The Invaded Estuary: Exotic Species in San Francisco Bay; given by Andrew N. Cohen, Senior Scientist and Director of the Biological Invasions Program, San Francisco Estuary Institute. The San Francisco Bay Estuary is one of the most highly invaded aquatic ecosystems in the world. The arrival of exotic organisms has altered its species composition, food webs and population dynamics, and exotics now account for most of the species, individuals and biomass across many of the estuary's habitats. Mr. Cohen discusses the state of these invasions, how they've arrived, what changes they've caused, and what if anything can be done about them.

Introduction to American Studies