With algal blooms on the rise in their habitat, sea lions in California are developing seizures and abnormal behavior, a new study of lab rodents shows.

The symptoms can result from low-dose fetal exposure to domoic acid, a naturally produced neurotoxin in algae that becomes concentrated in the sea lions’ food supply, researchers say.

A new study follows an analysis earlier this year revealing that the symptoms comprise a new sea lion disease.

Domoic acid concentrations rise at times due to natural, climactic factors, the authors point out. But other human-made chemicals may be making the sea lions more susceptible.

“This is probably just the beginning to understand how not just a single chemical, but a complex mix of chemicals we start life with can leave us vulnerable to disease later in life,” said study co-author John Ramsdell, a physiologist with the National Oceanic and Atmospheric Administration (NOAA).

He believes the new study, published in the current issue of the online journal Marine Drugs, also has implications for human health. 

Source: National Geographic