Abstract

The benthic fauna of Oga Bay (Kara Sea, Novaya Zemlya archipelago) was studied in 2015–2016 during the R/V Akademik Mstislav Keldysh expeditions. Five grab stations at depths of 70–140 m were sampled (three grabs per station). Three macrobenthic communities consecutively replacing each other from the inner near-glacier part of the bay toward the outer slope were revealed. Concentration of suspended matter in the water column and in the near-bottom layer, caused by powerful sedimentation from the Goluboi (Oga) glacier was the main factor determining the macrobenthic communities distribution. An overall decrease in abundance, biomass and diversity of macrofauna was found in the area of glacier discharge. The community dominated by bivalve Portlandia arctica inhabits the main part of the bay. The peculiarities of the benthic communities of the Arctic glacial bays and fjords are discussed.

中文翻译：

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奥加湾底栖动物群

摘要

在R / V Akademik Mstislav Keldysh探险期间，于2015–2016年对Oga湾底栖动物区系（卡拉海，新地亚群岛）进行了研究。采样了70-140 m深度的五个抓取站（每个站三个抓取点）。从海湾的内部近冰川部分到外部斜坡，三个大型底栖动物群落相互替换。Goluboi（Oga）冰川强大的沉降作用引起的水柱和近底层悬浮物的浓度是决定大型底栖动物群落分布的主要因素。在冰川排放区域，大型动物的丰度，生物量和多样性总体下降。双壳类Portlandia arctica主导的社区居住在海湾的主要部分。讨论了北极冰川湾和峡湾底栖群落的特殊性。