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Whales and human-related activities overlap in African waters
Date:2/5/2014

-Antarctic waters. Overall, the tagged whales collectively traveled more than 40,545 kilometers (25,193 miles) with each whale traveling an average of 3,116 kilometers (1,936 miles). Tags transmitted data for up to 104 days, and two whales traveled astonishing long-distance migrations of more than 8,000 kilometers from near the equator to the edge of the sub-Antarctic ice shelf around Bouvet Island.

One surprising discovery contradicted expectations: while several whales predictably remained in the offshore waters of Gabon or traveled south, nearly half of the tagged group (including two females with calves) moved north into previously undocumented breeding grounds. The team also sought to assess overlap between whale movements and the extent of human activities, including oil platforms and shipping lanes.

"Whales make some of the most fascinating migrations of any animals in the world," said Dr. Sara Maxwell, a researcher affiliated with the Stanford Woods Institute for the Environment and a study co-author. "As part of this study, we uncovered previously unknown migration routes of some of the world's largest whales, showing that even today we are still in an age of discovery for these ocean giants."

Overall, the whales spent nearly 76 percent of their time within the Exclusive Economic Zones (defined as 200 nautical miles from the coast) of 13 different African countries, but mostly in the Exclusive Economic Zones (EEZs) of Cameroon, Gabon, Nigeria, and Angola. Humpbacks traveling north from and remaining in the coastal waters of Gabon spent an estimated 41 percent of their time in the presence of oil and gas platforms.

"There are indications that oil production in these regions has and will increase in the coming years, so gaining a better understanding of the movements of whales and quantifying the degree of overlap with human activities will help assess the potential risks to this population, and help us to identify
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Contact: John Delaney
jdelaney@wcs.org
718-220-3275
Wildlife Conservation Society
Source:Eurekalert  

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