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Grey Seal Pup Production for North Wales, 2002 Westcott, S1 & Stringell, T.B.2

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Grey Seal Pup Production for North Wales, 2002 Westcott, S1 & Stringell, T.B.2 Grey seal pup production for North Wales, 2002 Westcott, S.M. & Stringell, T.B. Marine Monitoring Report No: 5 This is a report of research commissioned by the Countryside Council for Wales. The Council has a programme of research in scientific and other areas, which supports the development of policies and practical work and helps point the way to new countryside legislation. However, the views and recommendations presented in this report are not necessarily those of the Council and should, therefore, not be attributed to the Countryside Council for Wales. No part of this report may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of the Countryside Council for Wales. Report Number: 5 Publication Date: September 2003 Contract Number: FC-73-02-183A Nominated Officer: T.B. Stringell Title: “Grey seal pup production for North Wales, 2002” Authors: Westcott, S.M. & Stringell, T.B. Series editor: W.G. Sanderson Restrictions: None Distribution List CCW: T. Stringell CCW HQ x5 S. Westcott x5 M.McMath, CCW HQ x1 M. Baines x1 B.Sanderson CCW HQ x1 S. Stansfield, Bardsey Bird Observatory x1 R. Holt, CCW HQ x1 A. Moralee, RSPB South Stack x1 L. Kay, CCW NWA x1 C. Sharpe, Manx Bird Atlas x1 Mike Camplin, CCW, H'FordW x1 T. Johnston, Exploris, Portaferry, NI x1 Blaise Bullimore, CCW H'fordW x1 E. Rogan, UC Cork x1 Paul Day, CCW NE x1 C. Liret, Oceanopolis, Brest, Brittany x1 Neil Smith, CCW NE x1 R. Penrose, Marine Env Monitoring x1 CCW HQ Library x1 Ivor Rees, Uni. Wales, Bangor x1 CCW NWA Library x1 John Gould, Uni Wales Bangor x1 CCW Cardiff Library x1 Peter Hope Jones x1 CCW Mold Library x1 David Mawer, IoS Wildlife Trust x1 CCW H’fordW x1 T. Nicholson, Cornwall Wildlife Trust x1 CCW Skomer MNR x1 Marine Awareness North Wales x1 J Davies Ceredigion CC x1 Others: Simon Avery, RSPB x1 JNCC Peterborough, Library x1 Ian Bullock x1 Mark Tasker, JNCC Aberdeen x1 Jim Poole x1 Jim Reid, JNCC Aberdeen x1 Powell Strong x1 J. Davies, JNCC Peterborough x1 David Thomas x1 Jenny Hill, JNCC/EN, Peterborough x1 Michelle Dunn, WTSWW x1 EN Peterborough Library x1 Chris Richardson, x1 Victoria Copley, EN, Peterborough x1 Hilbre Island Observatory x1 Eleanor Hill, EN, Peteborough x1 K. Abt, Wadden Sea, Germany x1 R. Covey, EN Cornwall x1 R. Witte, Texel, Netherlands x1 SNH Edinburgh, Library x1 Liverpool University Library x1 John Baxter, SNH Edinburgh x1 Port Erin Marine Lab Library x1 Graham Saunders, SNH Edinburgh x1 UCW Cardiff Library x1 National Library Wales x1 UCW Swansea Library x1 National Assembly for Wales Library x1 UCW Aberystwyth Library x1 C. Duck, SMRU x1 UCW Bangor Library x1 P. Hammond, SMRU x1 British Library, Document Supply Centre, Martin Bradley DoENI x1 Boston Spa x1 PML, Library, Plymouth x1 Recommended citation for this volume: Westcott, S & Stringell, T.B. 2003. Grey seal pup production for North Wales, 2002. Bangor, CCW Marine Monitoring Report No: 5. 55pp. 1 PREFACE Under the Council Directive 92/43 EEC on the Conservation of natural habitats and of wild fauna and flora (the ‘Habitats Directive’), member states are required to designate and conserve Special Areas of Conservation (SACs). The purpose of this is to maintain or restore habitats and species listed in Annex I and Annex II to ‘Favourable Conservation Status’. The grey seal Halichoerus grypus Fabricus is a species listed in Annex II of the Habitats Directive and in Wales they are ‘interest features’ of the Pembrokeshire Marine, Lleyn Peninsula and the Sarnau and Cardigan Bay candidate SACs. The work presented in this report is the second study of its type to investigate pup production as an indicator of the condition of grey seals in North Wales. Overall, the work has contributed to the development of methods and procedures for monitoring SACs as well as a dataset that will help to inform how targets should be set for the management of the Lleyn Peninsula and the Sarnau SAC. Over the last few years many other reviews, surveys, surveillance and monitoring projects have been initiated in Wales for Annex 1 and II habitats and species. Further CCW reports in this series will therefore be prepared on the results of this ongoing programme to develop marine monitoring work that underpins the management of conservation sites. RHAGAIR O dan Gyfarwyddeb y Cyngor 92/43 EEC ynghylch cadw cynefinoedd naturiol a chadw ffawna a fflora gwyllt (y 'Gyfarwyddeb Cynefinoedd'), mae'n ofynnol i'r aelod-wladwriaethau ddynodi a chadw Ardaloedd Cadwraeth Arbennig (ACA). Diben hyn yw cadw neu adfer