Data from: Self-fertilization and the role of males in populations of tadpole shrimp (Branchiopoda: Notostraca: Triops)Rebekah L. Horn & David E. Cowley
Self-fertilization has both negative and positive fitness effects on species evolution. Selfing can increase inbreeding depression, thereby decreasing genetic diversity. In contrast, self-fertilization can preserve beneficial gene combinations and facilitate colonization success. Within the class of crustaceans Branchiopoda, selfing is a primary reproductive mode. Some species of Triops, in the family Notostraca, are a few of the animal species thought to have a mixed mating system between hermaphrodites and males termed androdioecy. The objective of...
Data from: Linking isotopes and panmixia: high within-colony variation in feather δ2H, δ13C, and δ15N across the range of the American white pelicanMatthew W. Reudink, Christopher J. Kyle, Ann E. McKellar, Christopher M. Somers, Robyn L.F. Reudink, T. Kurt Kyser, Samantha E. Franks & Joseph J. Nocera
Complete panmixia across the entire range of a species is a relatively rare phenomenon; however, this pattern may be found in species that have limited philopatry and frequent dispersal. American white pelicans (Pelecanus erythrorhyncos) provide a unique opportunity to examine the role of long-distance dispersal in facilitating gene flow in a species recently reported as panmictic across its broad breeding range. This species is also undergoing a range expansion, with new colonies arising hundreds of...
Data from: Woodstoich III: integrating tools of nutritional geometry and ecological stoichiometry to advance nutrient budgeting and the prediction of consumer-driven nutrient recyclingErik Sperfeld, Halvor M. Halvorson, Matthew Malishev, Fiona J. Clissold & Nicole D. Wagner
Within the last two decades, ecological stoichiometry (ES) and nutritional geometry (NG, also known as geometric framework for nutrition) have delivered novel insights into core questions of nutritional ecology. These two nutritionally explicit frameworks differ in the ‘nutrient currency’ used and the focus of their past research; behavioural feeding strategies in NG, mainly investigating terrestrial organisms, and trophic ecology in ES, mainly in aquatic settings. However, both NG and ES have developed in explaining patterns...
Global warming threatens to reduce population connectivity for terrestrial wildlife through significant and rapid changes to sea ice. Using genetic fingerprinting, we contrasted extant connectivity in island-dwelling Peary caribou in northern Canada with continental-migratory caribou. We next examined if sea-ice contractions in the last decades modulated population connectivity and explored the possible impact of future climate change on long-term connectivity among island caribou. We found a strong correlation between genetic and geodesic distances for both...
Data from: Patchy distribution and low effective population size raise concern for an at-risk top predatorLinda Y. Rutledge, Glenn Desy, John M. Fryxell, Kevin Middel, Bradley N. White & Brent R. Patterson
Aim: Understanding carnivore distribution is important for management decisions that aim to restore naturally-regulated ecosystems and preserve biodiversity. Eastern Wolves, a species at risk in Canada, are centralized in Algonquin Provincial Park and their ability to disperse and establish themselves elsewhere is limited by human-caused mortality associated with hunting, trapping, and vehicle collisions. Here, we refine our understanding of Eastern Wolf distribution and provide the first estimates of their effective population size. Location: Southern Ontario...
Data from: Correlated paternity measures mate monopolization and scales with the magnitude of sexual selectionMarcel E. Dorken & Laura E. Perry
Indirect measures of sexual selection have been criticized because they can overestimate the magnitude of selection. In particular, they do not account for the degree to which mating opportunities can be monopolized by individuals of the sex that compete for mates. We introduce a measure of mate monopolization (m) based on the magnitude of correlated paternity and evaluate its ability to track changes in the magnitude of sexual selection. Simulation models were used to compare...
Data from: Bioinformatic processing of RAD-seq data dramatically impacts downstream population genetic inferenceAaron B. A. Shafer, Claire R. Peart, Sergio Tusso, Inbar Maayan, Alan Brelsford, Christopher W. Wheat & Jochen B. W. Wolf
Restriction site-associated DNA sequencing (RAD-seq) provides high-resolution population genomic data at low cost, and has become an important component in ecological and evolutionary studies. As with all high-throughput technologies, analytic strategies require critical validation to ensure accurate and unbiased interpretation. To test for the impact of bioinformatic data processing on downstream population genetic inferences, we analysed mammalian RAD-seq data (>100 individuals) with 312 combinations of methodology (de novo vs. mapping to references of increasing divergence)...
