A5090417712- Avian ecology and behavior
- Wildlife Ecology and Conservation
- Animal Behavior and Reproduction
- Fish Ecology and Management Studies
- Bird parasitology and diseases
- Rangeland and Wildlife Management
- Marine animal studies overview
- Species Distribution and Climate Change
- Genetic and phenotypic traits in livestock
- Animal Ecology and Behavior Studies
- Animal Nutrition and Physiology
- Indigenous Studies and Ecology
- Genetic diversity and population structure
- Isotope Analysis in Ecology
- Ecology and Vegetation Dynamics Studies
- Ecology and biodiversity studies
- Viral Infections and Vectors
- Toxoplasma gondii Research Studies
- Mercury impact and mitigation studies
- Cryospheric studies and observations
- Rabies epidemiology and control
- Herpesvirus Infections and Treatments
- Marine and fisheries research
- Vector-borne infectious diseases
- Parasite Biology and Host Interactions
Environment and Climate Change Canada
2016-2025
University of Saskatchewan
2014-2025
Swedish University of Agricultural Sciences
2009
McGill University
2009
Agriculture and Agri-Food Canada
2009
University of Alberta
2009
Memorial University of Newfoundland
2009
Ducks Unlimited Canada
2004
Técnicas Reunidas (Spain)
2004
Acadia University
1999
Journal Article Stable-Nitrogen Isotope Enrichment in Avian Tissues Due to Fasting and Nutritional Stress: Implications for Isotopic Analyses of Diet Get access Keith A. Hobson, Hobson Department Biology, University Saskatchewan, Saskatoon, Saskatchewan S7N 0 WO, Canada Canadian Wildlife Service, 115 Perimeter Road, OX4, Search other works by this author on: Oxford Academic Google Scholar Ray T. Alisauskas, Alisauskas Robert G. Clark The Condor, Volume 95, Issue 2, 1 May 1993, Pages 388–394,...
Abstract The Mid‐Continent Population of the lesser snow goose, which breeds in eastern and central Canadian Arctic sub‐Arctic, winters southern United States northern Mexico has increased 5–7% annually from late 1960s to mid‐1990s, largely because survival response an agricultural food subsidy. rise numbers complements use nitrogen fertilizers a corresponding yields rice, corn, wheat along flyways on wintering grounds. In sub‐Arctic migration areas at breeding colonies, foraging by high...
Abstract We assessed the effectiveness of an extensive and unprecedented wildlife reduction effort directed at a wide‐ranging migratory population geese. Population efforts that targeted several populations light geese (greater snow [ Chen caerulescens atlantica ], lesser C. c. Ross's rossii ]) began in 1999 central eastern North America. Such were motivated by broad consensus abundance these was causing serious ecological damage to terrestrial salt marsh ecosystems parts Canadian Arctic...
Reports of fading vole and lemming population cycles persisting low populations in some parts the Arctic have raised concerns about spread these fundamental changes to tundra food web dynamics. By compiling 24 unique time series fluctuations across circumpolar region, we show that virtually all displayed alternating periods cyclic/non-cyclic over past four decades. Cyclic patterns were detected 55% ( n = 649 years pooled sites) with a median periodicity 3.7 years, non-cyclic not more...
We employ mitochondrial (mt) DNA markers to examine the matrilineal component of population genetic structure in snow goose Chen caerulescens. From banding returns, it is known that females typically nest at their natal or prior site, whereas males pair with on mixed wintering grounds and mediate considerable nuclear gene flow between geographically separate breeding colonies. Despite site philopatry documented for females, mtDNA show no clear distinctions nesting populations across species'...
Journal Article The Role of Nutrient Reserves in Limiting Waterfowl Reproduction Get access C. Davison Ankney, Ankney Department Zoology, University Western Ontario, London, Ontario N6A 5B7, Canada. Search for other works by this author on: Oxford Academic Google Scholar Alan D. Afton, Afton Fish and Wildlife Service, Louisiana Cooperative Research Unit, State University, Baton Rouge, LA 70803. Ray T. Alisauskas Canadian 115 Perimeter Road, Saskatoon, Saskatchewan S7N OX4, Condor, Volume 93,...
To investigate the bioenergetics of reproduction in American Coots (Fulica americana) we collected 108 males and 93 females at Delta Marsh, southern Manitoba, 1981. Prenesting nesting birds were analyzed for fat, protein, ash content nonreproductive tissue. For females, these values compared to nutrient requirements reproductive tissue during egg-laying. We suggest that feeding conditions before arrival can affect subsequent output. Fat reserves may function as a threshold influences...
A full understanding of population dynamics depends not only on estimation mechanistic contributions recruitment and survival, but also knowledge about the ecological processes that drive each these vital rates. The process in particular may be protracted over several years, can depend numerous complexities until sexually mature adulthood is attained. We addressed long-term declines (23 breeding seasons, 1992-2014) per capita production young by both Ross's Geese (Chen rossii) Lesser Snow...
