Ecology and Evolutionary Biology Commons^™

An Evaluation Of Benthic Macroinvertebrate Community Structure And Sediment Toxicity In Lake Taylorville, Sanhita Datta

Masters Theses

Sediments act as a "sink" for xenobiotics which can be accumulated by a variety of organisms and thereby enter the food chain contaminating fish, wildlife and humans. Although the chemical nature of these substances can be known by direct chemical analysis of the sediments, the significance of the contaminants and their bioavailability should be determined through bioassay techniques. A survey of the benthic macroinvertebrates of Lake Taylorville, a reservoir in central Illinois which is fed by two rivers that drain a primarily agricultural area, revealed a rather depauperate fauna. Subsequent studies were conducted in order to identify the underlying cause …

Predator Deterrence In The Central Newt, Notophthalmus Viridescens Louisianensis (Wolterstorff) With Notes On Salamander Antipredator Strategies, Malcolm Mccallum

Masters Theses

The effectiveness of the skin secretions of Notophthalmus viridescens as a predator deterrent has been well documented. Still, there have been documented cases of predation on this salamander. This study investigates the ability of a variety of herptiles to feed on N. viridescens louisianensis.

In the first experiment, plethodonts and efts were fed on alternate weeks to snakes. Latency of response, anatomical location of predator attack, and behaviors displayed by predators and prey were recorded during each trial.

In the second experiment, tongue flick frequency by T. sirtalis to the essence of live N. viridescens louisianensis, Eurycea cirigerra …

Artificial Cavity Box Use By Eastern Screech Owl, Otus Asio, Lori A. Davis

Masters Theses

Screech owl use of 29 artificial cavity boxes placed in wooded habitat on a 14.6 hectare study area in east central Illinois was monitored from 1975 through 1993. A total of 28 screech owls were captured a total of 155 times. Two to 4 adults were usually present and 3 broods were reared in the boxes. The time between first and last capture of birds taken 4 or more times ranged from 270 to 2589 days (average 1740 days). Home range of 5 owls captured 8 to 17 times ranged from 0.45 to 6.0 ha. Cavity boxes were used more …

The Relative Weight (Wr) Condition Index As A Predictor Of Growth, Prey Abundance And Environmental Conditions, Hongsheng Liao

Masters Theses

We evaluated the relative weight (W_r) condition index for assessment of growth, prey availability and environmental conditions in fish populations. Standard weight (W_s) equations for pumpkinseed (Lepomis gibbosus) and golden shiner (Notemigonus crysoleucas) from 302 pumpkinseed and 285 golden shiner populations, with well over 10,000 fish of each species, were developed with regression-line-percentile (RLP) technique. The proposed W_s equation in metric units for pumpkinseed is log₁₀W_s = -5.179 + 3.237 log10TL, and for golden shiner is log10W_s = -5.593 + 3.302 log10TL. The English-unit versions of these equations were also developed. …

Zooplankton Community Structure As A Function Of Abiotic And Biotic Factors Prior To A Multiphased Restoration Effort, John H. Ensign Jr.

Masters Theses

Lake Taylorville, an impoundment on the South Fork of the Sangamon River, is located just south of Taylorville in Christian County, Illinois. The tributaries of this reservoir drain primarily agricultural areas and contribute to degradation of the reservoir through excessive sediment and nutrient loading. A restoration project is underway which involves construction of sediment basins and dry dams. Analysis of the crustacean zooplankton community has formed an integral part of an intensive limnological investigation of the reservoir during the initial stages of the restoration effort. Seasonal variation in the composition, and density of the major groups was observed. Rotifers (Brachionus …