In the last few weeks, many sick and dying California Sea Lions began showing up on central California beaches, even hauling out at Pier 39 in San Francisco. They were victims of Amnesic Shellfish Poisoning, aka Domoic Acid Toxicosis. What is domoic acid, where does it come from, and why is it affecting so many marine mammals? For answers we turn to Dr. Pádraig Duignan, Director of Pathology at the Marine Mammal Center in Sausalito. He is at the front lines in the response to this outbreak, in addition to many other novel diseases affecting marine mammals, and explains what is happening and why.

We spoke with Dr. Eric Bjorkstedt of the NOAA Fisheries Ecosystem Science Center. He talked about some of the work being done at the Telonicher Marine Laboratory in Trinidad, Humboldt County,
monitoring the offshore marine ecosystem in this little-studied region. Dr. Bjorkstedt gives us an update on current research and some recent findings, including how some key elements of the food web have responded to marine heat waves, as well as the large-scale oscillations of marine weather in the Northeast Pacific Ocean.

Birds invest considerable effort in the reproductive processes and have evolved myriad ways to improve their chances of success. The entire process of mating, nest-building, brooding, and rearing young consumes enormous amounts of energy, often leaving the parent birds nearly worn-out by the time their young reach independence. It is perhaps no wonder, then, that a few birds have developed a way to avoid most of that expense by getting other birds to do most of the work. Brood parasites lay their eggs in the nests of other birds, which then hatch and rear them unwittingly.

The most widespread and abundant brood parasite in North America is the Brown-headed Cowbird. Dr. Mark Hauber studies Cowbirds and other brood parasites around the world, focusing on questions of recognition, social function, and the complex interactions between the parasites and their victims. He is a Professor at the University of Illinois in the Department of Animal Biology, School of Integrative Biology, where he runs the “Cowbird Lab” and conducts some fascinating research. He is also Harley Jones Van Cleave Professor of Host-Parasite Interactions in the Department of Evolution, Ecology, and Behavior. Dr Hauber addressed the central question of recognition: How does a Cowbird chick, raised entirely by another species, know it is a Cowbird?