Federal-State Conflicts over the Colorado River

Selenium impacts on razorback sucker, Colorado: Colorado River III. Larvae.

Razorback sucker (Xyrauchen texanus) larvae from adults exposed to selenium at three sites near Grand Junction, Colorado, for 9 months were used in a 30-day waterborne and dietary selenium study. Selenium concentrations in water averaged <1.6 microg/L from 24-Road, 0.9 microg/L from Horsethief, 5.5 microg/L from Adobe Creek, and 10.7 microg/L from the North Pond. Selenium in dietary items avera...

The Lower Colorado River : A Western System

--A historic look at the Colorado River will illustrate the dras­ tic effects of human activity on most Western rivers. Engineering features for the management of water and electric power have resulted in increased evapora­ tion, associated salinity, and other physicochemical changes; drastic reduction in many native plant and animal populations; increasing populations of intro­ duced species; ...

Stocking of Endangered Razorback Suckers in the Lower Colorado River Basin over Three Decades: 1974–2004

—The razorback sucker Xyrauchen texanus was historically widespread and abundant throughout the larger streams of the Colorado River basin, ranging from Sonora, Mexico, to Wyoming. The species was federally listed as endangered in 1991 because it has been extirpated from most of its range. Its decline is attributed to habitat loss and predation by nonnative fishes. Thirty years of federal and s...

Federal preemption of state regulation over air ambulances.

Federal information policies in the 1980's: Conflicts and issues

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