A toxin produced by marine algae is inflicting brain damage on sea lions along California’s coast, causing neurological and behavioral changes that can impair their ability to navigate in the sea and survive in the wild, scientists said on Monday.
(From Scientific American) — Brain scans on 30 California sea lions detected damage in the hippocampus, a brain structure associated with memory and spatial navigation, in animals naturally exposed to the toxin known as domoic acid, the researchers said.
Domoic acid mimics glutamate, a chemical that transmits nerve impulses in the brain, and leads to over-activation of hippocampus nerve cells and chronic epilepsy, according to Emory University cognitive psychologist Peter Cook, who worked on the study while at the University of California-Santa Cruz.
“The behavioral deficits accompanying brain damage with domoic acid are severe, and may negatively impact foraging and navigation in sea lions, driving strandings and mortality,” Cook said.
Read the full article here: http://www.scientificamerican.com/article/toxic-algae-causing-brain-damage-in-sea-lions-along-california-coast/