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首页> 外文期刊>ICES Journal of Marine Science >Effects of climate and spawning stock structure on the spatial distribution of Northeast Arctic cod larvae
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Effects of climate and spawning stock structure on the spatial distribution of Northeast Arctic cod larvae

机译：气候及产卵结构对东北北极幼虫空间分布的影响

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摘要

The spatial distribution of fish early life stages can impact recruitment at later stages and affect population size and resilience. Northeast Arctic (NEA) cod spawning occurs along the Norwegian coast. Eggs, larvae, and pelagic juveniles drift near-surface towards the Barents Sea nursery area. In this study, a 35-year long time series of NEA cod larvae data was analysed in combination with factors that potentially may affect the distribution of eggs and larvae. These factors included biological aspects of the spawning stock, and environmental variables, such as water temperature, wind, ocean current, and prey abundance. Our aim was to shed light on how these factors influence larval abundance and distribution and how larval abundance and distribution influenced recruitment at age 3. We found that biomass and mean weight of the spawners were positively associated with larval abundance and that a high liver condition index of the spawners was associated with a north-easterly distribution of the larvae. The environmental variables showed generally weak or no correlations with abundance or distribution of larvae. Lastly, we found significant association between larval abundance and year-class abundance at age 3, while the spatial distribution metrics of the larvae, i.e. distribution extent, mean longitude, and mean latitude, showed no significant association with future year-class abundance.
机译：鱼早期生命阶段的空间分布可以影响以后的阶段并影响人口大小和韧性。东北北极（NEA）COD产卵沿着挪威海岸发生。鸡蛋，幼虫和骨盆幼年漂移到近地表朝着巴伦海洋苗圃区域。在这项研究中，与可能影响卵和幼虫分布的因素相结合分析了35年长时间的NEA COD幼虫数据。这些因素包括产卵库存的生物方面，以及环境变量，如水温，风，海洋电流和猎物丰富。我们的宗旨是阐明这些因素如何影响幼虫丰富和分布以及幼虫丰富和分布在3年龄的招生。我们发现产物的生物质和平均重量与幼虫丰度呈正相关，并且高肝脏状况指数产卵者与幼虫的北海分布有关。环境变量通常与幼虫丰富或分布的弱弱或无相关性。最后，我们在3岁时发现了幼虫丰度和年龄丰富之间的重要关联，而幼虫的空间分布度量，即分销范围，平均经度和平均纬度，显示出与未来年级丰富无明显关联。

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