The origins of sexual dimorphism in body size in ungulates

Pérez-Barbería, F.J., Gordon, I.J., and Pagel, M. (2002) The origins of sexual dimorphism in body size in ungulates. Evolution, 56 (6). pp. 1276-1285.

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Abstract

Jarman (1974) proposed a series of relationships between habitat use, food dispersion, and social behavior and hypothesized a series of evolutionary steps leading to sexual dimorphism in body size through sexual selection in African antelope species. The hypothesis states that sexual size dimorphism evolved in a three-step process. Initially, ancestral monomorphic and monogamous ungulate species occupying closed habitats radiated into open grassland habitats. Polygynous mating systems then rapidly evolved in response to the aggregation of males and females, perhaps in relation to the clumped distribution of food resources in open habitats. Subsequently, size dimorphism evolved ill those species occupying, open habitats, but not in species that remained in closed habitats or retained monogamy. This hypothesis has played all important role in explaining the origins of sexual dimorphism in mammals. However, the temporal sequence of the events that Jarman proposed has never been demonstrated. Here We use it phylogeny of extant ungulate species, along with maximum-likelihood statistical techniques, to provide a test of Jarman's hypothesis.

Item ID: 42582
Item Type: Article (Research - C1)
ISSN: 1558-5646
Keywords: body size, habitat use, phylogeny, polygyny, sex
Funders: Training and Mobility of Researchers Scheme of the European Communities, Scottish Executive Environment and Rural Affairs Department (SEERAD), Leverhulme Trust, Biotechnology and Biological Sciences Research Council (BBSRC), Natural Environment Research Council (UK) (NERC)
Date Deposited: 10 Feb 2016 07:43
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 60%
06 BIOLOGICAL SCIENCES > 0608 Zoology > 060806 Animal Physiological Ecology @ 40%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 50%
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