{"refrec":{"BRefID":6244,"RR":"<b>Silcocks, A.F.</b> (1999). The size of the breeding population of Manx Shearwater <i>Puffinus puffinus</i> on Bardsey (Wales) in 1996 = Het aantal Noordse Pijlstormvogels broedend op Bardsey (Wales) in 1996. <i>Atlant. Seabirds 1(2)</i>: 77-84","BEntID":6244,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Atlant. Seabirds 1(2)</i>: 77-84","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Silcocks, A.F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Silcocks, A.F.","Englishabstract":"In late May and early June 1996 a whole-island survey of Manx Shearwaters was undertaken on Bardsey (Wales, UK). All apparently occupied burrows (AOB) were counted, resulting in a total of 6927 AOBs. An additional survey of shearwaters nesting amongst gorse bushes was carried out using a call playback technique and revealed an additional 101 pairs. A comparison of the accuracy of the two censusing techniques revealed a disparity of under 10% in a selected survey area. A future monitoring program for the Manx Shearwaters on Bardsey is proposed.","AbstractOtherLang":"Het eilandje Bardsey voor de kust van Wales is een natuurreservaat waar een kolonie Noordse Pijlstormvogels (<i>Puffinus puffinus</i>) gevestigd is. Tot dusverre werd maar eenmaal eerder een poging ondernomen om de omvang van deze populatie vast te stellen met een integrale inventarisatie. Gekozen werd voor een methode die later gemakkelijk en precies herhaald kan worden en de veldwerkers werd geleerd hoe 'bezette nestholen' van pijlstormvogels (faeces en veren bij de nestingang en dikwijls duidelijk platgetreden grond met twee uitgesleten loopsporen van de binnenwaggelende vogels) kunnen worden onderscheiden van lege holen en van konijnenholen. Op sommige plaatsen, waar de vegetatie het zicht op de grond ontnam, werden geluidsopnames afgespeeld om de aanwezige broedvogels een reactie te ontlokken. De inventarisatie werd uitgevoerd tussen 20 mei en 8 juni 1996, de periode waarin de Noordse Pijlstormvogels hun ei uitbroeden. Uit een test, uitgevoerd op de zuidpunt van het eiland, bleek de visuele methode tot iets hogere uitkomsten te leiden dan het afspelen van bandjes (9% verschil). In totaal werden 6927 bezette holen aangetroffen. Ofschoon de visuele methode wellicht tot een overschatting van de populatie heeft geleid, is het duidelijk dat de kolonie op Bardsey sinds 1963 aanmerkelijk is gegroeid. Het broeden op Bardsey werd voor het eerst geconstateerd in 1901 (30-40 paren op de noordelijke hellingen) en schattingen tussen 1930 en 1953 varieerden van 100-1000 broedparen. Alleen in 1963 werd eveneens een volledige inventarisatie uitgevoerd en toen werd het bestand geschat op ongeveer 2000 paren.","BibLvlCode":"AS","StandardTitle":"The size of the breeding population of Manx Shearwater <i>Puffinus puffinus</i> on Bardsey (Wales) in 1996 = Het aantal Noordse Pijlstormvogels broedend op Bardsey (Wales) in 1996","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1999,"MonPub":null,"DateUpdate":"2017-09-05","DateCreate":"2001-02-21","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":6244,"PubliDate":1999,"Pagination":"77-84","XtraPublOfAnaID":null,"ISBN":null,"Volume":"1","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45223,"SerRR":"Atlantic Seabirds. Seabird Group and Dutch Seabird Group: Sandy, Bedfordshire.  ISSN 1388-2511","StandardTitleSer":"Atlantic Seabirds","ISSN":"1388-2511","AbbrevSer":"Atlant. 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