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Abstract:

The theory of evolution by sexual selection for sexual size dimorphism (SSD) postulates that SSD primarily reflects the adaptation of males and females to their different reproductive roles. For example, competition among males for access to females increases male body size because larger males are better able to maintain dominant status than smaller males. Larger dominant males sire most offspring while smaller subordinate males are unsuccessful, leading to skew in reproductive success. Therefore, species with male-biased SSD are predicted to have greater variance in male reproductive success than those in which both sexes are similar in size. We tested this prediction among the Pinnipedia, a mammalian group with a great variation in SSD. From a literature review, we identified genetic estimates of male reproductive success for 10 pinniped taxa (eight unique species and two subspecies of a ninth species) that range from seals with similarly sized males and females to species in which males are more than four times as large as females. We found no support for a positive relationship between variance in reproductive success and SSD among pinnipeds after excluding the elephant seals Mirounga leonina and Mirounga angustirostris, which we discuss as distinctive cases. Several explanations for these results are presented, including the revival of one of Darwin's original ideas. Darwin proposed that natural selection may explain SSD based on differences in energetic requirements between sexes and the potential for sexual niche segregation. Males may develop larger bodies to exploit resources that remain unavailable to females due to the energetic constraints imposed on female mammals by gestation and lactation. The importance of this alternative explanation remains to be tested. © 2013 The Mammal Society and John Wiley & Sons Ltd.

Registro:

Documento: Artículo
Título:Variance in male reproductive success and sexual size dimorphism in pinnipeds: Testing an assumption of sexual selection theory
Autor:González-Suárez, M.; Cassini, M.H.
Filiación:Department of Conservation Biology, Estación Biológica de Doñana CSIC, Calle Américo Vespucio s/n, Sevilla, 41092, Spain
Behavioural Biology Lab, IBYME-CONICET, Obligado 2490, Buenos Aires, 1428, Argentina
Group of Studies in Ecology of Mammals, DCB, Universidad de Luján, Rutas 5 y 7, Buenos Aires, 6700, Argentina
Palabras clave:Bioenergetics; Genetic paternity; Habitat differentiation; Marine mammals; Mating behaviour; bioenergetics; body size; competition (ecology); evolutionary theory; habitat use; literature review; mating behavior; niche; pinniped; reproductive success; sexual dimorphism; sexual selection; taxonomy; Mammalia; Mirounga; Mirounga angustirostris; Mirounga leonina; Pinnipedia
Año:2014
Volumen:44
Número:2
Página de inicio:88
Página de fin:93
DOI: http://dx.doi.org/10.1111/mam.12012
Título revista:Mammal Review
Título revista abreviado:Mammal Rev.
ISSN:03051838
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03051838_v44_n2_p88_GonzalezSuarez

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Citas:

---------- APA ----------
González-Suárez, M. & Cassini, M.H. (2014) . Variance in male reproductive success and sexual size dimorphism in pinnipeds: Testing an assumption of sexual selection theory. Mammal Review, 44(2), 88-93.
http://dx.doi.org/10.1111/mam.12012
---------- CHICAGO ----------
González-Suárez, M., Cassini, M.H. "Variance in male reproductive success and sexual size dimorphism in pinnipeds: Testing an assumption of sexual selection theory" . Mammal Review 44, no. 2 (2014) : 88-93.
http://dx.doi.org/10.1111/mam.12012
---------- MLA ----------
González-Suárez, M., Cassini, M.H. "Variance in male reproductive success and sexual size dimorphism in pinnipeds: Testing an assumption of sexual selection theory" . Mammal Review, vol. 44, no. 2, 2014, pp. 88-93.
http://dx.doi.org/10.1111/mam.12012
---------- VANCOUVER ----------
González-Suárez, M., Cassini, M.H. Variance in male reproductive success and sexual size dimorphism in pinnipeds: Testing an assumption of sexual selection theory. Mammal Rev. 2014;44(2):88-93.
http://dx.doi.org/10.1111/mam.12012