The reproductive biology of Euchaeta antarctica Giesbrecht (Copepoda: Calanoida) at South Georgia |
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| Affiliation: | 1. State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China;2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Beijing, China;3. Ocean College, Zhejiang University, Zhoushan, China;4. School of Marine Sciences, University of Maine, Orono, ME, United States of America;1. Laboratory of Molecular Neurobiology, Graduate School of Biostudies, Kyoto University, Japan;2. Laboratory of Molecular Neurobiology, Graduate School of Pharmaceutical Sciences, Kyoto University, Japan;1. Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan;2. Central Fisheries Research Institute, Hokkaido Research Organization, Yoichi, Hokkaido 046-8555, Japan;3. Fisheries Research Institute, Aomori Prefectural Industrial Technology Research Center, Hiranai, Aomori 039-3381, Japan;4. Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Kushiro, Hokkaido 085-0802, Japan;5. Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Goto, Nagasaki 853-0508, Japan;6. Akkeshi Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Akkeshi, Hokkaido 088-1113, Japan;7. National Scientific Center of Marine Biology, Far East Branch, Russian Academy of Sciences, Vladivostok 690041, Russia;8. Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Hatsukaichi, Hiroshima 739-0452, Japan |
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| Abstract: | The reproductive biology of the predatory calanoid copepod Euchaeta antarctica Giesbrecht was investigated in two interconnected fjord systems at South Georgia. Counts of the number of spermatophores attached to adult females and the number of egg sacs encountered, indicated probable peaks of reproduction in summer and winter. Patterns of spermatophore placement were examined and compared with data for E. norvegica (Boeck) from boreal waters. Elemental analysis indicated a high proportion of carbon and a low proportion of nitrogen in adult females and egg sacs from both sites.High winter carbon levels in adults seem related to their predatory feeding habits allowing high food intake throughout the year whereas in egg sacs it probably reflects extended development times and/or non-feeding naupliar stages.Mean adult female and egg clutch dry weights were higher in Cumberland East Bay during winter than in Moraine Fjord during summer. These differences are discussed in the context of relationships between fjord morphology and production levels. |
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