Aug 26, 2006

Ecological and reproductive character displacement on an environmental gradient

Evolution; International Journal of Organic Evolution
Emma E Goldberg, Russell Lande

Abstract

Character displacement, in which coevolution of similar species alters their phenotypes, can be difficult to identify on the basis of observational data alone. In two-species systems, the most commonly identified (i.e., classic) resulting pattern is greater phenotypic difference between species in sympatry than allopatry. We show that restricting studies to this pattern may exclude many instances of character displacement, particularly in the presence of spatial environmental gradients. We present four spatial models of character displacement in quantitative traits affecting competition and hybridization between the species. Our models highlight the connections between range limits and character displacement in continuous space. We conclude that the classic pattern is less likely to occur for a trait affecting resource acquisition than for a trait affecting mate choice. We also show that interspecific hybridization (when hybrids are inviable), even in very small amounts, has marked effects on the shape and stability of borders between species and the nature of character displacement. A survey of the empirical literature shows that character displacement studies often lack analysis of spatial phenotype and abundance data. We rec...Continue Reading

  • References30
  • Citations39
  • References30
  • Citations39

Citations

Mentioned in this Paper

Embryo
Wandering Spleen
Polygenic Inheritance
Nucleic Acid Hybridization Procedure
Reproduction
Hybridization, Intraspecies
Sexual Behavior, Animal
Hybrids
Observation - Diagnostic Procedure
Reproductive Fitness

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