Ecological determinants of variation in phenotypic selection on quantitative immune defence traits

Phenotypic selection on leaf ecophysiological traits in Helianthus.

Habitats that differ in soil resource availability are expected to differ for selection on resource-related plant traits. Here, we examined spatial and temporal variation in phenotypic selection on leaf ecophysiological traits for 10 Helianthus populations, including two species of hybrid origin, Helianthus anomalus and Helianthus deserticola, and artificial hybrids of their ancestral parents. ...

Phenotypic, Genetic and Epigenetic Variation of Immune Response and Disease Resistance Traits of Pigs

Optimal immune defence in the light of variation in lifespan.

There is good evidence for costs to both the uses of immune defences and their development and maintenance. The optimal defence will be a balance of these costs with the risk of infection and the virulence of the disease. It is therefore clear that the life-history characteristics of both host and parasite will impact the optimal level of defence, and that this may in part explain the variation...

Genetic variation maintained in multilocus models of additive quantitative traits under stabilizing selection.

Stabilizing selection for an intermediate optimum is generally considered to deplete genetic variation in quantitative traits. However, conflicting results from various types of models have been obtained. While classical analyses assuming a large number of independent additive loci with individually small effects indicated that no genetic variation is preserved under stabilizing selection, seve...

Evolution and Selection of Quantitative Traits

7. THE POPULATION GENETICS OF SELECTION 201 Single-locus Selection: Two Alleles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Viability Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Expected time for allele frequency change . . . . . . . . . . . . . . . . . . . . . . ....