My research focuses on the interactions between predators and prey and their impact on population dynamics and food web structure. As predators play an important role in regulating ecosystems and sustaining biodiversity, most of my research on trophic interactions is significant not only academically, but also has important implications for conservation.
Members of my lab investigate direct and indirect interactions among species within food webs using a combination of field methods (e.g., mark-recapture, surveys, behavioral observation) and lab techniques (e.g., stable isotope analysis, enzyme immunoassay).
Biodiversity, Ecology and Environment
Food web dynamics,
spatial subsidies and indirect effects in food webs,
applications of stable isotope analysis
- Gharajehdaghipour T, Roth JD
Predators attract prey through ecosystem engineering in the Arctic.
- McDonald RS, Roth JD, Anderson WG
Prey cortisol affects the usefulness of fecal glucocorticoid metabolite concentration to indicate stress in a carnivore.
Canadian Journal of Zoology 96,
- Berteaux et al.
Harmonizing circumpolar monitoring of Arctic fox: benefits, opportunities, challenges, recommendations.
Polar Research 36
- Choy ES, Rosenberg B, Roth JD, Loseto LL
Inter-annual variation in environmental conditions affect the prey and body condition of eastern Beaufort Sea beluga whale (Delphinapterus leucas) population.
Marine Ecology Progress Series 579,
- Elliott KH, Roth JD, Crook K
Lipid extraction techniques for stable isotope analysis and ecological assays, Chapter 2, pp. 9-24.
Springer New York.
→ See more publications
BIOL 3318 Boreal Ecology (winter)
BIOL 3350 Methods of Data Collection & Analysis in Ecology (fall)
BIOL 4800 Arctic Field Ecology (summer)
Chloe Warret Rodrigues, PhD (in progress) Interactions between red foxes and Arctic foxes on the southern Arctic tundra
Megan Dudenhoeffer, MSc (in progress) Winter diet and population dynamics of foxes on the Arctic tundra
Jessica Lang, MSc (in progress) Red foxes as ecosystem engineers: impacts of denning on sub-Arctic flora at the taiga-tundra transition zone (co-supervised with J Markham)
Brendan Malley, MSc (in progress) Freshwater movements of anadromous Arctic Charr and Lake Charr revealed by passive acoustic telemetry (co-supervised with R Tallman)
P Kasey Ryan, PhD (in progress) Space use of beluga whales. University of Manitoba (co-supervised with C Watt)
Cody Carlyle, MSc (in progress) Spatial variation in habitat use and diet of ringed seals. University of Manitoba (co-supervised with S Ferguson)
Kyle Ritchie, MSc (2018) Ringed seal trends in abundance inferred from genetics (co-supervised with S Petersen)
Christa (Szumski) Burstahler, PhD (2018) Variation in facultative diet specialization of Canada lynx. University of Manitoba (co-supervised with D Murray)
Emily Choy, PhD (2017) The interconnectedness of diet, physiology, and physical condition in beluga whales as a sentinel species for environmental change in the Beaufort Sea ecosystem. University of Manitoba (co-supervised with L Loseto). Choy website
Jackie Verstege, MSc (2016) Fox and lemming responses to climate and snow conditions at the Arctic’s edge. University of Manitoba.
Michelle Ewacha, MSc (2016) Stress response of boreal woodland caribou, moose, and wolves to disturbance in eastern Manitoba. University of Manitoba.
Tazarve Gharajehdaghipoor, MSc (2015) Arctic foxes as ecosystem engineers: benefits to vegetation and collared lemmings through nutrient deposition. University of Manitoba.
Laura Murray, MSc (2015) Effect of nanosilver particles on metabolism and cortisol release in rainbow trout. University of Manitoba (co-supervised with M Rennie).
Danielle Mocker, MSc (2015) Diet reconstruction of wolves following a decline in Manitoba moose populations. University of Manitoba.
Andrew Coulson, MSc (2014) Agricultural subsidies affect isotopic niche size in elk and white-tailed deer. University of Manitoba.
Marci Trana, MSc (2014) Variation in blubber cortisol as a measure of stress in beluga whales of the Canadian Arctic. University of Manitoba. Trana website
Ryan McDonald, MSc (2013) Impact of prey availability and diet on stress in arctic foxes. University of Manitoba.
Olwyn Friesen, MSc (2013) Ecology of parasites in northern canids: impacts of age, sex, behavior, life history, and diet. University of Manitoba. Friesen website
Justin Brown, MS (2009) Factors affecting marine turtle egg predation by raccoons and ghost crabs on Canaveral National Seashore. University of Central Florida (co-advised with J Waterman).
Carlos Anderson, MS (2007) Individual identification of polar bears by whisker spot patterns. University of Central Florida (co-advised with J Waterman).
Brandon Barton, MS (2005) Cascading effects of predator removal on the ecology of sea turtle nesting beaches. University of Central Florida.
Laura Plog, MS (2004) Sea turtle nutrient input to dune vegetation: a stable isotope analysis. University of Central Florida (co-advised with J Weishampel).
Undergraduate Honours Students
Dominik Simard, BEnvSc Honours (2018) Assessing body condition of moose killed by gray wolves in southern Manitoba (co-supervised with V Harriman)
Taylor Naaykens, BSc Honours (2016) Grey wolf selection for moose calves and factors influencing prey species consumption in southeastern Manitoba
Shu ting Zhao, BSc Honours (2016) Arctic foxes subsidize other wildlife through ecosystem engineering on the Canadian tundra
Alyssa Eby, BSc Honours (2015) Temporal variation of isotopic niche breadth and overlap between arctic foxes and red foxes at the edge of the Arctic
Paul Faford, BSc Honours (2015) Arctic foxes engineer the beach ridge plant community through nutrient deposition in the Canadian subarctic
Arielle Nagy, BSc Honours (2015) Effects of elk management on wolf diets in Riding Mountain National Park
Tera Edkins, BSc Honours (2014) The effects of a pulsed resource on the dietary niche of a seed predator and the consumption of alternative prey