y cynefinoedd a'r rhywogaethau sydd wedi'u rhestru yn Atodiad I ac Atodiad II i 'Statws Cadwraeth Ffafriol'. Mae’r morlo llwyd Halichoerus grypus Fabricus yn rhywogaeth sydd wedi'i rhestru yn Atodiad II i'r Gyfarwyddeb Cynefinoedd ac yng Nghymru mae'r morloi hyn yn 'nodweddion o ddiddordeb' mewn tri safle sy'n ymgeiswyr am statws ACA, sef Sir Benfro Forol, Pen Llŷn a'r Sarnau a Bae Ceredigion. Y gwaith a welir yn yr adroddiad hwn yw'r ail astudiaeth o'i math i edrych ar enedigaethau morloi bach fel dangosydd o gyflwr morloi llwyd Gogledd Cymru. Yn gyffredinol, mae'r gwaith wedi cyfrannu at ddatblygu dulliau a gweithdrefnau ar gyfer monitro ACA yn ogystal â set ddata a fydd yn helpu i ddangos sut y dylai targedau gael eu pennu ar gyfer rheoli ACA Pen Llŷn a'r Sarnau. Dros yr ychydig flynyddoedd diwethaf, mae llawer o adolygiadau, arolygon a gwaith arolygu a monitro wedi'u cychwyn yng Nghymru ar gyfer cynefinoedd a rhywogaethau Atodiad 1 a II. Gan hynny, bydd rhagor o adroddiadau yn y gyfres hon gan CCGC yn cael eu paratoi ynghylch canlyniadau'r rhaglen barhaus hon i ddatblygu gwaith monitro morol i fod yn sail ar gyfer rheoli'r safleoedd. 3 4 SUMMARY The results of a full census of pup production for the 2002 season, carried out between July 29 and December 18, 2002, are presented here. The repeatability of survey methods used in 2001 (Westcott, 2002) was simultaneously tested. The coasts surveyed lie between Aberystwyth in the south to the Dee Estuary in the east, including the coasts of Ynys Môn/Anglesey. Also included are all the islands adjacent to these coasts. Sea cave sites in the vicinity of Ynys Arw/North Stack, which could not be examined in the 2001 survey due to adverse weather, were explored and mapped during the present survey. Two Trwyn Cilan sites missed in 2001 were discovered, explored and mapped in the present work. 110 pups were located between August 18 and November 11, of which 9 died before weaning. Of these, 5 were stillborn. The main period of pup production in 2002 was September to October and similar to that of the 2001 season, being weeks 36 to 45 in 2002 compared with weeks 36 to 44 in 2001. In both 2001 and 2002, there was a secondary (lesser) peak in pup production, almost exclusively due to the late onset of pup production at Ynysoedd y Moelrhoniaid/The Skerries, where the two breeding seasons began late and were more compressed than in other districts. Where possible, seal mothers were photographed, in order to initiate a study examining the fidelity of seals using North Wales nursery sites, and to help identify unweaned pups which move from one nursery site to another in the company of their mothers. CRYNODEB Cyflwynir yma ganlyniadau cyfrifiad llawn o'r morloi a anwyd yn nhymor 2002, sef cyfrifiad a wnaed rhwng 29 Gorffennaf a 18 Rhagfyr 2002. Rhoddwyd cynnig ar yr un pryd ar ailadrodd y dulliau arolygu a ddefnyddiwyd yn 2001 (Westcott, 2002). Mae'r arfordiroedd a arolygwyd yn gorwedd rhwng Aberystwyth yn y de ac aber Dyfrdwy yn y dwyrain, gan gynnwys arfordir Ynys Môn. Cynhwysir hefyd yr holl ynysoedd sy'n gyfagos â'r arfordiroedd hyn. Cafodd ogofau môr yn ymyl Ynys Arw, nad oedd modd edrych arnyn nhw yn arolwg 2001 oherwydd tywydd gwael, eu harchwilio a'u mapio yn ystod yr arolwg presennol. Daethpwyd o hyd i ddau safle ar Drwyn Cilan a gollwyd yn 2001, eu harchwilio a'u mapio yn y gwaith presennol. Daethpwyd o hyd i 110 o forloi bach rhwng 18 Awst a 11 Tachwedd, y bu 9 ohonynt farw cyn cael eu diddyfnu. O'r rhain, cafodd 5 eu geni'n farw. Y prif gyfnod ar gyfer genedigaethau morloi yn 2002 oedd mis Medi i fis Hydref, yn debyg felly i dymor 2001, sef rhwng wythnos 36 ac wythnos 45 yn 2002 o'i gymharu ag wythnos 36 ac wythnos 44 yn 2001. Yn 2001 a 2002, cafwyd uchafbwynt eilaidd (llai) yn nifer y morloi oedd yn cael eu geni, a hwnnw'n deillio bron yn llwyr o'r ffaith bod y genedigaethau'n dechrau'n hwyr ar Ynysoedd y Moelrhoniaid, lle dechreuodd y ddau dymor bridio yn hwyr a lle roedden nhw'n fyrrach na'r ardaloedd eraill. Pan oedd yn bosibl, cafodd lluniau'r mamau eu tynnu, er mwyn dechrau astudiaeth i edrych ar ffyddlondeb y morloi sy'n defnyddio safleoedd meithrin y Gogledd, ac i helpu i adnabod morloi heb eu diddyfnu sy'n symud o'r naill safle meithrin i'r llall yng nghwmni eu mamau. 5 6 Grey seal pup production for North Wales, 2002 Westcott, S1 & Stringell, T.B.2 1 Nancherrow Cottage, Nancherrow, St Just-in-Penwith, Cornwall, TR19 7PW 2 Countryside Council for Wales HQ, Plas Penrhos, Ffordd Penrhos, Bangor, LL57 2LQ, UK Contents PREFACE / RHAGAIR 3 SUMMARY / CRYNODEB 5 1 INTRODUCTION 9 1.1 OBJECTIVES ........................................................................................................
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