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ACUTE TOXIC EFFECT OF BDE-209 ON FEEDING BEHAVIOR OF ROTIFER BRACHIONUS PLICATILIS
Author(s): 
Pages: 438-446
Year: Issue:  2
Journal: Oceanologia et Limnologia Sinica

Keyword:  BDE-209Brachionus plicatilisbait marine microalgaeacute toxicityfeeding activityfeeding selectivity;
Abstract: Under controlled laboratory conditions, the acute toxic effect of high brominated Deca-BDE(BDE-209) on Brachionus plicatilis and the response of feeding behavior to the stress were studied. Experiment was designed at five concentrations of BDE-209(2, 6, 10, 14, and 18mg/L) against a blank and a control groups in triplication. The results indicated that:(1) BDE-209 significantly inhibited the motile behavior of B. plicatilis and the 24 h-EC50 was 9.084mg/L, but the half lethal effects were not observed;(2) When four species of marine microalgae bait: Chlorella vulgaris, Platymonas helgolandica, Isochrysis galbana, and Cylindrotheca closterium were fed as the single food source, the filtering rate(F) and the feeding rate(G) of B. plicatilis decreased obviously as the increase of BDE-209 concentrations and exposure time, exhibiting a does-dependent manner, which indicated the feeding behavior of B. plicatilis was significantly inhibited by BDE-209;(3) when C. vulgaris, P. helgolandica, and I. Galbana were fed to B. plicatilis together as mixed food, the values of F, G, feeding selectivity ratio(Sr) and total biomass of B. plicatilis decrsased obviously in the same manner, and the food selectivity index(Si) changed simultaneously. C. vulgaris was the optimal food source for B. plicatilis with and without BDE-209 exposure. Moreover, the filtering rate was the most sensitive parameter to the stress and could be used as an indicator of zooplankton to the changes of ambient environment. We concluded that the stress of BDE-209 significantly changed the feeding and selecting behavior of B. plicatilis, and the optimal food source for it was C. vulgaris.
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