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Abstract:

Parasitic cowbirds lay eggs in the nests of other species and dupe them into caring for their young. Unlike other brood parasites, cowbirds have not developed egg mimicry or bizarre chick morphology. However, most of them parasitize a large number of hosts. Several features of cowbirds have been proposed as more general adaptations to brood parasitism. In this study, we used a recent molecular phylogeny as a historical framework to test the possible adaptations of the parasitic cowbird, including egg size, eggshell thickness and energy content of the eggs, length of the incubation period, and growth pattern of cowbird nestlings. We used a recently developed extension of independent contrasts to test whether the five cowbird species deviate from general allometric equations. We generated prediction intervals for a nonparasite that evolved in the place of the cowbirds. By using these prediction intervals, we found that parasitic cowbirds had not reduced weight or energy content of their eggs, nor their incubation period over evolutionary time. Cowbird chicks and those of nonparasitic relatives had similar growth pattern. The only characteristic that separated parasitic cowbirds from their nonparasitic relatives was an increase in eggshell thickness. All these findings were robust and resisted the use of three models of character evolution. The fact that most traits exhibited by cowbirds were inherited from a nonparasitic ancestor does not rule out that they are advantageous for parasitism. Future research should focus on such traits of cowbird relatives and on how these traits preadapted a particular lineage to become parasites.

Registro:

Documento: Artículo
Título:Phylogenetic analysis of life-history adaptations in parasitic cowbirds
Autor:Mermoz, M.E.; Ornelas, J.F.
Filiación:Depto. Ecologia Comportamiento Anim., Instituto de Ecología A.C., Km 2.5 a. carretera Coatepec No 351, Xalapa, Veracruz 91070, Mexico
Lab. de Ecologia y Comportamiento, Depto. de Ecologia, Genet. y Evol., (1428) Ciudad Universitaria, Buenos Aires, Argentina
Palabras clave:Adaptation; Cowbirds; Egg size; Eggshell; Icteridae; Incubation period; Independent contrasts; Nestling development; Phylogeny; adaptation; bird; egg size; eggshell; life history; nest; parasitism; phylogenetics; Aves; Gallus gallus; Icteridae; Molothrus
Año:2004
Volumen:15
Número:1
Página de inicio:109
Página de fin:119
DOI: http://dx.doi.org/10.1093/beheco/arg102
Título revista:Behavioral Ecology
Título revista abreviado:Behav. Ecol.
ISSN:10452249
CODEN:BEECE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10452249_v15_n1_p109_Mermoz

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Citas:

---------- APA ----------
Mermoz, M.E. & Ornelas, J.F. (2004) . Phylogenetic analysis of life-history adaptations in parasitic cowbirds. Behavioral Ecology, 15(1), 109-119.
http://dx.doi.org/10.1093/beheco/arg102
---------- CHICAGO ----------
Mermoz, M.E., Ornelas, J.F. "Phylogenetic analysis of life-history adaptations in parasitic cowbirds" . Behavioral Ecology 15, no. 1 (2004) : 109-119.
http://dx.doi.org/10.1093/beheco/arg102
---------- MLA ----------
Mermoz, M.E., Ornelas, J.F. "Phylogenetic analysis of life-history adaptations in parasitic cowbirds" . Behavioral Ecology, vol. 15, no. 1, 2004, pp. 109-119.
http://dx.doi.org/10.1093/beheco/arg102
---------- VANCOUVER ----------
Mermoz, M.E., Ornelas, J.F. Phylogenetic analysis of life-history adaptations in parasitic cowbirds. Behav. Ecol. 2004;15(1):109-119.
http://dx.doi.org/10.1093/beheco/arg102