Brown-headed cowbird parasitism of neotropical migratory songbirds in riparian areas along the lower Colorado river

Persistent Link:
http://hdl.handle.net/10150/192094
Title:
Brown-headed cowbird parasitism of neotropical migratory songbirds in riparian areas along the lower Colorado river
Author:
Averill, Annalaura, 1967-
Issue Date:
1996
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Populations of several riparian-obligate, neotropical migratory songbirds have declined in recent years, partly due to brood parasitism by brown-headed cowbirds (Molothrus ater). In 1994 and 1995, 1 measured parasitism rates and nesting success of 4 riparian-obligate, neotropical migrants breeding in the lower Colorado River valley. Because vegetation characteristics of nest sites may influence cowbird parasitism and host nesting success, I also measured vegetation attributes associated with nest-site selection. Parasitism rates were 40-90%, and reproductive success was significantly lower in parasitized nests. Foliage cover may influence host nest-site selection and prevent cowbird nest discovery. The patchy distribution of native tree species may have aided cowbird nest discovery by providing elevated survey perches. Saltcedar (Tamarix ramosissima) was an important understory component providing foliage cover at nests. Understanding vegetation characteristics associated with host and cowbird nest-site selection should be useful in riparian restoration projects and cowbird control.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Birds -- Parasitism.; Songbirds -- Migration.; Brown-headed cowbird.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Renewable Natural Resources; Graduate College
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleBrown-headed cowbird parasitism of neotropical migratory songbirds in riparian areas along the lower Colorado riveren_US
dc.creatorAverill, Annalaura, 1967-en_US
dc.contributor.authorAverill, Annalaura, 1967-en_US
dc.date.issued1996en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractPopulations of several riparian-obligate, neotropical migratory songbirds have declined in recent years, partly due to brood parasitism by brown-headed cowbirds (Molothrus ater). In 1994 and 1995, 1 measured parasitism rates and nesting success of 4 riparian-obligate, neotropical migrants breeding in the lower Colorado River valley. Because vegetation characteristics of nest sites may influence cowbird parasitism and host nesting success, I also measured vegetation attributes associated with nest-site selection. Parasitism rates were 40-90%, and reproductive success was significantly lower in parasitized nests. Foliage cover may influence host nest-site selection and prevent cowbird nest discovery. The patchy distribution of native tree species may have aided cowbird nest discovery by providing elevated survey perches. Saltcedar (Tamarix ramosissima) was an important understory component providing foliage cover at nests. Understanding vegetation characteristics associated with host and cowbird nest-site selection should be useful in riparian restoration projects and cowbird control.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshBirds -- Parasitism.en_US
dc.subject.lcshSongbirds -- Migration.en_US
dc.subject.lcshBrown-headed cowbird.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.committeememberMorrison, Michael L.en_US
dc.contributor.committeememberMannan, R. Williamen_US
dc.contributor.committeememberGuertin, D. Philipen_US
dc.identifier.oclc218575297en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.