| Full text | |
| Author(s): |
Total Authors: 4
|
| Affiliation: | [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
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Evolution; v. 68, n. 6, p. 1671-1686, JUN 2014. |
| Web of Science Citations: | 20 |
| Abstract | |
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) | |
| FAPESP's process: | 12/50229-1 - Macroecology of sexual selection: large-scale influence of climate on sexually selected traits |
| Grantee: | Glauco Machado |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 08/06604-7 - Cladistics of the harvestmen of the family Gonyleptidae (Arachnida: Opiliones) based on morphological, behavioral and molecular characters |
| Grantee: | Ricardo Pinto da Rocha |
| Support Opportunities: | Regular Research Grants |