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<br />downstream from Lee's Ferry and about 92 straight line kilometers (57 straight <br /> <br />line miles) southeast of the two known Utah populations (Spamer and Bogan <br /> <br />1992a, 1992b). No other historical populations are know to have existed. <br /> <br />C. Population BioloQY <br /> <br />The Kanab ambersnail is a rare endemic snail restricted to permanently wet <br />areas within small wetlands of the Colorado Plateau. Its population at Three <br />Lakes Canyon.was estimated to contain 100.000 individuals in June 1990. <br />During 1990 and 1991 this population experienced major habitat losses due to <br />wetlands destruction and, to a limited extent. livestock trampling. Only <br />three individuals were counted after an intensive search of the habitat of its <br />smaller Utah population in September 1990 and none have been observed since. <br />The smaller Utah population numbered over 300 individuals in the early 1980's. <br />its habitat has been dewatered within the past 10 years (Clarke 1991. U.S. <br />Fish and Wildlife Service 1992). The Arizona population is difficult to <br />estimate but is thought to be considerably less that the number in Utah. <br />Great diversity in' the size of individuals within its population early in the <br />active growing season indicate that reproduction probably occurs throughout <br />all warm. wet periods of the year and that the Kanab ambersnail overwinters as <br />juveniles. sub-adults. and adults (Clarke 1991). It is probable that the <br />Kanab ambersnail has a 1 ife span of about 12 to 15 months (Cl arke 1991). <br /> <br />5 <br />