DISTRIBUTION OF MARINE CLADOCERANS IN THE NORTHERN BERING SEA AND THE CHUKCHI SEA (17th Symposium on Polar Biology)
スポンサーリンク
概要
- 論文の詳細を見る
Distribution and abundance of marine cladocerans were studied in the northern Bering Sea and the Chukchi Sea during the period from July to October in 1988-1990. Two species of marine onychopod cladocerans belonging to Podonidae, Evadne nordmanni LOVEN and Podon leuckarti G. O. SARS, were detected in both seas at varying densities during this period. In particular, at stations located in eastern Bering Strait, maximum densities of 912 indiv・m^<-3> for E. nordmanni and 1725 indiv・m^<-3> for P. leuckarti were recorded in July 1989. In addition, a few specimens of the marine ctenopod species belonging to Sididae, Penilia avirostris DANA, and a single specimen of the freshwater anomopod species belonging to Moinidae, Moina sp., were collected at the easternmost nearshore station in Bering Strait only once, in July 1989. This appears to be the northernmost record for P. avirostris. Abundances of cladocerans were higher in July-August than in September-October, all species preferring less saline, chlorophyll-rich, warmer waters than colder waters of higher salinity. In both podonid species, gamogenetic individuals were found together with more prevalent parthenogenetic females. Proportions of gamogenetic individuals were less pronounced in July-August, but increased in September and October, sometimes surpassing 86% of the whole population, beyond the proportion recorded in mid-latitudinal populations in the Atlantic and the Pacific waters. The resting egg production is considered as an effective life-history strategy for the maintenance and survival of populations of E. nordmanni and P. leuckarti in these boreal and polar seas.
- 国立極地研究所の論文
著者
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Hattori Hiroshi
Department of Biological Science and Engineering, Tokai University, Minami-sawa, Minami-ku, Sapporo
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Fukuchi Mitsuo
National Institute of Polar Research, 10-3 Midori-cho, Tachikawa-shi, Tokyo 190-8518, Japan
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Sasaki Hiroshi
Department of Biological Technology, Faculty of Science and Engineering,Senshu University of Ishinom
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MATSUDA Osamu
Faculty of Applied Biological Science, Hiroshima University
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TANIMURA Atsushi
National Institute of Polar Research
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Fukuchi M
National Institute Of Polar Research
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ONBE Takashi
Faculty of Applied Biological Science, Hiroshima University
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Onbe Takashi
Faculty Of Applied Biological Science Hiroshima University
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Sasaki Horoshi
Faculty of Agriculture, Tohoku University
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Matsuda O
Hiroshima Univ. Higashi‐hiroshima Jpn
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Matsuda Osamu
Faculty Of Applied Biological Science Hiroshima University
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Matsuda O
Research Center Sony Corporation
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Fukuchi M
National Inst. Polar Res. Tokyo
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Fukuchi Mitsuo
National Inst. Of Polar Res. Kaga Tokyo 173-8515 Jpn
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Hattori H
Department Of Marine Sciences And Technology School Of Engineering Hokkaido Tokai University
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Satoh Hiroo
Department Of Biological Technology Faculty Of Science And Engineering Senshu University Of Ishinoma
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Satoh Hiroo
Department Of Biological Technology Faculty Of Science And Engineering Senshu University Of Ishinoma
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Tanimura A
Kyoto Prefectural Univ. Kyoto Jpn
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Hattori Hiroshi
Department Of Biological Science And Engineering Tokai University Minami-sawa Minami-ku Sapporo 005-
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Matsuda Osamu
Sony Corporation Research Center
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Fukuchi Mitsuo
National Inst. Of Polar Res. 10-3 Midori-cho Tachikawa Tokyo 190-8518 Jpn
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Sasaki Hiroshi
Department Of Agricultural Chemistry Faculty Of Agriculture Hokkaido University
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Sasaki Hiroshi
Faculty Of Agriculture Tolioku University:(present Address)department Of Biotechnology Senshu University Of Ishinomaki
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Tanimura Atsushi
National Institute of Polar Resarch
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- ACKNOWLEDGMENTS
- OBSERVATION HUT
- FREQUENCY OF OBSERVATION
- PREFACE
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