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BUTTERFLY ASSEMBLAGES ALONG THE LOWER COLORADO RIVER <br />"0'•'fo' Davis Dam <br />~%\ <br />•• Havasu National <br />Wildlife Refuge <br />Needles <br />-~,.._ <br />Lake Havasu City gill Williams National <br />Parker Dam Wildlife Refuge <br />Headgate Rock Dam Blii <br />0~ Parker N'~//ids A. <br />~ No Name Lake ~~ <br />CALIFORNIA Q' <br />Palo Verde Dam <br />Blythe • <br />Cibola National <br />Wildlife Refuge <br />0 <br />0 <br />U <br />_ ARIZONA <br />U.SA. <br />- --~~_ _ Yuma <br />``` USA <br />M ~~ <br />~~~ <br />0 t00 km <br />• Cities <br />~ Study sftes <br />487 <br />Figure 2. Map of study area showing segment of Colorado River from Davis Dam to its mouth in Gulf of California. Not all dams <br />are shown <br />• We predicted that maturing planted landscapes would provide more diverse butterfly habitat and that the <br />probability of butterfly colonization would increase with site age. We also used butterfly assemblages to <br />explain whether and in what manner attributes of revegetated patches of disconnected floodplain (i.e., <br />floodplain no longer subjected to river overflow) might differ from those of natural riparian landscapes. <br />METHODS AND MATERIALS <br />Study areas <br />Eight sites along the lower Colorado River in Arizona and California (Figure 2) were surveyed. Five <br />were examined during 1994-1997: the Bill Williams River delta (in Bill Williams National Wildlife <br />Refuge), which contains the best example of a naturally functioning cottonwood/willow ecosystem along <br />Copyright ©1999 John Wiley & Sons, Ltd. Regut. Rivers: Res. Mgmt. 15: 485-504 (1999) <br />