Quantitative Distribution and Lipid Reserves of the Calanus euxinus (Copepoda) Population in the Black Sea in Late Autumn 2017

IF 1.3 4区地球科学 Q4 OCEANOGRAPHY

Oceanology Pub Date : 2024-07-02 DOI:10.1134/s0001437024700073

E. S. Hubareva, B. E. Anninsky

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Abstract—

The field data on the abundance, biomass, age structure, and lipid reserves of the copepod Сalanus euxinus population in deep pelagial and Crimean shelf regions of the Black Sea in November 2017 were analyzed. The abundance and biomass of this species in deep areas (10.2 ± 0.5 × 10³ ind./m² and 7.3 ± 0.5 g/m², respectively) were similar to the average annual values for seasons with moderate development of planktivorous jellyfish populations. The average abundance and biomass of the copepods were similar to analogous 2016 values when the jellyfish abundance was twice as low. However, in 2017, the denser aggregations of C. euxinus (12.8 ± 1.0 × 10³ ind./m² and 9.8 ± 0.5 g/m²) were found in the central parts of cyclonic circulations, while in 2016, they were recorded more frequently at the peripheries of cyclonic gyres. A structure of the C. euxinus population also changed. In November 2017, the percentage of copepodites I–IV, females and males, increased, whereas the proportion of copepodites V reduced. These changes likely resulted from a later sampling period in 2017, when the C. euxinus population was ready for active reproduction. Sufficient amounts of lipids in copepodites V, decreased oil sac volumes in females, and increased abundance of males in anticyclonic regions are indicative of more favorable trophic conditions for this part of the C. euxinus population and its higher maturity.

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2017年深秋黑海桡足类(Calanus euxinus)种群的定量分布和脂质储备

摘要--分析了2017年11月黑海深海水层和克里米亚大陆架地区桡足类Сalanus euxinus种群的丰度、生物量、年龄结构和脂质储备的野外数据。该物种在深海区域的丰度和生物量（分别为10.2 ± 0.5 × 103 ind./m2和7.3 ± 0.5 g/m2）与浮游水母种群适度发展季节的年平均值相似。桡足类的平均丰度和生物量与 2016 年的类似值相似，当时水母的丰度是 2016 年的两倍。然而，2017 年，在气旋环流的中心部分发现了更密集的 C. euxinus 聚集（12.8 ± 1.0 × 103 ind./m2 和 9.8 ± 0.5 g/m2），而在 2016 年，它们更频繁地出现在气旋环流的外围。鳕鱼种群结构也发生了变化。2017 年 11 月，桡足类 I-IV（雌性和雄性）的比例上升，而桡足类 V 的比例下降。这些变化很可能是由于2017年采样时间较晚造成的，当时C. euxinus种群已准备好进行活跃繁殖。第五号桡足类含有充足的脂质、雌性油囊体积减少以及反气旋区域雄性桡足类数量增加，表明这部分桡足类种群的营养条件更加有利，成熟度更高。

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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.