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Intraspecific diversity is critical to population-level risk assessments
René S Shahmohamadloo1,2, Seth M Rudman3,4, Catherine I Clare5
1School of Biological Sciences, Washington State University, Vancouver, Washington, WA, 98686, USA. rene.shahmohamadloo@wsu.edu.
Scientific Reports
|October 29, 2024
Summary
Environmental risk assessments (ERAs) using single genotypes are often inaccurate. Incorporating genetic diversity in Daphnia magna populations improves predictions of contaminant effects, crucial for ecological protection.
Area of Science:
- Ecotoxicology
- Environmental Science
- Genetics
Background:
- Environmental risk assessment (ERA) is vital for predicting population health impacts from contaminants.
- Current ERA methods often rely on single genotypes, which may not represent diverse natural populations.
Purpose of the Study:
- To assess the impact of intraspecific genetic variation on toxicity testing accuracy.
- To evaluate the role of genetic diversity in Daphnia magna responses to microcystins.
Main Methods:
- Quantified phenotypic variation in 20 Daphnia magna clones exposed to microcystins.
- Simulated population survival based on clonal tolerance data.
- Performed whole genome sequencing to correlate toxicological responses with genomic divergence.
Main Results:
- Significant genetic variation in survival, growth, and reproduction was observed, amplified by microcystins exposure.
- Single-genotype toxicity estimates frequently failed to predict population responses accurately.
- No significant correlation was found between toxicological responses and genomic divergence at candidate loci.
Conclusions:
- Intraspecific genetic variation significantly influences population-level responses to environmental contaminants.
- ERAs must include broad genetic diversity, not just candidate genes, for reliable contaminant impact predictions.
- Clonal variation, rather than specific gene variations, is a key predictor of toxin response in natural populations.
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