A5078137504- Fish Ecology and Management Studies
- Marine and fisheries research
- Isotope Analysis in Ecology
- Marine Bivalve and Aquaculture Studies
- Aquaculture Nutrition and Growth
- Greenhouse Technology and Climate Control
- Marine animal studies overview
- Wildlife Ecology and Conservation
- Environmental DNA in Biodiversity Studies
- Mercury impact and mitigation studies
- Marine and coastal ecosystems
- Radioactive contamination and transfer
- Plant responses to elevated CO2
- Ecology and biodiversity studies
- Environmental Toxicology and Ecotoxicology
- Plant Water Relations and Carbon Dynamics
- Hydrology and Sediment Transport Processes
- Physiological and biochemical adaptations
- Genetic diversity and population structure
- Fish Biology and Ecology Studies
- Oceanographic and Atmospheric Processes
- Light effects on plants
- Plant Physiology and Cultivation Studies
- Identification and Quantification in Food
- Water Quality and Resources Studies
Fisheries and Oceans Canada
2015-2024
University of New Brunswick
2023
Government of Canada
2022
Huntsman Marine Science Centre
2020
University of Victoria
2009-2019
Vancouver Island University
2014
McGill University
1997-2001
Université de Montréal
1996
Université Laval
1971-1991
Cornell University
1970-1971
Abstract Emerging diseases are impacting animals under high‐density culture, yet few studies assess their importance to wild populations. Microparasites selected for enhanced virulence in culture settings should be less successful maintaining infectivity populations, as once the host dies, there limited opportunities infect new individuals. Instead, moderately virulent microparasites persisting long periods across multiple environments of greatest concern. Evolved resistance endemic may...
Mass balance models can be used to predict mercury accumulation in fish. However, factors influencing elimination, an essential parameter of the mass model, are poorly understood. We developed a general model elimination from fish using literature data. Our analysis showed that short-term experiments (<90 days) overestimated rate and inorganic was excreted 3-fold faster than methylmercury. Both methylmercury excretion were negatively correlated body size, but only significantly water...
The concentration of mercury in fish generally increases with age and size. Although a number hypotheses have been invoked to explain this pattern, our understanding the processes regulating accumulation is currently inadequate. In study, we used simple mass balance model explore how relationship between affected by bioenergetics prey contamination. We show that when older consume more contaminated or metabolic costs associated activity also increase Our analyses further indicate relative...
Lycopersicon esculentum Mill. cv Vedettos and chmielewskii Rick, LA 1028, were exposed to two CO(2) concentrations (330 or 900 microliters per liter) for 10 weeks. Tomato plants grown at liter contained more starch sugars than the control. However, we found no significant accumulation of in young leaves L. high CO(2). Carbon exchange rates significantly higher CO(2)-enriched first few weeks treatment but thereafter decreased as tomato acclimated atmospheric This indicates that long-term...
Although the California Current has undergone substantial environmental shifts in past few decades, summer of 2005 exhibited highly anomalous conditions relative to all previous recorded summers terms late initiation upwelling and resulting elevated surface temperatures depressed productivity through July. The response pelagic nekton these was widespread included onshore poleward displacement taxa new geographic areas, population changes within normal range, reduced early life stages based...
Abstract The effects of ocean conditions on highly migratory species such as salmon are difficult to assess owing the diversity environments they encounter during their marine life. In this study, we reconstructed initial migration routes juvenile Chinook Oncorhynchus tshawytscha originating from Oregon Southeast Alaska using coded wire tag recovery data Canadian Department Fisheries and Oceans National Marine Service research surveys conducted between 1995 2006. Over 12‐year period, 1,862...
Selection of prey that are small and in poor body condition is a widespread phenomenon terrestrial predator-prey systems may benefit populations by removing substandard individuals. Similar selection widely assumed to operate aquatic systems. Indeed, size-selective predation longstanding central tenet food web theory. However, it not known if predators select based on their or state, compared size. Surprisingly, no comparable information available for marine because exceedingly difficult...
