Acknowledgements
We thank the New Mexico Department of Game and Fish for funding contemporary tissue collection and stable isotope analysis. The U.S. Fish and Wildlife Service funded historical tissue collection and stable isotope analyses. This work would not have been possible without specimen curation by the Division of Fishes at the Museum of Southwestern Biology at the University of New Mexico. We would like to specifically acknowledge the Curator of Fishes, Dr. Thomas Turner and the Collections Manager Emily DeArmon for permission and assistance in collecting tissue samples. We would also like to thank Scott Durst for helpful comments on a previous version of the manuscript.