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首页> 外文期刊>Marine ecology progress series >Circumpolar patterns in Antarctic krill larval recruitment: an environmentally driven model
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Circumpolar patterns in Antarctic krill larval recruitment: an environmentally driven model

机译：南极磷虾幼体募集的Circ极模式：环境驱动模型

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摘要

Larval recruitment in Antarctic krill is known to be episodic and regional. We consider the importance of a range of recruitment factors using an environmentally driven model of larval development from spawning to post-larvae. Our model examines the timing of spawning, interaction with bathymetry, susceptibility to cold temperatures, temperature-driven development and the seasonal cycle of sea ice to identify those factors with the greatest impact. The model predicts that the seasonal location of sea ice is the main limiting factor for successful larval recruitment. Spawning in January leads to the greatest area of viable larval recruitment habitat. Dense sea ice cover, which we assume that adult krill do not spawn under, prevents spawning in large areas early in the breeding season (December). Nevertheless, later spawning in February, when sea ice is at a minimum, means there is often insufficient time for the larvae to reach a viable developmental stage before the sea ice advances. Meanwhile, although spawning is possible in more northerly areas throughout the breeding season, these are generally remote from winter sea ice, which is assumed to be necessary for larvae to overwinter. Interaction with bathymetry before hatching further limits suitable habitat. Over a 12 yr period, the model predicted larval recruitment from January spawning in all years in the Cooperation, Ross and Weddell Seas, with episodic larval recruitment in the Bransfield Strait in 9 of the 12 years. Additional understanding of the overwintering requirements of larvae, together with regional studies at higher spatial resolution, particularly in shelf regions, will better constrain the uncertainties in the model.
机译：已知南极磷虾的幼体征募是偶发性和区域性的。我们考虑使用环境驱动的幼虫从产卵到后幼虫发育的模型来考虑一系列募集因素的重要性。我们的模型检查了产卵的时间，与测深法的交互作用，对低温的敏感性，温度驱动的发育以及海冰的季节性周期，以确定那些影响最大的因素。该模型预测，海冰的季节性位置是成功募集幼体的主要限制因素。一月份的产卵会导致最大的可行幼体募集栖息地。我们认为成年磷虾不会在下面产卵，因此可以防止在繁殖季节早期（12月）在大面积产卵。然而，随后在2月产卵，此时海冰量最小，这意味着幼虫在海冰前进之前通常没有足够的时间到达可行的发育阶段。同时，尽管在整个繁殖季节都可能在更北部的地区产卵，但这些产卵通常远离冬季海冰，而冬季海冰被认为是幼虫越冬所必需的。孵化前与测深仪的相互作用进一步限制了合适的栖息地。在过去的12年中，该模型预测从合作社，罗斯和韦德海所有年份的1月开始产卵幼虫，而在12年中的9年中，在布兰斯菲尔德海峡采捕偶发性幼虫。对幼虫越冬需求的进一步了解，以及在较高空间分辨率下（尤其是在架子地区）进行的区域研究，将更好地约束模型的不确定性。

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