. Bulletin. Natural history; Natural history. Aug. 1981 Webb: Benthic Macroinvertebrates 359 bottom consisted of fine silt with allochthonous organic detritus. The bottom sediment in the discharge channel from the power plant was covered with a layer of silicate slag. For purposes of comparison with a lake not receiving heated effluent, the benthic community of Otter Lake was examined from April through November 1975 and from April through September 1976. Otter Lake is a water supply reservoir km (6 miles) west of Girard, Macoupin County, Illinois, and lies on the same sediment topography
. Bulletin. Natural history; Natural history. Aug. 1981 Webb: Benthic Macroinvertebrates 359 bottom consisted of fine silt with allochthonous organic detritus. The bottom sediment in the discharge channel from the power plant was covered with a layer of silicate slag. For purposes of comparison with a lake not receiving heated effluent, the benthic community of Otter Lake was examined from April through November 1975 and from April through September 1976. Otter Lake is a water supply reservoir km (6 miles) west of Girard, Macoupin County, Illinois, and lies on the same sediment topography as Lake Sangchris. Benthic samples also were collected during 1974 and 1975 in the East Branch ( km south of Bulpitt) and the West Branch ( km north of Zenobia) of Clear Creek above the impounded waters of Lake Sangchris to gain insight into the probable composition of the stream fauna prior to the stream's impoundment. MATERIALS AND METHODS The average biweekly bottom temperature and oxygen concentration for the heated, or discharge arm, (stations 5, 4, and 3) and unhealed or intake- and control-arm, areas (stations 2, 1, and 7) of Lake Sangchris from 1973 through 1976 have been extracted from data collected by Brigham (1977). Monthly benthic collections in Lake Sangchris began on 19 September 1973. DISCHARGE POWER CHANNEL PLANT Fig. 1 —Lake Sangchris sampling stations for benthic Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
