020 68 60 Marsh Fritillary Lizwell Mead SX697776 29/05/2020 20 80 2 8 60 Marsh Fritillary Lower Hurston (South) SX688843 30/05/2020 100 1 33 25 Marsh Fritillary Lower Hurston (North) SX688846 30/05/2020 100 1 1 10 Marsh Fritillary Luckcroft, Ashwater SS398004 25/05/2020 20 100% 4 2 20 Marsh Fritillary Middle Merripit SX648798 29/05/2020 19 100 3 26 79 Marsh Fritillary Oaklea, Aswater SS404999 02/06/2020 20 100 5 1 25 Marsh Fritillary Quoditch SS406981 25/06/2020 20 100 3 0 55 Marsh Fritillary Riddon Farm SX677763 31/05/2020 19 80 1 9 50 Marsh Fritillary Ruddycleave /Buckland Common SX731742 27/05/2020 100 1 24 20 Marsh Fritillary Soussons Farm (South) SX686788 28/05/2020 17 98 3 85 53 Marsh Fritillary Middleton Barton (Blackdown Hills)ST177115 01/06/2020 115 45 Dartmoor Marsh Fritillary adult butterfly timed count data 2020

Appendix 3: Dartmoor Marsh Fritillary cont.

This sheet is designed for data recorded on the Nf1: Timed Count Recording Form Nf2: TIMED COUNT DATA SHEET View the comments attached to the column headings for guidance on data entry

Duration of searchDuration of

MF Time adjusted

Confirmed

Species Site Name Grid Ref. Date Marsh Fritillary (webs) Broadaford Farm - northern end SX689773 31/07/2020 1 60 1.0 Marsh Fritillary (webs) Broadaford Farm - southern end SX695770 31/07/2020 1 60 1.0 Marsh Fritillary (webs) Burrator SX559694 10/09/2020 1 #DIV/0! Marsh Fritillary (webs) Challacombe Farm SX694793 03/09/2020 10 20 30.0 Marsh Fritillary (webs) Challacombe Farm Field SX695791 03/09/2020 0 15 0.0 Marsh Fritillary (webs) Common Wood marsh SX527798 24/08/2020 0 15 0.0 Marsh Fritillary (webs) Common Moor, Clawton SS369015 31/08/2020 0 Marsh Fritillary (webs) Corndon Ford Farm SX692747 31/07/2020 14 60 14.0 Marsh Fritillary (webs) Cross Gate - Burrator SX560693 04/09/2020 1

