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Cathkin Marsh Invertebrate Survey Report 2012

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Cathkin Marsh Invertebrate Survey Report 2012 SWT Cathkin Marsh: Invertebrate Survey Report 2012 Ref: CC0032/R1 25th March 2013 Prepared by: Chris Cathrine BSc(Hons) MIEEM FLS, Director Glenn Norris BSc(Hons), Assistant Ecologist Scott Shanks BSc(Hons) PhD, Associate Ecologist Louis Kitchen BSc(Hons), Associate Ecologist Suzanne Bairner MSc, Associate Ecologist Cale donian Conservation Ltd E: [email protected] T: 01698 457 553 M: 07789 77 11 66 A: Unit 6, Beckford Street Business Centre,i iiiii28 Beckford Street, Hamilton, ML3 0BT PHOTO: Northern arches (Apamea zeta) © Scott Shanks Scottish Wildlife Trust Cathkin Marsh Invertebrate Survey Report 2012 25th March 2013 Ref: CC0032 Caledonian Conservation Ltd Scottish Wildlife Trust Cathkin Marsh Invertebrate Survey Report 2012 Report prepared by Caledonian Conservation Ltd. Report content, figures and data © SWT 2013. 25th March 2013 Ref: CC0032 Caledonian Conservation Ltd Scottish Wildlife Trust Cathkin Marsh Invertebrate Survey Report 2012 25th March 2013 Ref: CC0032 Caledonian Conservation Ltd Scottish Wildlife Trust Cathkin Marsh Invertebrate Survey Report 2012 Contents Summary ................................................................................................................... 1 1 Introduction ......................................................................................................... 2 2 Methodology ....................................................................................................... 3 2.1 Aerial netting ............................................................................................... 3 2.2 Sweep netting ............................................................................................. 3 2.3 Pitfall trapping ............................................................................................. 3 2.4 Hand collecting ........................................................................................... 4 2.5 Light trapping .............................................................................................. 4 2.6 Freshwater sampling ................................................................................... 4 2.7 Site visits ..................................................................................................... 4 2.8 Laboratory Identification .............................................................................. 5 3 Results................................................................................................................ 6 3.1 2012 Terrestrial Survey Results .................................................................. 6 3.2 2012 Freshwater Survey Results .............................................................. 10 3.3 Survey Limitations ..................................................................................... 12 4 Discussion and Recommendations ................................................................... 13 4.1 Interpretation Notes for Selected Species ................................................. 13 4.1.1 Spiders (Aranae) ................................................................................ 13 4.1.2 Beetles (Coleoptera) .......................................................................... 14 4.1.3 Flies ................................................................................................... 17 4.1.4 True bugs (Hemiptera) ....................................................................... 18 4.1.5 Moths and butterflies .......................................................................... 20 4.1.6 Dragonflies and Damselflies (Odonata) .............................................. 25 4.1.7 Mayflies (Ephemeroptera) .................................................................. 25 4.1.8 Scorpion flies (Mecoptera) ................................................................. 25 4.1.9 Megaloptera (Alderflies) ..................................................................... 26 4.1.10 Stoneflies (Plecoptera) ....................................................................... 26 4.1.11 Caddisflies (Trichoptera) .................................................................... 26 4.1.12 Slugs and Snails (Stylommatophora) ................................................. 26 4.2 Habitat Management Recommendations .................................................. 27 References .............................................................................................................. 29 APPENDIX 1: Photographs .................................................................................... 33 APPENDIX 2: Terrestrial Invertebrate Records ...................................................... 