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<br />1 5. Mammals <br />' Several mammal species have been observed <br />Preserve and are listed below. No known <br />have been undertaken within the Preserve. <br />' Mule deer (Odocoileus hemionus) <br />Coyote (Canus latrans) <br />Beaver (Castor canadensis) <br />' Muskrat (Ondatra zibethicus) <br />Rock squirrel (Citellus variegatus) <br />Bats, unknown species <br /> <br />within the <br />surveys of mammals <br />Conclusion: Beaver dam activity may pose a problem with any <br />development of water control structures. <br />6. Endangered Species <br />The bald eagle (Haliaeetus leucocephalus) is listed as <br />a USFWS endangered species. Bald eagles have.been <br />observed within the Preserve, but no known nest sites <br />exist. More information.is needed on use of the site <br />by bald eagles. <br />The peregrine falcon (Falso peregrinus) is listed as a <br />USFWS endangered species. Peregrine falcons nest in <br />the cliff area above the Colorado River near the <br />southeast corner of the Preserve. Nest sites are not <br />occupied every year. (More information is needed from <br />Nelson on peregrine activities in the Preserve.) <br />No other endangered species are known to potentially <br />occur in the Preserve. <br />Conclusion: There are no anticipated impacts to bald eagles <br />or peregrine falcons by razorback sucker habitat enhancement <br />activities. It is hoped that enhancement of razorback <br />sucker habitat will benefit other endangered fish including <br />bonytail chubs, Colorado squawfish, and humpback chubs. <br /> <br /> <br />1 <br /> <br /> <br />III. CONCEPTUAL ECOLOGICAL MODEL <br />Generally, the input of terrestrial organic matter provides the <br />basis for energy in headwater streams (Vannote et al. 1980). <br />Large rivers, such as those of the upper basin, depend upon fine <br />particulate organic matter from upstream reaches for basic <br />productivity (Vannote et al. 1980; Sedell and Richey 1989). <br />Although detailed ecological studies of the various habitats in <br />the upper basin have not been made, inferences can be drawn from <br />the published literature. <br />24 <br />