10 Works

Data from: Predicting the response to simultaneous selection: genetic architecture and physiological constraints

Goggy Davidowitz, H. Frederik Nijhout & Derek A. Roff
A great deal is known about the evolutionary significance of body size and development time. They are determined by the non-linear interaction of three physiological traits: two hormonal events and growth rate. In this study we investigate how the genetic architecture of the underlying three physiological traits affects the simultaneous response to selection on the two life history traits in the hawk moth Manduca sexta. The genetic architecture suggests that when the two life history...

Data from: A test of the hypothesis that correlational selection generates genetic correlations

Derek A. Roff & Daphne J. Fairbairn
Theory predicts that correlational selection on two traits will cause the major axis of the bivariate G matrix to orient itself in the same direction as the correlational selection gradient. Two testable predictions follow from this: for a given pair of traits (1) the sign of correlational selection gradient should be the same as that of the genetic correlation, and (2) the correlational selection gradient should be positively correlated with the value of the genetic...

Data from: Crossing the uncrossable: novel trans-valley biogeographic patterns revealed in the genetic history of low dispersal mygalomorph spiders (Antrodiaetidae, Antrodiaetus) from California

Marshal Hedin, James Starrett & Cheryl Hayashi
Antrodiaetus riversi is a dispersal-limited, habitat specialized mygalomorph spider species endemic to mesic woodlands of northern and central California. Here we build upon prior phylogeographic research using a much larger geographic sample and include additional nuclear genes, providing more detailed biogeographic insights throughout the range of this complex. Of particular interest is the uncovering of unexpected and replicated trans-valley biogeographic patterns, where in two separate genetic clades western haplotypes in the California south Coast Ranges...

Data from: Life history evolution in guppies VIII: the demographics of density regulation in guppies (Poecilia reticulata)

David N. Reznick, Ronald D. Bassar, Joseph Travis & F. Helen Rodd
In prior research, we found the way guppy life histories evolve in response to living in environments with a high or low risk of predation is consistent with life history theory that assumes no density-dependence. We later found that guppies from high predation environments experience higher mortality rates than those from low predation environments, but the increased risk was evenly distributed across all age/size classes. Life history theory that assumes density-independent population growth predicts that...

Data from: Genome wide linkage disequilibrium in Chinese asparagus bean (Vigna. unguiculata ssp. sesquipedialis) germplasm: implications for domestication history and genome wide association studies

Pei Xu, Xiaohua Wu, Baogen Wang, Jie Luo, Yonghua Liu, Jeffrey D. Ehlers, Timothy J. Close, Philip A. Roberts, Sha Wang, Zhongfu Lu & Guojing Li
Association mapping of important traits of crop plants relies on first understanding the extent and patterns of linkage disequilibrium (LD) in the particular germplasm being investigated. We characterize here the genetic diversity, population structure and genome wide LD patterns in a set of asparagus bean (Vigna. unguiculata ssp. sesquipedialis) germplasm from China. A diverse collection of 99 asparagus bean and normal cowpea accessions were genotyped with 1127 expressed sequence tag-derived single nucleotide polymorphism markers (SNPs)....

Data from: There is more than one way to skin a G matrix

Derek A. Roff, Markus J. Rantala, Jenni M. Prokkola & Indrikis Krams
Because of its importance in directing evolutionary trajectories there has been considerable interest in comparing variation among genetic variance-covariance ( G) matrices. Numerous statistical approaches have been suggested but no general analysis of the relationship among these methods has previously been published. In this paper we used data from a half-sib experiment and simulations to explore the results of applying eight tests (T method, modified Mantel test, Bartlett’s test, Flury hierarchy, Jackknife-MANOVA, Jackknife-eigenvalue test, random...

Data from: A phylogenetic analysis of the megadiverse Chalcidoidea (Hymenoptera)

John M. Heraty, Roger A. Burks, Astrid Cruaud, Gary A. P. Gibson, Johan Liljeblad, James Munro, Jean-Yves Rasplus, Gerard Delvare, Petr Janšta, Alex Gumovsky, John Huber, James B. Woolley, Lars Krogmann, Steve Heydon, Andrew Polaszek, Stefan Schmidt, D. Chris Darling, Michael W. Gates, Jason Mottern, Elizabeth Murray, Ana Dal Molin, Serguei Triapitsyn, Hannes Baur, John D. Pinto, Simon Van Noort … & Matthew Yoder
Chalcidoidea (Hymenoptera) is extremely diverse with an estimated 500 000 species. We present the first phylogenetic analysis of the superfamily based on both morphological and molecular data. A web-based, systematics workbench mx was used to score 945 character states illustrated by 648 figures for 233 morphological characters for a total of 66 645 observations for 300 taxa. The matrix covers 22 chalcidoid families recognized herein and includes 268 genera within 78 of 83 subfamilies. Morphological...

Data from: The evolution of trade-offs under directional and correlational selection

Derek A. Roff & Daphne J. Fairbairn
Using quantitative genetic theory we develop predictions for the evolution of trade-offs in response to directional and correlational selection. We predict that directional selection favoring an increase in one trait in a trade-off will result in change in the intercept but not the slope of the trade-off function, with the mean value of the selected trait increasing and that of the correlated trait decreasing. Natural selection will generally favor an increase in some combination of...

Data from: Generalized linear mixed models for mapping multiple quantitative trait loci

Xiaohong Che & Shizhong Xu
Many biological traits are discretely distributed in phenotype but continuously distributed in genetics because they are controlled by multiple genes and environmental variants. Due to the quantitative nature of the genetic background, these multiple genes are called quantitative trait loci (QTL). When the QTL effects are treated as random, they can be estimated in a single generalized linear mixed model (GLMM), even if the number of QTL may be larger than the sample size. The...

Data from: Local adaptation and the evolution of phenotypic plasticity in Trinidadian guppies (Poecilia reticulata)

Julián Torres-Dowdall, Corey A. Handelsman, Cameron K. Ghalambor & David N. Reznick
Divergent selection pressures across environments can result in phenotypic differentiation that is due to local adaptation, phenotypic plasticity, or both. Trinidadian guppies exhibit local adaptation to the presence or absence of predators, but the degree to which predator-induced plasticity contributes to population differentiation is less clear. We conducted common garden experiments on guppies obtained from two drainages containing populations adapted to high- and low-predation environments. We reared full-sibs from all populations in treatments simulating the...

Registration Year

  • 2012
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Affiliations

  • University of California, Riverside
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  • University of California System
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  • Duke University
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  • Texas A&M University
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  • Naturhistorisches Museum
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  • Charles University
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  • San Diego State University
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  • ZheJiang Academy of Agricultural Sciences
    1
  • National Academy of Sciences
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  • University of Toronto
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