Genetic and demographic responses of mosquitofish ( Gambusia holbrooki girard 1859) populations stressed by mercury

Mulvey, Margaret; Newman, Michael C.; Chazal, Ann; Keklak, M. Michele; Heagler, M. Gay; Hales, Jr., L. Stan

doi:10.1002/etc.5620140818

Genetic and demographic responses of mosquitofish ( Gambusia holbrooki girard 1859) populations stressed by mercury

Journal Article · Tue Aug 01 00:00:00 EDT 1995 · Environmental Toxicology and Chemistry

DOI:https://doi.org/10.1002/etc.5620140818· OSTI ID:2496730

Mulvey, Margaret; Newman, Michael C.; Chazal, Ann; Keklak, M. Michele; Heagler, M. Gay; Hales, Jr., L. Stan

Abstract

Genetic and demographic changes in mosquitofish populations are reported after chronic (111 d) exposure to mercury. Sex ratios, normally female-biased in field populations, were also female-biased in control mesocosms. However, the sex ratio was male-biased in the mercury treatments. Frequencies of glucosephosphate isomerase-2 (Gpi-2) allozymes for fish exposed to mercury differed from initial frequencies and from those of control fish. In a selection-component analysis, female sexual selection was statistically significant for the mercury-treated fish; the proportion of females that were gravid differed among Gpi-2 genotypes. The number of developing embryos per female also differed among Gpi-2 genotypes. Mercury had genotype-specific effects on mosquitofish reproduction in addition to genotype-specific effects on mortality reported earlier. These effects may reflect metabolic qualities of the Gpi-2 genotypes or loci closely linked to the Gpi-2 locus.

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Sponsoring Organization:: USDOE

OSTI ID:: 2496730

Alternate ID(s):: OSTI ID: 94322

Journal Information:: Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 8 Vol. 14; ISSN 0730-7268

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United States

Language:: English

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