Abstract
The species composition of Arctic zooplankton differs greatly from that of the zooplankton of the North Pacific and Bering Sea. Particularly with greater warming from sea-ice retreat, the reproduction of North Pacific species transported into the Chukchi Sea and beyond may lead to changes in the Arctic pelagic ecosystem. We report the egg production and hatching of the Pacific copepod Neocalanus flemingeri in the Chukchi Sea based on shipboard experiments performed in September 2013. The reproductive capability of N. flemingeri observed in the Chukchi Sea resembled that reported in the Pacific, with the exception of a lower hatching success. Only 7.5 % of N. flemingeri eggs hatched compared with 93 % in Pacific experiments. Low hatching success is considered to be caused by failures of fertilization. The potential recruitment number for N. flemingeri suggests that it is unlikely to establish expatriate Arctic populations in the near future.
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Acknowledgments
We are grateful to the captain, officers and crew of the R.V. Mirai (JAMSTEC), operated by GODI, for their help in the sample collection. This study was supported by the Green Network of Excellence Program’s (GRENE Program) Arctic Climate Change Research Project: ‘Rapid Change of the Arctic Climate System and its Global Influences.’ This study was partially supported by a Grant-in-Aid for Scientific Research (A) (24248032) and a Grant-in-Aid for Scientific Research on Innovative Areas (24110005) from the JSPS.
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Matsuno, K., Yamaguchi, A., Hirawake, T. et al. Reproductive success of Pacific copepods in the Arctic Ocean and the possibility of changes in the Arctic ecosystem. Polar Biol 38, 1075–1079 (2015). https://doi.org/10.1007/s00300-015-1658-3
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DOI: https://doi.org/10.1007/s00300-015-1658-3