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Uniform Variation in Genetic-Traits of a Marine Bivalve Related to Starvation, Pollution and Geographic Clines

Hummel, H. and Bogaards, R.H. and Amiard-Triquet, C. and Bachelet, G. and Desprez, M. and Marchand, J. and Rybarczyk, H. and Sylvand, B. and De Wit, Y. and De Wolf, L. (1995) Uniform Variation in Genetic-Traits of a Marine Bivalve Related to Starvation, Pollution and Geographic Clines. Journal of Experimental Marine Biology and Ecology, 191, 133-150. ISSN 0022-0981.

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Official URL: http://dx.doi.org/10.1016/0022-0981(95)00047-U

Abstract

Consistent patterns of genetic variation in the marine bivalve Macoma balthica (L.) were found after exposure to low levels of copper, starvation, and along geographic dines. The geographic dines were related to temperature and salinity. Genetic differences were primarily found in the LAP (Leucine aminopeptidase) locus; under stress the frequency of one specific allele, and thereby the heterozygosity, decreased strongly. The degree of changes depended on age and condition of the animals; adult animals showing stronger changes than juveniles. Law concentrations of copper yielded stronger genetic changes than high concentrations. It is concluded that genetic diversity and stress-sensitivity of species change predictably along a gradient in response to environmental harshness. Animals near the southern limit of their range were more sensitive to additional stress. [KEYWORDS: Age; bivalve; condition; genetics; geographic cline; macoma balthica; metal; pollution; salinity; species distribution; stress-sensitivity; temperature Mussel mytilus-edulis; allele frequency cline; population-genetics; macoma-balthica; crassostrea-virginica; allozyme variation; selection; differentiation; oyster; polymorphisms]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:10330
Deposited On:25 Nov 2011 01:00
Last Modified:31 Mar 2014 09:59

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