August 28, 2013 in Nation/World

Virus likely causing surge in dolphin deaths

Outbreak likely to grow as bottlenoses move south
Erika Bolstad McClatchy-Tribune
 
By the numbers

333: Approximate number of bottlenose dolphins that have been found stranded along the East Coast this summer

742: Number of bottlenose dolphins that died during a similar disease outbreak in the 1980s

33: Approximate number of bottlenose dolphins found stranded along the East Coast during a normal year

WASHINGTON – A virus similar to measles in humans may be responsible for the deaths of more than 333 bottlenose dolphins along the East Coast this summer, researchers said Tuesday.

The morbillivirus outbreak extends from coastal areas of New York to North Carolina, causing dolphin deaths in numbers not seen since a similar fatal outbreak on the Eastern Seaboard 26 years ago.

Since July 1, researchers have found 333 dead dolphins on or near shore. Of those deaths, 174 were in Virginia, the National Oceanic and Atmospheric Administration said Tuesday. Generally, scientists find about 33 stranded bottlenose dolphins a year.

The virus likely will continue killing dolphins as long as there are susceptible animals that can be infected, said Teri Rowles of the NOAA Fisheries Marine Mammal Health and Stranding Response Program.

“We don’t have a lot of insight into when it will stop,” she said.

There’s no practical way to immunize wild dolphins, so there’s little federal wildlife officials can do about the outbreak other than to monitor it and try to figure out why it’s happening and what may have caused it.

Based on the behavior of the 1987 outbreak, researchers suspect the virus will spread south as the bottlenose dolphins head to warmer waters for the winter. It likely will last until it has killed off all but those dolphins that have developed an immunity to the virus, said Jerry Saliki of the University of Georgia.

The 1980s outbreak killed 742 dolphins; it wasn’t until several years later that researchers determined what killed them. Scientists used tools developed in a dolphin die-off in the Mediterranean to help determine what killed the bottlenose dolphins in the 1980s.

Researchers are looking at what could have caused the latest outbreak among bottlenose dolphins. Such outbreaks are common in other animal populations, scientists said, although the virus doesn’t jump from species that aren’t closely related. Humans can’t get the dolphin form of the virus, for example. But researchers have traced morbillivirus outbreaks in African lions to unvaccinated domestic dogs. And primates also get measles, Saliki said.


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