Marsh Fritillary (webs) DWT Emsworthy Mire - East side 07/09/2020 0 SX746767 Marsh Fritillary (webs) East Shallowford Farm SX693758 06/09/2020 2 75 1.6 Marsh Fritillary (webs) East Shallowford Farm SX693758 03/09/2020 0 35 0.0 Marsh Fritillary (webs) Fernworthy Reservoir SX662842 03/08/2020 0 45 0.0 Marsh Fritillary (webs) Ford Farm SX724818 20/07/2020 1 30 2.0 Marsh Fritillary (webs) Great Tree SX695902 05/08/2020 0 12 0.0 Marsh Fritillary (webs) Grendon Farm (South) SX688781 30/07/2020 2 60 2.0 Marsh Fritillary (webs) Grendon Farm (North) SX686786 30/07/2020 0 25 0.0 Marsh Fritillary (webs) Higher Hurston SX685839 22/07/2020 0 20 0.0 Marsh Fritillary (webs) Hillbridge Farm field SX531802 30/08/2020 27 80 20.3 Marsh Fritillary (webs) Hillbridge Farm field SX531802 24/08/2020 21 20 63.0 Marsh Fritillary (webs) Hilltown Farm SX536807 24/08/2020 1 45 1.3 Marsh Fritillary (webs) Huccaby Farm SX658733 24/08/2020 3 75 2.4 Marsh Fritillary (webs) Kendon Farm SX716818 10/08/2020 0 60 0.0 Marsh Fritillary (webs) Kendon Farm SX716818 20/07/2020 1 30 2.0 Marsh Fritillary (webs) Langaford SX698845 22/07/2020 46 46 60.0 Marsh Fritillary (webs) Langaford SX698845 30/07/2020 57 120 28.5 Marsh Fritillary (webs) Lizwell Mead SX697776 04/08/2020 5 80 3.8 Marsh Fritillary (webs) Lower Creason SX529805 24/08/2020 0 45 0.0 Marsh Fritillary (webs) Lower Hurston (South) SX688843 11/08/2020 9 60 9.0 Marsh Fritillary (webs) Lower Hurston (North) SX688846 11/08/2020 1 10 6.0 Marsh Fritillary (webs) Lower Hurston (South) SX688843 22/07/2020 10 45 13.3 Marsh Fritillary (webs) Lower Hurston (North) SX688846 22/07/2020 4 15 16.0 Marsh Fritillary (webs) Luckcroft, Ashwater SS398004 11/08/2020 0 Marsh Fritillary (webs) Middle Merripit SX648798 30/07/2020 0 60 0.0 Marsh Fritillary (webs) Oaklea, Aswater SS404999 11/08/2020 0 Marsh Fritillary (webs) Puddaven SX712838 11/08/2020 17 60 17.0 Marsh Fritillary (webs) Riddon Farm SX677763 07/08/2020 6 50 7.2 Marsh Fritillary (webs) Ruddycleave /Buckland Common SX731742 31/08/2020 1 30 2.0 Marsh Fritillary (webs) Runnage SX663788 30/07/2020 4 90 2.7 Marsh Fritillary (webs) Shapley SX714733 11/08/2020 11 120 5.5 Marsh Fritillary (webs) Soussons Farm (North) SX661787 30/07/2020 0 25 0.0 Marsh Fritillary (webs) Soussons Farm (South) SX686788 10/09/2020 7 65 6.5 Marsh Fritillary (webs) Venton Farm SX696904 05/08/2020 10 60 10.0 Marsh Fritillary (webs) Vogwell Cottage SX721821 20/07/2020 8 30 16.0 Marsh Fritillary (webs) Vogwell Farm (North) SX718823 20/07/2020 14 30 28.0 Marsh Fritillary (webs) Vogwell Farm (North) SX718823 10/08/2020 28 60 28.0 Marsh Fritillary (webs) Vogwell Farm (South) SX726816 20/07/2020 4 15 16.0 Marsh Fritillary (webs) Waye Cross Farm SX695897 05/08/2020 0 20 0.0 Marsh Fritillary (webs) West Corndon Farm SX688847 03/08/2020 3 40 4.5 Marsh Fritillary (webs) West Corndon Farm SX689848 11/08/2020 2 20 6.0 Marsh Fritillary (webs) Middleton Barton (Blackdown Hills) ST177115 04/08/2020 51 60 51.0 Dartmoor Marsh Fritillary larval web timed count data 2020 9

Appendix 3: Dartmoor Marsh Fritillary cont.

Tavy Valley Marsh Fritillary time adjusted larval web data 2010- 2020

Fernworthy-Long Lane Marsh Fritillary time adjusted larval web data 2010-2020

Postrbridge-West Webburn Marsh Fritillary time adjusted larval web data 2010-2020

Tor Valley Marsh Fritillary time adjusted larval web data 2010- 2020

Appendix 4: Exmoor Heath Fritillary

Total time mean temp % max searched Site name Grid ref Date Recorder Start time 0C sunshine windspeed No: seen (mins) Time adjusted Alcombe Common SS974439 15/06/2020 JP 10.30 18 50% 2 7 40 10.5 Aller Combe - lower SS893425 PC / JS 108 43 combe 02/06/2020 75.35 Aller Combe -eastern SS898428 PC / JS 49 22 end/Hollow Combe

