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首页> 外文期刊>Marine ecology progress series >Sperm acquisition and storage dynamics facilitate sperm limitation in the selectively harvested blue crab Callinectes sapidus
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Sperm acquisition and storage dynamics facilitate sperm limitation in the selectively harvested blue crab Callinectes sapidus

机译：精子的获取和储存动力学促进了选择性收获的蓝蟹Callinectes sapidus的精子限制

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摘要

Selective harvest of male blue crabs Callinectes sapidus can reduce the operational sex ratio and alter male mating history and behaviors, reducing the quantity of sperm females acquire during mating. Females mate shortly after molting to maturity, storing sperm for at least 2 yr, and fertilize multiple broods of eggs. We combined field surveys, a mark-recapture experiment, and modeling in the most extensive study of sperm storage and use after mating in blue crabs evaluating (1) spatiotemporal patterns in sperm quantity acquired during mating, (2) the pattern and rate of decline of sperm during storage, (3) the quantity of sperm used for fertilization, and (4) the potential for sperm limitation. We also explored the spatial extent of spawning in Chesapeake Bay in comparison to the spawning sanctuary. Female crabs acquired up to 3 x 10(9) sperm, but sperm stores declined by 90-95% in the first 1-2 mo after mating. Sperm quantity differences between first- and second-year spawners indicated use of 4 sperm egg(-1) during fertilization. Approximately 15 % of spawning females were in their second spawning season, and remaining sperm stores were indicative of sperm limitation resulting in a 5-10% decrease in reproductive output of the spawning stock. The current spawning sanctuary encompassed 98 % of ovigerous females and 100% of females with evidence of prior spawning. Although many females do not experience sperm limitation prior to harvest or natural mortality, reductions in the reproductive output of second-year spawners likely limits population resilience to inter-annual variation in spawning stock biomass.
机译：选择性收获雄性蓝蟹Callinectes sapidus可以降低可操作的性别比，改变雄性交配的历史和行为，减少雌性在交配过程中获得的精子数量。雌性蜕皮至成熟后不久交配，将精子储存至少2年，并为多卵卵受精。我们结合了实地调查，重获标记的实验以及在蓝蟹交配后对精子存储和使用的最广泛研究中的建模，以评估（1）交配过程中获得的精子数量的时空模式，（2）下降的模式和速率储存期间精子的数量；（3）用于受精的精子数量；（4）限制精子的潜力。与产卵保护区相比，我们还探索了切萨皮克湾产卵的空间范围。雌蟹最多能吸收3 x 10（9）精子，但在交配后的最初1-2个月中，精子储藏量下降了90-95％。第一年和第二年产卵器之间的精子数量差异表明在受精过程中使用了4个精子卵（-1）。大约有15％的产卵雌性处于第二个产卵季节，剩余的精子储备表明精子受到限制，导致产卵种群的生殖产量下降5-10％。目前的产卵保护区包括98％的有卵雌性和100％的雌性具有先前产卵的证据。尽管许多雌性在收获前或自然死亡前没有受到精子的限制，但是第二年产卵的繁殖产量下降可能会限制种群对产卵生物量年际变化的适应力。

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