10 Works

Data from: Past tree influence and prescribed fire mediate biotic interactions and community reassembly in a grassland-restoration experiment

Charles B. Halpern, Joseph A. Antos, Donald McKenzie & Annette M. Olson
Woody plant encroachment of grasslands is occurring globally, with profound ecological consequences. Attempts to restore herbaceous dominance may fail if the woody state is resilient or if intervention leads to an alternate, undesirable state. Restoration outcomes often hinge on biotic interactions – particularly on priority effects that inhibit or promote community reassembly. Following experimental tree removal from conifer-invaded grasslands, we documented substantial variation in community reassembly associated with the changing abundance of the native clonal...

Data from: Adaptive genetic variation mediates bottom-up and top-down control in an aquatic ecosystem

Seth M. Rudman, Mariano A. Rodriguez-Cabal, Adrian Stier, Takuya Sato, Julian Heavyside, Rana W. El-Sabaawi & Gregory M. Crutsinger
Research in eco-evolutionary dynamics and community genetics has demonstrated that variation within a species can have strong impacts on associated communities and ecosystem processes. Yet, these studies have centred around individual focal species and at single trophic levels, ignoring the role of phenotypic variation in multiple taxa within an ecosystem. Given the ubiquitous nature of local adaptation, and thus intraspecific variation, we sought to understand how combinations of intraspecific variation in multiple species within an...

Data from: Sex without sex chromosomes: genetic architecture of multiple loci independently segregating to determine sex ratios in the copepod Tigriopus californicus

Heather J. Alexander, Jean M. L. Richardson, Suzanne Edmands & Bradley R. Anholt
Sex determining systems are remarkably diverse and may evolve rapidly. Polygenic sex determination systems are predicted to be transient and evolutionarily unstable yet examples have been reported across a range of taxa. Here we provide the first direct evidence of polygenic sex determination in Tigriopus californicus, a harpacticoid copepod with no heteromorphic sex chromosomes. Using genetically distinct inbred lines selected for male- and female-biased clutches, we generated a genetic map with 39 SNPs across 12...

Data from: Rethinking refugia: tree topology, divergence dates, and demographic history trace the distribution of the endangered Plymouth gentian (Sabatia kennedyana) from the Pleistocene glaciation to present day

Adriana Suarez-Gonzalez, Jolene T. Sutton, Andrew J. Trant, Elena Zamlynny & Sara V. Good
Premise of study: Molecular population genetics is a powerful tool to infer how species responded to past environmental change. In the northern hemisphere, interest is increasing in how species responded to changes in ice coverage and temperature during the last glaciation maximum (LGM, between 18000–21000 yr ago) with a common assumption that glacial refugia were located at the southern edge of a species range. Methods: We reconstructed the glacial and postglacial phylogeography of Sabatia kennedyana,...

Data from: Species turnover (β diversity) in ectomycorrhizal fungi linked to NH4+ uptake capacity

John M. Kranabetter, Barbara J. Hawkins, Melanie D. Jones, Samantha Robbins, Tyler Dyer & Tao Li
Ectomycorrhizal (EcM) fungal communities may be shaped by both deterministic and stochastic processes, potentially influencing ecosystem development and function. We evaluated community assembly processes for EcM fungi of Pseudotsuga menziesii among 12 sites up to 400 km apart in southwest British Columbia (Canada) by investigating species turnover (β diversity) in relation to soil nitrogen (N) availability and physical distance. We then examined functional traits for an N-related niche by quantifying net fluxes of NH4+, NO3-...

Data from: Vicariance, long-distance dispersal, and regional extinction–recolonization dynamics explain the disjunct circumpolar distribution of the arctic-alpine plant Silene acaulis

Galina Gussarova, Geraldine A. Allen, Yulia Mikhaylova, Laurie J. McCormick, Virginia Mirré, Kendrick L. Marr, Richard J. Hebda & Christian Brochmann
PREMISE OF THE STUDY: Many arctic-alpine species have vast geographic ranges, but these may encompass substantial gaps whose origins are poorly understood. Here we address the phylogeographic history of Silene acaulis, a perennial cushion plant with a circumpolar distribution except for a large gap in Siberia. METHODS: We assessed genetic variation in a range-wide sample of 103 populations using plastid DNA (pDNA) sequences and AFLPs (amplified fragment length polymorphisms). We constructed a haplotype network and...

Data from: A comprehensive analysis of teleost MHC class I sequences

Unni Grimholt, Kentaro Tsukamoto, Teruo Azuma, Jong Leong, Ben F. Koop & Johannes M. Dijkstra
Background: MHC class I (MHCI) molecules are the key presenters of peptides generated through the intracellular pathway to CD8-positive T-cells. In fish, MHCI genes were first identified in the early 1990′s, but we still know little about their functional relevance. The expansion and presumed sub-functionalization of cod MHCI and access to many published fish genome sequences provide us with the incentive to undertake a comprehensive study of deduced teleost fish MHCI molecules. Results: We expand...

Data from: Mixed-ancestry and admixture in Kaua’i’s feral chickens: invasion of domestic genes into ancient Red Junglefowl reservoirs?

Eben Gering, Martin Johnsson, Pamela Willis, Thomas Getty & Dominic Wright
A major goal of invasion genetics is to determine how establishment histories shape non-native organisms' genotypes and phenotypes. While domesticated species commonly escape cultivation to invade feral habitats, few studies have examined how this process shapes feral gene pools and traits. We collected genomic and phenotypic data from feral chickens (Gallus gallus) on the Hawaiian island of Kauai to (i) ascertain their origins and (ii) measure standing variation in feral genomes, morphology and behaviour. Mitochondrial...

Data from: Oxygen limitations on marine animal distributions and the collapse of epibenthic community structure during shoaling hypoxia

Jackson W. F. Chu & Verena Tunnicliffe
Deoxygenation in the global ocean is predicted to induce ecosystem-wide changes. Analysis of multidecadal oxygen time-series projects the northeast Pacific to be a current and future hot spot of oxygen loss. However, the response of marine communities to deoxygenation is unresolved due to the lack of applicable data on component species. We repeated the same benthic transect (n = 10, between 45 and 190 m depths) over 8 years in a seasonally hypoxic fjord using...

Data from: The unique ecology of human predators

Chris T. Darimont, Caroline H. Fox, Heather M. Bryan & Thomas E. Reimchen
Paradigms of sustainable exploitation focus on population dynamics of prey and yields to humanity but ignore the behavior of humans as predators. We compared patterns of predation by contemporary hunters and fishers with those of other predators that compete over shared prey (terrestrial mammals and marine fishes). Our global survey (2125 estimates of annual finite exploitation rate) revealed that humans kill adult prey, the reproductive capital of populations, at much higher median rates than other...

Registration Year

  • 2015
    10

Resource Types

  • Dataset
    10

Affiliations

  • University of Victoria
    10
  • University of British Columbia
    3
  • Yunnan University
    1
  • Acadia University
    1
  • University of Washington
    1
  • Oregon State University
    1
  • Royal British Columbia Museum
    1
  • United States Department of Agriculture
    1
  • University of Oslo
    1
  • University of Winnipeg
    1