Marine Mammal & Marine Turtle Strandings
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www.strandings.com Marine Mammal & Marine Turtle Strandings (Welsh Coast) Annual Report 2007 R.S.Penrose. February 2008 Marine Environmental Monitoring Penwalk Llechryd Cardigan Ceredigion West Wales SA43 2PS e-mail: [email protected] 1 REPORT DISTRIBUTION. British Divers Marine Life Rescue. J. Barnett P. Lewis Carmarthen Bay & Estuaries European Marine Site. B. Bullimore Centre for Environment, Fisheries & Aquaculture Science. R. J. Law Countryside Council for Wales. Dr A. McMath T. Stringell R. Pratt Dyfed Powys Police (Wildlife Unit) A. Mason Environment Agency. K. Cameron Local Authorities. Anglesey G. Loe Bridgend S. Moon Cardiff P. Gillard Carmarthenshire E. Waters Ceredigion B. Jones Conwy T. Mead Denbighshire M. Bud Flintshire R. Hebdon Gwynedd B. Davies Neath Port Talbot A. Lewis Pembrokeshire A. Woods Swansea C. Morgan Vale of Glamorgan K. Pryor Marine Aware North Wales. Nia Jones Maritime & Coastguard Agency. Swansea E. Birkett Milford Haven A. Turnbull Holyhead J. Paton Natural History Museum. Dr R. Bamber R. Sabin E. Evans Pembrokeshire Coast National Park. J. Hodges RSPCA R. de Kerckhove Snowdonia National Park Authority. R. Gritten SAC Officers. Ceredigion Pembrokeshire S. Burton Pen Llyn A. Hargrave The Wildlife Trusts. F. Catternach Dr M. Havard 2 University College Cork. Dr E. Rogan University of Liverpool. Dr J.R. Baker Dr J. Chantry WDCS M. Simmonds Welsh Assembly Government. Dr H. Prosser V. Paris J. Thomas Welsh Marine Life Rescue. T. Leadbetter Zoological Society of London. Dr P. Jepson R. Deaville Others : Jemma & Ray Lerwill Sal Shipley Jan Loveridge CWT Lindy Hingley 3 CONTENTS Page 1 EXECUTIVE SUMMARY 6 2 INTRODUCTION 8 2.1 Changes to Project 2006 8 2.2 Further changes to the Project 2007 9 3 MATERIALS AND METHODS 9 3.1 Live Animals. 10 3.2 Dead Animals. 10 4 RESULTS 11 4.1 Marine Mammals. 11 4.2 Bottlenose Dolphin Attacks. 15 4.3 Unusual Occurrences. 16 4.4 Live Strandings. 21 4.5 Tagging. 23 5 OTHER MARINE ANIMALS REPORTED TO THE NETWORK 24 5.1 Marine Turtles. 24 5.2 Sharks. 25 6 SAMPLES 26 7 FUNDING 26 8 PUBLICITY 26 9 LEGISLATION 27 10 EQUIPMENT 27 11 TRAVEL 27 12 ADMINISTRATION 27 13 CAUSE OF DEATH 28 14 LIST OF SCIENTIFIC NAMES USED IN THIS REPORT 29 15 ACKNOWLEDGEMENTS 29 16 APPENDICES 29 4 List of Figures. page Figure 1. Current Technical Co-ordination of the Cetacean Strandings Investigation Programme (CSIP). 8 Figure 2. Coastline designations currently used on the project. 9 Figure 3. Reported harbour porpoise strandings on the Welsh coast. 13 Figure 4. Harbour porpoise strandings by month. 13 Figure 5. Reported grey seal mortality on the Welsh coast. 14 Figure 6. Grey seal mortality by month. 14 Figure 7. Stranding locations of the 14 porpoises killed by bottlenose dolphins in 2007. 15 List of Plates. Plate 1. Minke whale calf SW2007/067 the following day. 16 Plate 2. Dr John Baker examining the carcass at the stranding location 16 Plate 3. SW2007/109 showing boat propeller cuts? in blubber. 17 Plate 4. Bottlenose dolphin SW2007/169 being winched up the beach to the awaiting trailer. 17 Plate 5. Unidentified beaked whale SW2007/188b at Aberporth. 