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<br />., <br />,,~) <br />1'.:> <br />, ., <br />c_) <br /> <br />0) <br /> <br />been stocked in the La Plata River prior to this time, most non-native species were <br />probably not established over a widespread area. <br /> <br />The expansion of non-native fish in tributaries of the upper San Juan River has been <br />concurrent with a decline in certain native fish species. There have been several <br />historical reports that suggest that native fish may have been relatively abundant in areas <br />where recent surveys indicated they were rare or nonexistent (Jordan 1891, Koster 1957, <br />Dean 1961, Olson 1962a), Several researchers have also commented on the decline of <br />certain native species (Sublette 1977, Platania and Bestgen 1988, Platania and Young <br />1990). In fact, the data presented here suggests that roundtail chubs may have been <br />cornman in some reaches of the Animas River. A review of historical fish surveys <br />suggests that the establishment of species (and species composition) is a dynamic <br />process, Future surveys will be necessary answer more questions regarding the balance <br />of native and non-native fish fauna in tributaries of the upper San Juan River. <br /> <br />Draft Final Tributary Report <br />Miller Ecological Consultants, Inc. <br /> <br />January 31, 2000 <br />Page ii <br />