About the Authors

Benjamin H. Letcher

To whom correspondence should be addressed. E-mail: ben_letcher@usgs.gov

Affiliation S.O. Conte Anadromous Fish Research Center, United States Geological Survey, Leetown Science Center, Turners Falls, Massachusetts, United States of America

Keith H. Nislow

Affiliation Northern Research Station, United States Department of Agriculture (USDA) Forest Service, University of Massachusetts, Amherst, Massachusetts, United States of America

Jason A. Coombs

Affiliations S.O. Conte Anadromous Fish Research Center, United States Geological Survey, Leetown Science Center, Turners Falls, Massachusetts, United States of America, Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts, United States of America

Matthew J. O'Donnell

Affiliation S.O. Conte Anadromous Fish Research Center, United States Geological Survey, Leetown Science Center, Turners Falls, Massachusetts, United States of America

Todd L. Dubreuil

Affiliation S.O. Conte Anadromous Fish Research Center, United States Geological Survey, Leetown Science Center, Turners Falls, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: BL. Performed the experiments: BL KN MO TD. Analyzed the data: BL. Wrote the paper: BL KN. Other: Ran genetics samples: JC. Analyzed genetics data: JC.