Ion Transporter Gene Families as Physiological Targets of Natural Selection During Salinity Transitions in a Copepod

Author:

Lee Carol Eunmi1ORCID

Affiliation:

1. Department of Integrative Biology, University of Wisconsin, Madison, Wisconsin

Abstract

Salinity is a key factor that structures biodiversity on the planet. With anthropogenic change, such as climate change and species invasions, many populations are facing rapid and dramatic changes in salinity throughout the globe. Studies on the copepod Eurytemora affinis species complex have implicated ion transporter gene families as major loci contributing to salinity adaptation during freshwater invasions. Laboratory experiments and population genomic surveys of wild populations have revealed evolutionary shifts in genome-wide gene expression and parallel genomic signatures of natural selection during independent salinity transitions. Our results suggest that balancing selection in the native range and epistatic interactions among specific ion transporter paralogs could contribute to parallel freshwater adaptation. Overall, these studies provide unprecedented insights into evolutionary mechanisms underlying physiological adaptation during rapid salinity change.

Funder

Agence Nationale de la Recherche

National Science Foundation

Publisher

American Physiological Society

Subject

Physiology

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