Hybridization, Introgression, and the Nature of Species Boundaries

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ID: 306752
2014
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Abstract
Species can be defined as populations that are diagnosably distinct, reproductively isolated, cohesive, or exclusive groups of organisms. Boundaries between species in sympatry are maintained by intrinsic barriers to gene exchange; these boundaries may not be uniform in space, in time, or across the genome. Here, we explore the nature of the species boundary, defined as the phenotypes/genes/genome regions that remain differentiated in the face of potential hybridization and introgression. We emphasize that species boundaries are semipermeable, with permeability (gene exchange) being a function of genome region. The early evidence for semipermeable species boundaries came from data on differential introgression in hybrid zones. This "genic view" of species was common in the hybrid zone literature even when few molecular markers were available to characterize genome-wide patterns of variation. Now, molecular tools allow detailed characterization of differentiation between diverging lineages and patterns of variation across natural hybrid zones, but the questions being asked by evolutionary biologists have remained much the same. Recent data (from DNA sequences and genotypes) reinforce earlier conclusions about the semipermeable nature of most species boundaries. However, debate persists over the nature and extent of genome divergence that accompanies speciation.
Reference Key
openalex_W2077425680 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors R. G. Harrison, Erica L. Larson
Journal journal of heredity
Year 2014
DOI
10.1093/jhered/esu033
URL
https://doi.org/10.1093/jhered/esu033
Keywords Keywords not found

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