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Free Content Species Compositions of the Caprellidea (Crustacea: Amphipoda) of the Sargassum Zone on the Pacific Coast of Japan

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The caprellid fauna of the Sargassum zone was differentiated by sampling locality and algal length. The study was conducted in a small inlet with a rocky shore on the east coast of central Japan. Caprella danilevskii, C. brevirostris, and C. penantis abounded in the exposed area, C. okadai and Caprella sp. III were the dominant species of the sheltered area, while C. tsugarensis was collected from both areas. The difference of caprellid fauna between both areas was principally caused by the wave exposure. Caprella danilevskii, C. okadai and C. tsugarensis were abundant on the large algae (>10 cm), C. brevirostris and Caprella sp. III were abundant on the small algae (<10 cm), while C. penantis showed no algal length preference. The algal community was usually divided into four groups on the basis of species compositions of the Caprellidea; the coralline algae of the exposed area, the Sargassum spp. of the same area, the coralline algae of the sheltered area and Sargassum spp., Cladophora wrightiana and Gelidium amansii of the same area. In summer, the algae of the exposed area were not divided into two groups, because the Sargassum spp., as well as the coralline algae, were short in length. Each caprellid species is morphologically adapted to hold the thallui of the algae which it inhabits. The preference of caprellid fauna for different algal lengths has thus been proven.

Document Type: Research Article

Publication date: 1987-09-01

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