Yellow belly as honest signal of female quality in Knipowitschia panizzae(Gobiidae)
Identifieur interne : 001204 ( Main/Merge ); précédent : 001203; suivant : 001205Yellow belly as honest signal of female quality in Knipowitschia panizzae(Gobiidae)
Auteurs : C. Mazzoldi [Italie] ; M. Massironi [Italie] ; M. B. Rasotto [Italie]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2003-12.
Abstract
Sexually dimorphic traits are common in fish species, and examples from both males and females have been described. The function of these traits has been widely investigated in males. On the contrary, female ornaments have been studied mainly in sex role reversed species, such as pipefish, while their role in species with ‘conventional’ sex roles remain to be investigated. This study focused on the presence, function, and possible role as indicator of female quality of a sexually dimorphic nuptial trait in the lagoon goby, Knipowitschia panizzae. In this species, that present conventional sex roles, females show a yellow spot on the belly. Aquarium spawning experiments demonstrated that the coloration on the belly is due to dermal pigments, is displayed only when female is ready to spawn and is switched off within few minutes from the end of egg deposition. This sexual trait presents variability in size among females and indicates female fecundity relatively to her own body size. As a consequence, female yellow belly appears to be an honest signal of female quality. Field data on natural nests highlighted that males perform parental cares mostly only on one egg batch at a time and the modality of egg deposition suggested that males are limited in their potential reproductive rates by environmental factors. Male limitation in egg care could constitute the basis for a female biased operational sex ratio, favouring male choosiness and the evolution of female nuptial displays.
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DOI: 10.1111/j.1095-8649.2003.0216z.x
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Colombo 3, 35131 Padova</wicri:regionArea><orgName type="university">Université de Padoue</orgName><placeName><settlement type="city">Padoue</settlement><region type="region" nuts="2">Vénétie</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Fish Biology</title><idno type="ISSN">0022-1112</idno><idno type="eISSN">1095-8649</idno><imprint><publisher>Blackwell Science Ltd/Inc</publisher><pubPlace>Oxford, UK; Malden, USA</pubPlace><date type="published" when="2003-12">2003-12</date><biblScope unit="volume">63</biblScope><biblScope unit="supplement">s1</biblScope><biblScope unit="page" from="237">237</biblScope><biblScope unit="page" to="237">237</biblScope></imprint><idno type="ISSN">0022-1112</idno></series><idno type="istex">38ABBF8D759EDCEFE0B37A0CC406B0AC5F20BC36</idno><idno type="DOI">10.1111/j.1095-8649.2003.0216z.x</idno><idno type="ArticleID">JFB216Z</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1112</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Sexually dimorphic traits are common in fish species, and examples from both males and females have been described. The function of these traits has been widely investigated in males. On the contrary, female ornaments have been studied mainly in sex role reversed species, such as pipefish, while their role in species with ‘conventional’ sex roles remain to be investigated. This study focused on the presence, function, and possible role as indicator of female quality of a sexually dimorphic nuptial trait in the lagoon goby, Knipowitschia panizzae. In this species, that present conventional sex roles, females show a yellow spot on the belly. Aquarium spawning experiments demonstrated that the coloration on the belly is due to dermal pigments, is displayed only when female is ready to spawn and is switched off within few minutes from the end of egg deposition. This sexual trait presents variability in size among females and indicates female fecundity relatively to her own body size. As a consequence, female yellow belly appears to be an honest signal of female quality. Field data on natural nests highlighted that males perform parental cares mostly only on one egg batch at a time and the modality of egg deposition suggested that males are limited in their potential reproductive rates by environmental factors. Male limitation in egg care could constitute the basis for a female biased operational sex ratio, favouring male choosiness and the evolution of female nuptial displays.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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