6 Works

Data from: Development of genetic diversity, differentiation and structure over 500 years in four ponderosa pine populations

Mark R. Lesser, Stephen T. Jackson & Thomas L. Parchman
Population history plays an important role in shaping contemporary levels of genetic variation and geographic structure. This is especially true in small, isolated range-margin populations, where effects of inbreeding, genetic drift and gene flow may be more pronounced than in large continuous populations. Effects of landscape fragmentation and isolation distance may have implications for persistence of range-margin populations if they are demographic sinks. We studied four small, disjunct populations of ponderosa pine over a 500-year...

Data from: Experimental evidence for ecological selection on genome variation in the wild

Zachariah Gompert, Aaron A. Comeault, Timothy E. Farkas, Jeffery L. Feder, Thomas L. Parchman, Alex C. Buerkle, Patrik Nosil & Jeffrey L. Feder
Understanding natural selection's effect on genetic variation is a major goal in biology, but the genome-scale consequences of contemporary selection are not well known. In a release and recapture field experiment we transplanted stick insects to native and novel host plants and directly measured allele frequency changes within a generation at 186 576 genetic loci. We observed substantial, genome-wide allele frequency changes during the experiment, most of which could be attributed to random mortality (genetic...

Data from: The influence sampling design on species tree inference: a new relationship for the New World chickadees (Aves: Poecile)

Rebecca Brown Harris, Matthew D. Carling & Irby J. Lovette
In this study, we explore the long-standing issue of how many loci are needed to infer accurate phylogenetic relationships, and whether loci with particular attributes (i.e., parsimony informativeness, variability, gene tree resolution) outperform others. To do so, we use an empirical dataset consisting of the seven species of chickadees (Aves: Paridae), an analytically tractable, recently diverged group, and well studied ecologically but lacking a nuclear phylogeny. We estimate relationships using 40 nuclear loci and mitochondrial...

Data from: The evolutionary origins of modularity

Jeff Clune, Jean-Baptiste Mouret & Hod Lipson
A central biological question is how natural organisms are so evolvable (capable of quickly adapting to new environments). A key driver of evolvability is the widespread modularity of biological networks--their organization as functional, sparsely connected subunits--but there is no consensus regarding why modularity itself evolved. While most hypotheses assume indirect selection for evolvability, here we demonstrate that the ubiquitous, direct selection pressure to reduce the cost of connections between network nodes causes the emergence of...

Data from: Landscape-scale eco-evolutionary dynamics: selection by seed predators and fire determine a major reproductive strategy

Matt V. Talluto & Craig W. Benkman
Recent work in model systems has demonstrated significant effects of rapid evolutionary change on ecological processes (eco-evolutionary dynamics). Fewer studies have addressed whether eco-evolutionary dynamics structure natural ecosystems. We investigated variation in the frequency of serotiny in lodgepole pine (Pinus contorta), a widespread species in which postfire seedling density and ecosystem structure are largely determined by serotiny. Serotiny, the retention of mature seeds in cones in a canopy seed bank, is thought to be an...

Data from: Behavior and nutritional condition buffer a large-bodied endotherm against direct and indirect effects of climate

Ryan A. Long, R. Terry Bowyer, Warren P. Porter, Paul Mathewson, Kevin Lee Monteith & John G. Kie
Temporal changes in net energy balance of animals strongly influence fitness; consequently, natural selection should favor behaviors that increase net energy balance by buffering individuals against negative effects of environmental variation. The relative importance of behavioral responses to climate-induced variation in costs versus supplies of energy, however, is uncertain, as is the degree to which such responses are mediated by current stores of energy. We evaluated relationships among behavior, nutritional condition (i.e., energetic state), and...

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