Data from: Fitness decline in spontaneous mutation accumulation lines of Caenorhabditis elegans with varying effective population sizesVaishali Katju, Lucille B. Packard, Lijing Bu, Peter David Keightley & Ulfar Bergthorsson
The rate and fitness effects of new mutations have been investigated by mutation accumulation (MA) experiments in which organisms are maintained at a constant minimal population size to facilitate the accumulation of mutations with minimal efficacy of selection. We evolved 35 MA lines of Caenorhabditis elegans in parallel for 409 generations at three population sizes (N = 1, 10, and 100), representing the first spontaneous long-term MA experiment at varying population sizes with corresponding differences...
Data from: Assembly of root-associated bacteria communities: interactions between abiotic and biotic factorsSarah L. Dean, Emily C. Farrer, Andrea Porras-Alfaro, Katharine N. Suding & Robert L. Sinsabaugh
Nitrogen (N) deposition in many areas of the world is over an order of magnitude greater than it would be in absence of human activity. We ask how abiotic (N) and biotic (plant host and neighborhood) effects interact to influence root-associated bacterial (RAB) community assembly. Using 454 pyrosequencing, we examined RAB communities from two dominant alpine tundra plants, Geum rossii and Deschampsia cespitosa, under control, N addition and D. cespitosa removal treatments, implemented in a...
Genetic determinants of seasonal reproduction are not fully understood, but may be important predictors of organism responses to climate change. We used a comparative approach to study the evolution of seasonal timing within a fish community in a natural common garden setting. We tested the hypothesis that allelic length variation in the PolyQ domain of a circadian rhythm gene, Clock1a, corresponded to interspecific differences in seasonal reproductive timing across five native and one introduced cyprinid...
Data from: Migrate small, sound big: functional constraints on body size promote tracheal elongation in cranesMatthew R. Jones & Christopher C. Witt
Organismal traits often represent the outcome of opposing selection pressures. While social or sexual selection can cause the evolution of traits that constrain function or survival (e.g., ornamental feathers), it is unclear how the strength and direction of selection respond to ecological shifts that increase the severity of the constraint. For example, reduced body size might evolve by natural selection to enhance flight performance in migratory birds, but social or sexual selection favoring large body...
Data from: QTL mapping identifies candidate alleles involved in adaptive introgression and range expansion in a wild sunflowerKenneth D. Whitney, Karl W. Broman, Nolan C. Kane, Stephen M. Hovick, Rebecca A. Randell & Loren H. Rieseberg
The wild North American sunflowers Helianthus annuus and H. debilis are participants in one of the earliest identified examples of adaptive trait introgression, and the exchange is hypothesized to have triggered a range expansion in H. annuus. However, the genetic basis of the adaptive exchange has not been examined. Here, we combine quantitative trait locus (QTL) mapping with field measurements of fitness to identify candidate H. debilis QTL alleles likely to have introgressed into H....
Incomplete observation is an important yet often neglected feature of observational ecological timeseries. In particular, observational case report timeseries of childhood diseases have played an important role in the formulation of mechanistic dynamical models of populations and metapopulations. Yet to our knowledge, no comprehensive study of childhood disease reporting probabilities (commonly referred to as reporting rates) has been conducted to date. Here, we provide a detailed analysis of measles and whooping cough reporting probabilities in...
Data from: Differential high-altitude adaptation and restricted gene flow across a mid-elevation hybrid zone in Andean tit-tyrant flycatchersShane G. DuBay & Christopher C. Witt
The tropical Andes are a global hotspot of avian diversity that is characterized by dramatic elevational shifts in community composition and a preponderance of recently evolved species. Bird habitats in the Andes span a nearly two-fold range of atmospheric pressure that poses challenges for respiration, thermoregulation, water balance, and powered flight, but the extent to which physiological constraints limit species’ elevational distributions is poorly understood. We report a previously unknown hybrid zone between recently diverged...
1. Historically, mutualisms have been considered to be less important than antagonisms in affecting the composition of ecological communities. In plant communities, beneficial microbes may feature as keystone mutualists in structuring community composition. Understanding the direction and magnitude of mutualist effects at the community scale may be critical for making accurate predictions on plant responses to climate change, particularly for mutualists that ameliorate climate-induced stressors. Such mitigation could shift outcomes between mutualist-enhanced species diversity and...
Increasing data have supported the importance of divergence with gene flow (DGF) in the generation of biological diversity. In such cases, lineage divergence occurs on a shorter timescale than does the completion of reproductive isolation. Although it is critical to explore the mechanisms driving divergence and preventing homogenization by hybridization, it is equally important to document cases of DGF in nature. Here we synthesize data that have accumulated over the last dozen or so years...
Data from: Comparative riverscape genetics reveals reservoirs of genetic diversity for conservation and restoration of Great Plains fishes.Megan J. Osborne, Joshuah S. Perkin, Keith B. Gido, Tom F. Turner & Thomas F. Turner
We used comparative landscape genetics to examine the relative roles of historical events, intrinsic traits, and landscape factors in determining the distribution of genetic diversity of river fishes across the North American Great Plains. Spatial patterns of diversity were overlaid on a patch-based graphical model, and then compared within and among three species that co-occurred across five Great Plains watersheds. Species differing in reproductive strategy (benthic vs. pelagic spawning) were hypothesized to have different patterns...
University of New Mexico10
Denver Museum of Nature and Science1
University of Montana1
The Ohio State University1
University of Louisville1
University of Edinburgh1
University of Wisconsin-Madison1
Indiana University Bloomington1
Western Illinois University1
University of Colorado Boulder1