CORRELATED EVOLUTION OF SEXUAL DIMORPHISM AND MALE DIMORPHISM IN A CLADE OF NEOTROPICAL HARVESTMEN

Autor(es)

Buzatto, Bruno A. ^[1] ; Tomkins, Joseph L. ^[1] ; Simmons, Leigh W. ^[1] ; Machado, Glauco ^[2]

Afiliação do(s) autor(es)

^[1] Univ Western Australia, Sch Anim Biol M092, Ctr Evolutionary Biol, Crawley, WA 6009 - Australia

^[2] Univ Sao Paulo, Inst Biociencias, Dept Ecol, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Evolution; v. 68, n. 6, p. 1671-1686, JUN 2014.
• Citações Web of Science: 20

Resumo

Secondary sexual traits increase male fitness, but may be maladaptive in females, generating intralocus sexual conflict that is ameliorated through sexual dimorphism. Sexual selection on males may also lead some males to avoid expenditure on secondary sexual traits and achieve copulations using alternative reproductive tactics (ARTs). Secondary sexual traits can increase or decrease fitness in males, depending on which ART they employ, generating intralocus tactical conflict that can be ameliorated through male dimorphism. Due to the evolutionary forces acting against intralocus sexual and tactical conflicts, male dimorphism could coevolve with sexual dimorphism, a hypothesis that we tested by investigating these dimorphisms across 48 harvestman species. Using three independently derived phylogenies, we consistently found that the evolution of sexual dimorphism was correlated with that of male dimorphism, and suggest that the major force behind this relationship is the similarity between selection against intralocus sexual conflict and selection against intralocus tactical conflict. We also found that transitions in male dimorphism were more likely in the presence of sexual dimorphism, indicating that if a sexually selected trait arises on an autosome and is expressed in both sexes, its suppression in females probably evolves earlier than its suppression in small males that adopt ARTs. (AU)

• Processo FAPESP: 09/50031-4 - Evolucao do dimorfismo sexual e intrasexual em opilioes da familia gonyleptidae (arachnida: opiliones)
• Beneficiário: Glauco Machado
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/50229-1 - Macro-ecologia da seleção sexual: influencia do clima sobre caracteres sexualmente selecionados em uma ampla escala geográfica
• Beneficiário: Glauco Machado
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/06604-7 - Filogenia dos opiliões da família Gonyleptidae (Arachnida: Opiliones) baseada em caracteres morfológicos, moleculares e comportamentais
• Beneficiário: Ricardo Pinto da Rocha
• Modalidade de apoio: Auxílio à Pesquisa - Regular