Open Access. Powered by Scholars. Published by Universities.®
Ecology and Evolutionary Biology Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Ecology and Evolutionary Biology
Factors Affecting Reproductive Success In Hosts Of The Bronzed Cowbird (Molothrus Aeneus) In The Lower Rio Grande Valley, Texas, Christopher R. Hathcock
Factors Affecting Reproductive Success In Hosts Of The Bronzed Cowbird (Molothrus Aeneus) In The Lower Rio Grande Valley, Texas, Christopher R. Hathcock
Theses and Dissertations - UTB/UTPA
During 1997–99, brood parasitism by the Bronzed Cowbird ( Molothrus aeneus), nest predation, and nest sites were examined in selected songbird species in southern Texas. I found a significantly lower parasitism rate in the Long-billed Thrasher (Toxostoma longirostre ) and Olive Sparrow (Arremonops rufivirgatus) than did Carter (1984) at the same site in the early 1980's. High rates of cowbird visitation to Altamira Oriole (Icterus gularis) nests suggest that cowbirds frequently attempt to parasitize this species. However, orioles probably puncture-eject cowbird eggs from their nests most of the time. Orioles experienced a significantly lower …
Effects Of Leafy Spurge (Euphorbia Esula) Infestation On Breeding Birds Of The Sheyenne National Grassland, Nd, Daniel M. Scheiman
Effects Of Leafy Spurge (Euphorbia Esula) Infestation On Breeding Birds Of The Sheyenne National Grassland, Nd, Daniel M. Scheiman
Masters Theses
Leafy spurge (Euphorbia esula) is an exotic invasive weed in the northern Great Plains. We examined the effects of leafy spurge infestation on densities and nest success of breeding birds in grasslands on the Sheyenne National Grassland (SNG), ND. We categorized spurge-infested grasslands into three levels of infestation, based on the area covered by spurge patches: (a) low (0-20%), (b) medium (20-60%) and, (c) high (> 60%). We surveyed 60 100-m radius circular plots (20 in each category), and searched for nests in three 16-ha plots (one in each category). There were no statistically significant differences in mean species richness …