Assortative Mating and Natural Selection in an Iris Hybrid Zone

Evolution ◽  
1994 ◽  
Vol 48 (6) ◽  
pp. 1946 ◽  
Author(s):  
Mitchell B. Cruzan ◽  
Michael L. Arnold
Keyword(s):  
Natural Selection ◽  
Assortative Mating ◽  
Hybrid Zone

Natural Selection on Quantitative Traits in the Bombina Hybrid Zone

Evolution ◽  
1995 ◽  
Vol 49 (6) ◽  
pp. 1224 ◽  
Author(s):  
Beate Nurnberger ◽  
Nick Barton ◽  
Catriona MacCallum ◽  
Jason Gilchrist ◽  
Michael Appleby
Keyword(s):  
Natural Selection ◽  
Hybrid Zone ◽  
Quantitative Traits

Radical Epistasis and the Genotype-Phenotype Relationship

1994 ◽  
Vol 2 (1) ◽  
pp. 117-128 ◽  
Author(s):  
David Sloan Wilson ◽  
Alexandra Wells
Keyword(s):  
Linkage Disequilibrium ◽  
Natural Selection ◽  
Assortative Mating ◽  
Evolutionary Process ◽  
Genetic System ◽  
Adaptive Landscape ◽  
Nk Model ◽  
Phenotypic Distribution ◽  
Adaptive Landscapes

Models of evolution often assume that the offspring of two genotypes, which are genetically intermediate by definition, are also phenotypically intermediate. The continuity between genotype and phenotype interferes with the process of evolution on multipeaked adaptive landscapes because the progeny of genotypes that lie on separate adaptive peaks fall into valleys of low fitness. This problem can be solved by epistasis, which disrupts the continuity between genotype and phenotype. In a five-locus sexual haploid model with maximum epistasis, natural selection in multipeak landscapes evolves a set of genotypes that a) occupy the adaptive peaks and b) give rise to each other by recombination. The epistatic genetic system therefore “molds” the phenotypic distribution to the adaptive landscape, without assortative mating or linkage disequilibrium. If the adaptive landscape is changed, a new set of genotypes quickly evolves that satisfies conditions a and b, above, for the new peaks. Our model may be relevant to a number of recalcitrant problems in biology and also stands in contrast to Kauffman's [3] NK model of evolution on rugged fitness surfaces, in which epistasis and recombination tend to constrain the evolutionary process.

scholarly journals Assortative flocking in crossbills and implications for ecological speciation

2012 ◽  
Vol 279 (1745) ◽  
pp. 4223-4229 ◽  
Author(s):  
Julie W. Smith ◽  
Stephanie M. Sjoberg ◽  
Matthew C. Mueller ◽  
Craig W. Benkman
Keyword(s):  
Natural Selection ◽  
Reproductive Isolation ◽  
Assortative Mating ◽  
Ecological Speciation ◽  
Central Question ◽  
Loxia Curvirostra ◽  
Call Type ◽  
Divergent Natural Selection ◽  
Contact Calls ◽  
Red Crossbills

How reproductive isolation is related to divergent natural selection is a central question in speciation. Here, we focus on several ecologically specialized taxa or ‘call types’ of red crossbills ( Loxia curvirostra complex), one of the few groups of birds providing much evidence for ecological speciation. Call types differ in bill sizes and feeding capabilities, and also differ in vocalizations, such that contact calls provide information on crossbill phenotype. We found that two call types of red crossbills were more likely to approach playbacks of their own call type than those of heterotypics, and that their propensity to approach heterotypics decreased with increasing divergence in bill size. Although call similarity also decreased with increasing divergence in bill size, comparisons of responses to familiar versus unfamiliar call types indicate that the decrease in the propensity to approach heterotypics with increasing divergence in bill size was a learned response, and not a by-product of calls diverging pleiotropically as bill size diverged. Because crossbills choose mates while in flocks, assortative flocking could lead indirectly to assortative mating as a by-product. These patterns of association therefore provide a mechanism by which increasing divergent selection can lead to increasing reproductive isolation.

scholarly journals NATURAL SELECTION ON QUANTITATIVE TRAITS IN THE BOMBINA HYBRID ZONE

Evolution ◽  
1995 ◽  
Vol 49 (6) ◽  
pp. 1224-1238 ◽  
Author(s):  
Beate Nürnberger ◽  
Nick Barton ◽  
Catriona MacCallum ◽  
Jason Gilchrist ◽  
Michael Appleby
Keyword(s):  
Natural Selection ◽  
Hybrid Zone ◽  
Quantitative Traits

Strong Natural Selection in a Warning-Color Hybrid Zone

Evolution ◽  
1989 ◽  
Vol 43 (2) ◽  
pp. 421 ◽  
Author(s):  
James Mallet ◽  
Nicholas H. Barton
Keyword(s):  
Natural Selection ◽  
Hybrid Zone
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