{"refrec":{"BRefID":57339,"RR":"<b>Estrada, J.A.; Rice, A.N.; Lutcavage, M.; Skomal, G.B.</b> (2003). Predicting trophic position in sharks of the north-west Atlantic Ocean using stable isotope analysis. <i>J. Mar. Biol. Ass. U.K. 83(6)</i>: 1347-1350. <a href=\"https://dx.doi.org/10.1017/S0025315403008798\" target=\"_blank\">https://dx.doi.org/10.1017/S0025315403008798</a>","BEntID":54925,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Mar. Biol. Ass. U.K. 83(6)</i>: 1347-1350. <a href=\"https://dx.doi.org/10.1017/S0025315403008798\" target=\"_blank\">https://dx.doi.org/10.1017/S0025315403008798</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Estrada, J.A.; Rice, A.N.; Lutcavage, M.; Skomal, G.B.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Estrada, J.A. <i>et al.</i>","Englishabstract":"Trophic positions (TP) were estimated for the blue shark (<span class=\"italic\">Prionace glauca</span>), shortfin mako (<span class=\"italic\">Isurus oxyrinchus</span>), thresher shark (<span class=\"italic\">Alopias vulpinus</span>), and basking shark (<span class=\"italic\">Cetorhinus maximus</span>) using stable isotope ratios of carbon (δ<span class=\"sup\">13</span>C) and nitrogen (δ<span class=\"sup\">15</span>N). The basking shark had the lowest TP (3·1) and δ<span class=\"sup\">15</span>N value (10·4‰), whereas the thresher shark had the highest values (4·5, 15·2‰). Mako sharks showed considerable variation in TP and isotopic values, possibly due to foraging from both inshore and offshore waters. Thresher sharks were significantly more enriched in δ<span class=\"sup\">15</span>N than blue sharks and mako sharks, suggesting a different prey base. The δ<span class=\"sup\">13</span>C values of thresher sharks and mako sharks varied significantly, but neither was significantly different from that of blue sharks. No statistical differences were found between our TP estimations and those derived from published stomach contents analyses, indicating that stable isotope data may be used to estimate the trophic status of sharks.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Predicting trophic position in sharks of the north-west Atlantic Ocean using stable isotope analysis","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-17 01:31:32.222640","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2003,"MonPub":null,"DateUpdate":"2020-09-08","DateCreate":"2004-02-11","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000188941800032","VABBcode":null,"OpenAcc":0,"DOI":"10.1017/S0025315403008798"},"refs":null,"anarec":{"AnaID":57339,"PubliDate":2003,"Pagination":"1347-1350","XtraPublOfAnaID":null,"ISBN":null,"Volume":"83","Issue":"6","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43277,"SerRR":"Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge.  ISSN 0025-3154; e-ISSN 1469-7769","StandardTitleSer":"Journal of the Marine Biological Association of the United Kingdom","ISSN":"0025-3154","AbbrevSer":"J. Mar. Biol. Ass. 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