Abstract
An investigation was conducted to examine the species composition, abundance and biomass of benthic macrofaunal invertebrates in Oppa Bay, Miyagi Prefecture, Japan, in August 1984. Among 212 species identified, nearly half (105) were Polychaetes. Usually five species, Ampharete sp. 1, Neosabellides sp. 1, Nephtys polybranchia, Chaetozone sp. 1, and Lumbrineris longifolia were numerically dominant. The faunal features of dominant species were clearly divided into two areas using two indicator species, Amphalete sp. 1 and Neosabellides sp. 1. The former species decreased in numbers in the area from the river to the bay mouth, while the latter increased. Sediments consisted of sand at the river mouth and in the northern bay; and of silt-clay in the central bay, bay mouth and southern part of the bay. Gradients of species diversity (H′) were expressed as a function of distance by linear regression. The relationship was positive (r=0.812) from the river to the bay mouth accompanied by increasing depth; and negative (r=-0.906) from northern to southern parts of the bay in proportion to the increase of silt-clay in sediments.
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Communicated by M. Anraku, Tokyo
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Ishikawa, K. Relationship between bottom characteristics and benthic organisms in the shallow water of Oppa Bay, Miyagi. Mar. Biol. 102, 265–273 (1989). https://doi.org/10.1007/BF00428288
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DOI: https://doi.org/10.1007/BF00428288