A5050629238- Plant and animal studies
- Ecology and Vegetation Dynamics Studies
- Plant Reproductive Biology
- Genetic diversity and population structure
- Plant Parasitism and Resistance
- Evolution and Genetic Dynamics
- Species Distribution and Climate Change
- Insect and Arachnid Ecology and Behavior
- Botany, Ecology, and Taxonomy Studies
- Plant Ecology and Taxonomy Studies
- Rangeland and Wildlife Management
- Environmental DNA in Biodiversity Studies
- Blood groups and transfusion
- Insect and Pesticide Research
- Botanical Research and Chemistry
- Animal Behavior and Reproduction
- Insect Pest Control Strategies
- Archaeology and Natural History
- Allelopathy and phytotoxic interactions
- Isotope Analysis in Ecology
- Bird parasitology and diseases
- Renal Transplantation Outcomes and Treatments
- Marine and coastal plant biology
- Evolution and Paleontology Studies
- Genomics, phytochemicals, and oxidative stress
Washington State University
2015-2025
McGill University
2006-2009
Indiana University Bloomington
2004-2006
University of Chicago
2003
BackgroundThe field of plant mating-system evolution has long been interested in understanding why selfing evolves from outcrossing. Many possible mechanisms drive this evolutionary trend, but most research focused upon the transmission advantage and its ability to provide reproductive assurance when cross-pollination is uncertain. We discuss shared conceptual framework these ideas their empirical support that emerging tests predictions over last 25 years.
Self-compatibility and adaptations to self-fertilization are often found in plant populations at the periphery of species' ranges or on islands. may predominate these environments because it provides reproductive assurance when pollinators availability mates limits seed production. This possibility was studied Leavenworthia alabamica, a flowering endemic southeastern United States. Populations center range retain sporophytic self-incompatibility, but peripheral smaller, self-compatible, have...
Abstract This article documents the addition of 512 microsatellite marker loci and nine pairs Single Nucleotide Polymorphism (SNP) sequencing primers to Molecular Ecology Resources Database. Loci were developed for following species: Alcippe morrisonia , Bashania fangiana, fargesii Chaetodon vagabundus Colletes floralis Coluber constrictor flaviventris Coptotermes gestroi Crotophaga major Cyprinella lutrensis Danaus plexippus Fagus grandifolia Falco tinnunculus Fletcherimyia fletcheri,...
Summary Because establishing a new population often depends critically on finding mates, individuals capable of uniparental reproduction may have colonization advantage. Accordingly, there should be an over‐representation colonizing species in which can reproduce without mate, particularly isolated locales such as oceanic islands. Despite the intuitive appeal this filter hypothesis (known Baker's law), more than six decades analyses yielded mixed findings. We assembled dataset island and...
Abstract Premise In mountain ecosystems, environmental conditions (e.g., temperature, ultraviolet radiation) covary with elevation, potentially limiting gene flow over steep gradients. We hypothesized that, (1) due to stark elevational differences in factors, populations from dissimilar elevations montane versus alpine) are more strongly differentiated than similar elevations; (2) patterns of migration reflect downslope dispersal upslope dispersal; and (3) alpine at the cold edge show...
Colonization at expanding range edges often involves few founders, reducing effective population size. This process can promote the evolution of self-fertilization, but implicating historical processes as drivers trait is difficult and requires an explicit model biogeographic history. In plants, contemporary limits to outcrossing are invoked evolutionary expansions may shape mating system diversity, with leading-edge populations evolving elevated selfing ability. a widespread plant,...
The predominance of outcrossing despite the substantial transmission advantage self‐fertilization remains a paradox. Theory suggests that selection can favor if it enables production offspring are less susceptible to pathogen attack than produced via self‐fertilization. Thus, pressure is contributing maintenance in plants, there may be positive correlation between number species attacking plant and rate species. We tested this hypothesis by examining association fungal large, taxonomically...
Abstract The abundant centre hypothesis ( ACH ) assumes that population abundance, size, density and per‐capita reproductive output should peak at the of a species' geographic range decline towards periphery. Increased isolation among decreased within edge populations reduce within‐population genetic diversity increase differentiation relative to central populations. also predicts asymmetrical gene flow, with net movement migrants from edges. We evaluated these ecological assumptions...
Natural selection should favor the integration of floral traits that enhance pollen export and import in plant populations rely upon pollinators. If this is true, then phenotypic correlations between weaken self‐fertilizing groups do not require pollinator visitation to produce seed. We tested hypothesis Leavenworthia , a genus which there have been multiple independent losses sporophytic self‐incompatibility system found throughout Brassicaceae. In particular, we conducted phylogenetically...
