The effect of sewage effluent on the population density and size of the clam Parvilucina tenuisculpta |
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| Authors: | Reva Fabrikant |
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| Institution: | University of Southern California Present address: 921 10th St, Apt. 203, Santa Monica, CA 90403, USA |
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| Abstract: | Changes in the population density and size of the clam Parvilucina tenuisculpta were related to municipal waste effluent (in particular, organic nitrogen concentration) off the coast of Palos Verdes, California. Average clam size increased as sediment organic nitrogen concentration increased, but population density increased until organic nitrogen concentration reached a critical level when population density decreased dramatically. These effects were explained in terms of increased available nutrition (in the form of sediment organic nitrogen pollutants) enhancing both population and individual size growth. However, when a critical concentration of organic decomposition products was reached, population density decreased due to the toxicity of the released compounds. It is suggested that Parvilucina tenuisculpta would make a good bioindicator of organic enrichment pollution. |
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