Baby dolphins washing up in Gulf

CNN reports: Baby bottlenose dolphins are washing up dead in record numbers on the shores of Alabama and Mississippi, alarming scientists and a federal agency charged with monitoring the health of the Gulf of Mexico.

Moby Solangi, the executive director of the Institute for Marine Mammal Studies (IMMS) in Gulfport, Mississippi, said yesterday that he's never seen such high death numbers.

"I've worked with marine mammals for 30 years, and this is the first time we've seen such a high number of calves," he said. "It's alarming."

At least 24 baby dolphins have washed up on the shores of the two states since the beginning of the year -- more than ten times the normal rate. Also, six older dolphins died.

In January 2009 and 2010, no calf strandings were reported, compared to four in January 2011, the institute said. During the month of February for those years, only one calf stranding was reported each year.

The occurrence has prompted NOAA to designate these deaths as an "unusual mortality event" -- defined as a stranding incident that is unexpected or involves a significant loss of any marine mammal population.

Marine mammals are particularly susceptible to harmful algal blooms, infectious diseases, temperature and environmental changes, and human impact, she said.

"Unfortunately we don't have a smoking gun here. We're looking at the possibility of an algal bloom but we don't see any evidence of a bloom going on in the water. Temperatures are a bit cooler, so we're looking into water temperature data and seeing if that has a role, but it's a little bit too early to tell."

The IMMS said it has been able to perform full necropsies on a third of the 24 calves. The majority of the calves were too decomposed for a full examination, but the institute has taken tissue samples for analysis.

The institute does not have conclusive results on the causes of death.

Following the Deepwater Horizon rig explosion last April, which killed 11 workers and caused the worst oil spill in U.S. history, there has been heightened concern over the environmental impact.

Due to the government's ongoing litigation with BP, which owned the oil well that erupted into the Gulf of Mexico, NOAA said it must operate under specific protocol in handling the dead dolphins. That might mean a delay in seeing the necropsy results.