9 Works

Data from: The influence of landscape on gene flow in the eastern massasauga rattlesnake (Sistrurus c. catenatus): insight from computer simulations

Michelle F. DiLeo, Jeremy D. Rouse, José A. Dávila & Stephen C. Lougheed
Understanding how gene flow shapes contemporary population structure requires the explicit consideration of landscape composition and configuration. New landscape genetic approaches allow us to link such heterogeneity to gene flow within and among populations. However, the attribution of cause is difficult when landscape features are spatially correlated, or when genetic patterns reflect past events. We use spatial Bayesian clustering and landscape resistance analysis to identify the landscape features that influence gene flow across two regional...

Data from: Extensive sampling of polar bears (Ursus maritimus) in the Northwest Passage (Canadian Arctic Archipelago) reveals population differentiation across multiple spatial and temporal scales

Leonardo Campagna, Peter J. Van Coeverden De Groot, Brenda L. Saunders, Stephen N. Atkinson, Diana S. Weber, Markus G. Dyck, Peter T. Boag & Stephen C. Lougheed
As global warming accelerates the melting of Arctic sea ice, polar bears (Ursus maritimus) must adapt to a rapidly changing landscape. This process will necessarily alter the species distribution together with population dynamics and structure. Detailed knowledge of these changes is crucial to delineating conservation priorities. Here, we sampled 361 polar bears from across the center of the Canadian Arctic Archipelago spanning the Gulf of Boothia (GB) and M'Clintock Channel (MC). We use DNA microsatellites...

Data from: Aggressive chemotherapy and the selection of drug resistant pathogens

Silvie Huijben, Andrew S. Bell, Derek G. Sim, Danielle Tomasello, Nicole Mideo, Troy Day & Andrew F. Read
Drug resistant pathogens are one of the key public health challenges of the 21st century. There is a widespread belief that resistance is best managed by using drugs to rapidly eliminate target pathogens from patients so as to minimize the probability that pathogens acquire resistance de novo. Yet strong drug pressure imposes intense selection in favor of resistance through alleviation of competition with wild-type populations. Aggressive chemotherapy thus generates opposing evolutionary forces which together determine...

Data from: Weak habitat isolation in a threespine stickleback (Gasterosteus spp.) species pair

Laura Southcott, Laura Nagel, Todd Hatfield & Dolph Schluter
Reproductive isolation is central to the study of speciation. Multiple isolating barriers may prevent species from hybridizing, although their individual strength and the interactions between them are rarely measured. We quantified habitat isolation in a recently diverged threespine stickleback species pair (Gasterosteus aculeatus complex) and controlled for any such interactions. Using enclosures in an outdoor pond, we confirm that males of the two species strongly prefer different nesting habitats: limnetic males build nests in open...

Data from: Immune evasion and the evolution of molecular mimicry in parasites

Amy Hurford & Troy Day
Parasites that are molecular mimics express proteins which resemble host proteins. This resemblance facilitates immune evasion because the immune molecules with the specificity to react with the parasite also cross-react with the host's own proteins, and these lymphocytes are rare. Given this advantage, why are not most parasites molecular mimics? Here we explore potential factors that can select against molecular mimicry in parasites and thereby limit its occurrence. We consider two hypotheses: (1) molecular mimics...

Data from: Recurrent insect outbreaks caused by temperature-driven changes in system stability

William A. Nelson, Ottar N. Bjornstad & Takehiko Yamanaka
Insect species often undergo regular outbreaks in population density, but identifying the causal mechanism for such outbreaks in any particular species has proven difficult. Here we show that outbreak cycles in the tea tortrix Adoxophyes honmai can be explained by temperature-driven changes in system stability. Wavelet analysis of a 51yr time series spanning over 200 outbreaks reveals a threshold in outbreak amplitude each spring when temperature exceeds 15°C, and a secession of outbreaks each fall...

Data from: Three keys to the radiation of angiosperms into freezing environments

Amy E. Zanne, David C. Tank, William K. Cornwell, Jonathan M. Eastman, Stephen A. Smith, Richard G. FitzJohn, Daniel J. McGlinn, Brian C. O'Meara, Angela T. Moles, Peter B. Reich, Dana L. Royer, Douglas E. Soltis, Peter F. Stevens, Mark Westoby, Ian J. Wright, Lonnie Aarssen, Robert I. Bertin, Andre Calaminus, Rafaël Govaerts, Frank Hemmings, Michelle R. Leishman, Jacek Oleksyn, Pamela S. Soltis, Nathan G. Swenson, Laura Warman … & Alejandro Ordonez
Early flowering plants are thought to have been woody species restricted to warm habitats1, 2, 3. This lineage has since radiated into almost every climate, with manifold growth forms4. As angiosperms spread and climate changed, they evolved mechanisms to cope with episodic freezing. To explore the evolution of traits underpinning the ability to persist in freezing conditions, we assembled a large species-level database of growth habit (woody or herbaceous; 49,064 species), as well as leaf...

Data from: Taller plants have lower rates of molecular evolution

Robert Lanfear, Simon Y. W. Ho, T. Jonathan Davies, Angela T. Moles, Lonnie Aarssen, Nathan G. Swenson, Laura Warman, Amy E. Zanne & Andrew P. Allen
Rates of molecular evolution have a central role in our understanding of many aspects of species’ biology. However, the causes of variation in rates of molecular evolution remain poorly understood, particularly in plants. Here we show that height accounts for about one-fifth of the among-lineage rate variation in the chloroplast and nuclear genomes of plants. This relationship holds across 138 families of flowering plants, and when accounting for variation in species richness, temperature, ultraviolet radiation,...

Data from: Chemotherapy, within-host ecology and the fitness of drug-resistant malaria parasites

Silvie Huijben, William A. Nelson, Andrew R. Wargo, Derek G. Sim, Damien R. Drew & Andrew F. Read
A major determinant of the rate at which drug-resistant malaria parasites spread through a population is the ecology of resistant and sensitive parasites sharing the same host. Drug treatment can significantly alter this ecology by removing the drug-sensitive parasites, leading to competitive release of resistant parasites. Here, we test the hypothesis that the spread of resistance can be slowed by reducing drug treatment and hence restricting competitive release. Using the rodent malaria model Plasmodium chabaudi,...

Registration Year

  • 2013
    9

Resource Types

  • Dataset
    9

Affiliations

  • Queen's University
    9
  • University of Washington
    2
  • Department of Plant Biology
    2
  • Macquarie University
    2
  • University of British Columbia
    2
  • Pennsylvania State University
    2
  • Environmental Earth Sciences
    2
  • Utah State University
    1
  • University of Michigan-Ann Arbor
    1
  • Royal Botanic Gardens
    1