{"refrec":{"BRefID":108624,"RR":"<b>Das, K.; Lepoint, G.; Leroy, Y.; Bouquegneau, J.-M.</b> (2003). Marine mammals from the southern North Sea: feeding ecology data from d<sup>13</sup>C and d<sup>15</sup>N measurements. <i>Mar. Ecol. Prog. Ser. 263</i>: 287-298. <a href=\"http://dx.doi.org/10.3354/meps263287\" target=\"_blank\">dx.doi.org/10.3354/meps263287</a>","BEntID":103393,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 263</i>: 287-298. <a href=\"https://dx.doi.org/10.3354/meps263287\" target=\"_blank\">https://dx.doi.org/10.3354/meps263287</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Das, K.; Lepoint, G.; Leroy, Y.; Bouquegneau, J.-M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Das, K. <i>et al.</i>","Englishabstract":"The harbour porpoise <i>Phocoena phocoena</i>, grey seal <i>Halichoerus grypus</i>, harbour seal <i>Phoca vitulina</i> and white-beaked dolphin <i>Lagenorhynchus albirostris</i> are regularly found stranded along southern North Sea coasts. Occasionally, offshore species such as the fin whale <i>Balaenoptera physalus</i>, the white-sided dolphin <i>L. acutus</i> and the sperm whale <i>Physeter macrocephalus</i> are also found stranded. In order to trace their diet, we measured d<sup>13</sup>C and d<sup>15</sup>N in their muscles as well as in 49 invertebrate and fish species collected from the southern North Sea. The d<sup>15</sup>N data indicate that the harbour seal, grey seal and white-beaked dolphin occupy the highest trophic position, along with ichtyophageous fishes such as the cod <i>Gadus morhua</i> (mean muscle values of 18.7, 17.9, 18.8 and 19.2‰ respectively). The harbour porpoise occupies a slightly lower trophic position (mean d<sup>15</sup>N value of 16.2‰), reflecting a higher amount of zooplanktivorous fishes in its diet (mean d<sup>15</sup>N of 14.7‰); 2 suckling harbour porpoises displayed a significant d<sup>15</sup>N enrichment of 2.2‰ compared to adult females. Adult females are d<sup>15</sup>N-enriched compared to adult male harbour porpoises. Fin whales, sperm whales and white-sided dolphins are <sup>13</sup>C-depleted compared to southern North Sea particulate organic matter and species, suggesting that despite regular sightings, they do not feed within the southern North Sea area.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Marine mammals from the southern North Sea: feeding ecology data from d<sup>13</sup>C and d<sup>15</sup>N measurements","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"north sea; marine mammals; stable isotopes; food web","OtherDescriptors":null,"Notes":null,"AnaPub":2003,"MonPub":null,"DateUpdate":"2012-04-04","DateCreate":"2007-03-16","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000187934600024","VABBcode":null,"OpenAcc":0,"DOI":"10.3354/meps263287"},"refs":null,"anarec":{"AnaID":108624,"PubliDate":2003,"Pagination":"287-298","XtraPublOfAnaID":null,"ISBN":null,"Volume":"263","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43354,"SerRR":"Marine Ecology Progress Series. 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