Abstract

The benthic fauna of Sedova Bay (Kara Sea, Novaya Zemlya Archipelago) was studied during two cruises of the R/V Academik Mstislav Keldysh in 2015–2016. Three macrobenthic communities were described. The species composition of the benthic communities is formed by two orthogonal environmental gradients: vertical (depth) and horizontal (the distance from the apex of the bay). Horizontal changes are mainly determined by terrigenous runoff, despite the generally low content of suspended particles in the water column of the bay. This factor determines the trophic conditions for benthic invertebrates and affects the changes in the share of dominant species within one assemblage. An increased effect of this factor results in significant reorganization of bottom communities (disappearance of a number of species, separation of the marginal communities, and fauna depletion) as were described for the neighboring bays on the eastern coast of Novaya Zemlya.

中文翻译：

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塞多瓦湾底部社区（卡拉海（Novaya Zemlya））

摘要

在R / V Academik Mstislav Keldysh的两次巡航中研究了Sedova湾底栖动物区系（Kara Sea，Novaya Zemlya群岛）在2015–2016年。描述了三个大型底栖动物群落。底栖群落的物种组成由两个正交的环境梯度形成：垂直（深度）和水平（距海湾顶点的距离）。尽管海湾水柱中悬浮颗粒的含量通常较低，但水平变化主要由陆源径流决定。这一因素决定了底栖无脊椎动物的营养条件，并影响一个种群内优势物种份额的变化。如Novaya Zemlya东海岸的相邻海湾所描述的，该因素增加的作用导致底部群落的显着重组（许多物种的消失，边缘群落的分离以及动物的消耗）。