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Whale and dolphin death toll during Deepwater disaster may have been greatly underestimated
Date:3/29/2011

strandings has ever recovered anything close to 100% of the deaths occurring in any cetacean population. The highest rate we found was only 6.2%, which implied 16 deaths for every carcass recovered."

The reason for the gulf between the estimates may simply be due to the challenges of working in the marine environment. The Deepwater disaster took place 40 miles offshore, in 1500m of water, which is partly why estimates of oil flow rates during the spill were so difficult to make.

"The same factors that made it difficult to work on the spill also confound attempts to evaluate environmental damages caused by the spill," said Williams. "Consequently, we need to embrace a similar level of humility when quantifying the death tolls."

If the approach outlined by this study were to be adopted the team believe this may present an opportunity to use the disaster to develop new conservation tools that can be applied more broadly, revealing the environmental impacts of other human activities in the marine environment.

"The finding that strandings represent a very low proportion of the true deaths is also critical in considering the magnitude of other human causes of mortality like ship strikes, where the real impacts may similarly be dramatically underestimated by the numbers observed" said John Calambokidis, a Researcher with Cascadia Research and a co-author on the publication.

"Our concern also applies to certain interactions with fishing gear, because there are not always systematic data with which to accurately estimate by-catch, especially for large whales", noted Jooke Robbins, a co-author from the Provincetown Center for Coastal Studies. "When only opportunistic observations are available, these likely reflect a fraction of the problem."

"While we did not conduct a study to estimate the actual number of deaths from the oil spill, our research reveals that the accepted figures are a grave underestimation," conc
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Contact: Ben Norman
Lifesciencenews@wiley.com
44-012-437-70375
Wiley-Blackwell
Source:Eurekalert

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