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首页> 外文期刊>ICES Journal of Marine Science >Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.)
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Depensation, probability of fertilization, and the mating system of Atlantic cod (Gadus morhua L.)

机译：大西洋鳕（Gadus morhua L.）的离巢，受精可能性和交配系统

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摘要

Atlantic cod (Gadus morhua L.) have been severely overexploited and are currently at historic population lows, having declined 90% in the North Sea and 99% off northeast Newfoundland in recent decades. Slow rates of recovery and continuing declines may be attributable to depensation, defined as a reduction in per capita growth rate concomitant with reduced population size. Several potential causes of depensation relate to low mating success and consequent reduced production of offspring. We explore the empirical basis of one of these in Atlantic cod using egg fertilization and male abundance data obtained from 21 experimental populations generated by three independent research programmes. We find support for the hypotheses that (a) fertilization rate declines with abundance and (b) variance in fertilization rate increases as population size declines. The former identifies one potential mechanism underlying depensation in Atlantic cod. The latter has negative genetic consequences for effective population size (N_e), resulting in a decline in the ratio of N_e to census population size (N_e/N_c) with declining abundance. Our results may have general implications for the conservation biology of broadcast-spawning marine fish, particularly those with mating systems similar to that of Atlantic cod.
机译：大西洋鳕（Gadus morhua L.）已被严重过度开发，目前处于历史低点，近几十年来在北海下降了90％，在纽芬兰东北部下降了99％。恢复速度缓慢和持续下降可能归因于退休，这是指人均增长率的下降与人口规模的减少有关。脱落的几种潜在原因与交配成功率低和后代产量降低有关。我们使用受精卵和三个独立研究计划所产生的21个实验种群的雄性丰度数据，探索了其中一种在大西洋鳕鱼中的经验基础。我们发现以下假设得到支持：（a）受精率随数量的增加而下降，（b）受精率随人口规模的减少而增加。前者确定了大西洋鳕鱼养殖中潜在的一种潜在机制。后者对有效人口规模（N_e）具有负面的遗传影响，导致N_e与人口普查人口规模（N_e / N_c）的比率下降，而丰度下降。我们的结果可能对产卵繁殖的海水鱼类，特别是那些与大西洋鳕鱼交配系统相似的鱼类的保护生物学具有一般意义。

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