Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality
Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality
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DOI：
10.1139/cjfas-2015-0321
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发表时间：
2016-05
影响因子：
2.4
通讯作者：
Ø. Langangen;Geir Ottersen;L. Ciannelli;F. Vikebø;L. C. Stige
中科院分区：
文献类型：
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作者：
Ø. Langangen;Geir Ottersen;L. Ciannelli;F. Vikebø;L. C. Stige
我们调查如何在洄游性海洋鱼类的生殖策略可能会受到影响的空间变化在生命早期阶段的死亡率。特别是，我们研究产卵时间和地点如何影响后代的生存和生长。巴伦支海鳕鱼（Gadus morhua）的早期生命阶段（卵至1岁）的漂移模型相结合的死亡率在两个不同的生命阶段的空间变化的经验估计。我们研究的季节性和年际差异的生存和生长的后代来自两个产卵场，与中央网站需要更高的迁移距离，因此成本，比北方网站。当占空间明确的死亡率字段，中央和北方产卵的后代有大约相等的生存，早，晚产卵的后代。此外，中央产卵的后代生长更快，很可能达到一个更大的尺寸相比，北方产卵的后代。我们的研究结果表明，南迁的适应性效益在…
We investigate how the reproductive strategy in a migratory marine fish may be influenced by spatial variations in mortality in early life stages. In particular, we examine how spawning time and location affect offspring survival and growth. A drift model for early life stages (eggs to age 1) of the Barents Sea cod (Gadus morhua) is combined with empirical estimates of spatial variation in mortality at two different life stages. We examine seasonal and interannual differences in survival and growth in offspring originating from two spawning grounds, with the central site requiring higher migration distance, and hence cost, than the northern site. When accounting for spatially explicit mortality fields, central and northern spawned offspring have about equal survival, as do early and late spawned offspring. Furthermore, central spawned offspring grow faster and are likely to reach a larger size compared with northern spawned offspring. Our results indicate that the fitness benefit of southward migration in...