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Appendix 8.6 Aquatic Macroinvertebrate Surveys of the Bristol Avon at Conigre Mead and Challymead

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Appendix 8.6 Aquatic Macroinvertebrate Surveys of the Bristol Avon at Conigre Mead and Challymead Wilts & Berks Canal Trust Environmental Statement Melksham Link canal Appendix 8.6 APPENDIX 8.6 AQUATIC MACROINVERTEBRATE SURVEYS OF THE BRISTOL AVON AT CONIGRE MEAD AND CHALLYMEAD WBCT/NPA/10653 NICHOLAS PEARSON ASSOCIATES Wilts & Berks Canal Trust Environmental Statement Melksham Link canal Appendix 8.6 WBCT/NPA/10653 NICHOLAS PEARSON ASSOCIATES Aquatic macroinvertebrate surveys of the Bristol Avon at Conigre Mead and Challymead, Melksham. A survey report by Jon Mellings for Wilts and Berks Canal Trust, 7th May 2015 0 Contents Summary ........................................................................................................................................................................... 2 Introduction ...................................................................................................................................................................... 2 Aims and objectives .......................................................................................................................................................... 3 Objectives.......................................................................................................................................................................... 3 Methods ............................................................................................................................................................................ 3 Review of historic records ............................................................................................................................................. 3 Fieldwork ....................................................................................................................................................................... 3 1. Sample sites ................................................................................................................................................. 3 2. Habitat ......................................................................................................................................................... 4 3. Sampling method ......................................................................................................................................... 4 4. Washing, sorting and identification of samples ........................................................................................... 4 Data analysis ................................................................................................................................................................. 4 Results and Discussion ...................................................................................................................................................... 4 Historic records ............................................................................................................................................................. 4 2015 findings ................................................................................................................................................................. 5 5. Habitat ......................................................................................................................................................... 5 6. Macroinvertebrate samples ......................................................................................................................... 6 7. Analysis of samples using Biological Monitoring Working Party (BMWP), Average Score Per Taxon (ASPT) and Community Conservation Index (CCI) scores. ....................................................................................... 8 Evaluation ......................................................................................................................................................................... 9 Habitat and species ....................................................................................................................................................... 9 Survey limitations ....................................................................................................................................................... 10 Survey Conclusions ..................................................................................................................................................... 11 Summary of potential impacts .................................................................................................................................... 11 Recommendations .......................................................................................................................................................... 12 References ...................................................................................................................................................................... 14 Appendices ...................................................................................................................................................................... 15 Appendix 1 - Tables ..................................................................................................................................................... 15 Appendix 2 – Figures ................................................................................................................................................... 28 Appendix 3– Photographs ........................................................................................................................................... 29 1 Summary Freshwater macroinvertebrate surveys were undertaken using standard methods at two sample sites within the Bristol Avon at Melksham, Wiltshire on the 8th April, 2015. The aim of the survey was to inform a planning proposal by the Wilts and Berks Canal Trust to provide a navigable waterway linking the Kennet & Avon Canal at Semington to the river Avon north of Melksham. The scheme proposes the use of a section of the Bristol Avon, currently not used as a navigable waterway. Two aquatic macroinvertebrate samples were collected at each sample point, namely adjacent to Conigre Mead a non-statutory nature reserve managed by the Wiltshire Wildlife Trust and downstream at Challymead, at a site located south of a proposed weir at the southwest extremity of the proposed navigable section. In summary both Conigre Mead and Challymead samples were found to support macroinvertebrate samples of ‘Fairly high conservation value’ according to Chadd and Extence (2004) protocol; however, this was based more on species diversity than on rarity of individual species. The recorded habitat and associated macroinvertebrate fauna was characteristic of the Bristol Avon within lowland Wiltshire of a type encompassed within the ‘Rivers, streams and associated habitat’ category defined within the Wiltshire LBAP. Whilst no specimens were recorded during the survey, the habitat was found to be suitable to support breeding populations of Scarce Chaser Libellula fulva, which has been historically recorded within the survey area. Whilst a range of aquatic molluscs were recorded from the four samples, Little Whirlpool Ramshorn Anisus vorticulus was not recorded during the survey. This European protected species had formerly been recorded at Conigre Mead Wiltshire Wildlife Trust Reserve; however, it is generally associated with grazing marsh ponds and ditches rather than rivers; therefore its occurrence is more likely to have been found within the ponds at Conigre Mead, or nearby ditches than from the river itself. A key finding of the survey was the diversity of bottom dwelling caddisfly larvae which require flowing water in which to capture their prey. Whilst no species of especially high rarity value were recorded, significant alterations in flow due to engineering works could impact these and similar species significantly, therefore impacting upon the diversity value of the existing sections. The report highlights potential impacts likely to result during construction and post-construction operation of the proposed waterway and suggests potential outline recommendations to minimise impact on the site’s macroinvertebrate fauna. As a minimum, the instigation and management of marginal habitat zones and their subsequent management, as well as measures to safeguard habitat downstream of the proposed development are recommended. Introduction In September 2012, Wilts and Berks Canal Trust submitted a full application for the development of 3.8 km of new waterway running from the Kennet & Avon Canal at Semington to the river Avon north of Melksham. It is understood that the proposed waterway would comprise 3.1 km of new canal plus a 0.7km stretch of the river through the town centre. To enable navigation by boat traffic it is necessary for the summer water level on the stretch to be raised by 0.5m and construction of a small weir at the junction between the River Avon and the Canal has been proposed to facilitate this increase. Following submission of the planning application, an objection was raised by the wardens of Conigre Mead Wiltshire Wildlife Trust (WWT) Reserve with reference to the potential impact on the riparian diversity of the reserve. Specific concerns relating to the potential impact on the dragonfly and damselfly fauna and other aquatic invertebrate assemblages supported by the stretch of the River Avon passing through the Conigre Mead Reserve and were cited. 2 In response to the application the County Ecologist and the Environment
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