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Faa g 27 A. Mean annual salinity at Imperial Dam. B. Mean annual flow at Imperial Dam .................................................... 38 28 Means of conductance upstream to downstream in the Colorado River mainstream ...................................................... 41 29 Average densities of birds in different orchard types ............. 61 30 Association between insecticide application and avian densities... 63 31 Recreational uses along riparian corridors include concentrations of people operating or using rafts, boats, and off-road vehicles 64 32 Change in plant communities in the Parker II Division from 1938- 1986 ........................... ................. 69 33 Insect biomass among riparian habitats (excluding cicadas)........ 92 34 Diagram showing habitat overlap between side-blotched lizard, zebra-tailed lizard, and western whiptail ....................... 150 35 Rodent species diversities in four community types in the lower Colorado River Valley ........................................... 178 36 Summary of the vegetation relationships of eight species of rodents found in riparian vegetation along the lower Colorado River ........................................................... 182 37 Clearing a site of plant competitors is essential for a successful revegetation project as at Cibola National Wildlife Refuge...... 219 38 Augering holes to the water table and collecting soil, water, and salinity data are all essential steps in determining the growth potential of native riparian trees and shrubs ................... 219 39A Above-ground drip irrigation is the least expensive and most efficient means for watering trees .............................. 220 39B Same area as in 39A 1 year after planting of shrubs ............... 220 40A Aerial oblique of Cibola National Wildlife Refuge revegetation site after clearing but before planting ......................... 221 40B Aerial oblique of same site 1 year after planting ................. 221 41A Revegetation of cottonwoods on dredge spoil 4 months after planting ........................................................ 222 41B Same trees 1.5 years after planting ............................... 222 x