{"refrec":{"BRefID":302771,"RR":"<b>Verhelst, P.; De Meyer, J.; Reubens, J.; Coeck, J.; Goethals, P.; Moens, T.; Mouton, A.M.</b> (2018). Unimodal head-width distribution of the European eel (<i>Anguilla anguilla</i> L.) from the Zeeschelde does not support disruptive selection. <i>PeerJ 6</i>: e5773. <a href=\"https://dx.doi.org/10.7717/peerj.5773\" target=\"_blank\">https://dx.doi.org/10.7717/peerj.5773</a>","BEntID":295017,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>PeerJ 6</i>: e5773. <a href=\"https://dx.doi.org/10.7717/peerj.5773\" target=\"_blank\">https://dx.doi.org/10.7717/peerj.5773</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Verhelst, P.; De Meyer, J.; Reubens, J.; Coeck, J.; Goethals, P.; Moens, T.; Mouton, A.M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Verhelst, P. <i>et al.</i>","Englishabstract":"Since the early 20th century, European eels (<i>Anguilla anguilla</i> L.) have been dichotomously classified into `narrow' and `broad' heads. These morphs are mainly considered the result of a differential food choice, with narrow heads feeding primarily on small/soft prey and broad heads on large/hard prey. Yet, such a classification implies that head-width variation follows a bimodal distribution, leading to the assumption of disruptive selection. We investigated the head morphology of 272 eels, caught over three consecutive years (2015-2017) at a single location in the Zeeschelde (Belgium). Based on our results, BIC favored a unimodal distribution, while AIC provided equal support for a unimodal and a bimodal distribution. Notably, visualization of the distributions revealed a strong overlap between the two normal distributions under the bimodal model, likely explaining the ambiguity under AIC. Consequently, it is more likely that head-width variation followed a unimodal distribution, indicating there are no disruptive selection pressures for bimodality in the Zeeschelde. As such, eels could not be divided in two distinct head-width groups. Instead, their head widths showed a continuum of narrow to broad with a normal distribution. This pattern was consistent across all maturation stages studied here.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Unimodal head-width distribution of the European eel (<i>Anguilla anguilla</i> L.) from the Zeeschelde does not support disruptive selection","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-03-20 14:16:18.071037","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Maturation stages; Head dimorphism; Disruptive selection; Condition; European eel; Unimodality; Bimodality  ","OtherDescriptors":null,"Notes":null,"AnaPub":2018,"MonPub":null,"DateUpdate":"2021-05-17","DateCreate":"2018-11-06","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000452327000003","VABBcode":null,"OpenAcc":1,"DOI":"10.7717/peerj.5773"},"refs":null,"anarec":{"AnaID":302771,"PubliDate":2018,"Pagination":"e5773","XtraPublOfAnaID":null,"ISBN":null,"Volume":"6","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":242055,"SerRR":"PeerJ. 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