Endangered Species

White, wild, and wonderful Before European settlement, as many as 150,000 trumpeter swans populated the Eastern United States. By the end of the 19th century, they were all gone, victims of pioneer settlers who wanted their meat, or of hatters, who wanted their feathers. (Hatters played a surprisingly large role in the conservation movement: their use of feathers from the great blue heron and the bald eagle helped spark the formation of the Audubon Society and …

…based on fecal coliforms," he says. "But they don't correlate with viruses, most bacteria, fungi, protozoa or helminths," all known causes of human disease. Rather than rely on indirect indications, Grimes says regulators should identify pathogens directly with molecular biological techniques. Can scientists assess ocean-borne diseases without flushing a toilet? . index.htmlindex.html3.html3.html ..index.html..index.html . There are 1 2 3 4 5 pages in this feature. Bibliography | Credits | Feedback | Search ©1999, University of Wisconsin, Board of Regents.