13 Works

Reversal learning in FTD (fMRI)

Elizabeth Finger, Tamara Tavares, Kristy Coleman & Derek Mitchell
Objective: Frontotemporal Dementia (FTD) is a neurodegenerative disorder that results in disinhibition and difficulty with flexible responding when provided feedback. Inflexible responding is observed early in the course of the illness and contributes to the financial and social morbidities of FTD. Reversal learning is an established cognitive paradigm that indexes flexible responding in the face of feedback signaling a change in reinforcement contingencies, with components of reversal learning associated with specific neurotransmitter systems. The objective...

Cold tolerance of laboratory-reared Asian longhorned beetles

Alex Torson, Meng Lei Zhang, Kevin Ong, Lamees Mohammad, Adam Smith, Daniel Doucet, Amanda Roe & Brent Sinclair
Low winter temperatures in temperate climates can limit the success of non-native species. The Asian longhorned beetle, Anoplophora glabripennis, is an invasive wood-boring pest of hardwood trees in North America and Europe. Native A. glabripennis populations are spread across several climate zones in China and the Korean Peninsula and are likely to encounter low temperatures in at least some of this range. Understanding the lethal limits of the overwintering life stages of A. glabripennis is...

Experimental evidence for the recovery of mercury-contaminated fish populations

Lee Hrenchuk, Paul Blanchfield, John Rudd, Marc Amyot, Christopher Babiarz, Ken Beaty, Drew Bodaly, Brian Branfireun, Cynthia Gilmour, Jennifer Graydon, Britt Hall, Reed Harris, Andrew Heyes, Holger Hintelmann, James Hurley, Carol Kelly, David Krabbenhoft, Steve Lindberg, Robert Mason, Michael Paterson, Cheryl Podemski, Ken Sandilands, George Southworth, Vincent St. Louis, Lori Tate … & Michael Tate
Anthropogenic releases of mercury (Hg) are a human health issue because the potent toxicant methylmercury (MeHg), formed primarily by microbial methylation of inorganic Hg in aquatic ecosystems, bioaccumulates to high concentrations in fish consumed by humans. Predicting the efficacy of Hg pollution controls on fish MeHg concentrations is complex because many factors influence the production and bioaccumulation of MeHg. Here we conducted a 15-year whole-ecosystem, single-factor experiment to determine the magnitude and timing of reductions...

Weak interactions between strong interactors in an old-field ecosystem: Control of nitrogen cycling by coupled herbivores and detritivores

Robert Buchkowski & Oswald Schmitz
Interactions between herbivores and detritivores are common in greenhouse and laboratory experiments. Such interactions are thought to cause feedbacks in real ecosystems where the combined actions of these animals create either high or low nutrient cycling rates. There is limited evidence from factorial field experiments to support these expectations. We present the results of a three-year experiment wherein we factorially manipulated grasshopper herbivores and earthworm detritivores in an old-field ecosystem and tested for significant interaction...

Host life-history traits influence the distribution of prophages and the genes they carry

Tyler Pattenden, Christine Eagles & Lindi Wahl
Bacterial strains with a short minimal doubling time – “fast-growing” hosts – are more likely to contain prophages than their slow-growing counterparts. Pathogenic bacterial species are likewise more likely to carry prophages. We develop a bioinformatics pipeline to examine the distribution of prophages in fast- and slow-growing lysogens, and pathogenic and non-pathogenic lysogens, analysing both prophage length and gene content for each class. By fitting these results to a mathematical model of the evolutionary forces...

Endogenous biomarkers reveal diet partitioning among three sympatric species of swallows

Kaelyn Bumelis, Michael Cadman & Keith Hobson
Since the early 1990s, aerial insectivorous birds have shown serious population declines in North America, but it is not clear if factors common to all species within this guild account for these declines. Among sympatric swallows, population trends differ, and this may be due to differences in ecology operating throughout the annual cycle. Although these species all feed on aerial insects, prey taxa can differ tremendously in their “aeroecology” and use by swallows. We examined...

