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<br /> Table 1. Characteristics of the Colorado River Delta Floodplain in Mexico. Vegetation Zones were defined by floristic components based on ground <br /> surveys, while Land Cover Classes were determined by spectral analyses of satellite images; numbers after cover class refer to biomass intensity where 1 is highest <br /> and 4 is lowest. Estimates of bird diversity and density were based on the vertical vegetation structure and species composition using methods developed for lower <br /> Colorado River riparian ecosystems. <br /> Characteristics Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Total <br /> Area by Land Cover Class (ha): <br /> Riparian 1 170 248 1232 5199 5816 148 2274 15087 <br /> Riparian 2 NA 301 1136 1072 2479 826 474 6288 <br /> Riparian 3 NA 424 608 589 3837 2797 3142 11397 <br /> Riparian 4 NA 1075 1561 292 3999 5189 5722 17838 <br /> Wetland 1 NA 3 56 20 22 0 3429 3530 <br /> Wetland 2 NA 13 59 100 113 359 2379 3023 <br /> Distichlis Flats NA 0 8 29 16 442 377 872 <br /> Open Water NA 1 15 61 45 534 399 1055 <br /> Agriculture NA 29 159 26 4 0 17 235 <br />IV Total 246 2094 4834 7388 16331 10295 18213 59401 <br />00 Principal Overs tory Species Sg Pf/Sg Pf/Sg Tr/Pf/Sg Tr None None <br /> (>4.5 m)* <br /> Principal Midstory Species Pa Sg/Tr Tr/Bs Bs/Pspp/ Al Tr Tr Td/Tr <br /> (0.6-4.5 m)* <br /> Principal Understory Species None Ps Ps/Pf Psi Al Ao Dp/Ao Numerous <br /> (<0.6 m)* <br /> Vertical Structure III II III IV <br /> Avifauna Habitat Value: <br /> Estimated diversity ,of key summer birds <br /> Resident 9of9 7of9 8of9 9of9 9of9 NA NA <br /> Nonresident 90f9 80f9 80f9 80f9 6of9 NA NA <br /> Estimated density of summer birds per 40 ha <br /> Resident 279 140 432 224 159 NA NA <br /> Nonresident 163 132 198 150 143 NA NA <br /> *Sg=Salix goodingii, Pf= Populus fremontii, Tr= Tamarixramosissima; Bg= Baccharis salicifolia,' Pspp= Prosopis spp.; AI= A triplex lentilormis; Td= Typha <br /> domengensis; Ao= Allenrolfia occidentalis; Dp= Distichlis palmerii <br /> <br /> <br />