An Evaluation of Narrow Hybrid Zones in Vertebrates

@article{Moore1977AnEO,
  title={An Evaluation of Narrow Hybrid Zones in Vertebrates},
  author={William S. Moore},
  journal={The Quarterly Review of Biology},
  year={1977},
  volume={52},
  pages={263 - 277}
}
  • W. Moore
  • Published 1 September 1977
  • Biology
  • The Quarterly Review of Biology
A review of the literature on vertebrate hybridization reveals the existence of a number of narrow hybrid zones. Three hypotheses have been suggested to explain the occurrence of these zones. The ephemeral-zone hypothesis states that hybridization will end either in speciation or fusion of the hybridizing taxa by means of introgression. The dynamic-equilibrium hypothesis allows the possibility that narrow hybrid zones might be stable: where hybrids are confined to a small area by steep… 
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A review of empirical studies of moving hybrid zones in animals and plants shows 23 examples with observational evidence for movement, and a further 16 where patterns of introgression in molecular markers could be interpreted as signatures of movement.
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TLDR
The results indicate that the hybrid zone is characterized by mostly concordant character clines that are narrow relative to dispersal, the absence of a hybrid swarm, and low population density at the center of the zone.
AN EMPIRICAL TEST OF PREDICTIONS OF TWO COMPETING MODELS FOR THE MAINTENANCE AND FATE OF HYBRID ZONES: BOTH MODELS ARE SUPPORTED IN A HARD‐CLAM HYBRID ZONE
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