Dense canopy cover over House Wren (Troglodytes aedon) nests increases latency of brood parasitism by Shiny Cowbirds (Molothrus bonariensis)
Obligate brood parasites must find host nests in which to lay their eggs. The search for a suitable host nest is predicted to be more difficult if the host nest is well-concealed by vegetation (nest-concealment hypothesis) and brood parasitism of better concealed nests should be less common than par...
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2012
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01584197_v112_n1_p55_Fiorini http://hdl.handle.net/20.500.12110/paper_01584197_v112_n1_p55_Fiorini |
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paper:paper_01584197_v112_n1_p55_Fiorini2023-06-08T15:13:18Z Dense canopy cover over House Wren (Troglodytes aedon) nests increases latency of brood parasitism by Shiny Cowbirds (Molothrus bonariensis) Fiorini, Vanina Dafne Tuero, Diego Tomas Reboreda, Juan Carlos nest cover nest-concealment hypothesis brood parasitism canopy architecture concealment behavior experimental study host-parasite interaction hypothesis testing incubation mortality nest box obligate behavior passerine reproductive success woodland Molothrus bonariensis Troglodytes Troglodytes aedon Obligate brood parasites must find host nests in which to lay their eggs. The search for a suitable host nest is predicted to be more difficult if the host nest is well-concealed by vegetation (nest-concealment hypothesis) and brood parasitism of better concealed nests should be less common than parasitism of less well-concealed nests. We experimentally tested this hypothesis by placing nest-boxes used by House Wrens (Troglodytes aedon) in woodland sites with sparse and dense canopy cover and measuring the frequency (proportion of nests parasitised), latency (days elapsed since laying of the first host egg and parasitism), and intensity (number of parasite eggs in parasitised nests) of parasitism by Shiny Cowbirds (Molothrus bonariensis). The frequency and intensity of parasitism did not differ between sites with sparse or dense canopy cover, but the latency of parasitism was shorter in sites with sparse cover than in sites with denser cover. Brood parasites that find host nests more quickly have higher reproductive success, whereas House Wrens have higher reproductive success when parasites lay their eggs later during the incubation period, owing to reduced mortality of host nestlings. Because woodland degradation is associated with sparser canopy cover, host species nesting in degraded woodlands may suffer more from parasitism than those nesting in protected woodlands. © 2012 Royal Australasian Ornithologists Union. Fil:Fiorini, V.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tuero, D.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Reboreda, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01584197_v112_n1_p55_Fiorini http://hdl.handle.net/20.500.12110/paper_01584197_v112_n1_p55_Fiorini |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
nest cover nest-concealment hypothesis brood parasitism canopy architecture concealment behavior experimental study host-parasite interaction hypothesis testing incubation mortality nest box obligate behavior passerine reproductive success woodland Molothrus bonariensis Troglodytes Troglodytes aedon |
| spellingShingle |
nest cover nest-concealment hypothesis brood parasitism canopy architecture concealment behavior experimental study host-parasite interaction hypothesis testing incubation mortality nest box obligate behavior passerine reproductive success woodland Molothrus bonariensis Troglodytes Troglodytes aedon Fiorini, Vanina Dafne Tuero, Diego Tomas Reboreda, Juan Carlos Dense canopy cover over House Wren (Troglodytes aedon) nests increases latency of brood parasitism by Shiny Cowbirds (Molothrus bonariensis) |
| topic_facet |
nest cover nest-concealment hypothesis brood parasitism canopy architecture concealment behavior experimental study host-parasite interaction hypothesis testing incubation mortality nest box obligate behavior passerine reproductive success woodland Molothrus bonariensis Troglodytes Troglodytes aedon |
| description |
Obligate brood parasites must find host nests in which to lay their eggs. The search for a suitable host nest is predicted to be more difficult if the host nest is well-concealed by vegetation (nest-concealment hypothesis) and brood parasitism of better concealed nests should be less common than parasitism of less well-concealed nests. We experimentally tested this hypothesis by placing nest-boxes used by House Wrens (Troglodytes aedon) in woodland sites with sparse and dense canopy cover and measuring the frequency (proportion of nests parasitised), latency (days elapsed since laying of the first host egg and parasitism), and intensity (number of parasite eggs in parasitised nests) of parasitism by Shiny Cowbirds (Molothrus bonariensis). The frequency and intensity of parasitism did not differ between sites with sparse or dense canopy cover, but the latency of parasitism was shorter in sites with sparse cover than in sites with denser cover. Brood parasites that find host nests more quickly have higher reproductive success, whereas House Wrens have higher reproductive success when parasites lay their eggs later during the incubation period, owing to reduced mortality of host nestlings. Because woodland degradation is associated with sparser canopy cover, host species nesting in degraded woodlands may suffer more from parasitism than those nesting in protected woodlands. © 2012 Royal Australasian Ornithologists Union. |
| author |
Fiorini, Vanina Dafne Tuero, Diego Tomas Reboreda, Juan Carlos |
| author_facet |
Fiorini, Vanina Dafne Tuero, Diego Tomas Reboreda, Juan Carlos |
| author_sort |
Fiorini, Vanina Dafne |
| title |
Dense canopy cover over House Wren (Troglodytes aedon) nests increases latency of brood parasitism by Shiny Cowbirds (Molothrus bonariensis) |
| title_short |
Dense canopy cover over House Wren (Troglodytes aedon) nests increases latency of brood parasitism by Shiny Cowbirds (Molothrus bonariensis) |
| title_full |
Dense canopy cover over House Wren (Troglodytes aedon) nests increases latency of brood parasitism by Shiny Cowbirds (Molothrus bonariensis) |
| title_fullStr |
Dense canopy cover over House Wren (Troglodytes aedon) nests increases latency of brood parasitism by Shiny Cowbirds (Molothrus bonariensis) |
| title_full_unstemmed |
Dense canopy cover over House Wren (Troglodytes aedon) nests increases latency of brood parasitism by Shiny Cowbirds (Molothrus bonariensis) |
| title_sort |
dense canopy cover over house wren (troglodytes aedon) nests increases latency of brood parasitism by shiny cowbirds (molothrus bonariensis) |
| publishDate |
2012 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01584197_v112_n1_p55_Fiorini http://hdl.handle.net/20.500.12110/paper_01584197_v112_n1_p55_Fiorini |
| work_keys_str_mv |
AT fiorinivaninadafne densecanopycoveroverhousewrentroglodytesaedonnestsincreaseslatencyofbroodparasitismbyshinycowbirdsmolothrusbonariensis AT tuerodiegotomas densecanopycoveroverhousewrentroglodytesaedonnestsincreaseslatencyofbroodparasitismbyshinycowbirdsmolothrusbonariensis AT reboredajuancarlos densecanopycoveroverhousewrentroglodytesaedonnestsincreaseslatencyofbroodparasitismbyshinycowbirdsmolothrusbonariensis |
| _version_ |
1768543746464415744 |