02/06/2020 66.82 Aller Combe upper SS895424 PC / JS 34 23 combe 02/06/2020 44.35 Aller Combe (all areas see above PC / JS 191 88 combined) 02/06/2020 65.11 Aller Combe SS893425 MW 24 100% 1 26 30 02/06/2020 52 Bagley Combe SS876422 PC / JS 0 17 02/06/2020 0 Bagley Combe SS876422 MW 24 100% 1 0 15 02/06/2020 0 Bin Combe SS905410 MO 13.30 26 100% 1 51 75 28/05/2020 40.8 Giant's Chair SS982437 15/06/2020 JP 11.00 18 50% 1 2 10 12 Grabbist Hill SS976436 15/06/2020 JP 11.20am 18 50% 1 9 40 13.5 Grabbist Hill (Hole's SS969437 30/05/2020 MP 3 10 Corner) 18 Haddon Hill SS985287 15/06/2020 JP 14.45 18 60% 1 23 30 46 Halse Combe - North of SS893455 MO + PC & 10.20 26 100% 1 45 60 stream 28/05/2020 JS 15 Halse Combe - South of SS893455 MO + PC & 10.35 26 100% 1 35 45 stream 28/05/2020 JS 15.55 Halse Combe see above MO + PC & 80 105 (combined) 28/05/2020 JS 15 Halse Combe - North of SS893455 DL 25 45 stream 01/06/2020 33.3 Halse Combe - both SS893455 MW 24 100% 1 61 45 sides of stream 02/06/2020 81.3 Halse Combe - both SS893455 CW 23 sides of stream 01/06/2020 Hanny Combe SS915418 PC / JS 13.00 26 100% 1 22 28/05/2020 Hanny Combe SS915418 SP 14.30 2 31 15/06/2020 16 80 2 3.87 Hanny Combe SS915418 CW 58 31/05/2020 Hawkcombe Woods SS861457 02/06/2020 MW 24 100% 1 23 30 46 Hopcott Common & SS953442 & No survey Perriton Combe SS952443 (recorded as one) Horner Wood SS888445 Edge/Horner Gate 28/05/2020 PC 26 100 1 29 35 49.71 Horner Wood SS888443 Edge/Horner Gate/Ley Hill 01/06/2020 CW 34 Luccome Hill (Hollow SS904436 MO 12.30 26 100% 1 10 15 Girt) and SS909435 28/05/2020 40 Mansley Combe SS906405 28/05/2020 MO 16.00 24 100 1 12 Mansley Combe area, west of Dunkery Bridge SS895408 28/05/2020 MO 15.15 24 100 1 12 Nutscale Reservoir SS858433 02/06/2020 PC / JS 10 72 4.16 Rey Combe SS892451 28/05/2020 MO 11.50 26 100% 1 5 15 20 Shillett Combe SS858460 02/06/2020 MW 24 100% 1 0 15 0 Spangate SS917414 15/06/2020 SP 15.30 16 10% 2 0 40 0 Sweetworthy Combe SS884423 02/06/2020 PC / JS 33 36 55 Sweetworthy Combe SS884423 02/06/2020 MW 24 100% 1 44 30 88 Webber's Post/Dunkery SS904428 01/06/2020 DL 6 Beacon Chris ExmoorCW Heath FritillaryWiltshire timed count data 2020 DL Dave Land JP Jenny Plackett JS Jack Siviter MP Michael Prior PC Paul Camp MW Martin Warren SP Simon Phelps MO Matthew Oates

Appendix 4: Exmoor Heath Fritillary cont.

Holnicote Estate Heath Fritillary timed count data 2010-2020

Grabbist Ridge Heath Fritillary timed count data 2004-2020

No count

Haddon Hill Heath Fritillary timed count data 2010-2020

Appendix 5: Pearl-bordered Fritillary

Duration of searchDuration of

Mean % sunshine % sunshine Mean

temperature

Wind speed Wind speed

Confirmed

(code)

Mean Mean

Site Name Grid Ref. Date Pearl-bordered Fritillary Aish Tor SX705705 15/04/2020 10 Pearl-bordered Fritillary Aish Tor SX705705 23/04/2020 61 40 Pearl-bordered Fritillary Aish Tor SX705705 07/05/2020 44 40 Pearl-bordered Fritillary Chudleigh Knighton heath SX834775 02/05/2020 14 100 3 3 11 Pearl-bordered Fritillary Chudleigh Knighton heath SX834775 06/05/2020 14 100 4 4 12 Pearl-bordered Fritillary Chudleigh Knighton heath SX834775 22/05/2020 1 9 Pearl-bordered Fritillary Chudleigh Knighton heath SX834776 06/05/2020 19 70 4 4 8 Pearl-bordered Fritillary Fingle Woods - Cod Wood SX786887 02/05/2020 8 Pearl-bordered Fritillary Haldon Forest - Upper & Middle Kiddens SX872847 21/04/2020 8 Pearl-bordered Fritillary Haldon Forest - Upper & Middle Kiddens SX872847 22/04/2020 16 30 Pearl-bordered Fritillary Haldon Forest - Upper & Middle Kiddens SX872847 28/04/2020 24 25 Pearl-bordered Fritillary Haldon Forest - Middle Kiddens SX872847 29/04/2020 29 10 Pearl-bordered Fritillary Haldon Forest - Upper Kiddens SX872850 29/04/2020 18 15 Pearl-bordered Fritillary Hembury Fort SX726695 24/04/2020 2 Pearl-bordered Fritillary Lustleigh Cleave whole site SX759823 21/04/2020 2 Pearl-bordered Fritillary Lustleigh Cleave whole site SX759823 22/04/2020 10 Pearl-bordered Fritillary Lustleigh Cleave whole site SX759823 02/05/2020 60 Pearl-bordered Fritillary Lydford FE land - several patches SX492837 15/04/2020 30 Pearl-bordered Fritillary Mardon Down SX766871 18/05/2020 1 Pearl-bordered Fritillary Mardon Down SX762874 02/05/2020 1 Pearl-bordered Fritillary North Wood SX867886 19/04/2020 2 Pearl-bordered Fritillary North Wood SX868886 22/04/2020 11 38 Pearl-bordered Fritillary North Wood SX868886 24/04/2020 26 55 Pearl-bordered Fritillary Ramshorn Down SX791742 16/04/2020 2 Pearl-bordered Fritillary Timridge Brake - Nr Widecombe Copse SX857882 24/04/2020 15 45 Pearl-bordered Fritillary Trendlebere Down combe SX775794 22/04/2020 5 90 Pearl-bordered Fritillary Venford Brook SX689716 01/05/2020 4 Pearl-bordered Fritillary Walkham Valley - Berra Tor a SX477691 14/05/2020 16 100 3 3 30 Pearl-bordered Fritillary Walkham Valley - Berra Tor b SX475696 14/05/2020 16 100 1 5 45 Pearl-bordered Fritillary Walkham Valley - Bucktor SX477696 14/05/2020 16 100 3 0 30 Pearl-bordered Fritillary Walkham Valley - North Roborough Down SX502699 14/05/2020 15 100 3 0 20 Pearl-bordered Fritillary Yarner Drive SX787789 21/04/2020 10 15 Pearl-bordered Fritillary data timed count 2020

