Declining Brown-Headed Cowbird (Molothrus ater) Populations Are Associated with Landscape-Specific Reductions in Brood Parasitism and Increases in Songbird Productivity
- Publication Date
- October 15, 2012
- Journal
- PLOS ONE
- Authors
- W. Andrew Cox, Frank R. Thompson Iii, Brian Root & John Faaborg
- Volume
- 7
- Issue
- 10
- Pages
- e47591
- DOI
- https://dx.plos.org/10.1371/journal.pone.0047591
- Publisher URL
- http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0047591
- PubMed
- http://www.ncbi.nlm.nih.gov/pubmed/23077647
- PubMed Central
- http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3471865
- Europe PMC
- http://europepmc.org/abstract/MED/23077647
- Web of Science
- 000309995100142
- Scopus
- 84867513475
- Mendeley
- http://www.mendeley.com/research/declining-brownheaded-cowbird-molothrus-ater-populations-associated-landscapespecific-reductions-bro
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Mendeley | Further Information
{"title"=>"Declining Brown-Headed Cowbird (Molothrus ater) Populations Are Associated with Landscape-Specific Reductions in Brood Parasitism and Increases in Songbird Productivity", "type"=>"journal", "authors"=>[{"first_name"=>"W. Andrew", "last_name"=>"Cox", "scopus_author_id"=>"15838787900"}, {"first_name"=>"Frank R.", "last_name"=>"Thompson", "scopus_author_id"=>"7202217448"}, {"first_name"=>"Brian", "last_name"=>"Root", "scopus_author_id"=>"7003508085"}, {"first_name"=>"John", "last_name"=>"Faaborg", "scopus_author_id"=>"7003400437"}], "year"=>2012, "source"=>"PLoS ONE", "identifiers"=>{"scopus"=>"2-s2.0-84867513475", "sgr"=>"84867513475", "issn"=>"19326203", "pmid"=>"23077647", "doi"=>"10.1371/journal.pone.0047591", "pui"=>"365864512"}, "id"=>"8b7ade50-976d-30b1-ab09-a71d6f6e5d80", "abstract"=>"Many songbird species have experienced significant population declines, partly because of brood parasitism by the Brown-headed Cowbird (Molothrus ater), which is positively associated with increasing landscape forest cover in the midwestern United States. However, cowbirds are also experiencing long-term population declines, which should reduce parasitism pressure and thus increase productivity of host species. We used 20 years of nest monitoring data from five sites in Missouri across a gradient of landscape forest cover to assess temporal trends in the rate and intensity of brood parasitism for Acadian Flycatchers (Empidonax virescens), Indigo Buntings (Passerina cyanea), and Northern Cardinals (Cardinalis cardinalis). We evaluated whether there were concomitant changes in fledging brood size, nest survival, a combination of the two metrics (i.e., host young produced per nest attempt), and whether such changes were more substantial with decreasing landscape forest cover. Parasitism rates and intensities declined substantially during 1991-2010. Fledging brood size and nest survival rates were positively associated with landscape forest cover, confirming the fragmentation hypothesis for Midwest forest birds. Declining parasitism rates were associated with increased fledging brood sizes, with more pronounced increases as landscape forest cover decreased. Nest survival increased insubstantially across time during laying and incubation, but not during the nestling stage. The best predictor of nest survival was parasitism status, with parasitized nests surviving at lower rates than unparasitized nests. Overall, productivity increased during 1991-2010, with more pronounced increases associated with lower levels of landscape forest cover. The negative effects of cowbirds on nest survival in addition to fledging brood size in less forested landscapes suggest that cowbirds may be a primary cause of forest fragmentation effects on songbird productivity in the Midwest. Our results underscore the dynamic nature of demographic parameters, which should be accounted for in predictive models of wildlife responses to future environmental conditions.", "link"=>"http://www.mendeley.com/research/declining-brownheaded-cowbird-molothrus-ater-populations-associated-landscapespecific-reductions-bro", "reader_count"=>29, "reader_count_by_academic_status"=>{"Professor > Associate Professor"=>3, "Researcher"=>6, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>6, "Student > Master"=>8, "Student > Bachelor"=>4, "Professor"=>1}, "reader_count_by_user_role"=>{"Professor > Associate Professor"=>3, "Researcher"=>6, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>6, "Student > Master"=>8, "Student > Bachelor"=>4, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>1, "Environmental Science"=>5, "Agricultural and Biological Sciences"=>18, "Medicine and Dentistry"=>1, "Business, Management and Accounting"=>1, "Psychology"=>1, "Earth and Planetary Sciences"=>2}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Psychology"=>{"Psychology"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>18}, "Business, Management and Accounting"=>{"Business, Management and Accounting"=>1}, "Unspecified"=>{"Unspecified"=>1}, "Environmental Science"=>{"Environmental Science"=>5}}, "reader_count_by_country"=>{"Canada"=>1, "United States"=>3, "Brazil"=>1, "Mexico"=>1, "France"=>1}, "group_count"=>0}Scopus | Further Information
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- {"id"=>"257955705666023424", "text"=>"cool new #OA #PLOS paper: as the landscape changes, cowbirds do a bad job at parasitizing nests and songbirds flourish: http://t.co/pxMuG5EQ", "created_at"=>"2012-10-15T21:26:47Z", "user"=>"hylopsar", "user_name"=>"rafael maia", "user_profile_image"=>"http://a0.twimg.com/profile_images/2199675252/twitvatar_normal.jpg"}
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