{"refrec":{"BRefID":391960,"RR":"<b>Romero, J.; Vieira, C.; Garrido, S.; Hermida, M.; Catry, P.; Faria, G.; Granadeiro, J.P.</b> (2021). Diet and trophic position of two mackerel species in the archipelago of Madeira, Portugal. <i>J. Fish Biol. 99(3)</i>: 831-843. <a href=\"https://dx.doi.org/10.1111/jfb.14766\" target=\"_blank\">https://dx.doi.org/10.1111/jfb.14766</a>","BEntID":389716,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Fish Biol. 99(3)</i>: 831-843. <a href=\"https://dx.doi.org/10.1111/jfb.14766\" target=\"_blank\">https://dx.doi.org/10.1111/jfb.14766</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Romero, J.; Vieira, C.; Garrido, S.; Hermida, M.; Catry, P.; Faria, G.; Granadeiro, J.P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Romero, J. <i>et al.</i>","Englishabstract":"The Atlantic chub mackerel <i>Scomber colias</i> and the blue jack mackerel <i>Trachurus picturatus</i> are two abundant species in the Macaronesia region which includes the archipelago of Madeira, Portugal. Both are key species in the trophic web, being important prey for several local top predators, such as seabirds and marine mammals. Nonetheless, little is known about their feeding ecology in oceanic environments. In this study, the authors describe the seasonal variation in the diet of <i>S. colias</i> and <i>T. picturatus</i> in the oceanic region of Madeira throughout a year. Visual inspection of stomach contents revealed that <i>S. colias</i> fed on a broader range of prey groups than <i>T. picturatus</i>, but for both species, zooplankton (particularly calanoid copepods) and fish were the most important food items. The diet of <i>S. colias</i> included a higher proportion of fish, namely Atlantic saury <i>Scomberesox saurus</i> and <i>S. colias</i>, than that of <i>T. picturatus</i>, that included mostly the longspine snipefish <i>Macroramphosus scolopax</i>. <i>T. picturatus</i> consumed a higher proportion of decapods and other copepods. Seasonal variation was found in the diet of both species, with zooplanktonic species being more important in colder months (February to April) for <i>S. colias</i> and during warm months (May to October) for <i>T. picturatus</i>. Their diet in other seasons was dominated by fish. Although they consume similar prey, carbon and nitrogen stable isotope analysis of muscle of <i>S. colias</i> and <i>T. picturatus</i> showed little overlap in their diets, and <i>T. picturatus</i> showed higher δ<sup>15</sup>N and a narrower isotopic niche.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Diet and trophic position of two mackerel species in the archipelago of Madeira, Portugal","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-15 01:33:57.775087","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"copepods, diet, mackerels, stable isotopes, trophic position","OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2024-04-22","DateCreate":"2024-04-22","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0,"DOI":"10.1111/jfb.14766"},"refs":null,"anarec":{"AnaID":391960,"PubliDate":2021,"Pagination":"831-843","XtraPublOfAnaID":null,"ISBN":null,"Volume":"99","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43231,"SerRR":"Journal of Fish Biology. 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