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The Marine Life Information Network® for Britain and Ireland (Marlin) The Marine Life Information Network® for Britain and Ireland (MarLIN) Assessment of the Potential Impacts of Coasteering on Rocky Intertidal Habitats in Wales Report to Cyngor Cefn Gwlad Cymru / Countryside Council for Wales Contract no. NWR012 Dr Harvey Tyler-Walters FINAL REPORT March 2005 Reference: Tyler-Walters, H., 2005. Assessment of the Potential Impacts of Coasteering on Rocky Intertidal Habitats in Wales. Report to Cyngor Cefn Gwlad Cymru / Countryside Council for Wales from the Marine Life Information Network (MarLIN). Marine Biological Association of the UK, Plymouth. [CCW Contract no. NWR012] Assessment of the potential impacts of coasteering in Wales MarLIN 2 Assessment of the potential impacts of coasteering in Wales MarLIN The Marine Life Information Network® for Britain and Ireland (MarLIN) Assessment of the Potential Impacts of Coasteering on Rocky Intertidal Habitats in Wales Contents CONTRACT SPECIFICATION ..............................................................................................4 EXECUTIVE SUMMARY .......................................................................................................7 1. AIMS AND TIMETABLE...............................................................................................11 2. METHODOLOGY..........................................................................................................11 2.1. LITERATURE REVIEW .................................................................................................11 2.2. IDENTIFICATION OF POTENTIALLY VULNERABLE BIOTOPES............................................12 2.3. SENSITIVITY ASSESSMENT.........................................................................................12 3. RESULTS OF THE LITERATURE REVIEW................................................................13 3.1. THE POTENTIAL EFFECTS OF COASTEERING IN THE ROCKY SHORES..............................14 3.2. NATURE OF THE INFORMATION...................................................................................16 3.3. THE EFFECTS OF TRAMPLING ON INTERTIDAL ROCKY SHORE COMMUNITIES...................16 3.3.1. Brown algal shrubs.............................................................................................16 3.3.2. Algal turfs............................................................................................................21 3.3.3. Coralline algal turfs.............................................................................................22 3.3.4. Barnacle zone ....................................................................................................23 3.3.5. Mussel beds .......................................................................................................23 3.3.6. Sabellariid worms ...............................................................................................24 3.3.7. Shallow infralittoral algal communities ...............................................................25 3.3.8. Limpets and other gastropod grazers ................................................................25 3.3.9. Bare space .........................................................................................................26 3.4. FACTORS INFLUENCING THE EFFECTS OF TRAMPLING ..................................................26 4. IDENTIFICATION OF VULNERABLE OR AT RISK COMMUNITIES AND SPECIES26 4.1. POTENTIALLY VULNERABLE ROCKY INTERTIDAL COMMUNITIES......................................27 4.2. OTHER POTENTIALLY VULNERABLE COMMUNITIES .......................................................28 4.3. POTENTIALLY VULNERABLE IMPORTANT BIOTOPES ......................................................32 4.4. POTENTIALLY VULNERABLE IMPORTANT SPECIES ........................................................32 4.5. POTENTIALLY VULNERABLE AREAS OF THE COAST.......................................................32 5. DISCUSSION ................................................................................................................38 6. CONCLUSIONS............................................................................................................40 7. RECOMMENDATIONS.................................................................................................41 8. REFERENCES..............................................................................................................42 3 Assessment of the potential impacts of coasteering in Wales MarLIN Contract specification The relatively new recreational pursuit of Coasteering, which has developed in the St David’s area of Pembrokeshire, appears to be expanding rapidly. The majority of local commercial recreation providers (outdoor pursuit centers etc) now appear to offer this pursuit. Coasteering has expanded out of St David’s to other suitable cliff coastlines round Pembrokeshire. The majority of the rocky coastlines where it takes place lie within Pembrokeshire Marine Species Area of Conservation (SAC), and are also Sites of Special Scientific Interest (SSSI). No assessment has yet been undertaken of coasteering’s potential impact on the intertidal habitats. The contract specified a study of previous research/work into the impacts of physical disturbance through trampling / coasteering on rocky intertidal habitats, in particular work that may enable the following queries to be answered. • What are the high risk communities? • What are the vulnerable species? Are any of these important to the SAC / SSSI? • Where are the high risk areas of coast? Do theses coincide with likely trampling / coasteering activities – i.e. where are the management priorities? • Is there any similar research done related to climbing activities? • Is there any difference in impacts on different shore types, both in terms of exposure and rock types? 4 Assessment of the potential impacts of coasteering in Wales MarLIN List of Figures Figure 1. Sites within west Wales were coasteering is known to occur (Green et al., in prep)...............................................................................................................................13 List of Tables Table 1. Summary of characteristics of studies cited. The type of habitat and degree of wave exposure are expressed as described in the papers cited. (?) = wave exposure was not indicated and has been inferred from the communities present. ? = characteristic unknown. .................................................................................................17 Table 2. Potentially vulnerable rocky intertidal biotopes (or that represent biotopes) that occur in the vicinity of sites subject to coasteering in west Wales. The intolerance of potentially vulnerable communities is emboldened, and particularly vulnerable communities are shaded................................................................................................29 Table 3. The marine natural heritage importance of researched (and their representative) biotopes in the vicinity of coasteering sites in west Wales. UK BAP = UK Biodiversity Action Plan. Reefs, caves, sandflats, sandbanks, bays, estuaries and lagoons refer to the relevant Annex I habitats of the Habitats Directive. Potentially vulnerable biotopes are emboldened and particularly vulnerable communities are shaded.........................33 Table 4. Welsh species of conservation concern that occur within the rocky intertidal or sublittoral fringe of Pembrokeshire marine SAC (Moore, 2002)....................................38 List of Appendices Appendix 1. List of phase I biotopes within 0.5 km radius of sites subject to Coasteering activities in west Wales..................................................................................................51 Appendix 2. Sensitivity assessment rationale - a summary ..............................................69 Appendix 3. Guide to the interpretation of sensitivity assessments and the benchmarks used. ..............................................................................................................................81 Appendix 4. Sensitivities of researched biotopes in the vicinity of Coasteering activities in west Wales.....................................................................................................................85 Appendix 5. Recovery potential of researched biotopes in the vicinity of Coasteering activities in west Wales................................................................................................105 Appendix 6. List of represented and representative biotopes (see text). Researched biotopes are shown in bold..........................................................................................125 5 Assessment of the potential impacts of coasteering in Wales MarLIN 6 Assessment of the potential impacts of coasteering in Wales MarLIN The Marine Life Information Network® for Britain and Ireland (MarLIN) Assessment of the Potential Impacts of Coasteering on Rocky Intertidal Habitats in Wales Executive summary The relatively new recreational pursuit of Coasteering, which has developed in the St David’s area of Pembrokeshire, appears to be expanding rapidly. The majority of local commercial recreation providers (outdoor pursuit centers etc.) now appear to offer this pursuit. The majority of the rocky coastlines where it takes place lie within Pembrokeshire Marine Special Area of Conservation (SAC), and are also Sites of Special Scientific Interest (SSSI). No assessment has yet been undertaken of coasteering’s potential impact on the intertidal
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