I examined fall age ratios of midcontinent lesser snow geese (Chen caerulescens) shot by hunters in the Central and Mississippi flyways (1962-1999), spring nutrient reserves southern Manitoba, Canada (Apr-May, 1983-1984, 1988-1993). Age were inversely related (95%[β S ] = -0.170 ± 0.068) to severity arctic weather as indexed average depth during May June, mean June temperatures. After accounting for this effect, declined 0.017 0.009 immatures/adults/year 1962-1999. Body size, principal...
Journal Article Nutrient-Reserve Dynamics and Diet of Breeding Female Gadwalls Get access C. Davison Ankney, Ankney Department Zoology, University Western Ontario, London, Ontario N6A 5B7, Canada Search for other works by this author on: Oxford Academic Google Scholar Ray T. Alisauskas Delta Waterfowl Wetlands Research Station, R.R.#l, Portage Ia Prairie, Manitoba RJN 3Al, The Condor, Volume 93, Issue 4, 1 November 1991, Pages 799–810, https://doi.org/10.2307/3247714 Published: 01 1991...
Abstract Estimates of range‐wide abundance, harvest, and harvest rate are fundamental for sound inferences about the role exploitation in dynamics free‐ranging wildlife populations, but reliability existing survey methods abundance estimation is rarely assessed using alternative approaches. North American mallard populations have been surveyed each spring since 1955 internationally coordinated aerial surveys, population size can also be estimated with Lincoln's method banding data. We late...
ABSTRACT In the final decades of nineteenth century, concern was building about status migratory bird populations in North America. this literature review, we describe how that led to a landmark conservation agreement 1916, between United States and Great Britain (on behalf Canada) conserve birds shared by Canada States. Drawing on published our personal experience, subsequent enabling acts both countries gave rise efforts better estimate population sizes distributions, assess harvest rates...
I evaluated the composition of 97 fresh eggs and 43 one-day-old chicks American Coot (Fulica americana) to determine if constituents or show allometry. Heavier contained proportionately less albumen but more yolk, consequently had a higher energy density than lighter eggs. Albumen weight varied among within clutches, presumably due variation in qualities coot territories during nesting. Within lipid content declined with laying sequence, weights remained constant. Moreover, newly hatched...
Decisions about habitat management for lesser snow geese (Chen caerulescens caerulescens) during spring migration are limited by the lack of information concerning their use and diets. Consequently, we examined esophageal contents, use, activity patterns, feeding behavior adult-plumaged from Oklahoma (Mar) to coast Hudson Bay (May), Ontario, in 1983-84
We studied the effects of dietary fiber, plant versus animal diets, and diet diversity on digestive organ morphology captive Mallards (Anas platyrhynchos). Four experimental diets were used: whole corn (low plant), trout chow primarily animal), rabbit (high a diverse consisting each preceding fed daily in random order. Every 5 days for 25 days, we sampled birds from group (N = 6–8) weighed bird its abdominal fat, gizzard, ceca, small intestine, liver, then measured ceca intestine length....
1 Many ecosystems are characterized by pulses of dramatically higher than normal levels foods (pulsed resources) to which animals often respond caching for future use. However, the extent use cached and how this varies in relation fluctuations other is poorly understood most animals. 2 Arctic foxes Alopex lagopus (L.) cache thousands eggs annually at large goose colonies where superabundant during nesting period geese. We estimated contribution arctic fox diets spring autumn, when geese were...
The zoonotic parasite, Toxoplasma gondii, has a worldwide distribution and cosmopolitan suite of hosts. In arctic tundra regions, the definitive felid hosts are rare to absent and, while complete transmission routes in such regions have yet be fully elucidated, trophic vertical likely important. Wild birds common intermediate T. central Canadian arctic, geese probable vectors parasite from temperate latitudes regions. Our objective was estimate seroprevalence gondii Ross's Lesser Snow Geese...
Echinococcus multilocularis is a zoonotic cestode with distribution encompassing the northern hemisphere that causes alveolar hydatid disease in people and other aberrant hosts. E. not genetically uniform across its distribution, which may have implications for transmission pathogenicity. Recent findings of European-type haplotype wildlife one location western Canada motivated broader survey diversity this parasite from Canada. We obtained intact adult cestodes intestines 41 wild canids...
The biodiversity working group of the Arctic Council has developed pan-Arctic monitoring plans to improve our ability detect, understand and report on long-term change in biodiversity. fox (Vulpes lagopus) was identified as a target future because its circumpolar distribution, ecological importance reliance ecosystems. We provide first exhaustive survey contemporary programmes, describing 34 projects located eight countries. Monitored populations covered equally four climate zones species’...
We conducted an experiment to examine the effect of neckbands, controlling for differences in sex, species and year study (1991-1997), on probabilities capture, survival, reporting, fidelity non-breeding small Canada ( Branta canadensis hutchinsi ) white-fronted Anser albifrons frontalis geese. In Canada's central arctic, we systematically double-marked about half individuals from each with neckbands legbands, marked other only legbands. considered 48 a priori models that included...