Spatial Distribution of Planktonic Copepoda and Cladocera in Red Rock Reservoir, Iowa, Summer, 1972

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Show simple item record McGrath, Michael John 2010-01-11T16:12:28Z 2010-01-11T16:12:28Z 1973-08
dc.identifier.other 1973 .M173
dc.description 34 leaves. en_US
dc.description.abstract The problem. The measurement of spatial distribution of Copepoda and Cladocera in Red Rock Reservoir, Iowa, summer, 1972, was undertaken. Water temperature, Secchi disk, and total water depth readings were also measured. Procedure. Volumetric samples of free-swimming zooplankton were collected at weekly intervals from June 6 to September 8, 1972. Collections were made at three stations on each of four transects representing different areas of the reservoir. Samples were obtained from one meter intervals from the surface to three meters. Findings. Sater temperature varied from a low of 18.5 C to a high of 30.0 C. Secchi disk readings ranged from 6 to 70 cm. Maximum readings were obtained near the dam and decreased towards the headwaters. Retention time varied from 3.9 to 55.6 days with a study mean of 10.7 days. A gradual increase in zooplankton numbers was noted from June 16 until a high was reached on July 5 (356 organisms per liter). The numbers then rapidly decreased until a low was reached on August 15 (0 organisms per liter). The dam transect always had the highest numbers of organisms with headwater transects having lower numbers of organisms. Eight species of zooplankton were identified during the study. Conclusions. Highest zooplankton populations occurred near the dam with smaller numbers present up reservoir. Numbers of zooplankton per liter and retention times were lower than during a 1970 study. Retention time was the main controlling factor on zooplankton development. No correlations were found between zooplankton numbers and temperature, light penetration, and depth. Recommendations. More station sites and more frequent sampling could enable the study of horizontal distribution of zooplankton. Monitoring reservoir inflow and outflow would enable the determination of population development within the reservoir. The interaction of zooplankton with phytoplankton and macrophytes should be investigated. en_US
dc.language.iso en_US en_US
dc.publisher Drake University en_US
dc.relation.ispartofseries Drake University, School of Graduate Studies;1973
dc.subject Copepoda en_US
dc.subject Cladocera en_US
dc.subject Water temperature en_US
dc.subject Zooplankton en_US
dc.subject Red Rock, Lake (Iowa) en_US
dc.title Spatial Distribution of Planktonic Copepoda and Cladocera in Red Rock Reservoir, Iowa, Summer, 1972 en_US
dc.type Thesis en_US

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