{"refrec":{"BRefID":257666,"RR":"<b>Poisbleau, M.; Demongin, L.; Chastel, O.; Eens, M.; Quillfeldt, P.</b> (2011). Yolk androgen deposition in rockhopper penguins, a species with reversed hatching asynchrony. <i>Gen. Comp. Endocrinol. 170(3)</i>: 622-628. <a href=\"https://dx.doi.org/10.1016/j.ygcen.2010.11.027\" target=\"_blank\">https://dx.doi.org/10.1016/j.ygcen.2010.11.027</a>","BEntID":249675,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Gen. Comp. Endocrinol. 170(3)</i>: 622-628. <a href=\"https://dx.doi.org/10.1016/j.ygcen.2010.11.027\" target=\"_blank\">https://dx.doi.org/10.1016/j.ygcen.2010.11.027</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Poisbleau, M.; Demongin, L.; Chastel, O.; Eens, M.; Quillfeldt, P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Poisbleau, M. <i>et al.</i>","Englishabstract":"To maximize fitness, females should invest optimally in the siblings within a litter or brood and adapt this investment to environmental conditions. Chick mass and yolk androgens have been shown to influence the outcome of sibling competition. In birds, asynchronous hatching plays a major role in this process and often leads to brood reduction. We studied maternal deposition of yolk androgens in eggs of southern rockhopper penguins (<i>Eudyptes chrysocome chrysocome</i>). Contrary to other avian models, laying and hatching sequences do not coincide in this species, which exhibits reversed hatching asynchrony. This provides a unique model to test whether the first egg to hatch (B-egg), which is the most likely to survive, differs in composition from the second egg to hatch (A-egg). We found that B-eggs had higher egg masses, yolk masses, yolk androgen concentrations and total yolk androgen amounts than A-eggs. This was observed consistently for the three androgens analyzed (testosterone, androstenedione and 5a-dihydrotestosterone). Laying date affected androgen deposition into A- and B-eggs differently. Interestingly, late clutches had proportionally higher androgen levels in the B-egg compared to the A-egg than early clutches. We discuss these results in relation to the chronology of egg formation and the potential effect of the observed differences on embryo development and brood reduction.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Yolk androgen deposition in rockhopper penguins, a species with reversed hatching asynchrony","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-18 01:31:51.143909","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Yolk testosterone (T); Yolk androstenedione (A4); Yolk 5alpha-dihydrotestosterone (DHT); Reversed hatching asynchrony; Layingsequence; Laying date","OtherDescriptors":null,"Notes":null,"AnaPub":2011,"MonPub":null,"DateUpdate":"2020-06-19","DateCreate":"2016-05-29","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000286647300027","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.ygcen.2010.11.027"},"refs":null,"anarec":{"AnaID":257666,"PubliDate":2011,"Pagination":"622-628","XtraPublOfAnaID":null,"ISBN":null,"Volume":"170","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42729,"SerRR":"General and Comparative Endocrinology. Elsevier: New York,.  ISSN 0016-6480; e-ISSN 1095-6840","StandardTitleSer":"General and Comparative Endocrinology","ISSN":"0016-6480","AbbrevSer":"Gen. Comp. 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