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Pelagic fish and zooplankton species assemblages in relation to water mass characteristics in the northern Bering and southeast Chukchi seas
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Pelagic fish and zooplankton species assemblages in relation to water mass characteristics in the northern Bering and southeast Chukchi seas
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Journal Article
Pelagic fish and zooplankton species assemblages in relation to water mass characteristics in the northern Bering and southeast Chukchi seas
2013
Overview
This research explores the distributions and community composition of pelagic species in the sub-Arctic and Arctic waters of the northern Bering and central and southern Chukchi seas during September 2007 by linking pelagic zooplankton and fish assemblages to water masses. Juvenile saffron cod (
Eleginus gracilis
), polar cod (
Boreogadus saida
), and shorthorn sculpin (
Myoxocephalus scorpius
) were most abundant in warm, low salinity Alaska Coastal Water (ACW) of the central Chukchi Sea, characterized by low chlorophyll, low nutrients, and small zooplankton taxa. Adult Pacific herring (
Clupea pallasii
) were more abundant in the less stratified Bering Strait waters and in the colder, saltier Bering Shelf Water of the northern Bering and southern Chukchi seas, characterized by high chlorophyll, high nutrients, and larger zooplankton taxa. Juvenile pink (
Oncorhynchus gorbuscha
) and chum (
O. keta
) salmon were most abundant in the less stratified ACW in the central Chukchi Sea and Bering Strait. Abundances of large zooplankton were dominated by copepods (
Eucalanus bungii, Calanus glacialis/marshallae, Metridia pacifica)
followed by euphausiids (juvenile
Thysanoessa raschii
and unidentified taxa), whereas small zooplankton were dominated by bivalve larvae and copepods (
Centropages abdominalis
,
Oithona similis
,
Pseudocalanus
sp.). Pelagic community composition was related to environmental factors, with highest correlations between bottom salinity and large zooplankton taxa, and latitude and fish species. These data were collected in a year with strong northward retreat of summer sea ice and therefore provide a baseline for assessing the effects of future climate warming on pelagic ecosystems in sub-Arctic and Arctic regions.
Publisher
Springer-Verlag,Springer,Springer Nature B.V
Subject
