Abstract
Time-series sediment traps were deployed at six mooring sites in the southeastern Beaufort Sea from October 2003 to August 2004 during the cruise of the Canadian research vessel Amundsen within the framework of the Canadian Arctic Shelf Exchange Study (CASES). Trap-collected zooplankton (TCZ) at around 200 m water depth was dominated by copepods accounting for 74–93% of the total abundance throughout the year with increase in abundance at all sites during the fall. Seven distinct TCZ groups were identified through cluster analysis. Two marked seasonal shifts in TCZ composition from late fall to early winter and from spring to early summer were revealed at five sites at 200 m depth. The zooplankton was dominated by Oncaea spp., pteropods, and copepod nauplii in the late fall cluster and in the winter cluster, and by copepod nauplii in the summer cluster. A significant change in water temperature, salinity, and sea ice concentration was observed only with the spring–summer shift. The cluster analysis also revealed that TCZ composition at 200 m at a station located in the Cape Bathurst Polynya was markedly different from those at other sites through the study period by being characterized by the dominance of various copepodite stages of Metridia longa. This was probably due to a less prolonged period of sea ice cover, which provides favorable food conditions for the zooplankton community.
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Acknowledgments
We thank the officers and crew of the CCGS Amundsen for their outstanding help during the Canadian Arctic Shelf Exchange Study (CASES) 2003–2004 expedition. We also thank S. Blondeau, A. Forest, and L. Michaud for their variable help during the expedition. This study was supported by the Grant-in-Aid from the Japan Society for the Promotion of Science to M. Fukuchi (No. 11208203) and H. Sasaki (No. 16510010). This is a contribution to the CASES and the Canada Research Chair on the response of marine arctic ecosystems to climate warming.
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Makabe, R., Hattori, H., Sampei, M. et al. Regional and seasonal variability of zooplankton collected using sediment traps in the southeastern Beaufort Sea, Canadian Arctic. Polar Biol 33, 257–270 (2010). https://doi.org/10.1007/s00300-009-0701-7
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DOI: https://doi.org/10.1007/s00300-009-0701-7