18 Plate 6. The remains of SW2007/188b being removed from the public beach at Aberporth. 18 Plate 7. Striped dolphin SW2007/192 showing rope marks. 19 Plate 8. Bottlenose dolphin SW2007/215 showing worn teeth. 19 Plate 9. Humpback whale SW2007/239 at Aberavon, Port Talbot. 20 Plate 10. The start of the examination process of the humpback. 21 Plate 11. White-sided dolphin SW2007/227. 22 Plate 12. Current tags supplied to groups on the Welsh coast. 23 Plate 13. Remains of the tiny loggerhead turtle T2007/004. 24 Plate 14. Loggerhead turtle T2007/006 at ZSL. 24 Plate 15. The remains of T2007/020 at Newgale beach. 25 Plate 16. BBCTV 'Saving Planet Earth' at Kew Gardens. 26 List of Tables. Table 1. Wales and west coast of England. 9 Table 2. 2007 Total number of reported marine mammal strandings (Welsh Coast). 11 Table 3. 2007 Number of live cetacean strandings (Welsh Coast). 11 Table 4. 2007 Number of animals suitable for post-mortem examination. 12 Table 5. 2007 Number of animals decomposed/disposed of. (Welsh Coast). 12 Table 6. Cause of death. 28 Table 7. List of scientific names used in this report. 29 5 1. CRYNODEB GWEITHREDOL Mae'r cynllun wedi'i ail-enwi'n UK Cetacean Strandings Investigation Programme (CSIP - rhaglen y DU ar gyfer ymchwilio tiriadau anifeiliaid o deulu'r morfil) a bellach Cymdeithas Sŵolegol Llundain (ZSL) sy'n ei gydlynu'n dechnegol. Yn dilyn gostyngiad yn yr arian ar gyfer y cynllun yn 2006, daeth newidiadau pellach sy'n gwahardd casglu rhagor na chyfanswm o 100 carcas y flwyddyn ar gyfer archwiliad post-mortem. Dyma ddyraniad o ryw 20 carcas o Gymru. Pryder yr awdur yw yr arweinia'r newidiadau hyn yn y fethodoleg at ddryswch a digalondid ymhlith y rhwydwaith o wirfoddolwyr sy'n hysbysu'r tiriadau. Ar ben hynny, gofynnwyd i'r CSIP ymchwilio tiriadau heulforgwn yn y DU. Teulu'r Morfil Derbyniodd MEM adroddiadau am 135 o anifeiliaid o deulu'r morfil. Llamhidyddion oedd y rhai y cafwyd y nifer uchaf o adroddiadau amdanynt, yn ogystal â nifer sylweddol o rywogaethau nas adnabuwyd oherwydd y newidiadau ym methodoleg y casglu a orfodwyd ar y cynllun. Unwaith eto, trwy gydol 2007, yr oedd modd cadarnhau bod rhai llamhidyddion wedi'u lladd gan ddolffiniaid trwyn potel. Bydd y ffaith na chafodd y cynllun wneud cymaint o gofnodi ers 2006 yn golygu anhawster wrth gymharu tueddiadau yn y gweithgaredd hwn â'r blynyddoedd cynt. Cafwyd adroddiadau ynghylch anifeiliaid eraill o deulu'r morfil wedi tirio ar lannau Cymru yn 2007, gan gynnwys dau ddolffin trwyn potel, un morfil pigfain banw, un dolffin rhesog, un morfil gylfinog (rhywogaeth anhysbys) a morfil cefngrwm gwryw ifanc. Daeth saith i'r lan yn fyw, sef: 5 llamhidydd, 1 morfil pigfain ac 1 dolffin ystlyswyn. Cafwyd bod trigain mewn cyflwr o bydredd ‘newydd gychwyn i gymedrol’ ac fe'u hystyriwyd felly'n addas i'w harchwilio post-mortem. Dewiswyd 28 o'r 60 i'w harchwilio. Yr oedd 71 o'r 135 anifail a diriodd wedi pydru, neu fe benderfynwyd peidio â'u harchwilio post- mortem; cysylltwyd â'r cyngor lleol perthnasol er mwyn cael gwared â'r gweddillion yn ddiogel. Yn achosion y gweddill, fe'u hadnabuwyd, ond am wahanol resymau nid oedd modd eu casglu na chael gwared ar eu cyrff. Morloi Derbyniodd MEM adroddiadau am 69 morlo llwyd. Bu'r nifer o adroddiadau ynghylch morloi yn debyg