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首页> 外文期刊>Canadian Journal of Zoology >Sexual dimorphism in pelvic fin length of Atlantic cod
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Sexual dimorphism in pelvic fin length of Atlantic cod

机译：大西洋鳕鱼骨鳍长度的两性异性

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摘要

Behavioural differences between females and males may result in sexual dimorphism among morphological traits associated with these behaviours. In the broadcast-spawning Atlantic cod (Cadus morhua L., 1758), release of gametes occurs during a "ventralmount" in which the male positions himself directly beneath the female while grasping her with his pelvic fins. Males also display the pelvic fins during agonistic encounters with other males. Based on data obtained from four Atlantic cod populations offCanada and Norway, we find clear evidence of sexual dimorphism in pelvic fin sile, the fins being significantly larger in males than in females. Pelvic fin size was, however, not more variable than other morphological traits and was not correlated withbody condition or drumming muscles mass (hypothesized to be a secondary sexual characteristic in this species). To our knowledge, this is the first study to demonstrate sexual dimorphism in any external morphological trait in a gadoid fish. Although theobserved differences in pelvic fin size may be a product of sexual selection, we identify future work to test this hypothesis and to explore more fully the causes and fitness consequences of this sexual bias in Atlantic cod.
机译：男性和女性之间的行为差​​异可能会导致与这些行为相关的形态特征之间的性二态性。在产卵的大西洋鳕鱼（Cadus morhua L.，1758）中，配子的释放发生在“腹壁”期间，雄性将自己定位在雌性的正下方，同时用腹鳍抓住雌性。雄性在与其他雄性发生争斗时也会显示骨盆鳍。根据从加拿大和挪威以外的四个大西洋鳕鱼种群获得的数据，我们发现骨盆鳍中性二态性的明显证据，其中男性的鳍明显大于女性的鳍。然而，骨盆鳍的大小没有比其他形态特征更多的变化，并且与身体状况或击鼓的肌肉质量（假设为该物种的次要性特征）无关。据我们所知，这是第一个研究证明了角质鱼类的任何外部形态特征中的性二态性的研究。尽管观察到的骨盆鳍大小差异可能是性选择的产物，但我们确定了未来的工作，以检验该假设并更充分地探索大西洋鳕鱼中这种性偏见的原因和适应性后果。

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