Data from: De novo assembly of a tadpole shrimp (Triops newberryi) transcriptome and preliminary differential gene expression analysisRebekah L. Horn, Thiruvarangan Ramaraj, Nicholas P. Devitt, Faye D. Schilkey & David E. Cowley
Next-generation sequencing techniques, such as RNA sequencing, have provided a wealth of genomic information for nonmodel species. Transcriptomic information can be used to quantify the patterns of gene expression, which can identify how environmental differences invoke organismal stress responses and provide a gauge in predicting species adaptability. In our study, we used RNA sequencing to characterize the first transcriptome from a naupliar tadpole shrimp (Triops newberryi) to identify the genes expressed during the early life...
Data from: Assessing polar bear (Ursus maritimus) population structure in the Hudson Bay region using SNPsMichelle Viengkone, Andrew Edward Derocher, Evan Shaun Richardson, René Michael Malenfant, Joshua Moses Miller, Martyn E. Obbard, Markus G. Dyck, Nick J. Lunn, Vicki Sahanatien & Corey S. Davis
Defining subpopulations using genetics has traditionally used data from microsatellite markers to investigate population structure; however, single-nucleotide polymorphisms (SNPs) have emerged as a tool for detection of fine-scale structure. In Hudson Bay, Canada, three polar bear (Ursus maritimus) subpopulations (Foxe Basin (FB), Southern Hudson Bay (SH), and Western Hudson Bay (WH)) have been delineated based on mark–recapture studies, radiotelemetry and satellite telemetry, return of marked animals in the subsistence harvest, and population genetics using microsatellites....
Data from: Small-scale and regional spatial dynamics of an annual plant with contrasting sexual systemsMarcel E. Dorken, Robert P. Freckleton & John R. Pannell
1.Plant demography is known to depend on both spatial dynamics and life history, but how these two factors interact is poorly understood. We conducted a longitudinal study of the wind-pollinated annual plant Mercurialis annua that varies geographically in its sexual system to investigate this interaction. 2.Metapopulation demographic models predict that regular population turnover should be a more common feature of monomorphic than dimorphic populations because males and females cannot found new populations by selfing but...
Data from: The genetic underpinnings of population cyclicity: establishing expectations for the genetic anatomy of cycling populationsJeffrey R. Row, Paul J. Wilson & Dennis L. Murray
Despite extensive research into the mechanisms underlying population cyclicity, we have little understanding of the impacts of numerical fluctuations on the genetic variation of cycling populations. Thus, the potential implications of natural and anthropogenically-driven variation in population cycle dynamics on the diversity and evolutionary potential of cyclic populations is unclear. Here, we use Canada lynx Lynx canadensis matrix population models, set up in a linear stepping-stone, to generate demographic replicates of biologically realistic cycling populations....
Understanding the evolutionary history of contemporary animal groups is essential for conservation and management of endangered species like caribou (Rangifer tarandus). In central Canada, the ranges of two caribou subspecies (barren-ground/woodland caribou) and two woodland caribou ecotypes (boreal/eastern migratory) overlap. Our objectives were to reconstruct the evolutionary history of the eastern migratory ecotype and to assess the potential role of introgression in ecotype evolution. STRUCTURE analyses identified five higher order groups (i.e. three boreal caribou...
Data from: Determinants and co-expression of anti-predator responses in amphibian tadpoles: a meta-analysisThomas Hossie, Kristen Landolt & Dennis L. Murray
A wide range of taxa respond to perceived predation risk (PPR) through inducible defenses, and many prey are capable of responding both behaviorally and morphologically to the same risk event. In cases where multiple defenses confer protection by independent means (i.e., they are mechanistically independent) responses will either be co-expressed, or the expression of one defense will limit the capacity (or need) to respond along another axis. Our ability to generate a broad understanding of...
Data from: Spatial patterns of immunogenetic and neutral variation underscore the conservation value of small, isolated American badger populationsYessica Rico, Danielle M. Ethier, Christina Davy, Josh Sayers, Rich D. Weir, Bradley J. Swanson, Joseph J. Nocera, Christopher J. Kyle, Christina M. Davy & Richard D. Weir
Small and isolated populations often exhibit low genetic diversity due to drift and inbreeding, but may simultaneously harbour adaptive variation. We investigate spatial distributions of immunogenetic variation in American badger subspecies (Taxidea taxus), as a proxy for evaluating their evolutionary potential across the northern extent of the species’ range. We compared genetic structure of 20 microsatellites and the Major histocompatibility complex (MHC) to evaluate if small isolated populations show low adaptive polymorphism relative to large...
New Mexico State University2
University of Lausanne2
University of Guelph2
Ministry of Environment1
University of Alberta1
University of Melbourne1
Ministry of Environment1
Leibniz Institute of Freshwater Ecology and Inland Fisheries1
National Center for Genome Resources1