Distribution of <i>Donax semigranosus</i> and Other Bivalves in Sandy Shore Swash Zones along the Japan Sea Coast of Honshu

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  • Takada Yoshitake
    Japan Sea National Fisheries Research Institute, Fisheries Research Agency
  • Kajihara Naoto
    National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency
  • Abe Shinichiro
    Japan Sea National Fisheries Research Institute, Fisheries Research Agency
  • Iseki Tomoaki
    Japan Sea National Fisheries Research Institute, Fisheries Research Agency
  • Yagi Yuta
    Japan Sea National Fisheries Research Institute, Fisheries Research Agency
  • Sawada Hideki
    Maizuru Fisheries Research Station, Kyoto University
  • Saito Hajime
    Fisheries Research Agency
  • Mochizuki Shota
    Graduate School of Science and Technology, Niigata University
  • Murakami Takuhiko
    Graduate School of Science and Technology, Niigata University

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Other Title
  • 本州日本海沿岸の砂浜汀線域におけるフジノハナガイと他の二枚貝類の分布
  • Distribution of Donax semigranosus and Other Bivalves in Sandy Shore Swash Zones along the Japan Sea Coast of Honshu

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Description

In order to determine the influence of environmental factors on the distribution patterns of sandy shore swash zone bivalves, especially Donax semigranosus, 59 sandy shore sites were examined along the Japan Sea coast of Honshu. In total, 664 individuals of 12 bivalve species were obtained using core samplers. Among them, D. semigranosus was the most dominant species (86.6%). Bivalves were sampled at 24 sites, and D. semigranosus was observed at 16 sites. Multivariate regression models were applied to explain the presence (or absence) of all bivalves, the number of bivalve species, the presence (or absence) of D. semigranosus, and the abundance of D. semigranosus. As explanatory variables, 13 environmental factors were used for the analyses. Minimizing AIC for each regression model enabled identification of the critical environmental factors. In the range of this study, effects of the length of the sandy shore and salinity were detected in all four models. Several additional factors were included in each model. Anthropogenic factors such as the presence of artificial shore protection and the resulting fragmentation of the sandy shore habitat were predicted to negatively affect the presence and diversity of the shore bivalves. Different sets of critical factors were detected for the presence/absence model and the abundance model for D. semigranosus. Considering that most of the reproductive individuals in the D. semigranosus population are one year old, critical assessment of the environmental factors relating to recruitment and subsequent survival processes are important for the stable existence of the population.

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