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Last modified
8/11/2009 11:32:57 AM
Creation date
8/10/2009 4:28:52 PM
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UCREFRP
UCREFRP Catalog Number
7962
Author
Wolz, E. R. and D. K. Shiozawa.
Title
Benthic Invertebrates from the Green River, UT, Benthic Macroinvertebrate Communities of the Green River, at the Ouray National Wildlife Refuge - master's theses.
USFW Year
1993.
USFW - Doc Type
Brigham Young University,
Copyright Material
NO
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DISCUSSION <br />Nematoda <br />The role of free living nematodes in aquatic systems has not been extensively <br />studied. However, aquatic nematodes are known to be microbotrophic, predaceous, and <br />and or parasitic during one or more of their life stages (Poinar 1991). Due to the <br />scarcity of adequate keys and their small size, nematodes are not enumerated or listed <br />beyond the phylum designation in most studies. In studies of aquatic systems where <br />nematodes are grouped as one taxa', the highest densities have been found in lakes. <br />Strayer (1985) and Nalepa and Quigley (1983) reported that nematodes comprised 60% <br />and 80% respectively of all benthic metazoans in Mirror Lake and Lake Michigan with <br />a means of 680,000/m2 (Mirror lake) and 260,000/m2 (Lake Michigan). In contrast, <br />Palmer in Goose Creek (1990) and Gladden and Smock (1990) on the floodplain of <br />Colliers Creek reported that nematodes comprised a much smaller percentage (6% of <br />total invertebrates) and occurred at diminished densities (1,000 - 15,000/m2 and 1746/m2 <br />respectively) in lotic systems. <br />In our study, nematode density estimates from the seasonally inundated wetland <br />June sample and river channel July and August samples ranged from 2,421 - 24,881/m2. <br />These densities are comparable to densities previously reported from lotic systems <br />(Palmer 1990 and Gadden and Smock 1990). Density estimates for all other sites and <br />dates (54,872 - 302,603/m2) are more similar to densities in lentic habitats. This may <br />be due to the more stable environment provided by calmer waters and smaller sediment <br />size in the various habitats. In their study of White Clay Creek, Bott and Kaplan (1989) <br />13
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