Can nest predation explain the lack of defenses against Cowbird brood parasitism in the Rufous-collared Sparrow (Zonotrichia capensis)?
Although interspecifc avian brood parasitism usually lowers host productivity, some species lack any defense against parasites. We analyzed the efect of parasite egg removal or nest desertion following a parasitism event on the breeding productivity of the Rufous-collared Sparrow (Zonotrichia capens...
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2013
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v130_n3_p408_Carro http://hdl.handle.net/20.500.12110/paper_00048038_v130_n3_p408_Carro |
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paper:paper_00048038_v130_n3_p408_Carro2023-06-08T14:29:40Z Can nest predation explain the lack of defenses against Cowbird brood parasitism in the Rufous-collared Sparrow (Zonotrichia capensis)? Carro, Mariana Emilia Fernandez, Gustavo Javier Antiparasite defenses Brood parasitism Coevolution Molothrus bonariensis Rufous-collared Sparrow Shiny Cowbird Zonotrichia capensis antiparasite defense brood desertion brood parasitism coevolution egg rejection nest predation nesting success passerine Aves Molothrus bonariensis Passeridae Zonotrichia capensis Although interspecifc avian brood parasitism usually lowers host productivity, some species lack any defense against parasites. We analyzed the efect of parasite egg removal or nest desertion following a parasitism event on the breeding productivity of the Rufous-collared Sparrow (Zonotrichia capensis), a common host of the Shiny Cowbird (Molothrus bonariensis). The Rufouscollared Sparrow is an efective cowbird host that does not eject parasite eggs. We removed cowbird eggs from nests of Rufouscollared Sparrows to test for diferences in hatching, fedging, and nesting success among naturally unparasitized, parasitized, and experimentally unparasitized nests from which we removed the cowbird eggs. We also used simulations to test whether parasite egg removal or nest desertion provide viable strategies to counter the efects of parasitism in this species. Naturally unparasitized nests produced more nestlings and fedglings than parasitized and experimentally unparasitized nests, but there were no diferences between parasitized nests and those from which cowbird eggs were removed. Moreover, the overall nesting success was similar for all nest types. Simulation models confrmed these results but also showed that productivity may still increase through parasite egg ejection when the nest predation rate is relaxed only if no cost of parasite egg ejection is assumed. By contrast, nest desertion was not a viable strategy to reduce the efect of parasitism. We suggest that high nest predation could reduce the benefts of antiparasite defenses in the Rufouscollared Sparrow and may help explain the lack of such behavior in this species. © 2013 by The American Ornithologists' Union. Fil:Carro, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Fernández, G.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v130_n3_p408_Carro http://hdl.handle.net/20.500.12110/paper_00048038_v130_n3_p408_Carro |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Antiparasite defenses Brood parasitism Coevolution Molothrus bonariensis Rufous-collared Sparrow Shiny Cowbird Zonotrichia capensis antiparasite defense brood desertion brood parasitism coevolution egg rejection nest predation nesting success passerine Aves Molothrus bonariensis Passeridae Zonotrichia capensis |
| spellingShingle |
Antiparasite defenses Brood parasitism Coevolution Molothrus bonariensis Rufous-collared Sparrow Shiny Cowbird Zonotrichia capensis antiparasite defense brood desertion brood parasitism coevolution egg rejection nest predation nesting success passerine Aves Molothrus bonariensis Passeridae Zonotrichia capensis Carro, Mariana Emilia Fernandez, Gustavo Javier Can nest predation explain the lack of defenses against Cowbird brood parasitism in the Rufous-collared Sparrow (Zonotrichia capensis)? |
| topic_facet |
Antiparasite defenses Brood parasitism Coevolution Molothrus bonariensis Rufous-collared Sparrow Shiny Cowbird Zonotrichia capensis antiparasite defense brood desertion brood parasitism coevolution egg rejection nest predation nesting success passerine Aves Molothrus bonariensis Passeridae Zonotrichia capensis |
| description |
Although interspecifc avian brood parasitism usually lowers host productivity, some species lack any defense against parasites. We analyzed the efect of parasite egg removal or nest desertion following a parasitism event on the breeding productivity of the Rufous-collared Sparrow (Zonotrichia capensis), a common host of the Shiny Cowbird (Molothrus bonariensis). The Rufouscollared Sparrow is an efective cowbird host that does not eject parasite eggs. We removed cowbird eggs from nests of Rufouscollared Sparrows to test for diferences in hatching, fedging, and nesting success among naturally unparasitized, parasitized, and experimentally unparasitized nests from which we removed the cowbird eggs. We also used simulations to test whether parasite egg removal or nest desertion provide viable strategies to counter the efects of parasitism in this species. Naturally unparasitized nests produced more nestlings and fedglings than parasitized and experimentally unparasitized nests, but there were no diferences between parasitized nests and those from which cowbird eggs were removed. Moreover, the overall nesting success was similar for all nest types. Simulation models confrmed these results but also showed that productivity may still increase through parasite egg ejection when the nest predation rate is relaxed only if no cost of parasite egg ejection is assumed. By contrast, nest desertion was not a viable strategy to reduce the efect of parasitism. We suggest that high nest predation could reduce the benefts of antiparasite defenses in the Rufouscollared Sparrow and may help explain the lack of such behavior in this species. © 2013 by The American Ornithologists' Union. |
| author |
Carro, Mariana Emilia Fernandez, Gustavo Javier |
| author_facet |
Carro, Mariana Emilia Fernandez, Gustavo Javier |
| author_sort |
Carro, Mariana Emilia |
| title |
Can nest predation explain the lack of defenses against Cowbird brood parasitism in the Rufous-collared Sparrow (Zonotrichia capensis)? |
| title_short |
Can nest predation explain the lack of defenses against Cowbird brood parasitism in the Rufous-collared Sparrow (Zonotrichia capensis)? |
| title_full |
Can nest predation explain the lack of defenses against Cowbird brood parasitism in the Rufous-collared Sparrow (Zonotrichia capensis)? |
| title_fullStr |
Can nest predation explain the lack of defenses against Cowbird brood parasitism in the Rufous-collared Sparrow (Zonotrichia capensis)? |
| title_full_unstemmed |
Can nest predation explain the lack of defenses against Cowbird brood parasitism in the Rufous-collared Sparrow (Zonotrichia capensis)? |
| title_sort |
can nest predation explain the lack of defenses against cowbird brood parasitism in the rufous-collared sparrow (zonotrichia capensis)? |
| publishDate |
2013 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00048038_v130_n3_p408_Carro http://hdl.handle.net/20.500.12110/paper_00048038_v130_n3_p408_Carro |
| work_keys_str_mv |
AT carromarianaemilia cannestpredationexplainthelackofdefensesagainstcowbirdbroodparasitismintherufouscollaredsparrowzonotrichiacapensis AT fernandezgustavojavier cannestpredationexplainthelackofdefensesagainstcowbirdbroodparasitismintherufouscollaredsparrowzonotrichiacapensis |
| _version_ |
1768546140810117120 |