Modification of the feeding behavior of marine copepods by sub-lethal concentrations of water-accommodated fuel oil |
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Authors: | M. S. Berman D. R. Heinle |
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Affiliation: | (1) Chesapeake Biological Laboratory, University of Maryland, Center for Environmental and Estuarine Studies, 20688 Solomons, Maryland, USA;(2) Present address: Graduate School of Oceanography, University of Rhode Island, 02881 Kingston, Rhode Island, USA |
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Abstract: | The feeding behaviors of Acartia clausi and A. tonsa were measured in samples of water containing low levels of a water-accommodated fraction of No. 2 fuel oil. The copepods fed normally at a hydrocarbon concentration of 70 g l-1, but their feeding behavior was altered both quantitatively and qualitatively at a concentration of 250 g l-1. Three types of response to the higher oil level were found. The first was total suppression of feeding. Both other types involved suppression of feeding on particles between 7 and 15 m diameter, but one showed no change in the ingestion of larger particles, whereas the other displayed increased feeding on particles larger than 15 m diameter. These results suggest that the species of Acartia studied use three different modes of feeding, each on a different size range of particulate material. Low-level hydrocarbon pollution affects each feeding mode differently.Contribution No. 973, Center for Environmental and Estuarine Studies of the University of Maryland |
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