Terrestrial and Aquatic Biological Inventory; Meredosia Lake and Willow Creek Drainage and Levee District: Cass and Morgan Counties, Illinois.
Final rept. 18 May-15 Jul 82,
FISH AND WILDLIFE SERVICE ROCK ISLAND IL
Pagination or Media Count:
This study describes the habitats and biological populations present in Meredosia Lake Drainage and Levee District during the period of May 18, 1982 to July 15, 1982. Eight habitats were identified and quantified, with cropland 77.2 percent and floodplain forest 12.7 percent composing the highest percentages. Terrestrial evaluations were based on 28 reconnaissance sites and vegetation sampling in floodplain forest habitats. Flora and fauna occuring within the study area were identified. Endangered and threatened species that may occur within the District were listed. The majority of organisms present in the terrestrial habitats were species common in this portion of Illinois. Aquatic resources in the study area have been severely impacted by drainage and channelization. The inventory of aquatic resources was based on 16 reconnaissance sites and six sampling stations. Water quality parameters, plankton, benthic macroinvertebrates and fish populations were sampled using standard collecting methods. Phytoplankton populations were generally low, except for a borrowditch area. The most common zooplankton taxa included diatoms, Cladocera, copepods and chironomids. Oligochaetes and chironomids dominated the benthic populations. The most often collected fish species were carp, shiners and centrarchids. It is unlikely that any endangered species are present in the study area. Author