A5023718044- Parasite Biology and Host Interactions
- Fish Ecology and Management Studies
- Marine and fisheries research
- Wildlife Ecology and Conservation
- Helminth infection and control
- Identification and Quantification in Food
- Aquaculture disease management and microbiota
- Bird parasitology and diseases
- Genetic diversity and population structure
- Evolution and Genetic Dynamics
- Zoonotic diseases and public health
- Myxozoan Parasites in Aquatic Species
- Nematode management and characterization studies
- Water Quality and Resources Studies
- Indigenous Studies and Ecology
- Mollusks and Parasites Studies
- Evolutionary Game Theory and Cooperation
- Environmental DNA in Biodiversity Studies
- Parasites and Host Interactions
- Marine and coastal plant biology
- Economic and Environmental Valuation
- Ecology and Vegetation Dynamics Studies
- Fire effects on ecosystems
- Species Distribution and Climate Change
- Power Systems and Technologies
Vancouver Coastal Health
2019-2024
University of Toronto
2016-2024
Pacific Salmon Foundation
2023
University of Calgary
2017-2023
Fisheries and Oceans Canada
2012-2023
University of Alberta
2012-2019
BP (Canada)
2019
Occidental College
2016
Google (United States)
2015
Public Citizen
2013
The complexity of host-parasite interactions makes it difficult to predict how systems will respond climate change. In particular, host and parasite traits such as survival virulence may have distinct temperature dependencies that must be integrated into models disease dynamics. Using experimental data from Daphnia magna a microsporidian parasite, we fitted mechanistic model the within-host population Model parameters comprising aging mortality, well growth, virulence, equilibrium abundance,...
For some salmon populations, the individual and population effects of sea lice (Lepeophtheirus salmonis) transmission from cage farms is probably mediated by predation, which a primary natural source mortality juvenile salmon. We examined how infestation affects predation risk pink (Oncorhynchus gorbuscha) chum (O. keta) salmon, developed mathematical model to assess implications for dynamics conservation. A risk-taking experiment indicated that infected accept higher in order obtain...
Effective wildlife management requires accurate and timely information on conservation status trends, knowledge of the factors driving population change. Reliable monitoring health, including disease, body condition, trends demographics, is central to achieving this, but conventional scientific alone often not sufficient. Combining different approaches types can provide a more holistic understanding than science bridge gaps in remote sparsely populated areas. Inclusion traditional ecological...
Information on species’ phenology and distribution is essential for assessing mitigating exposure to pressures that vary over space time, such as development projects or climate changes. Pacific salmon (Oncorhynchus spp.) have complex life cycles span freshwater marine environments unfold several years many thousands of kilometers. Currently, there no central repository life-cycle timing steelhead populations throughout their Canadian range, hindering conservation recovery efforts. To fill...
The resilience of coastal social-ecological systems may depend on adaptive responses to aquaculture disease outbreaks that can threaten wild and farm fish. A nine-year study parasitic sea lice (Lepeophtheirus salmonis) pink salmon (Oncorhynchus gorbuscha) from Pacific Canada indicates changes in parasite management farms have yielded positive conservation outcomes. After four years epizootics population decline, parasiticide application was adapted the timing migrations. Winter treatment...
Conservation management of wild fish may include health in sympatric populations domesticated aquaculture. We developed a mathematical model for the population dynamics parasitic sea lice (Lepeophtheirus salmonis) on Atlantic salmon (Salmo salar) Broughton Archipelago region British Columbia. The was fit to seven-year dataset monthly louse counts farms area estimate growth rates relation abiotic factors (temperature and salinity), local host density (measured as cohort surface area), use...
Abstract Fire is a major disturbance driving the dynamics of world's savannas. Almost all fires are set by humans who increasingly altering fire timing and frequency on every continent. The largest protected areas savannas found in monsoonal northern Australia. These include relatively intact, tall, open forests where traditional indigenous regimes have been largely replaced past half century contemporary patterns with trees experiencing as often three out five years. Eucalypt canopy form...
