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Cosmopolitan eels
Date:4/7/2010

Joshua Reece became interested in moray eels in 2005 when he was applying to the PhD program at the University of Hawai'i. Instead of taking him on a campus tour, his host, Brian Bowen, PhD, a biologist at the university, took him on a dive. Along the southwest coast of Oahu, Reece looked under a rock ledge and was startled to see five different species of moray eels looking back. When he later captured the eels, he found the same fish species in all of their bellies.

Reece immediately recognized the five eels as a dissertation project on a platter. "How can you have seven species of the same fish eating the same thing and, quite literally, living under the same rock?" he asks. "Species don't do that; if they exploit the same niche they don't diversify, and if they diversify they don't exploit the same niche."

What was up with the eels?

Reece, who is currently a graduate student in biology in Arts & Sciences at Washington University in St. Louis, still doesn't know the answer but having just completed the first phylogeographic survey of the Muraenidae, the family to which the eels belong, he now has a better sense of the problem.

The study, published in the online edition of the Journal of Heredity, was co-authored by Bowen, Allan Larson, PhD, professor of biology at Washington University and Reece's advisor, and two biology undergraduate students at Washington University: Kavita Joshi, now a student at the Washington University School of Medicine, and Vadim Goz, now at Mount Sinai Medical School.

Reece and his colleagues collected two species of eels, the undulated moray (Gymnothorax undulatus) and the yellow-edged moray (G. flavimarginatus) at a dozen different locations across the Indo-Pacific ocean. They were looking for genetic differences that might indicate interruptions in gene flow among populations of the eels either now or in the past.

The Indo-Pacific is a huge expanse of water, coveri
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Contact: Diana Lutz
dlutz@wustl.edu
314-935-5272
Washington University in St. Louis
Source:Eurekalert  

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