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Seasonal and vertical variation of the boulder shore fauna in amakusa



Seasonal and vertical variation of the boulder shore fauna in amakusa



Publications from the Amakusa Marine Biological Laboratory Kyushu University 11(1): 1-18



Seasonal and vertical variations of the community structure in the boulder shore of Amakusa were studied by seasonal quantitative quadrat samplings in 1987-1988. Mobile molluscs were dominant in all sesaons. They were clustered in three groups based on the tide level. The diveristy index H' and the evenness index J' were calculated. They showed little seasonal variation. However, the abundance or the distribution area of some species varied seasonally. The number of Notoacmea teramachii and N. concinna radula increased in spring and that of Lunella coronata increased in winter. These fluctuations in number were caused by the seasonal pulse of recruitment. Littorina brevicula extended its distribution area downward in winter and the peak density of Monodonta labio shifted to different tide levels seasonally. These two species showed seasonal migration. It is concluded that in the boulder shore of Amakusa, the recruitment and migration are the major causative factors of the seasonal variation.

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Accession: 007772231

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