Zooplankton of the Eastern Kara Sea: Response to a Short Ice-Free Period

IF 1.3 4区地球科学 Q4 OCEANOGRAPHY

Oceanology Pub Date : 2024-03-01 DOI:10.1134/s0001437023070020

A. V. Drits, A. F. Pasternak, E. G. Arashkevich, A. B. Amelina, T. A. Shchuka, M. V. Flint

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Abstract—

A characteristic feature of the eastern Kara Sea, which is separated from its central part by the shallow Central Kara Rise, is a later ice breakup, a shorter ice-free period, and lower water temperature. Zooplankton in this part of the sea is virtually unstudied. The first data on the composition, spatial distribution of zooplankton, age structure and feeding of the dominant species, and their grazing impact on phytoplankton were obtained in the cruise 125 of the R/V Professor Shtokman (September 2013) and cruise 63 of the R/V Akademik Mstislav Keldysh (September 2015) to the eastern Kara Sea. 2015 was a typical year in terms of the ice regime for this region, while in 2013, seasonal ice coverage lasted longer than usual. Zooplankton biomass (17–112 mg dry weight m^–3), to which copepods Calanus glacialis contributed the main portion, were close to the values in the central Kara Sea in September. The seasonal development of the C. glacialis population began much later than in the central Kara Sea, but development of Metridia longa was not influenced by the specifics of the ice regime and hydrophysical conditions in the eastern Kara Sea. The interannual differences in the timing of ice retreat had almost no effect on the zooplankton abundance, seasonal development of the dominant copepod populations, feeding activity, and grazing impact on phytoplankton.

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东喀拉海浮游动物：对短暂无冰期的反应

摘要卡拉海东部与中部被浅海卡拉海隆分隔开来，其特点是破冰较晚，无冰期较短，水温较低。这部分海域的浮游动物几乎没有得到研究。关于浮游动物的组成、空间分布、年龄结构和主要物种的摄食情况，以及它们对浮游植物的掠食影响的首批数据，是在 "什托克曼教授号 "考察船第 125 航次（2013 年 9 月）和 "阿卡德米克-姆斯蒂斯拉夫-凯尔迪什号 "考察船第 63 航次（2015 年 9 月）前往喀拉海东部考察时获得的。2015 年是这一地区冰情的典型年份，而 2013 年的季节性冰覆盖持续时间比往年长。浮游动物生物量（17-112 毫克干重 m-3），其中主要是桡足类冰川桡足类（Calanus glacialis），接近喀拉海中部 9 月份的数值。冰河桡足类种群的季节性发育开始时间比喀拉海中部晚得多，但长栉水母的发育不受喀拉海东部冰情和水文物理条件具体情况的影响。冰退时间的年际差异对浮游动物的丰度、主要桡足类种群的季节性发展、摄食活动以及对浮游植物的捕食影响几乎没有影响。

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来源期刊

Oceanology 地学-海洋学

CiteScore

2.00

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Oceanology, founded in 1961, is the leading journal in all areas of the marine sciences. It publishes original papers in all fields of theoretical and experimental research in physical, chemical, biological, geological, and technical oceanology. The journal also offers reviews and information about conferences, symposia, cruises, and other events of interest to the oceanographic community.