Laserfiche WebLink
<br />DRAFT-05/10/85 <br />and unquantified, and the nature of recent, ongoing <br />scientific data collection programs does not allow <br />determination of population status or trends. Even though <br />it is not possible to quantify cause/effect relationships, a <br />variety of factors have determined or influenced the present <br />condition and status of the endangered species: <br />~ Construction of Federal water resource and hydro- <br />- , ~ `~~ , -- electric projects has restricted the range of <br />~ F~ <br />-t' endangered species. <br />.~ <br />4 <br />{:" <br />. Federally sponsored eradication programs designed <br />to enhance conditions for game fish were directed <br />towards elimination of native species, and reduced <br />both populations and range. <br />Introduction of non-native sport fish which prey <br />upon native endangered species has reduced <br />populations of endangered species. <br />. Historical construction of irrigation projects by <br />public and private entities has restricted the <br />range of squawf ish . <br />Operation of Federal water and hydroelectric <br />projects has changed the temperature regime in <br />certain reaches of the Upper Basin, making it _ <br />unfavorable for native warm water fishes, even <br />though this has created excellent cold water <br />game fish habitat. <br />Large scale harvesting of the squawfish as a food <br />source in the early twentieth century, in both <br />Upper and Lower Basins, may have substantially <br />reduced populations. <br />5 <br />