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首页> 外文期刊>ICES Journal of Marine Science >Modelling the influence of daytime distribution on the transport of two sympatric krill species (Thysanoessa raschii and Meganyctiphanes norvegica) in the Gulf of St Lawrence,eastern Canada
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Modelling the influence of daytime distribution on the transport of two sympatric krill species (Thysanoessa raschii and Meganyctiphanes norvegica) in the Gulf of St Lawrence,eastern Canada

机译：模拟白天分布对加拿大东部圣劳伦斯湾两种同养磷虾种类（Thysanoessa raschii和Meganyctiphanes norvegica）的运输的影响

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摘要

The Gulf of St Lawrence (GSL) provides several species of North Atlantic baleen whale with an abundant supply of krill, dominated by Thysanoessa raschii and Meganyctiphanes norvegica. We aimed to quantify the differences in upstream advection resulting from the interaction between the circulation and the specific diel vertical migration of T. raschii and M. norvegica at the scale of the northwest GSL We coupled a regional circulation model with Lagrangian models where the daytime depth followed specific functions of surface salinity. Our results help to explain the spatio-temporal variability in both T. raschii and M. norvegica distributions. We identified in particular spatio-temporal patterns in krill upstream transport. During summer and autumn, the upstream transport of krill is steady across Jacques Cartier Strait, limited across Honguedo Strait, and more sporadic across the Estuary mouth. We estimated that the upstream advection of krill particles across the Estuary mouth would be higher by 16-17% for the T. raschii than for the M. norvegica daytime behaviour. Our results also suggest that the advective processes operating on the adults during the productive season are not the only cause for the observed magnitude of the interannual and interspecific variability in krill abundance.
机译：圣劳伦斯湾（GSL）为北大西洋的鲸鱼提供了丰富的磷虾供应，其中以Thysanoessa raschii和Meganyctiphanes norvegica为主。我们的目标是在西北GSL规模上量化由T. raschii和M. norvegica的循环与特定diel垂直迁移之间的相互作用引起的上游对流平流的差异，我们将区域循环模型与Lagrangian模型耦合，其中白天深度遵循表面盐度的特定功能。我们的结果有助于解释T. raschii和M. norvegica分布的时空变异性。我们在磷虾上游运输中发现了特别的时空格局。在夏季和秋季，磷虾的上游运输在雅克·卡蒂埃海峡（Jacques Cartier Strait）内稳定，在洪格多海峡（Honguedo Strait）内有限，而在河口的散布则更为零星。我们估计，磷虾颗粒在河口的上游平流将比罗氏沼虾的白天行为高16-17％。我们的结果还表明，在生产季节对成年虾进行的对流过程不是磷虾丰度年际和种间变异程度的唯一原因。

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