Environmental and parental control of Pacific sardine (Sardinops sagax) recruitment
Environmental and parental control of Pacific sardine (Sardinops sagax) recruitment
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DOI：
10.1093/icesjms/fst173
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发表时间：
2014-10
影响因子：
3.3
通讯作者：
J. Zwolinski;D. Demer
中科院分区：
文献类型：
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作者：
J. Zwolinski;D. Demer
我们证实，沙丁鱼招聘在加州电流，在过去的三十年里，模仿太平洋年代际振荡（PDO）指数所示的北太平洋环境的各个方面。在PDO值为正和负的情况下，种群增长和下降的周期分别是连续的几年。在“温暖”时期，每生物量的平均新兵人数是在“寒冷”时期的三倍以上。除了沙丁鱼幼虫所经历的环境条件，我们表明，沙丁鱼招聘的变异部分解释了产卵季节和成人条件因素前几个月的环境条件。我们假设，沙丁鱼在产卵过程中有代谢缺陷，所以事先良好的喂养机会是必要的，以增加总的繁殖力和后代的鲁棒性，以提高繁殖和生存，分别。我们的研究结果增强了一个世纪的理论，即小型中上层鱼类的繁殖成功取决于早期生命阶段的生存。每个家长的情况也很重要。为了预测沙丁鱼招聘，我们提出了一个“双阶段”模型的基础上，季节PDO为基础的指数和条件因子。该模型确定夏季有利于一个良好的成人条件的因素，其次是春季产卵季节支持良好的幼虫保留和生长的喂养季节。
We confirm that sardine recruitment in the California Current, during the last three decades, mimics aspects of the environment in the North Pacific indicated by the Pacific Decadal Oscillation (PDO) index. The periods of stock increase and decrease followed consecutive years with positive and negative PDO values, respectively. During the “warm” periods, the average number of recruits per biomass was more than threefold higher than that during the “cold” periods. In addition to the environmental conditions experienced by the sardine larvae, we show that the variability in sardine recruitment is partially explained by the environmental conditions many months before the spawning season and the adult condition factor. We hypothesize that sardine have a metabolic deficit during spawning, so prior good feeding opportunities are necessary to increase both total fecundity and offspring robustness, to enhance both reproduction and survival, respectively. Our findings augment a century-old theory that the reproductive success of small pelagic fish is governed by the survival of the early life stages. The condition of each parent also matters. To predict sardine recruitment, we propose a “dual-phase” model based on seasonal PDObased indices and a condition factor. The model identifies summer feeding seasons conducive to a good adult condition factor followed by spring-spawning seasons supportive of good larval retention and growth.