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Abstract:

For many hosts of brood-parasitic birds, their frontline of defence is to mob adult parasites that approach the nest. Mobbing is commonly interpreted as an adaptation to prevent the parasite from laying, although to date evidence of this is indirect or anecdotal. We investigated the effectiveness of mobbing by chalk-browed mockingbirds, Mimus saturninus, as a defence against their parasite, the shiny cowbird, Molothrus bonariensis, using videos of 480 naturally occurring cowbird nest visits and other direct observations. Mockingbirds only occasionally prevented cowbirds from reaching the nest or from laying once in it. More often, cowbirds were able to deposit an egg, aided by their agile flight, rapid laying, endurance of mobbing and, in some cases, opportunistic timing, whereby they approached nests when mockingbirds were distracted in battle with other cowbirds. Adult parasites present a second threat to hosts, however, in that they try to damage or remove host eggs prior to laying their own. We found that mobbing at the nest significantly reduced the likelihood that cowbirds broke a mockingbird egg during their visit, despite almost all mobbed visits concluding with a cowbird laying an egg. In this host therefore, the benefit of mobbing must be assessed by two independent measures: prevention of egg laying by the parasite and loss of their own eggs. As mockingbird eggs that survive a cowbird's visit intact can go on to fledge from parasitized broods, we expect strong selection for mobbing as an antiparasite defence in this host, even though it largely fails to prevent parasitism itself. © 2013 The Association for the Study of Animal Behaviour.

Registro:

Documento: Artículo
Título:The wages of violence: Mobbing by mockingbirds as a frontline defence against brood-parasitic cowbirds
Autor:Gloag, R.; Fiorini, V.D.; Reboreda, J.C.; Kacelnik, A.
Filiación:Department of Zoology, University of Oxford, Oxford, United Kingdom
Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Brood parasitism; Chalk-browed mockingbird; Egg puncture; Frontline defence; Host-parasite coevolution; Mimus saturninus; Molothrus bonariensis; Nest defence; Shiny cowbird; antiparasite defense; coevolution; hemoparasite; mobbing; natural selection; nest guarding; passerine; Aves; Mimus saturninus; Molothrus; Molothrus bonariensis
Año:2013
Volumen:86
Número:5
Página de inicio:1023
Página de fin:1029
DOI: http://dx.doi.org/10.1016/j.anbehav.2013.09.007
Título revista:Animal Behaviour
Título revista abreviado:Anim. Behav.
ISSN:00033472
CODEN:ANBEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00033472_v86_n5_p1023_Gloag

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Citas:

---------- APA ----------
Gloag, R., Fiorini, V.D., Reboreda, J.C. & Kacelnik, A. (2013) . The wages of violence: Mobbing by mockingbirds as a frontline defence against brood-parasitic cowbirds. Animal Behaviour, 86(5), 1023-1029.
http://dx.doi.org/10.1016/j.anbehav.2013.09.007
---------- CHICAGO ----------
Gloag, R., Fiorini, V.D., Reboreda, J.C., Kacelnik, A. "The wages of violence: Mobbing by mockingbirds as a frontline defence against brood-parasitic cowbirds" . Animal Behaviour 86, no. 5 (2013) : 1023-1029.
http://dx.doi.org/10.1016/j.anbehav.2013.09.007
---------- MLA ----------
Gloag, R., Fiorini, V.D., Reboreda, J.C., Kacelnik, A. "The wages of violence: Mobbing by mockingbirds as a frontline defence against brood-parasitic cowbirds" . Animal Behaviour, vol. 86, no. 5, 2013, pp. 1023-1029.
http://dx.doi.org/10.1016/j.anbehav.2013.09.007
---------- VANCOUVER ----------
Gloag, R., Fiorini, V.D., Reboreda, J.C., Kacelnik, A. The wages of violence: Mobbing by mockingbirds as a frontline defence against brood-parasitic cowbirds. Anim. Behav. 2013;86(5):1023-1029.
http://dx.doi.org/10.1016/j.anbehav.2013.09.007