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t <br />i <br />I <br />1 <br />1 <br />1 <br />I <br />I <br />I <br />1 <br />t <br />i <br />Table 1 (continued) <br />TAXA <br />Odonata (dragonflies and damselflies) <br />_- Ophiogomphus severus <br />CRUSTACEA <br />Amphipoda (scuds) <br />Hyalella azteca <br />Decapoda (crayfish) <br />Orconectes immunis <br />MOLLUSCA <br />Pelecypoda (clams) <br />Sphaerium striatinum <br />OLIGOCHAETA (worms) <br />Limnodrilus <br />TOTAL <br />STATIONS <br />1 2 3 1 2 3 <br />Riffle Pool <br />4 - - <br />11 - 11 <br />4 - - <br />86 188 1221 <br />3441 2517 11046 <br />- - 22 <br />452 237 883 <br />3401 2627 5320 <br />NUMBER OF SPECIES <br />DIVERSITY INDEX (D) <br />22 15 15 <br />2.90 2.57 2.68 <br />4 6 7 <br />0.94 1.53 1.01 <br />-12- <br />