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South Wales Fanshell Survey CCW Species Challenge Fund Report No. 03/01/04 2003 CCW SPECIES CHALLENGE FUND MARINE PROJECTS South Wales Seasearch and Fan Shell Survey June − August 2003. by Chris Wood, Marine Conservation Society CCW Grant No: SC7702 CCW SCF Report 03/01/04 h ko Wiiîi .o oU South Wales Seasearch and Fan Shell survey 2003 Report II II South Wales Seasearch and Fan Shell Survey II June − August 2003 A report to the Countryside Council for Wales by !1 Chris Wood Ii II MARINE CONSERVATION SOCIET Y II South Wales Seasearch and Fan Shell Survey 2003 I I Seasearch I Seasearch is a volunteer underwater survey project for recreational divers to record observations of marine habitats and the life they support. The information gathered is I used to increase our knowledge of the marine environment and contribute towards its I conservation. Seasearch is co−ordinated nationally by a Steering Group led by the Marine Conservation Society and including representatives from statutory conservation bodies (Countryside Council for Wales, English Nature and Scottish Natural Heritage), the Environment Agency, the Wildlife Trusts, the Marine Biological I Association (MarLIN), diver training organisations (PADI, SAA, BSAC and SSAC), Nautical Archaeological Society and independent marine life experts. Seasearch is I financially supported by the Heritage Lottery Fund and many of the steering group members. Divers can participate in Seasearch training days with an introduction to I marine habitat and species identification and survey methods. Seasearch surveys are organised during the diving season and involve making underwater observations I and completing forms. For information: survey more I The objectives for the national Seasearch programme are to: • Gather information on UK seabed habitats and associated wildlife through I participation of SCUBA divers I • Provide standardised training to enable SCUBA divers to participate in Seasearch • Ensure the quality of data gathered • Make available the data collected through Seasearch • Raise awareness of the diversity of UK marine life and its environment through participation of SCUBA divers and dissemination of information. The Fan she|| Atrina fragilis The Fan shell Atrina fragilis, also known as Fan mussel, is a UK Biodiversity Action Plan Species. However, there are no records for A. fragilis on the Marine Nature I Conservation Review database and there is almost no information concerning the population status of A. fragilis within the UK. It has been suggested that the I populations of A. fragilis around the UK and Ireland have declined since the turn of the century due to the impacts of demersal fishing activities and, in some areas, sand I and gravel extraction. It is possible that direct removal by collectors may have contributed to the apparent decline. I I There are historic records of specimens from Carmarthen Bay and Milford Haven. The Marine Conservation Society The Marine Conservation Society (MCS) is the UK Charity dedicated to the I protection of the marine environment and its wildlife. Since its formation in 1983, MCS has become a recognised authority on marine and coastal conservation and is I regularly consulted by Government for its views on a range of marine issues including fishing. MCS provides information and guidance on many aspects of marine I conservation and produces the annual Good Beach Guide, as well as promoting public participation in volunteer projects and surveys such as Adopt−a−Beach, I Seasearch and Basking Shark Watch. The MCS is the Lead Partner for the Atrina fragilis Species Action Plan. The surveys reported here were carried out by members of the MCS as a part of the I MCS Member's Dives Programme. I Marine Conservation Society, Unit 3, Wolf Business Park, Alton Road, Ross−on−Wye, Herefordshire, HR9 5NB. Tel: 01989 566017, Website www.mcsuk.org I I South Wales Seasearch and Fan Shell Survey 2003 an W R Table of Contents an Synopsis Introduction 5 8 1.1 The Fan shell, Atrina fragilis 5 1.2 The Study Areas 6 R Methods 6 2.1 Participants 6 2.2 Organising and Undertaking Seasearch Dives 7 2.3 Data analysis and Quality Control 7 3 Results 9 3.1 Site 1: Carmarthen Bay, Atrina fragilis record site 9 3.2 Site 2: Woolhouse Rocks, Tenby 10 i 3.3 Site 3: Man of War Roads and Spaniel Shoal 11 3.4 Site 4: The Yowan, Tenby 12 3.5 Site 5: Stack Rock, Milford Haven 14 3.6 Site 6: Chapel Bay, Milford Haven 17 3.7 Site 7: South of Sheep Island 18 3.8 Site 8: South Haven, Skomer 19 4 Discussion 21 4.1 The occurrence of Atrina fragilis 21 4.2 Observation and feature of interest from Seasearch records 22 8 5 References 25 i 6 Acknowledgements 25 IN Appendix 1 Dive positions and details 26 Appendix 2 Species List 29 n Appendix 3 