Effects of Alexandrium tamarense and Prorocentrum donghaiense on rotifer Brachionus plicatilis population

Abstract

Abstract: The effects of Prorocentrum donghaiense and Alexandrium sp., causative species of harmful algal bloom of East China Sea in May 2002, on rotifer Brachionus plicatilis population were studied in the laboratory. The results showed that Alexandrium tamarense(ATHK) had a lethal effect on B.plicatilis and the 48hLC₅₀ was about 1300 cell穖l^-1. The toxin comparison of different fractions showed that the algal culture and re-suspended algal cells had the adverse effects, and the alga at earlier growth phases showed a stronger impact, indicating that the inhibitory effect was related with the activity of the living algal cells. P.donghaiense at high densities(4?10⁴,5?10⁴ and 10?10⁴ cell穖l^-1) had an adverse effect on B.plicatilis population, while at low densities(1?10⁴,2?10⁴ and 3?10⁴ cell穖l^-1), the alga could be used as food for rotifer population. When the two algae were mixed, the lethal effect of A.tamarense could be decreased by P.donghaiense.The results indicated that the above HAB event could affect the micro-zooplankton population in the occurrence area of East China Sea.

CLC Number:

Q948.8

WANG Liping, YAN Tian, TAN Zhijun, ZHOU Mingjiang. Effects of Alexandrium tamarense and Prorocentrum donghaiense on rotifer Brachionus plicatilis population[J]. Chinese Journal of Applied Ecology, 2003, (7): 1151-1155.

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