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<br />912 <br /> <br />Environ. Toxico/. Chem. 20, 2001 <br /> <br />populations currently inhabit less than 25% of their former <br />range [1]. There will be no refugia for Colorado pikeminnow <br />if remaining habitat becomes unsuitable for any life-stage re- <br />quirement. Given that many human-induced changes respon- <br />sible for decline of Colorado pikeminnow are still present in <br />the Colorado River Basin, it is important to prevent further <br />anthropogenic degradation and be proactive about predicting <br />how existing conditions may change in the future. <br /> <br />Acknowledgement-We thank K.R. Bestgen for statistical advice and <br />encouragement. J.E Fairchild, K.E. Klima, and three anonymous re- <br />viewers provided comments that improved the manuscript. PJ. Sikoski <br />provided laboratory assistance. 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