The advent and growth of salmon farming has changed the epidemiology some diseases. In 2015, in salmon-farming region Broughton Archipelago, British Columbia, an outbreak native ectoparasitic copepods (sea lice; Lepeophtheirus salmonis) recurred wild juvenile after a decade effective control. We draw on 15-year data set sea lice farmed area to assess evidence for four factors that may explain recent outbreak: (i) poorly timed parasiticide treatments relative migration, (ii) evolution...
Muskoxen (Ovibos moschatus) are increasingly subject to multiple new stressors associated with unprecedented climate change and increased anthropogenic activities across much of their range. Hair may provide a measurement stress hormones (glucocorticoids) over periods weeks months. We developed reliable method quantify cortisol in the qiviut (wooly undercoat) muskoxen using liquid chromatography coupled tandem mass spectrometry. then applied this technique determine natural variability...
There is an increasing realization of the diverse mechanisms by which parasites and pathogens influence dynamics host populations communities. In multi‐host systems, may mediate food web with unexpected outcomes for populations. Models have been used to explore potential consequences interactions between hosts, predators, but connections theory data are rare. Here, we consider sea louse ( Lepeophtheirus salmonis ), directly increase mortality juvenile salmon hosts Oncorhynchus spp.). We use...
Climate change is affecting Arctic ecosystems, including parasites. Predicting outcomes for host–parasite systems challenging due to the complexity of multi-species interactions and numerous, interacting pathways by which climate can alter dynamics. Increasing temperatures may lead faster development free-living parasite stages but also higher mortality. Interactions between behavioural plasticity hosts parasites will influence transmission processes. We combined laboratory experiments...
The impact of parasites on hosts is invariably negative when considered in isolation, but may be complex and unexpected nature. For example, if make less desirable to predators then gains from reduced predation offset direct costs being parasitized. We explore these ideas the context sea louse infestations salmon. In Pacific Canada, lice can spread farmed salmon migrating juvenile wild Low numbers cause mortality pink chum salmon, this has resulted productivity river populations exposed...
Significance When animals migrate, they take their parasites with them—or not. Understanding infectious disease in migratory is challenging because the vast distances covered result variable host densities and infection pressure make it difficult to collect data. Empirical studies show that migrants may have higher, lower, or same intensity as residents. We present a model produces different patterns migration outcomes under parameters, laying theoretical foundation for exploring what be...
Across a species' range, populations are exposed to their local thermal environments, which on an evolutionary scale, may cause adaptative differences among populations. Helminths often have broad geographic ranges and temperature-sensitive life stages but little is known about whether how adaptation can influence response climate change. We studied the responses of free-living Marshallagia marshalli, parasitic nematode wild ungulates, along latitudinal gradient. first determine its...
Umingmakstrongylus pallikuukensis and Varestrongylus eleguneniensis are two potentially pathogenic lungworms of caribou muskoxen in the Canadian Arctic. These parasites currently undergoing northward range expansion at differential rates. It is hypothesized that their invasion spread to Arctic Archipelago part driven by climate warming. However, very little known regarding physiological ecology, limiting our ability parameterize ecological models test these hypotheses make meaningful...
A tension between cooperation and conflict characterizes the behavioral dynamics of many social species. The foraging benefits group living include increased efficiency reduced need for vigilance, but can also encourage theft captured prey from conspecifics. payoffs stealing others (scrounging) versus capturing (producing) may depend not only on frequency each strategy in an individual's ability to steal. By observing behavior juvenile coho salmon (Oncorhynchus kisutch), we found that,...
The distribution of individuals among populations and in space may contribute to their resilience under environmental variability. Changes indicate the loss genetically distinct subpopulations, deterioration habitat capacity, or both. Pacific salmon ( Oncorhynchus spp.) spawning locations has recently been recognized as an important component status assessment by USA Canadian management agencies, but metrics have not rigorously evaluated. We evaluated three four sampling designs for ability...
Migration can reduce parasite burdens in migratory hosts, but it connects populations and drive disease dynamics domestic species. Farmed salmon are infested by sea louse parasites, often carried wild salmonids, resulting a costly problem for industry risk to when farms amplify numbers. Chemical treatment control lice, resistance has evolved many salmon-farming regions. Resistance has, however, been slow evolve the north-east Pacific Ocean, where large wild-salmon harbour populations. Using...