Caleb's Research

I am an integrative tropical biologist interested in the evolution, ecology, and distributions of fishes. While most of my work centers around the systematics, taxonomy, and historical biogeography of fishes - I collaborate with scientists active in areas of study such as paleontology, physiology, genomics, environmental science, and behavior. I view interdisciplinary approaches as offering the most for enhancing our understanding of biodiversity. I work primarily with Neotropical freshwater fishes of Mexico, Central and South America.

Over several decades of collecting throughout the Neotropics, as well as continuous development of new analyses, we are now able to incorporate many types of data and approaches to better understand the diversity and distributions of fishes. Nearly every aspect of my research is collections-based and relies heavily on specimens housed in museums, as well as my own recent collections. In addition to work on fishes, I am also deeply interested in systematic theory and the use of morphological characters in phylogenetic reconstruction, as well as in-depth studies of incongruence between morphological and molecular hypotheses of phylogeny.

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Ongoing research projects

  • Biogeography of freshwater fishes in Middle America

  • Ecology and life-history of fishes

  • Systematics and taxonomy of Neotropical fishes

  • Interactions between salinity physiology and evolution in cichlid fishes