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Genetics links whale to two different ocean basins

For the first time ever, a genetic study has followed a single humpback whale from one ocean basin to another, adding to traditional notions of the migratory patterns of these majestic marine mammals in the process, according to researchers from the Wildlife Conservation Society (WCS), the American Museum of Natural History (AMNH), and New York University. In the most recent Royal Society's Biology Letters, a male humpback whale that was first sighted in Madagascar's Antongil Bay in 2000 was found in 2002 swimming off the coast of Loango National Park in Gabon--on the other side of the African continent.

"While the movement of whales from one ocean to another has always been a possibility, it's quite difficult to track in the wild," said WCS researcher Dr. Cristina Pomilla, lead author of the study. "This study demonstrates the ability of molecular technologies to confirm the movements of an individual whale between ocean basins."

The study examined DNA samples extracted from skin biopsies collected from whales in the wintering grounds of both the Indian and South Atlantic Oceans for evidence of inter-oceanic exchange of individuals. Using a method of genetic capture-recapture of genotypes constructed of microsatellite markers, the researchers identified an individual whale sampled in Gabonese waters in 2002 that had been first seen (and sampled) with its mother in Madagascar waters in 2000. Pomilla and her colleague, Dr. Howard Rosenbaum of WCS and AMNH, suspect that the whale could have been a three- to four-year old juvenile at the time of the second encounter with researchers.

The only other documentation of individual humpback whales moving from one ocean basin to another dates back to when the species still was hunted commercially. Two whales that were marked off western Australia (in the Indian Ocean basin) were later killed off the coast of eastern Australian, in the Pacific Ocean.

The identification of individual whales moving
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Source:Wildlife Conservation Society


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