Ueda, H. & M. Yuasa. (2015). [Community structure and species-specific spatiotemporal distribution of Corycaeidae (Copepoda) in Tosa Bay.]. Kuroshio Science. 8(2):136-147.

364604

Ueda, H. & M. Yuasa

2015

8(2):136-147.

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Community structure, species-specific seasonal abundance and horizontal/vertical distributions of corycaeid copepods, the dominant carnivorous zooplankton, were investigated in Tosa Bay, western Japan. Little is known concerning the ecology of these species. The adult copepods were analyzed in samples collected monthly from discrete layers at three stations, which were lined from near the shore to the shelf edge, by vertical hauls of a 0.1-mm mesh, closing or opening/closing, net from May 2009 to April 2010. A total of 23 species were identified. Ditrichocorycaeus affinis was highly abundant especially in the spring with the highest adult density of 154 ind. m –3 in April, and composed 66% of the yearly mean density of adult corycaeid copepods. This species and the four subdominant species Farranula gibbula, D. andrewsi, Onychocorycaeus pacificus and O. catus showed no species-specific consistent horizontal distribution in the surface layer (0–20 or 0–25 m depth), and their densities sometimes varied widely among the stations, suggesting that they were patchily distributed. At the shelf-edge station, their distribution was primarily limited to a surface layer of <50 or 100 m deep. Among the other species, only Urocorycaeus furcifer showed a higher yearly mean density in the 100–200 m depth than in the shallower depths. The present results of speciesspecific vertical distributions largely agree with those of the previous studies, except for D. affinis, of which the vertical distribution within the 0–100 m layer greatly varied with no notable correlation with environmental factors.

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