title: Selection is stronger in early-versus-late stages of divergence in a Neotropical livebearing fish.
abstract: How selection acts to drive trait evolution at different stages of divergence is of fundamental importance in our understanding of the origins of biodiversity. Yet, most studies have focused on a single point along an evolutionary trajectory. Here, we provide a case study evaluating the strength of divergent selection acting on life-history traits at early-versus-late stages of divergence in Brachyrhaphis fishes. We find that the difference in selection is stronger in the early-diverged population than the late-diverged population, and that trait differences acquired early are maintained over time.
authors.affiliation: Department of Biology, Brigham Young University, Provo, UT 84602, USA sjingley@gmail.com.
authors.forename: Spencer J
authors.identifier: 0000-0002-2414-9892
authors.initials: SJ
authors.lastname: Ingley
authors.affiliation: Department of Biology, Brigham Young University, Provo, UT 84602, USA Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT 84602, USA.
authors.forename: Jerald B
authors.initials: JB
authors.lastname: Johnson
mesh_terms: D000818:Animals; D005075:Biological Evolution; D003532:Cyprinodontiformes / Q000235:genetics / Q000502:physiology*; D005260:Female; D010641:Phenotype; D010802:Phylogeny; D012641:Selection, Genetic
keywords: Brachyrhaphis; Fisher's fundamental theorem; elasticity; mark–recapture; matrix modelling