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Clearly, the situation described above is serious. However, <br />there is a strong sense that there are still opportunities in <br />Colorado for proactive measures to succeed in achieving an <br />acceptable level of protection of our remaining native flora and <br />fauna. Colorado is blessed with substantial ecological diversity <br />that is brought about by the compression of many different life <br />(or vegetative) zones into relatively small geographic areas. <br />There are six such zones present in Colorado as a result of the <br />large elevation differences that occur in our state -- alpine above <br />11,550 feet; subalpine above 9,500 feet, montane above 8,000 <br />feet; foothills above 5,500 feet; high plains on the eastern <br />slope; and upper sonoran shrublands on the western slope. There <br />are 13 to 15 major ecosystem types or ecological subregions <br />distributed through these six life zones. <br />Moreover, Colorado's rather extreme elevation changes generally <br />occur in relatively small watershed areas distributed throughout <br />the state. Therefore, our state enjoys a natural redundancy of <br />ecosystem types, especially within the life zones occurring <br />between the foothills and the alpine regions. This redundancy <br />strengthens the opportunities for protection of Colorado native <br />species, if proactive efforts are initiated. <br />Finally, it is important to note that nearly 29 million acres, or <br />43 percent of the land in Colorado is publicly owned. Relative <br />to states where a much higher percentage of land is privately <br />owned, this further increases the opportunities for natural <br />resource management that will protect Colorado native species. <br />III. Federal Regulation <br />A. Endangered Species Act <br />Biologists often describe declining aquatic species and <br />communities in terms of population viability and the extent, <br />functionality, and connectivity of habitat. Most of the rest of <br />the public is not as well versed in the scientific methods for <br />measuring of biological health. Nevertheless, Colorado citizens <br />are becoming increasingly familiar with declining aquatic species <br />and communities, though through a decidedly different <br />terminology; namely, the legal and regulatory jargon of the <br />federal Endangered Species Act (ESA). <br />The ESA was first passed by Congress in 1973 with amendments in <br />1978, 1979, 1982 and 1988. The United States Fish and Wildlife <br />Service is the primary agency responsible for administration of <br />the ESA. Once a species is federally listed, the Service assumes <br />the primary management responsibility for recovery. Other <br />federal agencies, including the Bureau of Reclamation, the US <br />Army Corps of engineers, the Forest Service, National Park <br />Service and Bureau of Land Management must adhere to practices <br />4 <br />