. Bulletin. Natural history; Natural history. 344 Illinois Natural History Survey Bulletin Vol. 32, Art. 4. POWER PLANT Fig. 1.—Zooplankton sampling stations in Lake Sangchris. Stations 1, 2, 3, 4, 5, and 7 represent limnetic regions of tine lake basin, while A, B, C, D. and X represent littoral areas in the cooling loop and control arm. of species. The remaining portion was poured into a petri dish, and taxa not observed in the subsamples were recorded and computed. Identifications were made using a stereo dissecting microscope with 1:4 zoom range (lOx to 40x) and a trinocular compound micros
. Bulletin. Natural history; Natural history. 344 Illinois Natural History Survey Bulletin Vol. 32, Art. 4. POWER PLANT Fig. 1.—Zooplankton sampling stations in Lake Sangchris. Stations 1, 2, 3, 4, 5, and 7 represent limnetic regions of tine lake basin, while A, B, C, D. and X represent littoral areas in the cooling loop and control arm. of species. The remaining portion was poured into a petri dish, and taxa not observed in the subsamples were recorded and computed. Identifications were made using a stereo dissecting microscope with 1:4 zoom range (lOx to 40x) and a trinocular compound microscope at lOOx to 400x. Species identifications for the entire project were based on publish- ed keys by Ahlstrom (1940 and 1943), Pennak (1953), Brooks (1957 and 1959), Edmondson (1959), Wilson & Yeatman (1959), and Goulden (1968). All samples collected during 1975 were filtered, dried, and ashed at 500''C for 1 hour to determine estimates of the zooplankton standing crop in dry and ash-free biomass units (mg) per cubic meter. Approximations of the calorific value of the total biomass were computed from equations by Winberg (1971). An account of the total zooplankton species diversity was characterized by an index (d) based on the methodologies of Wilhm & Dorris (1968) and Patten (1962). RESULTS AND DISCUSSION COMMUNITY DYNAMICS Species Composition Twenty-nine species of rotifera and 38 microcrustaceans were collected from October 1973 to October 1976 (Table 1). Other constituents of plankton included. 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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