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<br />1,153/m2 and the benthos 948-6,318/mZ. The floodplain site had the highest densities <br />of plankton and benthos 135,240-415,493/m2 and 85,812-262,808/m2 respectively. <br />Densities also varied widely between species and age class of organism. <br />Numerically naupliaz copepod stages dominated all plankton samples comprising 49- <br />95 % of the organisms present. Nauplii dominated three of the eight benthic sample <br />periods ranging from 17-75 % of the total sample. Densities of benthic nauplii <br />exceeded those of the planktonic nauplii only in the river site and in the August <br />sample period of the Ouray backwater. The naupliaz stages demonstrate a preference <br />for a planktonic lifestyle. The portion of naupliaz stages in floodplain samples <br />remained relatively constant ranging from 60-72 % . The river had the highest at 95 % <br />of the plankton being nauplii. <br />Coneooda community structure <br />1 ida. Six species of cyclopoids were collected with three species being <br />dominant. The backwater had the greatest richness of cyclopoids with five. The <br />floodplain contained four species with higher densities than the backwaters. The river <br />contained three species, and these were rare. Two cyclopoid species showed a general <br />preference for the benthos, Microc~clons vari an ru ellu and Eucyclons a ili <br />(Table 4.). <br />ida. Six species of calanoids were present with two predominating. The <br />floodplain had the greatest species richness with four diaptomid species. The river had <br />three and the backwater two species. Some diaptomids were present in both the <br />12 <br />