45 APPENDIX 3: Freshwater Invertebrate Records .................................................... 59 APPENDIX 4: Figures ............................................................................................ 71 25th March 2013 Ref: CC0032 Caledonian Conservation Ltd Scottish Wildlife Trust Cathkin Marsh Invertebrate Survey Report 2012 25th March 2013 Ref: CC0032 Caledonian Conservation Ltd Scottish Wildlife Trust Cathkin Marsh Invertebrate Survey Report 2012 Summary Caledonian Conservation Ltd was commissioned by Scottish Wildlife Trust (SWT) to complete an invertebrate survey of the Cathkin Marsh reserve. The invertebrate survey field work used a variety of sampling techniques in order to collect a wide range of invertebrate taxa between March 2012 and December 2012. The reserve is approximately 11ha and is comprised of fen and marshy grassland with scattered willow scrub with several streams and created ponds throughout. The reserve is located amongst land heavily affected by human activity. In total, 201 species of invertebrate were recorded at the Cathkin Marsh reserve during the survey. A number of nationally notable and rare species of conservation concern were recorded, including the nationally notable (A) moth Northern arches (Apamea zeta) and the Scottish Biodiversity Listed species: Garden Tiger (Arctia caja). The current management regime is already benefiting invertebrates at Cathkin Marsh, and there are few further recommendations that can be made. Maintaining a range of high-quality aquatic habitats from open water to shallow seasonal pool scrapes would be beneficial for not just aquatic invertebrate species, but also other wildlife. During early visits to the reserve in March and April it was noticeable that apart from willow catkins, there were few early-flowering plants to provide nectar for pollinating insects. 25th March 2013 Ref: CC0032 1 Caledonian Conservation Ltd Scottish Wildlife Trust Cathkin Marsh Invertebrate Survey Report 2012 1 Introduction Caledonian Conservation Ltd was commissioned by Scottish Wildlife Trust (SWT) to complete an invertebrate survey of the Cathkin Marsh reserve in 2012, to include both terrestrial and freshwater groups. This report presents the results of these surveys and some observations on the species recorded. The reserve is approximately 11ha and is comprised of fen and marshy grassland with scattered willow scrub. The reserve is located between agricultural land to the south and west, a landfill site to the east and a golf course to the north. A ditched stream runs west to east across the reserve. It is joined by a tributary from the north near the middle of the site. A number of ponds have been created in the wetland. A hedge-lined access path leads from a car park approximately 200m to the main part of the reserve. Invertebrate survey and analysis was conducted by Chris Cathrine (Director), Dr Scott Shanks (Associate Ecologist) and Louis Kitchen (Associate Ecologist). Fieldwork assistance was provided by Steven Johnston (Assistant Ecologist) and Erik Paterson (Associate Ecologist). Additional species observations and identifications were provided by Glenn Norris (Assistant Ecologist) and Suzanne Bairner (Associate Ecologist). This report was prepared by Chris Cathrine, Glenn Norris, Dr Scott Shanks and Louis Kitchen. Mapping was undertaken using ArcGIS 10 and Google Maps, completed by Glenn Norris and Chris Cathrine. As well as presenting new information, this report draws upon data provided by SWT. Copyright of this report, figures and data belongs to SWT. 25th March 2013 Ref: CC0032 2 Caledonian Conservation Ltd Scottish Wildlife Trust Cathkin Marsh Invertebrate Survey Report 2012 2 Methodology SWT (Katrina Martin) specified that surveys were to be restricted to non-lethal methods only when the project was commissioned. However, lethal methods were later requested by SWT (Kim McEwan) on 3rd July 2012. Therefore, surveys completed prior to this date used non-lethal methods only, while later work was redesigned to incorporate lethal methods in order to maximise the value of the data collected. The following sections provide detail of the wide variety of invertebrate sampling methods employed. 2.1 Aerial netting A standard 40 cm diameter insect net was used to net any flying or resting insects that needed examination (referred to as field observations). There was no particular strategy involved other than looking for insects as the site was crossed, examining suitable patches of flower heads and sampling insect swarming. Any insects caught were transferred to a specimen tube for examination and if appropriate retained for identification. For some invertebrate groups including butterflies, observation at a distance with x8 magnification binoculars was sufficient for identification. 2.2 Sweep netting A 30 cm diameter canvas insect net
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