Vertical distribution, life cycle and body allometry of two oceanic calanoid copepods (Pleuromamma scutullata and Heterorhabdus tanneri) in the Oyashio region, western North Pacific Ocean
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Diel and seasonal vertical distribution, life cycle and body allometry ofPleuromamma scutullata and Heterorhabdus tanneri were investigated in the Oyashioregion during September 1996 through October 1997. Monthly samples werecollected with 0.1 mm-mesh closing nets towed through five discrete depths betweenthe surface and ≤2000 m. Copepodite stages 1 through 6 of P. scutullata and 3 through6 of H. tanneri were collected effectively with the nets. Day-night samplings duringDecember 1996, April and October 1997 revealed both species ascend at night.Seasonal differences in the vertical distribution patterns of both copepods wereinsignificant, and P. scutullata was distributed much shallower (250-500 m) than H.tanneri (600-850 m). By tracing the sequential changes in abundance peaks of eachcopepodite stage, both species are considered to produce one generation per year. Themain reproduction season was estimated to occur in spring for P. scutullata and in winterfor H. tanneri. The relationships between prosome length and wet weight, dry weight,and ash-free dry weight indicated that the increase in weight per molt was much greaterin H. tanneri than in P. scutullata. These dissimilar features are discussed in relation tothe dissimilar food habits of these two species and production cycle of food organismsin the Oyashio region.
- Oxford University Pressの論文
- 2000-01-01
Oxford University Press | 論文
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