遺伝的変異を考慮した感受性評価：ミジンコ集団を例に [in Japanese] Evaluation of the effect of genetic divergence on variability in susceptibility to a chemical toxicant in zooplankton populations [in Japanese]
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Although many ecological risk assessments of hazardous chemicals have beenconducted with test organisms, such procedures may be insufficient for establishingreliable hazard assessments in wild organisms. The genetic variation within a species israrely considered in such assessments. Here, the relationship between variability insusceptibility to fenvalerate, an agrochemical toxicant, and the degree of divergence inallele frequencies at six microsatellite loci were assessed in <I>Daphnia galeata</I>populations in Lake Kasumigaura and an adjacent local pond. The acute EC50, basedon changes in neonate immobility, in isofemale lines from three populations in LakeKasumigaura was 5–10 times that observed in lines from the local pond population;however, the degree of divergence in allele frequencies was much larger among the LakeKasumigaura populations than between the lake and local pond populations. Theseresults suggest that the level of resistance to the toxicant was determined primarily bythe gradient of pollutants resulting from water flow and did not reflect the geneticdivergence of local populations. I also discuss a possible causal link betweensusceptibility against toxicant and genetic variation for future perspectives of ecologicalrisk assessments.
- Japanese Journal of Environmental Toxicology
Japanese Journal of Environmental Toxicology 16(2), 29-35, 2013
The Japanese Society of Environmental Toxicology