disruptive selection


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disruptive selection

the selection in favour of phenotypic extremes in a population. Disruptive selection produces divergence between subpopulations. Compare STABILIZING SELECTION.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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Lyon describes disruptive selection as one of three ways evolution shifts a trait.
In spite of the high variance in relative fitness, no significant linear ([beta]') and nonlinear ([gamma]') gradients of selection were detected, indicating an absence of directional and stabilizing/ disruptive selection on spine length (Table 5).
Disruptive selection on habitat preference and the evolution of assortative mating: a simulation study.
On the maintenance of genetic variation by disruptive selection among hosts in a phytophagous mite.
2-6), which could result in either directional or disruptive selection. For all species but Gadwall, variation was the same for scores of unsuccessful and successful nest sites (Table 3), which excludes disruptive selection for these species.
To test our hypotheses on disruptive selection and the mode of inheritance of survival ability, we measured the survival of pure host races and hybrids in an experimental garden.
Disruptive selection and the genetic basis of bill size polymorphism in the African finch Pyrenestes.
Quadratic multiple regression revealed no evidence for stabilizing or disruptive selection. None of the quadratic coefficients approached significance by the least squares method (all P [greater than or equal to] 0.25), and the total [R.sup.2] of the quadratic models was the same or lower than that of the corresponding linear models.
There was some evidence for directional selection for increased stigma exsertion in 1992 and disruptive selection on flower size in 1991, but these were only marginally significant.
In the wild, horned and hornless males utilize different behaviors to encounter and mate with females, and these differences in behavior result in disruptive selection for horns (Emlen 1994b, unpubl.
Uniform stabilizing selection on an additive character generates disruptive selection at the genetic level because various combinations of alleles can yield the same optimal phenotype, but the marginal fitness of any allele depends on the genetic background in which it is found (Wright 1935).