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,c. i <br />• <br />Planktonic and Benthic Microcrustaceans from Floodplain <br />and River Habitats of the Green River, Utah <br />Lee W. Mabey <br />Department of Zoology <br />M.S. Degree, August 1993 <br />ABSTRACT <br />This study compares microcrustacean densities and species occurrence of benthic <br />and planktonic copepods and cladocerans in were taken during tithe summer o~991~. <br />habitats of the Green River, Utah. Samples <br />Samples were taken using a 1.27 cm diameter benthic core sampW~ ~ll ~ ~e <br />plankton tows with a 63 micron plankton net. In all, 28 specr ~ of calanoids, and <br />copepods are represented by six species of cyclopoids, six sped <br />two species. of harpacticoids. Fourteen species of cladocerans were collected. The <br />highest densities were found in the floodplain. Benthic densities ranged from 4,896- <br />23,059/m2 in backwater habitats, 948-6,138/m2 in river habitat, and 85,812- <br />262,808/m2 in the floodplain habitat. Plankton densiti 923 690 187 m3 in 3,353/nt~ <br />in the backwater, 317-1,312/m3 in the river, and 205, <br />floodplain. A comparison of the first sample periods for the floodplain (June), the <br />Ouray backwater (July), and river sites (July) indicate that the density of the benthos <br />was 41 times greater in the floodplain than in the other habitats and the plankton <br />density in the floodplain was 29 times greater than the backwater and 157 times <br />greater than the river. <br />. ~ _--- <br />CO1~~IlVIITTEE APPROVAL: <br />Dennis K. Shiozawa, Committee <br />R. Barnes, Committee Member <br />J /~ <br />. /S <br />Richard W. Baumann, Committee Member <br />