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- W1488587626 abstract "Data on zooplankton in the eastern Bering Sea are presented. The samples were collected and processed by planktonologists of Pacific Fish. Res. Center (TINRO) aboard the U.S.A. research vessels in the summer-autumn of 2003-2011. The period is divided on the basis of bottom temperature, SST, and sea ice cover to (2003-2006) and (2007-2011) years. The shift from warm to cold regime caused increasing of total zooplankton abundance, in particularly offshore where it became higher in more than three times, exclusively because of the large-sized faction growth which included mainly chaetognaths Sagitta elegans (49-52 % of its biomass), copepods Calanus marshallae (39 %) and Eucalanus bungii (26 %) Abundance of euphausiids, mysids, and hyperiid pteropods increased, as well, but the decapods (crabs and shrimps larvae) and coelenterates abundance decreased. Vast area with heightened biomass of the large-sized zooplankton, mostly chaetognaths and copepods, formed in the southern part of the shelf, including the coastal zone; besides, dense concentrations of euphausiids and amphipods were observed locally in the cold years. Biomass of the main large-sized species, as Calanus marshallae, Neocalanus flemingeri, N. cristatus, Eucalanus bungii, Thysanoessa raschii, Themisto libellula, Limacina helicina, Sagitta elegans increased significantly in the cold years, though this increasing went by different ways in different areas. However, abundance and spatial distribution of small-sized and medium-sized zooplankton almost had no changed between the warm and cold years, though some changes in its species structure occurred: the dominance of Pseudocalanus newmani changed for Oithona similis and abundance of neritic species (Centropages abdominalis, Eurytemora herdmani, Acartia longiremis, cladocerans, and meroplankton: larvae of Cirripedia, Bivalvia and Polychaeta) became lower, down to almost disappearance in 2011. A new species -the hyperiid Themisto libellula appeared in the plankton of both eastern and western parts of the Bering Sea after the regime shift, with a certain lag: it penetrated to the eastern Bering Sea with cold waters from the north. It seems that this species reacts to new warming earlier than other ones: it vanishes immediately with stopping of the cold waters propagation, so it practically disappeared from the plankton and fish diet in 2011, although other cold-water species still did not had any visible changes. Apparently, the end of the cold period could be expected in 2012, but there is rather difficult to predict the changes in the plankton community." @default.
- W1488587626 created "2016-06-24" @default.
- W1488587626 creator A5055278631 @default.
- W1488587626 date "2012-01-01" @default.
- W1488587626 modified "2023-09-28" @default.
- W1488587626 title "Результаты исследований зоопланктона Берингова моря по программе NPAFC (экспедиция basis). Часть 1. Восточные районы" @default.
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