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首页> 外文期刊>Marine biology >Feeding ecology of Greenland halibut and sandeel larvae off West Greenland
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Feeding ecology of Greenland halibut and sandeel larvae off West Greenland

机译：西格陵兰岛外的格陵兰大比目鱼和桑德尔幼虫的饲养生态

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摘要

Feeding ecology of Greenland halibut (Gr. halibut) (Reinhardtius hippoglossoides) and sandeel (Ammodytes sp.) larvae on the West Greenland shelf was studied during the main part of the productive season (May, June and July). Copepods were the main prey item for larval Gr. halibut and sandeel, constituting between 88 and 99% of the ingested prey biomass. For both species, absolute size of preferred prey increased during ontogeny. However, preferred copepod size in relation to larval length differed markedly. In Gr. halibut, the relative size of the prey declined during growth of the larvae, while it remained constant for sandeel at a level of 2.7% of larval length. This led to a reduction in prey niche overlap between the two species. The available prey copepod biomass differed distinctly across the shelf area. In May, the prey density of Gr. halibut was the highest in the off-shelf area in Davis Strait. In June and July, the prey-rich areas for both species were mainly located at the slopes of the banks and at the shelf break area. Gut fullness was higher in these areas than in neighbouring areas, suggesting that the larval food resource could be scarce. The feeding ecology of Gr. halibut and sandeel could explain why larval abundance indices of the two species have historically shown opposite responses to yearly environmental conditions and total zooplankton occurrence.
机译：在生产季节的主要部分（5月，6月和7月），研究了西格陵兰大陆架上的格陵兰大比目鱼（Gr。大比目鱼）（Reinhardtius hippoglossoides）和桑德尔（Ammodytes sp。）幼虫的摄食生态。 pe足类是幼虫Gr的主要猎物。大比目鱼和大e鱼，占摄入猎物生物量的88％至99％。对于这两个物种，在个体发育过程中，首选猎物的绝对大小都会增加。然而，相对于幼体长度，优选的足类的大小差异明显。在Gr。大比目鱼在幼体的生长过程中，其相对大小减小，而对于沙e，其相对大小保持不变，为幼体长度的2.7％。这导致两个物种之间的猎物生态位重叠减少。可用的猎物co足类生物量在整个货架区域上明显不同。 5月，Gr的猎物密度。大比目鱼是戴维斯海峡现成地区中最高的。在6月和7月，这两个物种的猎物丰富区域主要位于河岸的斜坡和架子破损处。这些地区的肠胃饱满度高于周围地区，表明幼虫食物资源可能稀缺。 Gr。的饲养生态。大比目鱼和桑迪尔可以解释为什么这两个物种的幼虫丰度指数在历史上显示出对年度环境条件和浮游动物总数的相反反应。

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