Microscoptic Studies of Invasive Plants and Animals

Leslie Harris of the Natural History Museum of Los Angeles County looks through a <br />
microscope to study a worm she collected, while James Carlton, the Director of Maritime Studies Program in CT confers with Charles Lambert of the University of Washington Friday Harbor Laboratory. Scientists study their samples in a lab after collecting in San Francisco Bay, THE most impacted ecosystem in the world. Since 1970, on average, one new species has been introduced every 24 weeks into the bay and surrounding estuaries. According to Dr. Andrew Cohen of the San Francisco Bay Estuary Institute, the bay has over 240 invasive species. Most of the fish found in the Bay's delta are non-native. All of these non-indigenous species have had a profound impact on the ecology of San Francisco Bay. <br />
Ballast water moved from port to port also spreads human pathogens--there is evidence <br />
that cholera bacteria that returned to Peru in 199 was the first outbreak in the Western <br />
Hemisphere in a century. It was brought by ships from Asia in ballast water.

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