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Articles 1 - 11 of 11

Full-Text Articles in Life Sciences

Predation Risk And Feeding Site Preferences In Winter Foraging Birds, Yen-Min Kuo Jan 1992

Predation Risk And Feeding Site Preferences In Winter Foraging Birds, Yen-Min Kuo

Masters Theses

A foraging animal's choice of feeding location may represent a trade-off between maximizing its energy or nutrient intake and avoiding predation. In the present study, two hypotheses were investigated to test the influence of predation risk on feeding site preferences of birds: 1) there are differences among the preferences of feeding heights of birds, 2) the magnitude of preference increases with increasing predation risk found in different habitats. In my study site, three feeding stations (located in the woods, the woods/field edge, and an open field) each containing three feeders (0 m, 1.5 m, and 3 m ...


A Herpetofaunal Survey Of The Braidwood Dunes And Savanna Nature Preserve, Daniel J. O'Connell Jan 1992

A Herpetofaunal Survey Of The Braidwood Dunes And Savanna Nature Preserve, Daniel J. O'Connell

Masters Theses

A herpetofaunal survey was conducted on two sand prairie areas in Will Co., IL.; The Braidwood Dunes and Savanna Nature Preserve (BD+S), and Sandridge Savanna. Drift fences with pitfall traps, herpetological attractor panels, aquatic hoop traps, and manual collecting were used to sample the two preserves. A species list was compiled, and the habitat preferences and relative abundance of each species present were determined. The species list was compared with the species lists of other Illinois sand areas and the Nebraska sandhills. Guilds represented by the herpetofaunae of each area were also compared.

Seventeen species were recorded at BD ...


Diet Content And Overlap Of Six Species Of Turtle Among The Wabash River, Lori Pierce Jan 1992

Diet Content And Overlap Of Six Species Of Turtle Among The Wabash River, Lori Pierce

Masters Theses

A community of six species of turtles from the Wabash River and its backwaters was studied to determine diet composition of each species and amount of dietary overlap among species. Species studied included: Trionyx muticus, Trionyx spiniferus, and Graptemys ouachitensis in the river; Trachemys scripta and Chrysemys picta in both the river and backwaters; and Chelydra serpentina in the backwaters only.

Trionyx muticus, T. spiniferus, and G. ouachitensis all belong to a guild that specializes on aquatic insects. The highest diet overlap (69.6%) was between the two softshells, T. muticus and T. spiniferus. Coexistence is possible because T. spiniferus ...


Size-Specific Growth Of Illinois Stream Fishes: Relationships With Biotic And Abiotic Habitat Variables, John H. Putman Ii Jan 1992

Size-Specific Growth Of Illinois Stream Fishes: Relationships With Biotic And Abiotic Habitat Variables, John H. Putman Ii

Masters Theses

Growth is an important component in the ecology and management of stream fisheries. Growth of stream fish has received relatively little attention and relationships with habitat variables are largely unknown. We quantified growth of juvenile and adult size classes of bluegill (Lepomis macrochirus), common carp (Cyprinus carpio), channel catfish (Ictalurus punctatus), largemouth bass (Micropterus salmoides), rock bass (Ambloplites rupestris), and smallmouth bass (M. dolomieui) from Illinois streams. Growth rates for each species fell within ranges previously reported for lakes and rivers in the United States although they averaged slightly lower. Within each species except channel catfish, growth of juvenile and ...


Effects Of Hypoxia On Egg Development In The Giant Waterbug (Belostoma Flumineum), Miki Furuya Jan 1992

Effects Of Hypoxia On Egg Development In The Giant Waterbug (Belostoma Flumineum), Miki Furuya

Masters Theses

I quantified the oxygen requirements of developing eggs and the adaptive significance of male brooding behavior in the giant waterbug (Belostoma flumineum). Egg pads brooded by males, and egg pads experimentally removed from the dorsa of males and maintained in a metabolic shaker, were tested for hatching success in four oxygen treatments (5%, 8%, 10% and 21%-control) in a closed laboratory system. All of the control male brooded egg pads, and 100% of the eggs/pad, hatched whereas none of the egg pads hatched in the 5% oxygen treatment. Fifteen of 20 (75%) male brooded egg pads in the ...


