A5089212630- Genetic diversity and population structure
- Fish Ecology and Management Studies
- Genetic and phenotypic traits in livestock
- Animal Behavior and Reproduction
- Genomics and Phylogenetic Studies
- Genetic Mapping and Diversity in Plants and Animals
- Chromosomal and Genetic Variations
- Fish Biology and Ecology Studies
- Evolution and Genetic Dynamics
- Physiological and biochemical adaptations
- Fish biology, ecology, and behavior
- Plant and animal studies
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Reproductive biology and impacts on aquatic species
- Wildlife Ecology and Conservation
- Primate Behavior and Ecology
- Genetic Associations and Epidemiology
- Forensic and Genetic Research
- Ecology and Vegetation Dynamics Studies
- Invertebrate Immune Response Mechanisms
- Lepidoptera: Biology and Taxonomy
- Food Industry and Aquatic Biology
- Animal Behavior and Welfare Studies
- Genetically Modified Organisms Research
- Isotope Analysis in Ecology
Louisiana State University
2024-2025
Stanford University
2019-2024
Centro de Investigaciones Cientifícas de las Huastecas 'Aguazarca'
2014-2024
Texas A&M University
2014-2021
Howard Hughes Medical Institute
2020
Southeastern Louisiana University
2015
Selection, recombination, and hybrid evolution Hybridization is an important force in evolution. The effects of hybridization across the whole genome are not understood. Using a fine-scale genetic map, Schumer et al. examined local ancestry replicate natural populations swordtail fish. Each parental species contributes different proportions material to genomes their descendants. Genes from “minor” (less well-represented) parent occur regions that subject higher recombination rates where...
The evolution of reproductive barriers is the first step in formation new species and can help us understand diversification life on Earth. These often take form hybrid incompatibilities, which alleles derived from two different no longer interact properly hybrids
Hybridization is increasingly being recognized as a common process in both animal and plant species. Negative epistatic interactions between genes from different parental genomes decrease the fitness of hybrids can limit gene flow However, little known about number genome-wide distribution genetic incompatibilities separating To detect interacting genes, we perform high-resolution genome scan for linkage disequilibrium unlinked genomic regions naturally occurring hybrid populations swordtail...
Mapping vertebrate incompatibility alleles Deleterious gene interactions may underlie the observed hybrid incompatibilities. However, few genes underlying incompatibilities have been identified, and most of these involve species that do not hybridize in natural conditions. Powell et al. used genome sequencing to map likely responsible for reduce fitness naturally occurring swordtail fish. These combinations result malignant melanoma, which is found hybridizing populations but present...
A rapidly increasing body of work is revealing that the genomes distinct species often exhibit hybrid ancestry, presumably due to postspeciation hybridization between closely related species. Despite growing number documented cases, we still know relatively little about how evolve and stabilize following hybridization, what extent functionally relevant. Here, examine case Xiphophorus nezahualcoyotl, a teleost fish whose genome exhibits significant ancestry. We show was ancient unlikely be...
The emergence of new species is driven by the establishment mechanisms that limit gene flow between populations. A major challenge reconciling theoretical and empirical importance assortative mating in speciation with ease which it can fail. Swordtail fish have an evolutionary history hybridization fragile prezygotic isolating mechanisms. Hybridization two swordtail likely arose via pollution-mediated breakdown 1990s. Here we track unusual genetic patterns one hybrid population over past...
Abstract The evolution of reproductive barriers leads to the formation new species. However, recent research has demonstrated that hybridization been pervasive across tree life even in presence strong barriers. Using swordtail fishes (genus Xiphophorus ), an emerging model system, we document overlapping mechanisms act as gene flow between birchmanni and cortezi by combining genomic sequencing from natural hybrid populations, experimental laboratory crosses, behavioural assays, sperm...
Over the past 2 decades, biologists have come to appreciate that hybridization, or genetic exchange between distinct lineages, is remarkably common-not just in particular lineages but taxonomic groups across tree of life. As a result, genomes many modern species harbor regions inherited from related species. This observation has raised fundamental questions about degree which genomic outcomes hybridization are repeatable and natural selection drives such repeatability. However, lack...
Hybridization between species is widespread across the tree of life. As a result, many species, including our own, harbor regions their genome derived from hybridization. Despite recognition that this process widespread, we understand little about how stabilizes following hybridization, and whether mechanisms driving stabilization tend to be shared species. Here, dissect drivers variation in local ancestry replicated hybridization events two pairs swordtail fish: Xiphophorus birchmanni × X ....
