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A 12-year study of the seasonal and interannual dynamics of mesozooplankton in the Laptev Sea: Significance of salinity regime and life cycle patterns

机译:拉普捷夫海中生浮游动物的季节和年际动态的12年研究:盐度制度和生命周期模式的意义

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Over a 12-year period (1989-2000) the spatial and temporal distribution of zooplankton in the Laptev Sea (Arctic Siberia) has been investigated. A total number of 111 taxa from 10 phyla were found. Sixteen species are reported from this region for the first time. The distribution and abundance of zooplankton on the Laptev Sea shelf is dependent on the main direction of river water spread, which varies between years. While the western and northeastern Laptev Sea shelf is dominated by a marine-neritic fauna, the central part is inhabited by a transitional brackish-marine assemblage. A brackish-neritic community characterizes the eastern and southeastern regions, where lowest salinities usually prevail. Closer to estuaries the summer zooplankton consists of both freshwater and brackish-water species, whereas in winter brackish-water species are dominant. Average zooplankton abundance varies seasonally and interannually, particularly in the southeastern Laptev Sea. The amplitude of these variations mainly depends on the state of the populations of the most common Copepoda species, the intensity of their reproduction, and their success in overwintering. Two seasonal abundance maxima were found, at the end of winter and at the end of summer. During the period of highest reproduction in summer the abundance may be 50 times greater than during overwintering. The average population abundance can vary by the factor of 2 in summer and in winter from year to year.
机译:在十二年期间(1989-2000年),对拉普捷夫海(北极西伯利亚)中浮游动物的时空分布进行了调查。从10个门中总共发现了111个分类单元。该地区首次报告了16种。拉普捷夫海陆架浮游动物的分布和丰度取决于河流水扩散的主要方向,该方向随年份而变化。拉普捷夫海西部和东北海陆架以海生动物为主导,而中部则是过渡性的微咸海洋组合。东部和东南部地区是咸淡的,通常盐度最低。靠近河口的夏季浮游动物由淡水和微咸水种类组成,而在冬季,微咸水种类占主导地位。平均浮游动物的丰度在季节和季节之间变化,特别是在东南拉普捷夫海。这些变化的幅度主要取决于最常见的pe足类物种的种群状况,繁殖强度以及它们越冬的成功程度。在冬季末和夏季末发现了两个季节性丰度最大值。在夏季繁殖最高的时期,丰度可能是越冬时期的50倍。夏季和冬季每年的年平均人口丰度可能相差2倍。

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