About the Authors

Michael Z Ludwig

To whom correspondence should be addressed. E-mail: mludwig@midway.uchicago.edu

Affiliation Department of Ecology and Evolution, University of Chicago, Illinois, United States of America

Arnar Palsson

Affiliation Department of Ecology and Evolution, University of Chicago, Illinois, United States of America

Elena Alekseeva

Affiliation Department of Ecology and Evolution, University of Chicago, Illinois, United States of America

Casey M Bergman

Affiliation Department of Genetics, University of Cambridge, United Kingdom

Janaki Nathan

Affiliation Department of Ecology and Evolution, University of Chicago, Illinois, United States of America

Martin Kreitman

Affiliation Department of Ecology and Evolution, University of Chicago, Illinois, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

MZL and MK conceived and designed the experiments. MZL performed the experiments with EA and JN helping with embryo staining and genotyping. CMB conducted genomic sequence analysis. AP analyzed images. MZL, AP, and MK analyzed the data. MZL and EA contributed reagents/materials/analysis tools. MZL, AP, and MK wrote the paper.