Burial, crawling and drifting behaviour of the bivalve Macomona liliana in response to common sediment contaminants |
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| Authors: | David S Roper Marion G Nipper Christopher W Hickey Michael L Martin and Mark A Weatherhead |
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| Institution: | National Institute of Water and Atmospheric Research, P.O. Box 11-115, Hamilton, New Zealand |
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| Abstract: | To investigate the effect of sediment contamination on the tellinid bivalve Macomona liliana, juvenile shellfish (about 1.3 mm long) were exposed to copper- and zinc-dosed sand, and sediments collected from several contaminated sites. The behavioural responses measured included burial rate, crawling and drifting. In copper-dosed sediment, a significant reduction in the number of shellfish burying after 10 min occurred at 25 mg Cu kg?1 (dry wt). After a 96-h exposure, shellfish crawled away from sediment with 10 mg Cu kg?1 (dry wt), and when a weak current was provided they left this 10 mg Cu kg?1 (dry wt) sediment by drifting. Zinc-dosed sediment slowed burial at 80 mg Zn kg?1 (dry wt), and stimulated crawling and drifting at 40 mg Zn kg?1 (dry wt). Some of the field-collected contaminated sediments slowed burial and stimulated drifting, but none affected crawling. It appears that juvenile drifting induced by sediment contamination could play a role in determining M. liliana distributions. |
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