ISSN : 1225-3480
Temperature is the major environmental factor to determine the geographical distribution, species diversity and community structure of most living organisms. We hypothesized that temperature is being one of the environmental factors to determine community structure of the mollusks living in the intertidal zone of the rocky shore in the Jeju Island. For examination of our hypothesis, we sampled and analyzed mollusks quantitatively and seasonally at the 12 stations along the coast of Jeju Island from June 2011 to February 2012. Surface sea water and atmospheric temperature were used as temperature variables to analyze the correlation between community structure and temperature. The Jeju coast was divided into two areas (North-West area: lower temperature, South-East area: higher temperature) based on the surface sea water which was significantly different between the two areas (p < 0.05). There was no significant correlations, however, between community structure and temperature, and no significant difference (North-West and South-East areas) in the three variables (number of species, density and biomass) of the community structure between the two areas (p > 0.05). The foregoing hypothesis, therefore, was rejected based on the present results in the Jeju Island. Species diversity, which is based on the number of species, was higher in the South-East area than in the North-West area. Although temperature is not likely to be a provable factor to increase the species diversity in the intertidal malacofauna in the coast of Jeju Island, it could be affecting the community structure via interaction which the other factors such as grazing, salinity, dessication and tidal action.
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