Abstract

The fauna of benthic foraminifers from the northern Laptev Sea has been analyzed to identify the relationship between the distribution of benthic foraminifers and environmental conditions in the eastern and western parts of the sea. The abundance of benthic foraminifer tests in the Laptev Sea is universally low, no more than 3–9 ind./g. Greater foraminifer abundances were found in the west, on the shelf of the Vilkitsky Strait. Foraminifers with agglutinated tests were dominant, 77–100%. In the east, the assemblages consisted almost entirely of agglutinated tests (90–100%). Calcareous Melonis barleeanus was common, up to 10–15%, on the shelf and the continental slope in the western part of the sea. Small specimens of the polar planktic species Neogloboquadrina pachyderma sin occurred. In one sample at an abyssal water depth of 2996 m, the abundance of its tests increased to 302 ind./g; the assemblage was composed predominantly of N. pachyderma sin., both small (juvenile) and large (adult) individuals with good preservation. The massive presence of the polar species N. pachyderma sin. at an abyssal depth in the eastern region indicates the dominant influence of Arctic waters there.

中文翻译：

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拉普捷夫海底栖有孔虫及其与海洋水文条件的关系

摘要

对来自拉普捷夫海北部的底栖有孔虫动物群进行了分析，以确定底栖有孔虫的分布与海洋东部和西部的环境条件之间的关系。拉普捷夫海底栖有孔虫试验的丰度普遍较低，不超过 3-9 工业/克。在西部的维尔基茨基海峡大陆架上发现了更多的有孔虫。具有凝集试验的有孔虫占优势，77-100%。在东部，组合几乎完全由凝集试验组成（90-100%）。钙质甜瓜常见，高达10%～15%，分布于西海陆架和大陆坡。极地浮游物种Neogloboquadrina pachyderma 的小标本罪恶发生了。在深水深度为 2996 m 的一个样本中，其测试丰度增加到 302 ind./g；该组合主要由N. pachyderma sin. 组成，包括保存良好的小型（幼年）和大型（成年）个体。极地物种厚皮猪笼草的大量存在。在东部地区的深海深度表明那里北极水域的主要影响。