Department of Zoology, Universty of Hawai'i

Tonatiuh Trejo
Department of Zoology,
University of Hawai`i
2538 McCarthy Mall,
Edmondson 152
Honolulu, HI 96822
tonatiuh@hawaii.edu




Research Interests:
I am a Ph.D. student working with Dr. Brian Bowen, whose research interests include the phylogeography and conservation genetics of marine vertebrates. I am using microsatellites as a genetic marker to study the population structure, genetic diversity, patterns of dispersal, and the age and stability of Pacific stocks of two species of deepwater snappers, Ehu (Etelis carbunculus) and Onaga (Etelis coruscans). These fishes occur throughout the Indo-Pacific Ocean at depths of 90 to 400 meters, and support major fisheries in Hawaii and across the West Pacific. However, recent stock assessments in Hawaii, American Samoa and the Northern Mariana Islands indicate substantial declines in the snapper fishery. Effective conservation and management strategies for commercially targeted marine fishes require knowledge of their population structure. Therefore, I am using molecular genetic data to infer population structure in these snappers by quantifying the degree of genetic relatedness between geographically isolated populations.

In addition to my current research, I hope to continue previous molecular work I've done with sharks. I recently completed my M.S. degree from the Moss Landing Marine Laboratories, where I studied the global phylogeography of all three species of thresher sharks (Alopias pelagicus, A. superciliosus, and A. vulpinus). Thresher sharks are widely targeted by commercial and recreational fisheries, and recent studies indicate large population declines in the Atlantic and Pacific oceans. My data provide evidence for significant genetic differentiation among thresher shark populations; therefore, international cooperation will be required for the sustainable management of these species, which are vulnerable to exploitation because they grow slowly, produce few offspring, and have long inter-birth intervals.