i'r disgwyl. Ni chasglwyd unrhyw garcasau i'w harchwilio post mortem. Crwbanod Cafwyd adroddiadau, o lannau Cymru, y gwelwyd 5 crwban byw a bod dau grwban môr cefn lledr marw wedi tirio. Cafwyd dau grwban môr pendew bach marw wedi tirio. Samplau Yn ogystal â'r samplau arferol a gymerwyd o anifeiliaid a gasglwyd ar gyfer archwiliad post-mortem, cymerwyd samplau hefyd o 28 o anifeiliaid eraill cyn cael gwared arnynt. Ariannu Dyrannodd Llywodraeth Cynulliad Cymru/Defra gytundeb tair blynedd a ddechreuodd ym mis Mawrth 2007. 6 1. EXECUTIVE SUMMARY The project has been renamed as the UK Cetacean Strandings Investigation Programme (CSIP) and is now under the technical co-ordintation of the Zoological Society of London (ZSL). Reduced project funding in 2006 has been followed by further changes permitting only 100 carcasses per year overall to be retrieved for post-mortem examination. This relates to approximatley 20 carcasses from Wales. The author is concerned that these changes in methodology may result in confusion and dispondency within the voluntary reporting network. Additionally the CSIP has been requested to investigate UK strandings of basking sharks. Cetaceans 135 cetaceans were reported to MEM in 2007. Harbour porpoises were the most frequently reported and a significant number of undetermined species owing to the changes in retrieval methodology imposed on the project. Harbour porpoise ‘killed by bottlenose dolphin’ were continued to be identified through 2007. Imposed reduced effort in recording from 2006 will make trends in this activity difficult to compare with previous years. Other cetaceans reported stranded on the Welsh coast in 2007 included two bottlenose dolphins, one female minke whale, one striped dolphin, one unidentified beaked whale and a juvenile male humpback whale. Seven cetaceans live-stranded being; 5 harbour porpoises, 1 minke whale and 1 white-sided dolphin. Sixty cetaceans were found to be in a state of ‘fresh to moderate’ decomposition and therefore considered to be suitable for post-mortem examination. Twenty-eight of the 60 were selected for examination. Seventy-one of the 135 cetacean strandings were decomposed or discarded for post-mortem examination and the relevant local council contacted for safe disposal of remains. The remaining cetaceans were confirmed but retrieval or disposal was not possible due to various reasons. Seals 69 grey seals were reported to MEM. Numbers of reported seals was as expected. No carcasses were retrieved for post-mortem examination. Turtles Five live sightings and two strandings of dead leatherback turtles were reported from around the Welsh coast. Two small loggerhead turtles were found stranded dead. Samples In addition to routine samples taken from animals recovered for post-mortem examination, samples have also been taken from 28 further animals before disposal. Funding A three year contract commencing March 2007 has been issued by WAG/Defra. 7 2. INTRODUCTION In 1990, the ‘Collaborative UK Marine Mammal Strandings Project’ was initiated and part-funded by the UK Department of the Environment (now Defra). The project involves detailed pathological and other investigations of stranded marine mammal carcasses (mostly cetacean) from UK waters.