Vydavatel US Fish and Wildlife Service, Department of the Interior
Datum vydání před téměř 10 roky
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Recent investigations have documented degraded water quality conditions in Las Vegas Wash and Las Vegas Bay of Lake Mead, Clark County, Nevada Bureau of Reclamation 2001; Snyder et al. 1999; Covay and Beck 1998; Covay and Leiker 1998 Bevans et al. 1998, 1996. The degradation of water quality has adversely affected the quality of fish and wildlife habitat associated with these areas. Environmental degradation has affected Department of the Interior trust resources, including National Park Service and Bureau of Reclamation managedlands. Effects to DOI trust fish and wildlife resources, including three endangered species and a variety of migratory bird species, are still under investigation. However, the occurrence of a variety of environmental contaminants in water, sediment, and biological tissues from Las Vegas Wash and Las Vegas Bay indicate that environmental conditions are not conducive to healthy populations of fish and wildlife. Contaminant accumulation, tissue abnormalities, and evidence of reproductive effects endocrine disruption have been identified in fish from Las Vegas Wash and Bay Goodbred et al. 1999; Bevans et al. 1998, 1996; Patino et al in review. In 1998, the U.S. Geological Survey USGS Biological Resources Division and the U.S. Fish and Wildlife Service Service initiated a joint investigation to assess contaminants associated with Las Vegas Wash and effects to wildlife. The investigation was expanded in 2000 to address concerns specific to DOI trust resources. The objectives of the Services components of the investigation included: 1 reviewing existing data to assess the existence and degree of threats to fish and wildlife, 2 assessing organochlorine OC compounds and trace elements in avian eggs, 3 assessing razorback sucker Xyrauchen texanus exposure to endocrine disrupting compounds and other contaminants, and 4 assessing the potential for downstream impacts to endangered fishes and critical habitat.