Mixed evidence for the erosion of inter-tactical genetic correlations through intralocus tactical conflict

Alternative reproductive tactics, whereby members of the same sex use different tactics to secure matings are often associated with conditional intrasexual dimorphisms. Given the different selective pressures on males adopting each mating tactic,, intrasexual dimorphism is more likely to arise if phenotypes are genetically uncoupled and free to evolve towards their phenotypic optima. However, in this context, genetic correlations between male morphs could result in intralocus tactical conflict. We investigated the genetic architecture of male dimorphism in bulb mites (Rhizoglyphus echinopus) and earwigs (Forficula auricularia). We used half-sibling breeding designs to assess the heritability and intra/intersexual genetic correlations of dimorphic and monomorphic traits in each species. We found two contrasting patterns; F. auricularia exhibited low intrasexual genetic correlations for the dimorphic trait, suggesting that the intralocus tactical conflict is moving towards a resolution. M...

替代性生殖策略（alternative reproductive tactics），即同性个体通过不同策略获取交配机会，通常与条件性种内二态性（conditional intrasexual dimorphisms）相关联。鉴于采用不同交配策略的雄性面临各异的选择压力，若表型在遗传上相互独立、可自由进化至各自的表型最适值，则更易出现种内二态性。然而在此情境下，雄性形态间的遗传相关性可能引发基因座内策略冲突（intralocus tactical conflict）。本研究针对根螨（Rhizoglyphus echinopus）与蠼螋（Forficula auricularia）的雄性二态性遗传架构展开探究。我们采用半同胞育种设计（half-sibling breeding designs），评估了两个物种中二态与单态性状的遗传力以及性内/性间遗传相关性。本研究发现两种截然不同的模式；蠼螋（F. auricularia）的二态性状在性内遗传相关性较低，这表明其基因座内策略冲突正逐步得到解决。M...