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Number <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />Insecticides and herbicides applied to the equivalent of 360 ha of <br />cropland in four agricultural areas ............................. 62 <br />Proportion of total area of each plant community within each year <br />in Parker II Division....... .................................. 70 <br />Percent and rate of change within plant communities among time <br />periods in Parker II Division ................................... 70 <br />Results of Mizoue's 1938-1960 and 1960-1983 models to predict <br />habitat changes in the Parker 11 Division ....................... 71 <br />Community/structure type and total area among years on the lower <br />Colorado River .................................................. 73 <br />Changes in riparian vegetation structure types among years on the <br />lower Colorado River .............. ............................ 75 <br />EA" <br />24 Patch size and divisions which were present for habitats in 1983.. 76 <br />25 <br />26 <br />27 <br />28 <br />29 <br />30 <br />31 <br />32 <br />33 <br />34 <br />Ranks for community/structure types used in Spearman rank <br />correlations tests for all habitats and first terrace habitats.. <br />Changes in emergent vegetation types among years on the lower <br />Colorado River .................................................. <br />Major aquatic invertebrate taxa recorded from the lower Colorado <br />River ........................................................... <br />Summary of diversity, numbers, and biomass of benthic <br />invertebrates from the lower Colorado River, 1974-1976.......... <br />Terrestrial arthropod taxa and their seasonal occurrence and major <br />riparian habitats used .......................................... <br />Cicada counts in riparian habitats on the lower Colorado River, <br />1982 and 1983 ................................................... <br />Cicada-eating birds before and after burning of a 30-ha saltcedar <br />stand ........................................................... <br />Primary habitats, distribution, and status of lower Colorado River <br />fish ............................................................ <br />Rank order of frequency, relative abundance, and biomass of <br />fishes .......................................................... 107 <br />Relative abundance of all fishes taken by seines and by <br />insecticide in canals of Yuma Valley, Limitrophe Division, lower <br />Colorado River, summer 1974 ..................................... 108 <br />78 <br />80 <br />88 <br />90 <br />94 <br />95 <br />95 <br />98 <br />x I I I