Appendix 5: Pearl-bordered Fritillary cont.

Dart Valley Pearl-bordered Fritillary timed count results 2010-2020

Haldon Forest Estate Pearl-bordered Fritillary timed count results 2014-2020

Walkham Valley Pearl-bordered Fritillary timed count results 2010-2020 14

Appendix 6: Dartmoor Small Pearl-bordered Fritillary

temperature

Wind speed speed Wind

Duration of Duration

Confirmed

sunshine sunshine

Mean % % Mean

(code)

Mean Mean

Site Name Grid Ref. Date Small Pearl-bordered Fritillary Common Wood SX527798 20/05/2020 20 100 3 15 38 Small Pearl-bordered Fritillary Drywell SX695751 25/05/2020 22 100 3 5 35 Small Pearl-bordered Fritillary East Shallowford SX693758 25/05/2020 22 100% 3 17 80 Small Pearl-bordered Fritillary East Shallowford SX693758 06/09/2020 16 60 3 20 75 Small Pearl-bordered Fritillary Mardon Down SX766871 18/05/2020 33 60 Small Pearl-bordered Fritillary Mardon Down SX773880 25/05/2020 5 Small Pearl-bordered Fritillary Pixie's Moor, South Zeal SX647928 20/06/2020 2 Small Pearl-bordered Fritillary Skaigh SX 637940 23/05/2020 6 Small Pearl-bordered Fritillary Walkham Valley - Bucktor SX477696 14/05/2020 16 100 3 6 30 Small Pearl-bordered Fritillary Walkham Valley - Bucktor/Berra Tor SX477694 14/05/2020 15 100 3 5 30 Small Pearl-bordered Fritillary Walkham Valley - Berra Tor a SX477691 14/05/2020 16 100 3 22 30 Small Pearl-bordered Fritillary Walkham Valley - Berra Tor b SX475696 14/05/2020 16 100 1 18 45 Small Pearl-bordered Fritillary Walkham Valley - Bucktor SX477696 14/05/2020 16 100 3 6 30 Small Pearl-bordered Fritillary Walkham Valley - North Roborough Down SX502699 14/05/2020 15 100 3 12 20 Small Pearl-bordered Fritillary Walkham Valley - nr Yelverton SX514688 20/05/2020 1 Small Pearl-bordered Fritillary Whitchurch Common SX507742 09/06/2020 1

Dartmoor Small Pearl-bordered Fritillary timed count data 2020

Appendix 7: Exmoor Small Pearl-bordered Fritillary

Wind speed (code) Wind speed

Duration of search

Mean Mean temperature

Mean % sunshine Mean % sunshine

Confirmed

Species Site Name Grid Ref. Date SPBF King's Lane Slope SS659482 30/05/2020 22 100 1 3 40 SPBF Mill Farm/Kittitoe SS660469 30/05/2020 22 100 1 6 40 SPBF Ladies Mile main slopeSS641477 30/05/2020 22 100 1 5 25 SPBF Trentishoe Combe SS649483 30/05/2020 22 100 1 22 40 SPBF Tarr Steps SS861326 21/05/2020 1 SPBF High Molland SS703345 30/05/2020 30 SPBF Bin Combe SS905410 28/05/2020 26 100 1 3 75 SPBF Mansley Combe SS906405 28/05/2020 24 100 1 12

Exmoor Small Pearl-bordered Fritillary timed count data 2020