Data from: Selection bias in mutation accumulation

Lindi Wahl & Deepa Agashe
Mutation accumulation (MA) experiments, in which de novo mutations are sampled and subsequently characterized, are an essential tool in understanding the processes underlying evolution. In microbial populations, MA protocols typically involve a period of population growth between severe bottlenecks, such that a single individual can form a visible colony. While it has long been appreciated that the action of positive selection during this growth phase cannot be eliminated, it is typically assumed to be negligible....

Extraordinarily rapid proliferation of cultured muscle satellite cells from migratory birds

Kevin Young, Timothy Regnault & Christopher Guglielmo
Migratory birds experience bouts of muscle growth and depletion as they prepare for, and undertake prolonged flight. Our studies of migratory bird muscle physiology in vitro led to the discovery that sanderling (Calidris alba) muscle satellite cells proliferate more rapidly than other normal cell lines. Here we determined the proliferation rate of muscle satellite cells isolated from five migratory species (sanderling; ruff, Calidris pugnax; western sandpiper, Calidris mauri; yellow-rumped warbler, Setophaga coronata; Swainson’s thrush, Catharus...

The role of plant-pollinator interactions in structuring nectar microbial communities

Clara De Vega, Sergio Álvarez-Pérez, Rafael G. Albaladejo, Sandy-Lynn Steenhuisen, Marc-André Lachance, Steve D. Johnson & Carlos M. Herrera
1. Floral nectar harbours a diverse microbiome of yeasts and bacteria that depend predominantly on animal visitors for their dispersal. Since pollinators visit specific sets of flowers and carry their own unique microbiota, we hypothesize that plant species visited by the same set of pollinators may support non-random nectar microbial communities linked together by the type of pollinator. 2. Here we explore the importance of plant-pollinator interactions in the assembly of nectar microbiome and study...

Data files for: Hazardous loss of genetic diversity through selective sweeps in asexual populations

Lindi Wahl & Mark Tanaka
With the two-fold cost of sex, derived asexual organisms have an immediate reproductive advantage over their sexual sisters. Yet the "twiggy'' phylogenetic distribution of asexual lineages implies that they go extinct relatively quickly over evolutionary time. Meanwhile, bacteria and archaea have persisted for billions of years without requiring sexual reproduction. A simple explanation for this difference is that prokaryotes have very large population sizes that are not subject to the accumulation of deleterious mutations, but...

Stronger population differentiation at infection-sensing than infection-clearing innate immune loci in songbirds: different selective regimes for different defenses

Rachel Boyd, Melanie Denommé, Leanne Grieves & Elizabeth MacDougall-Shackleton
Parasite-mediated selection is widespread at loci involved in immune defence, but different defences may experience different selective regimes. For defences involved in clearing infections, purifying selection favouring a single most efficacious allele likely predominates. However, for defences involved in sensing and recognizing infections, evolutionary arms races may make positive selection particularly important. This could manifest primarily within populations (e.g., balancing selection maintaining variation) or among them (e.g., spatially varying selection enhancing population differences in allele...

No evidence for future planning in Canada Jays (Perisoreus canadensis)

Robert Martin, Glynis Martin, William Roberts & David Sherry
In the past 20 years, research in animal cognition has challenged the belief that complex cognitive processes are uniquely human. At the forefront of these challenges has been research on mental time travel and future planning in jays. We tested whether Canada Jays (Perisoreus canadensis) demonstrated future planning, using a procedure that had previously produced evidence of future planning in California Scrub-Jays (Aphelocoma californica). Future planning in this procedure is caching in locations where the...

Cache site exploitations by Canada jays (Perisoreus canadensis)

Robert Martin, Matthew Fuirst & David Sherry
This dataset examines caching preferences by Canada jays, and contains the results of three behavioural captive experiments. The first looks at overall caching preference, the second looks at the processing of olfactory information and the third investigates the influence of structural cues.

Registration Year

  • 2021
    13

Resource Types

  • Dataset
    13

Affiliations

  • Western University
    13
  • Western University
    2
  • Estación Biológica de Doñana
    1
  • University of the Free State
    1
  • University of Alberta
    1
  • University of Waterloo
    1
  • Oak Ridge National Laboratory
    1
  • University of Guelph
    1
  • University of Wisconsin-Madison
    1
  • University of Connecticut
    1