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Variation in sensitivity to cadmium among genetically characterized laboratory strains of the midge Chironomus riparius.

Abstract：

:Estimating the extent of intraspecific variation in sensitivity to contaminant exposure is important in order to explain variation in the outcome of toxicity tests and to predict the effects of chemical stress on natural populations of plants and animals. However, only few studies provide evident data concerning intraspecific variation in life-history traits caused by a differential response to chemical stress. In this study, we compared the life-history response of six laboratory strains of the midge Chironomus riparius to cadmium exposure in a full life-cycle assay. In addition, the level of genetic variation in all strains was measured at five variable microsatellite loci. Several significant differences in life-history traits among the strains were observed in controls and cadmium treatments. The extent of variation among strains was largest at moderate cadmium concentration (0.42 mg Cd/kg dw). At increased Cd concentrations all strains showed similar levels of high mortality and reduced reproductive success. All strains exhibited considerable levels of genetic impoverishment compared to field populations. Strains with low genetic variation showed reduced fitness in the controls and were more susceptible to Cd exposure. For instance, no reproductive success in the lowest Cd treatment was observed for the strain with the lowest level of genetic diversity. In contrast, this Cd concentration had no negative effects on life-history traits of more variable strains. These results confirm recent findings, that inbreeding and reduced genetic variation influence the reaction of populations towards environmental stress. In addition, we show that the level of genetic variation and inbreeding directly influences the outcome of toxicity tests and contributes to the lack of reproducibility of test results among laboratories.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Nowak C,Czeikowitz A,Vogt C,Oetken M,Streit B,Schwenk K

doi

10.1016/j.chemosphere.2007.12.023

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

1950-6

issue

10

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(07)01549-4

journal_volume

71

pub_type

杂志文章

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