A new way to integrate selection when both demography and selection gradients vary over time.

ABSTRACT: When both selection and demography vary over time, how can the long-run expected strength of selection on quantitative traits be measured? There are two basic steps in the proposed new analysis: one relates trait values to fitness components and the other relates fitness components to total fitness. We used one population projection matrix for each state of the environment together with a model of environmental dynamics, defining total fitness as the stochastic growth rate. We multiplied environment-specific, stage-specific mean-standardized selection gradients by environment-specific, stage-specific elasticities of the stochastic growth rate, summing over all relevant life history and environmental paths. Our two example traits were floral tube length in a rainforest herb and the timing o

SUBMITTER: Horvitz CC 

PROVIDER: S-EPMC4115803 | biostudies-literature | 2010 Nov

REPOSITORIES: biostudies-literature