Winter zooplankton of the Greenland and Barents Seas: a comparison of assemblages and assessment of environmental impact

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Composition, diversity and distribution of zooplankton were studied in Fram Strait and in the southern Barents Sea during the winter period. Multivariate analysis revealed a clear separation of the sampling stations based on oceanographic, bathymetric, and food conditions. Two types of zooplankton assemblages were delineated and these corresponded to the two study regions. Copepods dominated by abundance and biomass. Generalized linear models showed a close relationship of the abundance of common zooplankton groups and diversity indices with mean water temperature, salinity, depth, and chlorophyll a concentration. An increase in the proportion of boreal species and in the total biomass suggested Atlantification of marine Arctic zooplankton communities as well as positive impact of warming on the zooplankton development.

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V. Dvoretsky

Murmansk Marine Biological Institute of the Russian Academy of Sciences

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Email: v-dvoretsky@yandex.ru
俄罗斯联邦, 17 Vladimirskaya Str., Murmansk, 183038

A. Dvoretsky

Murmansk Marine Biological Institute of the Russian Academy of Sciences

Email: v-dvoretsky@yandex.ru
俄罗斯联邦, 17 Vladimirskaya Str., Murmansk, 183038

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2. Fig. 1. Map of zooplankton sampling stations in the Greenland and Barents Seas in winter 2021. Dashed lines indicate warm Atlantic water flows.

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3. Fig. 2. Results of the principal component (PC) ordination method showing the division of stations by environmental and geographical factors in the Greenland and Barents Seas in winter 2021.

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4. Fig. 3. Dendrogram of station similarity (Bray–Curtis coefficient, %) for zooplankton abundance in the Greenland Sea (group 1) and the Barents Sea (group 2) in winter 2021.

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