{"refrec":{"BRefID":285542,"RR":"<b>Lepoint, G.; Bernard, L.; Gobert, S.; Michel, L.N.</b> (2016). Trophic interactions between two neustonic organisms: insights from Bayesian stable isotope data analysis tools. <i>Belg. J. Zool. 146(2)</i>: 123-133","BEntID":277567,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Belg. J. Zool. 146(2)</i>: 123-133","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Lepoint, G.; Bernard, L.; Gobert, S.; Michel, L.N.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Lepoint, G. <i>et al.</i>","Englishabstract":"The by-the-wind sailor <i>Velella velella</i> (Linnaeus, 1758) and its predator, the violet snail <i>Janthina globosa</i> (Swainson, 1822) are both floating neustonic organisms. Despite their global oceanic distribution and widespread blooms of <i>V. velella</i> in recent years, many gaps remain in our understanding about prey/predator interactions between these two taxa. Using stable isotope ratios of carbon and nitrogen, we aimed to study the trophic relationship between <i>V. velella</i> and <i>J. globose</i> and investigate diet variation of <i>V. velella</i> and <i>J. globosa</i> in relation to individuals’ size. Bayesian approaches were used to calculate isotopic niche metrics and the contribution of <i>V. velella</i> to the <i>J. globose</i> diet. Our data showed that the isotopic niche of <i>V. velella</i> differed markedly from that of <i>J. globosa</i>. It was larger and did not overlap that of the <i>J. globose</i>, indicating a more variable diet but at a lower trophic level than <i>J. globose</i>. The isotopic niche of <i>V. velella</i> also varied according to the size class of the individual. Small individuals showed a larger isotopic niche than larger animals and low overlap with those of the larger individuals. <i>J. globose</i> displayed very low isotopic variability and very small isotopic niches. In contrast, there were no isotopic composition nor isotopic niche differences between <i>J. globose</i> of any size. This very low isotopic variability suggested that <i>J. globosa</i> is a specialist predator, feeding, at least in this aggregation, principally on <i>V. velella</i>. Moreover, outputs of a stable isotope mixing model revealed preferential feeding on medium to large (> 500 mm<sup>2</sup>) <i>V. velella</i> colonies. While our isotopic data showed the trophic relationship between <i>V. velella</i> and <i>J. globosa</i>, many questions remain about the ecology of these two organisms, demonstrating the need for more fundamental studies about neustonic ecosystems.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Trophic interactions between two neustonic organisms: insights from Bayesian stable isotope data analysis tools","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Janthina globosa; Velella velella; Mediterranean Sea; neuston; SIBER;SIAR","OtherDescriptors":null,"Notes":null,"AnaPub":2016,"MonPub":null,"DateUpdate":"2017-05-22","DateCreate":"2017-05-16","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000385247000006","VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":285542,"PubliDate":2016,"Pagination":"123-133","XtraPublOfAnaID":null,"ISBN":null,"Volume":"146","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":44108,"SerRR":"Belgian Journal of Zoology. Koninklijke Belgische Vereniging voor Dierkunde = Société royale zoologique de Belgique: Gent.  ISSN 0777-6276; e-ISSN 2295-0451","StandardTitleSer":"Belgian Journal of Zoology","ISSN":"0777-6276","AbbrevSer":"Belg. J. Zool.","StandardTitleMon":null,"StartPage":123,"Pages":11,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Lepoint","Firstname":"Gilles","Initials":"G.","Affiliation":"Laboratory of Oceanology, FOCUS centre, University of Liège","Discriminator":null,"CorporateFlag":0,"BEntID":277567,"AutID":257977,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":"Université de Liège; Faculté des Sciences; Département de Biologie, Ecologie et Evolution; Laboratoire d'Océanologie Biologique","ORCID":"0000-0003-4375-0357","PersID":7091,"InsID":459},{"AutName":"Bernard","Firstname":"Laurent","Initials":"L.","Affiliation":"Laboratory of Oceanology, FOCUS centre, University of Liège","Discriminator":null,"CorporateFlag":0,"BEntID":277567,"AutID":256845,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":"Université de Liège; 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