17 Works

Speculative Futures for Mindful Meat Consumption and Production

Alexandra Kenefick

Data from: A quantitative review of density-dependent growth and survival in salmonids: biological mechanisms, methodological biases, and management implications

Jean-Michel Matte, Fraser Dylan & Grant James
Understanding the complex variation in patterns of density-dependent individual growth and survival across populations is critical to adaptive fisheries management, but the extent to which this variation is caused by biological or methodological differences is unclear. Consequently, we conducted a correlational meta-analysis of published literature to investigate the relative importance of methodological and biological predictors on the shape and strength of density-dependent individual growth and survival in salmonids. We obtained 160 effect sizes from 75...

Data from: eDNA concentration, population size structure, and mark-recapture data

Matthew Yates, Dylan Glaser, John Post, Melania Cristescu, Dylan Fraser & Alison Derry
Organism abundance is a critical parameter in ecology, but its estimation is often challenging. Approaches utilizing eDNA to indirectly estimate abundance have recently generated substantial interest. However, preliminary correlations observed between eDNA concentration and abundance in nature are typically moderate in strength with significant unexplained variation. Here we apply a novel approach to integrate allometric scaling coefficients into models of eDNA concentration and organism abundance. We hypothesize that eDNA particle production scales non-linearly with mass,...

Data from: Latitudinal biodiversity gradients at three levels: linking species richness, population richness, and genetic diversity

Elizabeth Lawrence & Dylan Fraser
Review methods Species and population richness are the number of different species or populations in an area, respectively. Population richness can be totalled across species, within a species or averaged across species. Genetic diversity within populations can be summed or averaged across all species in an area or be averaged across an individual species. Using these definitions, we apply historical, ecological and evolutionary frameworks of species richness gradients to formulate predictions for intraspecific diversity gradients....

Data from: Temporally-variable predation risk and fear retention in Trinidadian guppies

Adam Crane, Laurence Feyten, Indar W. Ramnarine & Grant Brown
Predation fear is a unifying theme across vertebrate taxa. Here, we explored how the frequency and duration of predation risk affects post-risk fear behaviour in Trinidadian guppies. We first exposed individuals to visual cues of potential predators for 3 days, either frequently (6×/day) or infrequently (1×/day). Each exposure lasted for either a relatively brief (5 min) or long (30 min) duration, whereas a control group consisted of no risk exposures. One day later, we quantified...

Data From: Evaluating the correlation between genome-wide diversity and the release of plastic phenotypic variation in experimental translocations to novel natural environments

Matthew Yates & Dylan Fraser
Phenotypic reaction norms are often shaped and constrained by selection and are important for allowing organisms to respond to environmental change. However, selection cannot constrain reaction norms for environmental conditions that populations have not experienced. This may allow cryptic neutral genetic variation for the reaction norm to accumulate such that a release of phenotypic variation occurs when it is exposed to novel conditions. Most genomic diversity behaves as if functionally neutral. Genome-wide diversity metrics may...

Fundamentals of Health and Physical Activity

Kerri Z. Delaney & Leslie Barker
An introductory open textbook that covers the basic and contemporary issues of health and physical activity.

Peregrinatio: a Never-Ending Pilgrimage to an Unspecified End

Bernice Lamb-Senechal

Data from: Harvest-associated size reductions and genomic changes within two generations in wild walleye populations

Ella Bowles, Kia Marin, Stephanie Mogensen, Pamela Macleod & Dylan Fraser
The extent and rate of harvest-induced genetic changes in natural populations may impact population productivity, recovery and persistence. While there is substantial evidence for phenotypic changes in harvested fishes, knowledge of genetic change in the wild remains limited, as phenotypic and genetic data are seldom considered in tandem, and the number of generations needed for genetic changes to occur is not well understood. We quantified changes in size-at-age, sex-specific changes in body size, and genomic...

Cancer cells optimize elasticity for efficient migration

Ahmad Sohrabi Kashani & Muthukumaran Packirisamy
Cancer progression is associated with alternations in the cytoskeletal architecture of cells and, consequently, their mechanical properties such as stiffness. Changing the mechanics of cells enables cancer cells to migrate and invade to distant organ sites. This process, metastasis, is the main reason for cancer-related mortality. Cell migration is an essential step toward increasing the invasive potential of cells. Although many studies have shown that the migratory speed and the invasion of cells can be...

Shade-growing practices lessen the impact of coffee plantations on multiple dimensions of ant diversity

Javier Ibarra-Isassi, Tanya Handa, Anderson Arenas-Clavijo, Selene Escobar-Ramirez, Inge Armbrecht & Jean-Philippe Lessard
1. Land use management influence changes in biodiversity beyond the targeted species. Management practices in coffee plantations have shifted from coffee growing below accompanying (shade) trees, to intensified monocultures in which coffee grows fully exposed to the sun. Anthropogenic disturbance causes changes in species composition relative to adjacent natural patches and reduces their biotic heterogeneity. Here, we assessed the impact of coffee plantation management practices on the taxonomical, phylogenetic, and functional composition of ant communities,...

Introduction : The Body is the Place Where Pilgrimage Happens

Sara Terreault

Pilgrimage, Existence, and Psychic Distress: An Exploration of the Bodily and Psychic Phenomenon of Pilgrimage

Christine Jamieson
In ‘Pilgrimage, Existence, and Psychic Distress,’ Christine Jamieson draws on the work of psychoanalyst and linguist Julia Kristeva, tracking the haunting desire for healing and liberation inherent in pilgrimage as it touches the deep and irresolutely corporeal experience of what it means to be human.

Great smoky mountain ant community composition

Nathan J. Sanders, Jean-Philippe Lessard & Robert R. Dunn
Disentangling the drivers of diversity gradients can be challenging. The Measurement of Biodiversity (MoB) framework decomposes scale-dependent changes in species diversity into three components of community structure: the species abundance distribution (SAD), the total community abundance, and the within-species spatial aggregation. Here we extend MoB from categorical treatment comparisons to quantify variation along continuous geographic or environmental gradients. Our approach requires sites along a gradient, each consisting of georeferenced plots of abundance-based species composition data....

Temperature drives caste-specific morphological clines in ants

Jean-Philippe Lessard, François Brassard, André Francoeur & Jean-Philippe Lessard
The morphology of organisms relates to most aspects of their life history and autecology. In particular, morphology can reflect adaptation to the abiotic environment in which species occur. As such, elucidating the drivers of morphological variation along environmental gradients might give insight into processes limiting species distributions. In eusocial organisms, the concept of morphology is more complex than in solitary organisms. Eusocial insects such as ants exhibit drastic morphological differences between reproductive and worker castes....

Lower St. Lawrence Estuary bacterial 16S rRNA gene diversity

David Walsh
The Estuary and Gulf of St. Lawrence (EGSL) in eastern Canada is among the largest and most productive coastal ecosystems in the world. Very little information on bacterial diversity exists, hampering our understanding of the relationships between bacterial community structure and biogeochemical function in the EGSL. During the productive spring period, we investigated free-living and particle-associated bacterial communities across the stratified waters of the Lower St. Lawrence Estuary, including the particle-rich surface and bottom boundary...

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