Experimental Study on the Interspecific Interactions Between the Two Bloom-Forming Algal Species and the Rotifer Brachionus plicatilis |
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| Authors: | XIE Zhihao XIAO Hui TANG Xuexi CAI Hengjiang |
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| Institution: | 1. Marine Ecology Laboratory, Ocean University of China, Qingdao 266003, P. R. China;Faculty of Life Science and Biotechnology, Ningbo University, Ningbo 315211, P. R. China
2. Marine Ecology Laboratory, Ocean University of China, Qingdao 266003, P. R. China |
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| Abstract: | The interspecific interactions between the rotifer Brachionus plicatilis and two harmful algal blooms (HAB) species were investigated experimentally by single culture method. B. plicatilis population and the growth of the two algae were compared at different algal cell densities. The results demonstrated that the B. plicatilis obtained sufficient nutrition from Prorocentrum dong-haiense to support net population increase. With exposure to 2.5×104 cells mL-1 of P. donghaiense, the number of B. plicatilis in-creased faster than it did when exposed to other four algal densities (5, 10, 15 and 20×104 cellsmL-1), and the increase rate of B. plicatilis population (r) at this algal density was 0.104±0.015rd-1. Cell densities ofP. donghaiense decreased due to the grazing of B. plicatilis. In contrast, Heterosigma akashiwo had an adverse effect on B. plicatilis population and its growth was largely unaffected by rotifer grazing. In this case, B. plicatilis population decreased and H. akashiwo grew at a rate similar to that of the control. |
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| Keywords: | population Prorocentrum donghaiense Heterosigma akashiwo Brachionus plicatilis |
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