6 Works

Data from: Moving beyond linear food chains: trait-mediated indirect interactions in a rocky intertidal food web

Geoffrey C. Trussell, Catherine M. Matassa & Patrick J. Ewanchuk
In simple, linear food chains, top predators can have positive indirect effects on basal resources by causing changes in the traits (e.g. behaviour, feeding rates) of intermediate consumers. Although less is known about trait-mediated indirect interactions (TMIIs) in more complex food webs, it has been suggested that such complexity dampens trophic cascades. We examined TMIIs between a predatory crab (Carcinus maenas) and two ecologically important basal resources, fucoid algae (Ascophyllum nodosum) and barnacles (Semibalanus balanoides),...

Data from: Multiple paternity in the Norway rat, Rattus norvegicus, from urban slums in Salvador, Brazil

Federico Costa, Jonathan L. Richardson, Kirstin Dion, Carol Mariani, Arsinoe C. Pertile, Mary K. Burak, James E. Childs, Albert I. Ko & Adalgisa Caccone
The Norway rat, Rattus norvegicus, is one of the most important pest species globally and the main reservoir of leptospires causing human leptospirosis in the urban slums of tropical regions. Rodent control is a frequent strategy in those settings to prevent the disease but rapid growth from residual populations and immigration limit the long-term effectiveness of interventions. To characterize the breeding ecology of R. norvegicus and provide needed information for the level of genetic mixing,...

Data from: Physiological effects of temperature do not explain prevalence of females in populations of gynodioecious Lobelia siphilitica growing in warmer climates

Maia F. Bailey, Andrea L. Case & Christina M. Caruso
PREMISE OF THE STUDY: Gynodioecy is a sexual polymorphism whereby female and hermaphroditic plants co-occur within populations. In many gynodioecious species, stressful abiotic environments are associated with higher frequencies of females. This association suggests that abiotic stress affects the relative fitness of females and hermaphrodites and, thus, the maintenance of gynodioecy. METHODS:To test whether abiotic stress affects the fitness of females and hermaphrodites, we grew open-pollinated Lobelia siphilitica families in temperature regimes characteristic of the...

Data from: Broad-scale geographic variation in the organization of rocky intertidal communities in the Gulf of Maine

Elizabeth S. Bryson, Patrick J. Ewanchuk & Geoffrey C. Trussell
A major challenge facing ecology is to better understand how large-scale processes modify local scale processes to shape the organization of ecological communities. Although the results of ecological experiments are repeatable on local scales, different results often emerge across broad scales, which can hinder the development of general predictions that apply across the geographical range of a community. Numerous studies in the southern Gulf of Maine have shaped our understanding of community organization and dynamics...

Data from: Incorporating evolutionary insights to improve ecotoxicology for freshwater species

Steven P. Brady, Jonathan L. Richardson & Bethany K. Kunz
Ecotoxicological studies have provided extensive insights into the lethal and sublethal effects of environmental contaminants. These insights are critical for environmental regulatory frameworks, which rely on knowledge of toxicity for developing policies to manage contaminants. While varied approaches have been applied to ecotoxicological questions, perspectives related to the evolutionary history of focal species or populations have received little consideration. Here, we evaluate chloride toxicity from the perspectives of both macroevolution and contemporary evolution. First, by...

Data from: Urban rat races: spatial population genomics of brown rats (Rattus norvegicus) compared across multiple cities

Matthew Combs, Kaylee A. Byers, Bruno M. Ghersi, Michael J. Blum, Adalgisa Caccone, Federico Costa, Chelsea G. Himsworth, Jonathan L. Richardson & Jason Munshi-South
Urbanization often substantially influences animal movement and gene flow. However, few studies to date have examined gene flow of the same species across multiple cities. In this study, we examine brown rats (Rattus norvegicus) to test hypotheses about the repeatability of neutral evolution across four cities: Salvador, Brazil; New Orleans, USA; Vancouver, Canada; New York City, USA. At least 150 rats were sampled from each city and genotyped for a minimum of 15,000 genome-wide SNPs....

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