We suggest that supergenes, groups of co-inherited loci, may be involved in a range intriguing genetic and evolutionary phenomena insect societies, play broad roles the evolution cooperation conflict. Supergenes are central an array traits including self-incompatibility, mimicry, sex chromosomes. Recently, researchers identified large supergene, described as social chromosome, which controls organization fire ant. This system was previously considered to remarkable example single gene...
Pollen on a stigma represents local population of male gametophytes vying for access to female in the associated ovary. As most populations, density-independent and density-dependent survival depend intrinsic characteristics environmental (pistil) conditions. These conditions could differ among flowers, plants, species, creating diverse male-gametophyte dynamics, which can influence seed siring production.For nine we characterized relations both mean standard deviation pollen-tube number at...
The reproductive assurance (RA) hypothesis predicts that the ability to autonomously self-fertilize should be favored in environments where a lack of mates or pollinators limits outcross reproduction. Because such outcrossing are predicted most severe at range edges, elevated autonomy peripheral populations is often attributed RA. We test this 24 spanning Campanula americana, including sampling interior and three geographic edges. scored autonomous fruit set pollinator-free environment...
The loss of morphological and physiological mechanisms that prevent self‐fertilization is perhaps the most common evolutionary trend in flowering plants. It generally acknowledged may often be favored by selection at individual level, principally providing reproductive assurance when conditions for vector‐mediated pollination are poor also because mating system modifiers reduce rate outcrossing bias their own transmission. Inbreeding depression accepted as principal factor opposing selfing...
Genetic diversity at the S-locus controlling self-incompatibility (SI) is often high because of negative frequency-dependent selection. In species with highly patchy spatial distributions, genetic drift can overwhelm balancing selection and cause stochastic loss S-alleles. Natural may favor breakdown SI in populations few S-alleles low S-allele constrains seed production self-incompatible plants. We estimated diversity, effective population sizes, migration rates Leavenworthia alabamica, a...
Baker's Law states that selfing should commonly be selected during dispersal because bottlenecks colonization limit the availability of mates. Although this truism has broad intuitive appeal, a recent body theory (Cheptou and Massol 2009; Cheptou 2011) casts doubt on whether adaptation favors both when parameters are free to evolve. In these models, joint evolution rate considered in metapopulation, with spatially temporally variable pollination environment. Under conditions, one two...
In flowering plants, shifts from outcrossing to partial or complete self-fertilization have occurred independently thousands of times, yet the underlying adaptive processes are difficult discern. Selfing's ability provide reproductive assurance when pollination is uncertain an oft-cited ecological explanation for its evolution, but this benefit may be outweighed by costs diminishing selective advantage over outcrossing. We directly studied fitness effects a self-compatibility mutation that...
Character displacement is a potentially important process driving trait evolution and species diversification. Floral traits may experience character in response to pollinator-mediated competition (ecological displacement) or the risk of forming hybrids with reduced fitness (reproductive displacement). We test these alternative hypotheses explain yellow-white petal color polymorphism Leavenworthia stylosa, where yellow morphs are spatially associated white-petaled congener (Leavenworthia...
Although selfing populations harbor little genetic variation limiting evolutionary potential, the causes are unclear. We experimentally evolved large, replicate of Mimulus guttatus for nine generations in greenhouses with or without pollinating bees and studied DNA polymorphism descendants. Populations adapted to produce more selfed seed yet exhibited striking reductions despite large population sizes. Importantly, genome-wide pattern cannot be explained by a simple reduction effective size,...
Abstract Mildly deleterious mutations are thought to play a major role in the extinction of natural populations, especially those that small, isolated, or inbred. Self-fertilization should reduce effective size populations and simultaneously migration between populations. A history self-fertilization therefore cause population harbor substantial local drift load caused by fixation mildly mutations. This hypothesis was tested Leavenworthia alabamica, which contains large, self-incompatible...
Abstract Single-locus sporophytic self-incompatibility inhibits inbreeding in many members of the mustard family (Brassicaceae). To investigate genetics wild Leavenworthia alabamica, diallel crosses were conducted between full siblings. Patterns incompatibility consistent with action single-locus self-incompatibility. DNA sequences related to S-locus receptor kinase (SRK), gene involved self-pollen recognition mustards, cloned and sequenced. A single sequence high identity SRK several other...