An outbreak of toxic bacteria in California's newly reformed Lake Tulare is killing birds stopping off at the lake on their migrations.
Stock image of a group of mallard ducks flying. Migrating birds at Lake Tulare are getting sick with avian botulism due to a surge of Clostridium botulinum in the water.Avian botulism type C is one of several neurotoxins produced by the bacterium. Type C toxins are usually not associated with any kind of human botulism, mostly impacting shorebirds and waterbirds.
The amount of toxin consumed by the birds is directly correlated with the degree of paralysis and therefore the mortality rate in a given area, the CDFW explained. "Many long-distance migrant birds depend on stopover sites to rest and 'fuel up' by feeding enough to reacquire fat that will provide energy for the next leg of the trip," Tom Langen, a professor of wetlands ecology at Clarkson University in New York,"Birds, because they fly, can store only so much fat, not enough to make the whole trip. This is especially true for small birds. So safe, food-rich stopover sites are crucial.
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