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[Selective feeding of Calanus sinicus on harmful algal blooms species in East China Sea in spring].

From April 27th to June 5th 2005, the selective feeding of Calanus sinicus on harmful algal blooms (HABs) species was studied by in situ feeding experiments at six typical stations in a high frequency red tide occurring region of East China Sea. The results showed that the selective feeding behavior of C. sinicus was dependent on food density. It had an obvious food selectivity when the abundance of phytoplankton cell was low, but the selectivity changed from preference to discrimination at high phytoplankton cell abundance, with a threshold value of 329 cells ml. The selective feeding of C. sinicus was also dependent on food composition. It showed no selective feeding or discrimination on microzooplankton at most stations, but preferred to P. delicatissima and disliked Karenia mikimotoi at HABs occurring station, which induced the succession of phytoplankton community to K. mikimotoi blooming.