A Biosystematic Study Of Panus Conchatus (Basidiomycetes; Agaricales), James Edward Johnson Jan 1992

A Biosystematic Study Of Panus Conchatus (Basidiomycetes; Agaricales), James Edward Johnson

Masters Theses

As part of a biosystematic study of Panus conchatus (Bull.: Fr.) Fr., North American and European herbarium specimens from the Field Museum and the University of Michigan were examined and a description of the taxon prepared. Tissue and single spore isolates were obtained from basidiocarps collected in Illinois. Single and polyspore isolates were obtained from a collection made in Switzerland by R. H. Petersen. Culture mat analyses were completed on several media and the taxonomic value of cultural characters assessed. Based on this study, the identification of somatic cultures by cultural characteristics is unlikely. Single spore isolates from the Illinois ...


Effects Of Forest Fragmentation On Neotropical Migrant Landbirds In East-Central Illinois, Eric Thomas Linder Jan 1992

Effects Of Forest Fragmentation On Neotropical Migrant Landbirds In East-Central Illinois, Eric Thomas Linder

Masters Theses

No abstract provided.


The Effects Of Plant Growth Regulators With The Addition Of A Surfactant On Rough Turf, Jennie Rebecca Chlumsky Jan 1992

The Effects Of Plant Growth Regulators With The Addition Of A Surfactant On Rough Turf, Jennie Rebecca Chlumsky

Masters Theses

Three plant growth regulators (Embark, Event and Oust) and two surfactants (crop oil and non-ionic surfactant) were evaluated for their effectiveness in controlling the growth of rough turf at Coles County Airport. The PGRs were evaluated for control of turf height, suppression of seedheads, phytotoxicity and weed control at two, four, six and eight weeks after spraying. Embark and Event were applied at a rate of 0.43, 0.64 and 0.86 kg/ha and Oust was applied at a rate of 0.01 and 0.02 kg/ha. The surfactants were applied at 1% of solution. All PGRs ...


Evaluation Of Puccinia Convolvuli (Pers.) Cast. As A Biological Control Of Calystegia Sepium (L.) R. Br., Jonathan C. Beener Jan 1992

Evaluation Of Puccinia Convolvuli (Pers.) Cast. As A Biological Control Of Calystegia Sepium (L.) R. Br., Jonathan C. Beener

Masters Theses

A rapid detached leaf assay technique was developed to test various pathogens for biological control of hedge bindweed (Calystegia sepium). Detached leaves with complete petiole were excised, surface sterilized in 70% ethanol, washed with sterile distilled water, and placed in sterile petri plates with sterile filter paper moistened with 5ml sterile distilled water. Media, leaf size, temperature and light duration were then tested for conditions that would optimize maximal leaf longevity. The best conditions derived were: 12/12 hrs. light, dark, period, 30°C, sterile distilled water medium and leaves of any size. Twenty-five isolates recovered from bindweed lesions were ...


The Effects Of Beaver-Created Wetlands On Surface Water Quality Of Streams And Rivers In Dupage County, Illinois, Brian Conklin Jan 1992

The Effects Of Beaver-Created Wetlands On Surface Water Quality Of Streams And Rivers In Dupage County, Illinois, Brian Conklin

Masters Theses

Dam construction by beavers creates wetlands which have the potential to improve water quality, especially in areas near urban centers. However, beaver dams may also cause flooding problems which can result in the removal of the beaver(s) and the destruction of their dam. A further understanding of how beaver-created wetlands affect water quality will provide additional data which can be utilized in beaver management decisions.

In this study, 41 chemical parameters were examined from water taken above and below beaver-created wetlands that existed in DuPage County, Illinois between May and September 1991. This study was designed to examine the ...


Leakage Of Solutes From Imbibing Seeds Of Supersweet Corn Cultivars That Differ In Tolerance To Low Germination Temperatures, Linda Kull Jan 1992

Leakage Of Solutes From Imbibing Seeds Of Supersweet Corn Cultivars That Differ In Tolerance To Low Germination Temperatures, Linda Kull

Masters Theses

Supersweet types of sweet corn (Zea mays L. var rugosa) with shrunken-2 endosperm are preferred by consumers because of their extra sweetness and postharvest retention of good flavor. However, their acceptance by growers is hindered due to reduced field emergence, especially in cold soils. This reduced emergence is related to seed quality. To examine differences between supersweet corn cultivars which are tolerant and sensitive to low temperatures, two cultivars were chosen based on their emergence in the field at low temperatures (10-15 C). 'Illini Gold' was chosen as the tolerant cultivar and 'Honey'n'Pearl' as the sensitive cultivar. Seeds ...