Food Organisms and Food Consumption Rates in Neptunea arthritica.
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概要
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Food organisms in the wild population of<I>Neptunea arthritica</I>in Usu Cove, Hokkaido, and its food consumption rates in the laboratory were investigated. In the field<I>N. arthritica</I>fed on various prey, including<I>Mytilus edulis</I> (live, L), <I>Patinopecten yessoensis</I> (L), fish (dead, D) and <I>Hemigrapsus</I> spp. (D) . But, most individuals were observed feeding on live bivalves, such as<I>M. edulis</I>and<I>P. yessoensis</I>, while only 20.1% fed on carrion. The food consumption rate per bout of feeding in<I>N. arthritica</I>decreased nearly exponentially with increasing shell height, and food consumption was greatly governed by body weight of individuals. On the basis of comparisons of the slopes and heights in the regressions of food consumption rate on shell height by analysis of covariance, food consumption was considered to be related to water temperature and other factors, in addition to body weight.
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