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Articles 1 - 8 of 8
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Egg Removal By Brown-Headed Cowbirds: A Field Test Of The Host Incubation Efficiency Hypothesis, Douglas R. Wood, Eric K. Bollinger
Egg Removal By Brown-Headed Cowbirds: A Field Test Of The Host Incubation Efficiency Hypothesis, Douglas R. Wood, Eric K. Bollinger
Eric K. Bollinger
Brown-headed Cowbirds (Molothrus ater) often remove host eggs, usually to the detriment of the host's reproductive success. We tested the hypothesis that host egg size and number influence the incubation efficiency of a parasitic egg. A single House Sparrow (Passer domesticus) or Brown-headed Cowbird egg was placed in each host nest (addition), and in some nests a host egg was removed as well (addition/removal). Hatching success and incubation length were measured to determine whether host-egg removal conferred an advantage in incubation efficiency compared to simple addition of a parasitic egg. Redwinged Blackbirds (Agelaius phoeniceus) and Chipping Sparrows (Spizella passerina) served …
Fraters In Facultate: Models Of Excellence In Fraternity Advising, Charles G. Eberly
Fraters In Facultate: Models Of Excellence In Fraternity Advising, Charles G. Eberly
Charles G. Eberly
This paper is the first of a number I planned to carry out on models of excellent in fraternity chapter advising. I am still working on the qualitative data I collected a decade and a half later. The thesis is that if one focused on models of excellence in fraternity operations to learn the manner in which successful leaders and organizations achieve their objectives, much greater progress would be made than focusing on the reduction of negative issues and problems such as alcohol abuse, sexual abuse, and hazing.
Explanations For The Infrequent Cowbird Parasitism On Common Grackles, Brian D. Peer, Eric K. Bollinger
Explanations For The Infrequent Cowbird Parasitism On Common Grackles, Brian D. Peer, Eric K. Bollinger
Eric K. Bollinger
We determined the factors responsible for the lack of parasitism on Common Grackles (Quiscalus quiscula) by Brown-headed Cowbirds (Molothrus ater). We found no evidence of parasitism on the 401 grackle nests we monitored in east-central Illinois. By the time cowbirds began laying eggs, 88.5% of all grackle nests were beyond the point of successful parasitism. Grackles rejected cowbird eggs more frequently during the prelaying stage of the nesting cycle (38.2%) compared to later stages (12.3%). Thirty-three cowbird eggs and nestlings were cross-fostered into grackle nests. Data were collected on 15 cowbird nestlings, of which three fledged. The cross-fostered cowbird eggs …
Comparative Leaf Anatomy And Systematics In Dendrobium, Sections Aporum And Rhizobium (Orchidaceae), Barbara S. Carlsward, William Lois Stern, Walter S. Judd, Terence W. Lucansky
Comparative Leaf Anatomy And Systematics In Dendrobium, Sections Aporum And Rhizobium (Orchidaceae), Barbara S. Carlsward, William Lois Stern, Walter S. Judd, Terence W. Lucansky
Barbara S. Carlsward
The specialized leaf anatomy for species of Dendrobium within section Aporum is similar to that of species in section Rhizobium. In both sections leaves are characterized by a unifacial or nearly unifacial surface where the exposed surface is abaxial. However, leaves in section Rhizobium also feature a lacuna submerged in the mesophyll and surrounded by an adaxial epidermis. In contrast, leaves in section Aporum merely present an internal suture that divides the leaf into bilateral halves. These two sections of Dendrobium are hypothesized to be sister taxa because of synapomorphies in their foliar anatomy. A cladistic analysis performed with various …
Selective Predation On The Seeds Of Woody Plants, Scott J. Meiners, Edmund W. Stiles
Selective Predation On The Seeds Of Woody Plants, Scott J. Meiners, Edmund W. Stiles
Scott J. Meiners
Selective predation on the seeds of woody plants. J. Torrey Bot. Soc. 124: 67-70). 1997.-Seed predation may be an important factor influencing the structure of successional plant communities. We used a cafeteria-style experiment, placed in an old field and an early successional forest, to determine predator preferences for seeds of nine species of woody plants. Intensity of seed predation was equivalent in both sites. Seed predators preferred Acer saccharum, flex vertic illata, and Viburnum dentatum, but this was not related to seed mass. Predation intensity was more variable in the old field than in the forest, possibly related to the …
Crows Do Not Use Automobiles As Nutcrackers: Putting An Oft-Repeated Anecdote To The Test, Daniel A. Cristol, Paul V. Switzer, K L. Johnson, L S. Walke
Crows Do Not Use Automobiles As Nutcrackers: Putting An Oft-Repeated Anecdote To The Test, Daniel A. Cristol, Paul V. Switzer, K L. Johnson, L S. Walke
Paul V. Switzer
No abstract provided.
"Visions Of Me In The Whitest Raw Light": Assimilation And Doxic Whiteness In Chang-Rae Lee's 'Native Speaker', Tim Engles
Tim Engles
In Chang-rae Lee's first novel, 'Native Speaker,' the protagonist is jolted by the death of his son and the subsequent departure of his wife into intensification of a lifelong identity crisis. The book's guiding metaphor, figured in Henry Park's job as a spy, cleverly elucidates the immigrant's stance as a watchful outsider in American society, but Henry's double life also figures largely in his equally representative struggles to decide for himself what kind of person he is. As a child of immigrant parents, Henry is, in Pierre Bourdieu's useful terms, endowed with a bifurcated "habitus," two sets of culturally induced …
How Effective Are The Things People Say To Apologize? Effects Of The Realization Of The Apology Speech Act., Steven J. Scher, John M. Darley
How Effective Are The Things People Say To Apologize? Effects Of The Realization Of The Apology Speech Act., Steven J. Scher, John M. Darley
Steven J. Scher
The Cross-Cultural Speech Act Realization Project (Blum-Kulka, House, & Kasper, 1989a) has identified five components of an "apology speech act set": five strategies that speakers use to apologize. This study examines the effects of four of those strategies (illocutionary force indicating device, expression of responsibility, promise of forebearance, and offer of repair) on the judgments made by hearers about the speaker and about the apology. Each of the strategies is shown to have an independent effect in improving reactions to the speaker. Further, the magnitude of these effects appear to be roughly similar for each of the strategies. The things …