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Community structure and productivity of Arctic benthic fauna across depth gradients during springtime
Deep Sea Research Part I: Oceanographic Research Papers ( IF 2.4 ) Pub Date : 2020-12-13 , DOI: 10.1016/j.dsr.2020.103457
Barbara Oleszczuk , Katarzyna Grzelak , Monika Kędra

Knowledge regarding the benthic community structure (macro- and meiofauna) and its production is crucial for understanding the consequences of ongoing climate change, yet it is still limited, particularly concerning springtime. This is the first study to provide information on the community characteristics and secondary production of macro- and meiofauna collected in the European sector of the Arctic Ocean, along a depth gradient, from shallow Svalbard fjords, the Barents Sea shelf and slope, to the deep Nansen Basin and the Yermak Plateau north off Svalbard. Our results show significant differences in benthic fauna community structure and productivity among fjords, shelf and northern deep stations. Density, biomass, and secondary production decreased significantly with depth, following the decrease in quantity and quality of organic matter reaching the sea floor. Macrofauna was dominated by polychaetes and bivalves, and meiofauna by nematodes. Nematode production was higher than that of macrofauna in areas where no or very limited fresh organic matter was available. We conclude that nematode production in the deep-sea sediments of the Arctic Ocean can be an important component of the benthic communities, and thus carbon cycling, but this relation will likely be influenced by ongoing climate change and related sea ice retreat and, therefore, changes in primary production patterns.



中文翻译:

春季深度梯度上北极底栖动物的群落结构和生产力

有关底栖动物群落结构(大型和中型动物)及其生产的知识对于理解持续的气候变化的后果至关重要,但仍然很有限,尤其是在春季。这是第一项研究,其提供了沿深度梯度从浅斯瓦尔巴特峡湾,巴伦支海陆架和斜坡到深海的北冰洋欧洲地区所收集的大型和中型动物的群落特征和次级生产的信息。斯瓦尔巴特群岛北部的南森盆地和Yermak高原。我们的结果表明,峡湾,陆架和北部深水站底栖动物群落结构和生产力存在显着差异。密度,生物量和次级生产量随着深度的增加而显着降低,随着到达海床的有机物数量和质量的下降。大型动物主要由多毛类和双壳类动物组成,而小型动物主要由线虫类组成。在没有新鲜有机物或有机物非常有限的地区,线虫的产量高于大型动物。我们得出的结论是,北冰洋深海沉积物中的线虫生产可能是底栖生物群落的重要组成部分,因而可能是碳循环的重要组成部分,但是这种关系很可能会受到持续不断的气候变化和相关海冰退缩的影响,因此,初级生产方式的变化。

更新日期:2020-12-13
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