Laserfiche WebLink
<br />(~j <br /> <br />t{' <br />.0> <br />~ <br />.0;1 <br />.&;) <br /> <br />. <br /> <br />. <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 />t. <br />( <br />€ <br />f <br />€.. <br />{. <br />~ <br />t. <br />€ <br />t.. <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 189], 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 />common 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 />t.. <br /> <br />t <br />t <br />~ <br />~ <br />t. <br />t. <br />l <br />t <br />t. <br />~ <br />t. <br />t. <br />t. <br />t. <br />t <br />t <br />t. <br />t. <br />t. <br />t. <br />t. <br />t. <br />t <br />t <br />~. <br />t. <br />t. <br />t. <br />t. <br />t. <br />t <br />t <br />e <br /> <br />Draft Final Tributary Report <br />Miller Ecological Consultants, Inc. <br /> <br />January 31,2000 <br />Pageii <br />