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首页> 外文期刊>Biological Journal of the Linnean Society >Sperm depletion may not limit male reproduction in a capital breeder
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Sperm depletion may not limit male reproduction in a capital breeder

机译：精子耗竭可能不会限制雄性繁殖鸡的雄性繁殖

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摘要

Male reproduction is not only constrained by the number of encountered females but also by physiological limitations, including sperm production and the ability to sustain courtship and mating. Over a breeding season, sperm stores may drop in tandem with male energetic reserves or motivation, confounding the constraints imposed by sperm quantity with other correlated physiological limitations. We used wood frogs (Lithobates sylvaticus) to test whether explosive capital breeders are functionally limited by sperm depletion. We paired males with four conspecific females in succession and counted all of the fertilized and unfertilized eggs that each pair produced. In general, males did not experience a progressive decrease in fertilization rates with each mating (which is characteristic of sperm depletion). Instead, a few males experienced complete fertilization failure during their third and/or fourth mating, perhaps as a result of physical exhaustion, loss of motivation or hormonal changes. This pattern suggests that, even if male wood frogs do become increasingly sperm depleted over a breeding season, they are not necessarily limited by sperm. Understanding how and why fertilization rates change over multiple matings (i.e. incremental decrease vs. all-or-nothing) will help clarify the role of sperm depletion in limiting reproduction.
机译：雄性生殖不仅受到所遇到的雌性数量的限制，而且还受到生理上的限制，包括精子的产生以及维持求偶和交配的能力。在繁殖季节，精子储备可能与雄性能量储备或动力一起下降，从而使精子数量的限制与其他相关的生理限制相混淆。我们使用了木蛙（Lithobates sylvaticus）来测试易爆的繁殖者是否在功能上受到精子耗竭的限制。我们将雄性与四个雌性相继配对，并计数每对产生的所有受精卵和未受精卵。通常，每次交配时，雄性的受精率都不会逐渐降低（这是精子耗竭的特征）。相反，一些雄性在第三和/或第四次交配时经历了完全的受精失败，这可能是由于体力消耗，失去动力或荷尔蒙变化所致。这种模式表明，即使雄性木蛙在繁殖季节确实变得越来越枯竭，也不一定受到精子的限制。了解受精率如何以及为何在多次交配中发生变化（即增量减少与全有或全无），将有助于阐明精子消耗在限制生殖中的作用。

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