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首页> 外文期刊>The Open Fish Science Journal >Differences in Pelvic Fin Length Represent Sexual Dimorphism in Utah Chub (Gila atraria)
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Differences in Pelvic Fin Length Represent Sexual Dimorphism in Utah Chub (Gila atraria)

机译:骨盆鳍长度的差异代表犹他州丘布(Gila atraria)的性二态性。

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The cyprinid fish Gila atraria Girard (Utah chub) is generally considered a sexually monomorphic species.However, prior observations revealed variation in pelvic fin length within populations that appears sexually dimorphic.We measured the relative pelvic fin length of 419 sexually mature Utah chub from 8 different locations to determine themagnitude and generality of this apparent dimorphism. Pelvic fin length in G. atraria differs between sexes by about 10%on average; males have longer pelvic fins than females. The dimorphism is general across all locations, but it is not relatedto body size. Magnitude of the dimorphism varies by predation environment – the difference between males and femalesis slightly greater in low predation environments. We find no evidence for an adaptive function for this dimorphism; however,it does provide an efficient mechanism for determining sex without dissection.
机译:塞浦路斯鱼类吉拉阿特里亚(Gila atraria Girard)(Utah chub)通常被认为是一种有性的单形种,但是先前的观察显示,在两性似性的种群中,骨盆鳍的长度存在差异。我们从8个测量了419个有性成熟的犹他州丘骨的相对骨盆鳍长度确定此明显二态性的大小和普遍性的不同位置。性别差异的骨盆鳍长度平均约有10%。男性的骨盆鳍比女性的更长。双态性在所有位置都是普遍的,但与体型无关。双态的大小因捕食环境而异-在低捕食环境中,雄性和雌性之间的差异稍大。我们没有证据表明这种二态性具有自适应功能。但是,它确实提供了一种无需解剖即可确定性别的有效机制。

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