Studies on the Biology of the West Indian Beach Clam, Donax Denticulatus Linné. 2. Life-History
The life-history of Donax denticulatus Linné is described and the environmental factors which affect it are discussed. Unlike the Donax populations of higher latitudes, fluctuations in temperature are not important, but periodic reduction in salinity with coincident clouding and contamination of the water during the rainy seasons has regular and prolonged effects on populations. The planktonic larval life lasts for three weeks or more, during which time the larvae may suffer complete decimation or be transported several miles away to establish a new population. There is much disparity in the growth rates of clams, depending on the amount of available food. Consequently, adult clams from different beaches differ in their maximum sizes. Mortality is highest among the spat, and less than one per cent of a population survives beyond the first year. Although periodic mass mortality may occur, most populations are able to perpetuate themselves from year to year.
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Document Type: Research Article
Publication date: 1968-12-01
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