Geographical Variations in Prosome Length and Body Weight of Neocalanus Copepods in the North Pacific |
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Authors: | Toru Kobari Kazuaki Tadokoro Akihiro Shiomoto Shinji Hashimoto |
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Affiliation: | (1) Faculty of Fisheries, Kagoshima University, Shimoarata, Kagoshima 890-0056, Japan;(2) Frontier Research System for Global Change, Syowa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan;(3) National Fisheries Research Institute of Far Seas Fisheries, Orido, Shimizu, Shizuoka 424-8633, Japan;(4) Hydrospheric Atmospheric Research Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan |
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Abstract: | Geographical variations in prosome length and body weight of Neocalanus copepods (N. cristatus, N. plumchrus and N. flemingeri) were investigated on samples from North-South and East-West transects in the North Pacific during spring to early summer
in 1998 and 1999. Southward and eastward increasing patterns were pronounced for water temperature, although no significant
pattern was observed for chlorophyll a concentrations. All Neocalanus species showed large geographical variations in prosome length and body weight, being smaller in the southern and eastern
waters. Comparing the relationship between prosome length and body weight, large deviations (lower body weight at a given
prosome length) were evident for the eastern specimens of N. cristatus and N. plumchrus. In stepwise regression analysis, the geographical variations of prosome length and body weight revealed a significantly
negative correlation with temperature variations. These results suggest that temperature is a more important environmental
factor than chlorophyll a concentration in its effect on geographical variations in prosome length and body weight of Neocalanus copepods in the North Pacific.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Copepod prosome length body weight temperature chlorophyll a concentration subarctic |
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