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<br />- <br />- <br />Ql <br />= <br /> <br />Table 1. Historical events in the decline of endangered f'1Sh in the Colorado River basin. (continued) <br /> <br />Date Event <br /> <br />1991-92 Selenium elevated at Clifton Pond (Holley and Weston, 1995). <br /> <br /> 1991-93 <br /> 1991-95 <br /> 1992 <br /> 1994 <br />:I: 1995 <br />c <br />? 1995 <br />(Tl <br />n <br />~ 1999 <br />~ <br />U> <br />,.,. <br />a- <br />U> <br />t'l> <br />~ <br />~ <br />.:->' <br />Z <br />9 <br />SS' <br />-- <br />~ <br />~ <br />~ <br /> <br />Elevated selenium elevated in water, sediment, and biota in the Gunnison and Grand valleys (Butler el al., 1994, J 996). <br /> <br />Elevated selenium elevated in water, sediment, and biota in the San Juan River basin (Thomas el af., 1997). <br /> <br />Four Colorado pikeminnow found in Dolores River (Valdez el al., J 992). <br /> <br />Larval razorback sucker were sensitive to selenium in food chain (Hamilton el al., (996). <br /> <br />::c <br />i <br />s <br />Cl <br /> <br />Selenium elevated in water, sediment, aquatic invertebrates, and fIsh at WWSWA (Hamilton, unpublished data). <br /> <br />Last razorback sucker collected in upper Colorado River at WWSWA (McAda, personal communicatin). <br /> <br />Uncomphagre and Gunnison rivers basins and Grand Valley are biggest selenium contributors in Colorado River basin <br /> <br />(Engberg, 1999). <br />