Recording forms 39 am Cover Photographs Top Left Common mussels at Woolhouse Rocks, Tenby (photo Chris Wood) Top right Horseshoe worm, Phoronis hippocrepia, (Photo Jon Moore) in Mid left Angular Crab Goneplax rhomboides, Stack Rock, Milford Haven n (photo Chris Wood Mid right Burrowing anemone Mesacmaea mitchellii, Skomer (Photo Chris ND Wood) Bottom left Nudibranchs, Doto pinnatifida on the Sea beard Nemertesia antennia (photo Jon Moore) Bottom right Cephalopod eggs on a razor shell, Carmarthen Bay (photo Jon Moore) Chart extracts throughout this report are reproduced from Admiralty Charts 1482, 2878 & 3274 by permission of the Controller of Her Majesty's Stationery Office and the UK Hydrographic Office (www.ukho gov uk). They are not to be used for navigation am South Wales Seasearch and Fan Shell Survey 2003 nn Be m Synopsis Re This report summarises the findings of Seasearch survey dives carried out by volunteer recorders from the Marine Conservation Society in Carmarthen Bay, Milford Haven and NI South Haven, Skomer during June and August 2003. BB The prime purpose of the survey was to look at sites where the fan shell Atrina fragilis n had been recorded in the past and to try to identify the current status of the species in Wales. Atrina is a UK Biodiversity Action Plan species and the surveys were partially m funded by the Countryside Council of Wales' Species Challenge Fund. Ri Suitable sediment habitats for the species were found in all three areas but no living specimens were recorded. The only record of the species was of a single shell found Rn amongst shell debris in Milford Haven. The shell appeared to be recent and it is possible that fan shells do still occur in Milford Haven. If so they are likely to be in soft sediments E close to or within the shipping channel. W The Seasearch surveys enabled records to be made of a number of sites in Carmarthen Bay for which there are no previous MNCR records. The sediment sites were very varied RN with some quite rich in fauna, including bivalve molluscs, whilst others were relatively barren. The rocky habitats in Carmarthen Bay were all of low−lying limestone and were n characterised by the large numbers of edible mussels and hydroids, with associated life. Both Milford Haven and South Haven, Skomer are sites which have been visited before. n However a number of the records are quite old and some of the sites were new. In Milford Haven sediment habitats predominated though these were much more varied m than those in Carmarthen Bay. an Rocky sites just outside Milford Haven south of Sheep Island and the rocky margins at South Haven, Skomer were also investigated. These sites provided a number of records BI of nationally scarce species, though none of them are new to the area as a whole. Bm m Bi n u B IN n in RB Reference: Wood. C, (2003). South Wales Seasearch and Fan Shell Survey; June− August 2003. A report to the Countryside Council for Wales. Marine Conservation Bm Society, Unit 3, Wolf Business Park, Alton Road, Ross−on−Wye, Herefordshire, HR9 5NB. n m South Wales Seasearch and Fan Shell Survey 2003 n im E 1 Introduction This report summarises the findings of Seasearch survey dives carried out in Carmarthen InN Bay, Milford Haven and South Haven Skomer during June and August 2003. n 1.1 The Fan Shell, Atrina fragilis E This large mollusc is a Nationally Scarce species in the UK, is listed for Protection in the aN Wildlife and Countryside Act 1981 and is a UK Biodiversity Action Plan Species. The Action Plan for Atrina fragilis (JNCC/UK Biodiversity Website) identifies the lack of information about the current population status of the species as follows: "There is almost no information concerning the population status of A. fragilis within the UK. " R The Marine Conservation Society has instigated a national awareness exercise targeting both divers and boat users in an attempt to identify locations where fan shells are currently found. As a part of this activity specific surveys have been organised in locations where there are previous records. These are The Oberon Bank, W Scotland, the current surveys in South Wales and Plyrnouth Sound. E Information on past records of Atrina fragilis in Wales has been obtained from Moore (2002). This identifies two records in south Wales, from Carmarthen Bay in 1899 and from Stack Rock, Milford Haven in 1960. In addition to this the awareness raising exercise gave rise to an unconfirmed sighting of the fan shell in South Haven, Skomer, approximately 20 years ago (Francis Bunker, pers. Comm.). i The survey therefore concentrated on these three areas. i 1.2 The Study Areas n Carmarthen Bay is a wide open south−facing bay bounded by Caldey Island and Tenby in the west and the Gower Peninsular in the east.
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