| songbird abundance and parasitism differ between urban and rural shrublands. | many studies have examined differences in avian community composition between urban and rural habitats, but few, if any, have looked at nesting success of urban shrubland birds in a replicated fashion while controlling for habitat. we tested factors affecting nest survival, parasitism by the brown-headed cowbird (molothrus ater), and species abundance in shrubland habitat in rural and urban landscapes. we found no support for our hypothesis that nest survival was lower in urban landscapes, but s ... | 2006 | 16705988 |
| complex hybridization dynamics between golden-winged and blue-winged warblers (vermivora chrysoptera and vermivora pinus) revealed by aflp, microsatellite, intron and mtdna markers. | blue-winged (vermivora pinus) and golden-winged warblers (vermivora chrysoptera) have an extensive mosaic hybrid zone in eastern north america. over the past century, the general trajectory has been a rapid replacement of chrysoptera by pinus in a broad, northwardly moving area of contact. previous mtdna-based studies on these species' hybridization dynamics have yielded variable results: asymmetric and rapid introgression from pinus into chrysoptera in some areas and bidirectional maternal gene ... | 2007 | 17498229 |