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Timing Of Breeding Site Availability Across The North-American Arctic Partly Determines Spring Migration Schedule In A Long-Distance Neotropical Migrant, Jean François Lamarre, Gilles Gauthier, Richard B. Lanctot, Sarah T. Saalfeld, Oliver P. Love, Eric Reed, Oscar W. Johnson, Joe Liebezeit, Rebecca Mcguire, Mike Russell, Erica Nol, Laura Koloski, Felicia Sanders, Laura Mckinnon, Paul A. Smith, Scott A. Flemming, Nicolas Lecomte, Marie Andrée Giroux
Timing Of Breeding Site Availability Across The North-American Arctic Partly Determines Spring Migration Schedule In A Long-Distance Neotropical Migrant, Jean François Lamarre, Gilles Gauthier, Richard B. Lanctot, Sarah T. Saalfeld, Oliver P. Love, Eric Reed, Oscar W. Johnson, Joe Liebezeit, Rebecca Mcguire, Mike Russell, Erica Nol, Laura Koloski, Felicia Sanders, Laura Mckinnon, Paul A. Smith, Scott A. Flemming, Nicolas Lecomte, Marie Andrée Giroux
Great Lakes Institute for Environmental Research Publications
Long-distance migrants are under strong selection to arrive on their breeding grounds at a time that maximizes fitness. Many arctic birds start nesting shortly after snow recedes from their breeding sites and timing of snowmelt can vary substantially over the breeding range of widespread species. We tested the hypothesis that migration schedules of individuals co-occurring at the same non-breeding areas are adapted to average local environmental conditions encountered at their specific and distant Arctic breeding locations. We predicted that timing of breeding site availability (measured here as the average snow-free date) should explain individual variation in departure time from shared …
Lower Trophic Relations Within The Lake Ontario Invertebrate Community As Assessed By Chemical Tracers, Donald Robert Uzarski
Lower Trophic Relations Within The Lake Ontario Invertebrate Community As Assessed By Chemical Tracers, Donald Robert Uzarski
Electronic Theses and Dissertations
The lower trophic food web of Lake Ontario plays an important role in the lake’s ecosystem, yet the trophic relationships of these taxa are not well understood. Utilizing carbon (δ13C) and nitrogen (δ15N) stable isotopes as a tool to trace the flow of energy through the system, the main objective of this thesis was to understand the isotopic variability and trophic relationships of invertebrate taxa through space and season in Lake Ontario. Using an extensive dataset collected in 2012 and 2013, this study was conducted in two research chapters. The first chapter assessed variation in the isotopic signature of three …
Neurocognitive Profiles Associated With Limited English Proficiency In Cognitively Intact Adults, Maeme Adwoa Brantuo
Neurocognitive Profiles Associated With Limited English Proficiency In Cognitively Intact Adults, Maeme Adwoa Brantuo
Electronic Theses and Dissertations
A key assumption of neuropsychological testing in North America is that examinees are native speakers of English (NSE). The objective of the current study was to continue the line of investigations into the neurocognitive profiles associated with limited English proficiency (LEP). Participants were undergraduate students at a Canadian university. Data were collected from 40 NSEs and 40 participants with LEP. A battery of neuropsychological tests including measures with high (HVM) and low verbal mediation (LVM) was administered in counterbalanced order. As predicted, individuals with LEP performed more poorly on HVM measures and equivalent to NSEs on LVM measures, with some …
Life In The Slow Lane: Estimating The Metabolic Rate And Trophic Impact Of The Greenland Shark (Somniosus Microcephalus), Eric Ste-Marie
Life In The Slow Lane: Estimating The Metabolic Rate And Trophic Impact Of The Greenland Shark (Somniosus Microcephalus), Eric Ste-Marie
Electronic Theses and Dissertations
Metabolic rate is intricately linked to the ecology of organisms and can provide a framework to study the behaviour, life history, population dynamics, and trophic impact of a species. Acquiring measures of metabolic rate, however, has proven difficult for large water-breathing animals such as sharks, greatly limiting our understanding of the energetic lives of these highly threatened and ecologically important fish. The following thesis presents the first estimates of metabolic rate for one severly understudied and near-threatened species, the long-lived Greenland shark (Somniosus microcephalus). Resting and active routine metabolic rates were estimated through field respirometry conducted on four relatively large-bodied …