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Dr. Fink's research interests include biology and systematics of fishes, particularly Neotropical species, higher classification, and theory of systematics and biogeography. He is currently working on phylogenetics of piranhas, including the evolution of growth patterns and trophic specializations, and the historical biogeography of the group. He is also continuing his studies of ostariophysan fish relationships. In his phylogenetic analyses, emphasis is being placed on non-traditional characters such as ontogenetic trajectories and morphometrics.
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