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首页> 外文期刊>ICES Journal of Marine Science >The effects of bottom temperature and fishing on the structure and composition of an exploited demersal fish assemblage in West Greenland
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The effects of bottom temperature and fishing on the structure and composition of an exploited demersal fish assemblage in West Greenland

机译：底部温度和捕捞对西格陵兰西格林兰剥削的折叠鱼机组合的结构和组成的影响

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摘要

The distribution and abundance of marine fishes have been changing over the last decades due to climate change and overfishing. We evaluated the status of an important exploited marine ecosystem for one of the largest fisheries in Greenland, Greenland halibut Reinhardtius hippoglossoides, in the offshore slopes of West Greenland. We examined how five ecological indicators changed from 1997 to 2019 under the effect of climate and commercial fishery. The oscillatory tendency of the bottom temperature modified the structure and composition of the demersal fish community. In the shallower zone, the warming bottom temperature favoured high trophic level and warmer water species, and subsequently, an increase in halibut biomass, which reduced the biodiversity. In the middle depth zone, the high biomass of halibut masked increases of less common higher trophic level species. In the deep zone, the drastic reduction of halibut biomass coincided with an increase of high trophic level and colder-water species. Despite the increasing exploitation, especially the mid depth zone, the current fishery did not induce changes to community structure. With the present study, we demonstrate the value of using ecological indicators and estimating spatio-temporal trends to provide a further understanding of the ecosystem status.
机译：由于气候变化和过度捕捞，过去几十年的海洋鱼类的分布和丰度已经发生变化。我们评估了一个重要的剥削海洋生态系统的地位，为格陵兰格陵兰格陵兰格林兰雷赫哈德蒂斯河马，在西格陵兰岛海外山坡上。我们在气候和商业渔业的影响下，研究了从1997年到2019年改变了五个生态指标。底部温度的振荡趋势改性了骨折的鱼群的结构和组成。在较浅的区域中，变暖的底部温度有利于高营养水平和较温暖的水物种，随后增加了大叶片生物质的增加，减少了生物多样性。在中间深度区中，大纤维的高生物量掩盖了较少常见的较高营养水平物种的增加。在深处，大纤维生物质的急剧减少恰逢高营养水平和较冷的水物种。尽管剥削程度越来越多，尤其是中深区，目前的渔业没有诱导对社区结构的变化。通过本研究，我们展示了使用生态指标和估算时空趋势的价值，以进一步了解生态系统状态。

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