Long-Term Investigation of Spatio-Temporal Variations in Faunal Composition and Species Richness of Megabenthos in Ise Bay, Central Japan

Authors: Ganmanee, Monthon1; Narita, Teruyoshi1; Sekiguchi, Hideo2

Source: Journal of Oceanography, Volume 60, Number 6, November 2004 , pp. 1071-1083(13)

Publisher: Springer

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Based on our long-term data from megabenthos sampling from 1993 to 2002 in Ise Bay, central Japan, we examined spatio-temporal variations in taxon composition, species richness and its distribution of megabenthos in the bay in relation to the occurrence of the oxygen-poor water (i.e. oxygen content less than 3 ppm) in bottom waters of the bay. A total of 261 species were identified including 6 cnidarians, 1 tentaculate, 5 annelids, 71 molluscs, 72 crustaceans, 16 echinoderms, 12 urochordates and 78 pisces. Of the most abundant 10 megabenthos species, the following 4 species of echinoderms made up more than the half of megabenthos biomass: Luidia quinaria, Echinocardium cordatum, Asterias amurensis and Astropecten scoparius. Species richness of megabenthos varied significantly between seasons and among stations. The severity and period of occurrence of the oxygen-poor water developing every summer play an important role in determining spatial distributions of species richness in the bay.

Keywords: Ise Bay; Spatio-temporal variations; faunal composition; megabenthos; oxygen-poor water; species richness

Document Type: Research Article

DOI: http://dx.doi.org/10.1007/s10872-005-0015-5

Affiliations: 1: Faculty of Bioresources, Mie University, 1515 Kamihama-cho, Tsu, Mie, 514-8507, Japan, 2: Faculty of Bioresources, Mie University, 1515 Kamihama-cho, Tsu, Mie, 514-8507, Japan, Email: sekiguch@bio.mie-u.ac.jp

Publication date: November 1, 2004

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