鹿児島湾で卓越するカイアシ類の成長速度 : 擬似コホート飼育法による推定

概要

論文の詳細を見る
Growth rate of predominant copepods in Kagoshima Bay was estimated by the artificial cohort method established by Kimmerer and McKinnon (1987). Most predominant calanoid copepod was Paracalanus parvus sensu latu in June and July, and Paracalanus crassirostris in September. Subsequent development was observed for some incubations, although temporal changes of stage composition was obscure for most experimental bags due to the insufficient size fractionation at start of incubation. Instantaneous growth rate was estimated to be 0.05 to 0.32 day1 for P. parvus s.l. and 0.06 to 0.20 day1 for P. crassirostris. Growth rates showed a negative correlation to ambient temperature and positive to chlorophyll a concentration of micro-sized phytoplankton. The estimates by artificial cohort methods were lower than those calculated from the empirical models, indicating food limitation on growth in Kagoshima Bay. Large variance of the estimates might be associated with size selective mortality and age structure within stage.
鹿児島大学の論文
2007-12-25