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1 <br />i <br />1 <br />I <br />1 <br />1 <br />• <br />r <br />t <br />1 <br />I <br />1~ <br />1 <br />1 <br />i <br />Table 1 (Continued) <br />TAXA <br />Pelecypoda (clams) <br />Pisidium variabile <br />Musculium lacustre <br />NEh1ATODA (roundworms) <br />OLIGOCHAETA (worms) <br />Limnodrilus <br />Eiseniella tetraedra <br />HIRUDINEA (leeches) <br />Erpobdella triannulata <br />Helobdella stagnalis <br />PORIFERA (sponges) <br />Eunapius fragilis <br />TOTAL <br />NUh16ER OF SPECIES <br />DIVERSITY INDEX (D) <br />STATIONS <br />* 2 3 1 2 3 <br />Riffle Pool <br />5 5 -- -- 22 <br />43 500 1506 194 -- <br /> <br />240 1002 7759 517 108 <br />8 14 14 3 2 <br />2.34 2.25 1.86 1.18 0.73 <br />*Station 1 had no flowing water. <br />result of differing aquatic habitat. Station 1 was strictly beaver pond <br />habitat, whereas the other stations had flowing water. As is typical in small <br />intermittent streams with sandy substrate, chironomid larvae and tubificid <br />worms dominated the fauna in both riffles and pools. The highest benthic <br />density was found at Station 1. This may relate to the permanent nature of <br />the beaver pond as apposed to the intermittent sections downstream. The other <br />stations reflected their predominant habitats, i.e. high numbers of riffle <br />organisms at Station 3 which had more riffle habitat and high pool benthic <br />densities at Station 2 which had more pool habitat. <br />The riffle invertebrates at Station 2 were primarily filter feeding black <br />fly larvae (Simulium arcticum), although the amphipod Gammarus lacustris and <br />the tubificid worm Limnodrilus were relatively abundant. The density of <br />riffle invertebrates at Station 3 was much higher due to increased densities of <br />-7- <br />