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Evolutionary dynamics under various modes of reproduction
Chapter 1. Dispersal and migration are spatially limited in many natural populations. Such limitations can lead to clustering of like types, which weakens competition between unlike types; thus, the rate by which a fitter type displaces an inferior competitor can be affected by the spatial scale of movement. We use a birth-death ...
Shape matters: corolla curvature improves nectary discovery in the hawkmoth Manduca sexta
I measured the effects of variation in corolla curvature and nectary aperture radius on pollinator foraging ability using the hawkmoth Manduca sexta and 3D-printed artificial flowers whose shapes were mathematically specified. In dimorphic arrays containing trumpet-shaped flowers and flat-disk flowers, hawkmoths were able ...
Duplication and Functional Divergence in the Floral Organ Identity Genes
Among all extant land plant lineages, the flowering plants, or angiosperms, are by far the most abundant and diverse. A leading force in their speciation has been attributed to morphological changes in flowers, a key reproductive innovation. The floral organ identity genes are thus a logical focus to gain insight into the ...
Evolutionary Dynamics of Pine Squirrels (Tamiasciurus) in Western North America
(2013-07-25)
The evolution of new phenotypes and species is a population genetic process that is governed by four fundamental forces: natural selection, drift, mutation, and gene flow. Ecological genetics is the reciprocal interaction between population genetic theory and empirical observations from nature and the laboratory. Here I present ...
Enhancing Evolution: When Spatial Structure and Environmental Change Improve Adaptation
(2014-02-24)
Evolution by natural selection is the primary creative force in biology. In order for populations to thrive, or even survive, requires a continual generative process. An understand of the process of natural selection, its strengths and weaknesses, is necessary for both predictions about the future course of life, as well as ...