Abstract How barriers to gene flow arise between closely related species is one of the oldest questions in evolutionary biology. Classic models biology predict that negative epistatic interactions variants genomes diverged lineages, known as hybrid incompatibilities, will reduce viability or fertility hybrids. The genetic architecture these and paths through which they have profound implications for efficacy incompatibilities species. While been studied using theoretical approaches several...
It has become clear that hybridization between species is much more common than previously recognized. As a result, we now know the genomes of many modern species, including our own, are patchwork regions derived from past events. Increasingly researchers interested in disentangling which genome originated each parental using local ancestry inference methods. Due to diverse effects admixture, this interest shared across disparate fields, human genetics research ecology and evolutionary...
Abstract The evolution of reproductive barriers is the first step in formation new species and can help us understand diversification life on Earth. These often take form “hybrid incompatibilities,” where alleles derived from two different no longer interact properly hybrids. Theory predicts that hybrid incompatibilities may be more likely to arise at rapidly evolving genes involving multiple should common, but there has been sparse empirical data evaluate these predictions. Here, we...
One of the mechanisms that can lead to formation new species occurs through evolution reproductive barriers. However, recent research has demonstrated hybridization been pervasive across tree life even in presence strong Swordtail fishes (genus
Abstract Across the tree of life, species have repeatedly evolved similar phenotypes. While well-studied for ecological traits, there is also evidence recurrent evolution sexually selected traits. Swordtail fish (Xiphophorus) are a classic model system studying sexual selection, and female Xiphophorus exhibit strong mate preferences large male body size range dimorphic ornaments. Interestingly, traits been lost multiple times in genus. However, has uncertainty over number losses...
Understanding how organisms adapt to changing environments is a core focus of research in evolutionary biology. One common mechanism adaptive introgression, which has received increasing attention as potential route rapid adaptation populations struggling the face ecological change, particularly global climate change. However, hybridization can also result deleterious genetic interactions that may limit benefits introgression. Here, we used combination genome-wide quantitative trait locus...
Over the past two decades, evolutionary biologists have come to appreciate that hybridization, or genetic exchange between distinct lineages, is remarkably common - not just in particular lineages but taxonomic groups across tree of life. As a result, genomes many modern species harbor regions inherited from related species. This observation has raised fundamental questions about degree which genomic outcomes hybridization are repeatable and natural selection drives such repeatability....
Artifice—the manipulation of social and environmental stimuli—is fundamental to research in animal behavior. State-of-the-art techniques have been developed generate present complex visual stimuli. These unique strengths limitations. However, many the issues with synthetic animation virtual reality are common playback experiments general, including those using unmanipulated video or auditory Playback experiments, turn, fall into broader category that artificially manipulate array stimuli...
Natural hybridization events provide unique windows into the barriers that keep species apart as well consequences of their breakdown. Here, we characterize hybrid populations formed between northern swordtail fish Xiphophorus cortezi and birchmanni from collection sites on two rivers. We use simulations new genetic reference panels to develop sensitive accurate local ancestry calling in this novel system. Strikingly, find both rivers consist genetically distinct subpopulations: a cluster...
Abstract Alfred Russel Wallace proposed classifying Amazon rivers based on their colour and clarity: white, black clear water. also that waters could mediate diversification yield distinct fish species. Here, we bring evidence of speciation mediated by water type in the sailfin tetra ( Crenuchus spilurus ), a whose range encompasses very hydrochemical conditions. Distribution two main lineages concords with Wallace's types: one restricted to acidic nutrient‐poor Negro River (herein Rio...
Abstract While hybridization between species is increasingly appreciated to be a common occurrence, little known about the forces that govern subsequent evolution of hybrid genomes. We considered this question in three independent, naturally-occurring populations formed swordtail fish Xiphophorus birchmanni and X. malinche. To end, we built fine-scale genetic map inferred patterns local ancestry along genomes 690 individuals sampled from populations. In all cases, found more regions high...
Abstract Across the tree of life, species have repeatedly evolved similar phenotypes. While well-studied for ecological traits, there is also evidence convergent evolution sexually selected traits. Swordtail fish ( Xiphophorus ) are a classic model system studying sexual selection, and female exhibit strong mate preferences large male body size range dimorphic ornaments. However, traits been lost multiple times in genus. Phylogenetic relationships between this group historically...