Data from: Testing for beneficial reversal of dominance during salinity shifts in the invasive copepod Eurytemora affinis, and implications for the maintenance of genetic variation
Posavi, Marijan, University of Wisconsin-Madison
Gelembiuk, Gregory William, University of Wisconsin-Madison
Larget, Bret, University of Wisconsin-Madison
Lee, Carol Eunmi, University of Wisconsin-Madison
Published Jul 28, 2014 on Dryad.
Cite this dataset
Posavi, Marijan; Gelembiuk, Gregory William; Larget, Bret; Lee, Carol Eunmi (2014). Data from: Testing for beneficial reversal of dominance during salinity shifts in the invasive copepod Eurytemora affinis, and implications for the maintenance of genetic variation [Dataset]. Dryad. https://doi.org/10.5061/dryad.79400
Maintenance of genetic variation at loci under selection has profound implications for adaptation under environmental change. In temporally and spatially varying habitats, non-neutral polymorphism could be maintained by heterozygote advantage across environments (marginal overdominance), which could be greatly increased by beneficial reversal of dominance across conditions. We tested for reversal of dominance and marginal overdominance in salinity tolerance in the salt-to-freshwater invading copepod Eurytemora affinis. We compared survival of F1 offspring generated by crossing saline and freshwater inbred lines (between-salinity F1 crosses) relative to within-salinity F1 crosses, across three salinities. We found evidence for both beneficial reversal of dominance and marginal overdominance in salinity tolerance. In support of reversal of dominance, survival of between-salinity F1 crosses was not different from that of freshwater F1 crosses under freshwater conditions and saltwater F1 crosses under saltwater conditions. In support of marginal overdominance, between-salinity F1 crosses exhibited significantly higher survival across salinities relative to both freshwater and saltwater F1 crosses. Our study provides a rare empirical example of complete beneficial reversal of dominance associated with environmental change. This mechanism might be crucial for maintaining genetic variation in salinity tolerance in E. affinis populations, allowing rapid adaptation to salinity changes during habitat invasions.
MARGINAL OVERDOMINANCE SURVIVAL DATA
This dataset was generated by an experiment performed by Marijan Posavi to test for the presence of reversal of dominance and marginal overdominance in salinity tolerance in the salt-to-freshwater invading copepod Eurytemora affinis. Saline and freshwater inbred lines were crossed to determine survival of the F1 hybrids relative to each parental line at three salinities. This research was performed in the laboratory of Carol Eunmi Lee at the University of Wisconsin, and was funded by the National Science Foundation.