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Full-Text Articles in Biology
Habitat Edge And Nest Predation In House Wrens, Daniel Moore '96
Habitat Edge And Nest Predation In House Wrens, Daniel Moore '96
Honors Projects
I studied the effect of habitat edge on nest predation rates ina population of House Wrens (Troglodytes aedon) which bred in nest boxes in central Illinois from 1986-1994. Each nest box was classified according to its distance from the nearest habitat edge, and edges were classified into either abrupt, gradual or riverine edge-types. Nest predation rates varied significantly annually for the the two major nest predator classes, apparent avian and snake, and Raccoon (Procyon lotor). Neither predator class showed significant differences in nest predation rates in relation to distance from the nearest edge. There was no significant effect of edge-type …
Immunolesions Using Site Specific Injections Of 192-Lgg Saporin Into The Basal Forebrain Fail To Affect Radial Arm Maze Performance In The Male Rat, Lesley J. Hickman '96
Immunolesions Using Site Specific Injections Of 192-Lgg Saporin Into The Basal Forebrain Fail To Affect Radial Arm Maze Performance In The Male Rat, Lesley J. Hickman '96
Honors Projects
In this study I investigated the effects of 192-lgG saporin injections into the medial septal area.(MSA) and nucleus basalis magnocel/ularis (NBM) on radial arm maze performance in the male rat. The results of the present study reveal that combined injections of 192-lgG saporin into the basal forebrain failed to disrupt RAM performance when compared to vehicle-injected controls. In addition, intraperitoneal injections using a muscarinic receptor blocker, scopolamine, failed to reveal a compensatory response of the cholinergic basal forebrain that may have explained the lack of behavioral effects of 192IgG saporin. Consequently, the results of this study suggest that a selective …
Estrogen Levels In House Wren (Troglodytes Aedon) Egg Yolks, V. Brook Waggoner '96
Estrogen Levels In House Wren (Troglodytes Aedon) Egg Yolks, V. Brook Waggoner '96
Honors Projects
Estrogen, when present in early embryonic development, regulates sexual differentiation in the avian nestling and adult. In this study, I developed a procedure to extract and quantify levels (by radioimmunoassay) of the estrogen, 17[beta]-estradiol, in house wren (Troglodytes aedon) egg yolk. Levels of 17[beta]-estradiol found in one clutch of eggs increased with the order of laying, indicating female house wrens may be capable of regulating the levels of 17[beta]-estradiol received by the offspring. Since the attraction of mates is often aided by the display of sex differences, maternal control of 17[beta]-estradiol levels in the embryo may influence the future reproductive …
Radioimmunoassay Analysis Of Testosterone Levels In Clutches Of House Wrens (Troglodytes Aedon) Egg Yolks, Kimberly A. Fryzel '96
Radioimmunoassay Analysis Of Testosterone Levels In Clutches Of House Wrens (Troglodytes Aedon) Egg Yolks, Kimberly A. Fryzel '96
Honors Projects
Recent evidence indicates that variation in intensity of aggressiveness and competitive ability among nestlings of a clutch may be attributed, at least partly, to differences in maternally deposited yolk testosterone that affects embryonic development (Schwabl 1993). We developed a radioimmunoassay (RIA) for measuring yolk testosterone levels in house wren (Troglodytes aedon) eggs. This procedure was used in initial studies to determine whether yolk testosterone varies within a clutch of house wren eggs. The analysis revealed the presence of higher levels of testosterone in yolks of eggs laid later in the clutch sequence. Because later laid eggs tend to hatch later …