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So, what happened this year to make so many birds weak? SeaWorld took the lead on the investigation. Necropsies were conducted to arrive at a cause of death. All of the birds were very young, typically hatched within the year. There was no suggestion of trauma, infectious disease or toxins. These birds were starving. With this information, the first piece of the puzzle was in place. To put the rest of the story together it took the combined efforts of biologists from the Salton Sea, Arizona, the University of California at Davis, U.S. Fish and Wildlife Service, California Fish and Game, diagnostic laboratories and even local bait fishermen.
It turns out that the dying pelicans had quite a story to tell. Three biologists had information from the nesting sites. The information helped to determine what was happening in the lives of these birds before they became sick. In January and February, many birds arrived at the nesting sites on the islands off of California and in Mexico's Sea of Cortez. There were lots of nests and lots of chicks hatched in March and April. The fish that the birds eat - mostly sardines - were abundant. As many as 10 times more chicks left the nest this year as compared to previous years. Just as those chicks were learning to be fishermen, the sea surfaces were changing. There were still abundant anchovies, but they weren't all at the surface waiting to be a pelican's dinner. The young pelicans simply weren't very skilled at fishing. Lots of young birds flew way off course looking for a meal. Some ended up on the highways and even golf course ponds of Arizona. Some made it all the way to Las Vegas. Lots made it to San Diego - all were very hungry.
SeaWorld was able to pull together a team from all over the Southwest to look at the pelican population and ocean conditions that led to this event, ultimately solving the mystery of the starving pelicans. Most important, the park's experience in rescuing and rehabilitating marine animals made it possible to give more than 70 young birds a second chance. |