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Lethal and sublethal effects of short term acute doses of kuwait crude oil and a dispersant corexit 9527 on bay scallops argopecten irradians and 2 predators at different temperatures



Lethal and sublethal effects of short term acute doses of kuwait crude oil and a dispersant corexit 9527 on bay scallops argopecten irradians and 2 predators at different temperatures



Marine Environmental Research 5(3): 195-210



Investigatiaons of short term acute exposure of bay scallops, A. irradians, and 2 scallop predators, the oyster drill Urosalpinx cinerea and the common starfish Asterias forbesi, to oil, dispersant and oil-dispersant mixtures (Kuwait Crude Oil and Corexit 9527) suggested that predator and prey have different lethal susceptibilities. Scallops were most sensitive to dispersant and dispersant mixed with oil, starfish were only sensitive to dispersant while the oyster drill seemed unaffected even though all were exposed to dilutions of identically prepared stock solutions. Scallops were least susceptible during winter months and most susceptible at summer temperatures. Treatment had less effect on predators than on scallops at summer temperatures. Sublethal concentrations of dispersant and oil-dispersant mixtures diminished the behavioral ability of scallops to recognize drills and starfish. The degree of effect increased with temperature. Predator detection of prey at the same concentrations was more complex. The feeding response or posturing reflex of starfish was significantly slowed by all treatments. In contrast, drills were unaffected in their recognition of scallop effluent in a choice chamber after treatment.

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Accession: 005803862

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