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PAaa <br />51 Status summary of 41 terrestrial bird species in agricultural <br />areas ........................................................... 164 <br />52 Density changes of riparian bird species at their maximum distance <br />traveled into agricultural areas from their density throughout <br />agricultural areas .............................................. 164 <br />53 Agricultural crops and features with which shorebirds were <br />associated with a frequency greater than expected with a random <br />distribution on transects ....................................... 167 <br />54 Estimated population changes in seven riparian bird species from <br />1976 to 1986 on the lower Colorado River ........................ 168 <br />55 Mammal distribution and habitat use on the lower Colorado River... 171 <br />56 Percent of females pregnant for four rodent species during each <br /> month across five years ......................................... 179 <br />57 Percent of captured rodents that were female by seasons within <br /> years, vegetation and structure types combined .................. 180 <br />58 Number of rodents caught in summer and winter during the riparian <br /> vegetation study, 1974-1979 ..................................... 181 <br />59 Average number of rodents caught per 100 trap nights in each <br /> agricultural field type on the Colorado River Indian <br /> Reservation ..................................................... 184 <br />60 Average number of rodent species, total captures per 100 trap <br /> nights, species diversity, and evenness in each agricultural <br /> area ............................................................ 185 <br />61 Summary of State and Federal species of special concern with <br /> stable populations on or near the lower Colorado River.......... 211 <br />A-1 Sample foliage density estimates used for calculating patchiness <br /> and foliage height diversity .................................... 251 <br />A-2 User's guide to classifying vegetation by dominant tree or shrub <br /> species present ................................................. 257 <br />A-3 Average number of trees per subplot in each of 23 recognized <br /> riparian habitat types along the lower Colorado River........... 259 <br />A-4 Loadings of 16 vegetation variables on the VARIMAX rotated axes <br /> for each of 4 principal components .............................. 261 <br />xv