Abstract Understanding the factors contributing to declining smolt‐to‐adult survival (hereafter “smolt survival”) of Coho Salmon Oncorhynchus kisutch originating in Salish Sea southwestern British Columbia and Washington State is a high priority for fish management agencies. Uncertainty regarding relative importance mortality operating at different spatial scales hinders prioritization science activities. We therefore examined temporal coherence smolt survivals based on decision tree...
The integration of environmental DNA (eDNA) within management strategies for lotic organisms requires translating eDNA detection and quantification data into inferences the locations abundances target species. Understanding how is distributed in space time complex environments rivers streams a major factor achieving this translation. Here we study bidimensional signals to predict position abundance Atlantic salmon ( Salmo salar ) juveniles. We use from sentinel cages with range (3–63...
Sympatric populations of dwarf lake whitefish (Coregonus clupeaformis) (DLW) and normal (NLW) commonly occur in north temperate subarctic lakes. DLW have a much lower growth, mature earlier, shorter life span than NLW. Furthermore, they are usually not found when cisco artedi) present, possibly due to competitive exclusion. In this study, we compared the energy budget DLW, NLW, using food consumption rates estimated with mass balance models chemical tracers (i.e., mercury radiocesium). These...
In this study, we compared energy budgets of lake trout (Salvelinus namaycush) populations in contrasting food webs. Nonpiscivorous (NPLT) reached a much smaller size and grew at slower rate than piscivorous (PLT) populations. Food consumption rates were, on average, 23 times higher NPLT when they were expressed wet weight basis. However, only slight (less 10%) difference their intake was detected once corrected for differences prey caloric content. Growth efficiency approximately two lower...
Abstract Bioenergetic models frequently rely on published values or for estimating the energy density of fish, principally because cost and effort obtaining direct measurements. In this study, we developed empirical free-ranging juvenile coho salmon Oncorhynchus kisutch Chinook O. tshawytscha sampled at sea from west coast Oregon to Kodiak Island, Alaska, evaluated accuracy commonly used these species. Our analyses showed that was strongly correlated percent dry weight proximate constituents...
Lycopersicon esculentum Mill. cv Vedettos and chmielewskii Rick, LA 1028, were exposed to two CO(2) concentrations (330 or 900 microliters per liter) for 10 weeks. The elevated increased the initial ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity of both species first 5 weeks treatment but difference did not persist during last Mg(2+)-CO(2)-activated Rubisco was higher in liter 2 declined sharply thereafter. After weeks, leaves grown at 330 had about twice compared with...
Abstract Knowledge of the migratory habits juvenile Pacific salmon Oncorhynchus spp. is required to test hypothesis that ocean food resources are a limiting factor in their production. Using DNA stock identification techniques, we reconstructed regional and seasonal changes composition sockeye O. nerka ( n = 4,062) collected from coastal Washington Alaska Peninsula trawl surveys May February 1996–2007. Individuals were allocated 14 populations. The majority stocks Fraser River system (42%),...
Abstract In spite of a relatively optimistic pre‐season forecast, the total return adult sockeye salmon ( Oncorhynchus nerka ) to Fraser River (British Columbia, Canada) in 2009 was lowest recorded since quantitative records began late 1940s. A plausible mechanism is proposed that links sequence extreme oceanic and climatic events poor marine survival. It with record‐setting snow packs coastal mountain range during winter 2007 led development unprecedented oceanographic conditions spring...
Mass balance models have frequently been used with laboratory-derived bioenergetic to examine the accumulation of mercury (Hg) in fish. The Hg fish has usually successfully described by these models. However, this generally achieved adjusting parameters until there was a close fit between observed and predicted values. In study, we present simple mass model (MMBM) predict concentration This MMBM applied three methods estimating food consumption rates freshwater species. accurately species...
Abstract Farley, E. V., Starovoytov, A., Naydenko, S., Heintz, R., Trudel, M., Guthrie, C., Eisner, L., Guyon, J. R. 2011. Implications of a warming eastern Bering Sea for Bristol Bay sockeye salmon. – ICES Journal Marine Science, 68: 1138–1146. Overwinter survival Pacific salmon (Oncorhynchus sp.) is believed to be function size and energetic status they gain during their first summer at sea. We test this notion (O. nerka), utilizing data from large-scale fisheries oceanographic surveys...
Abstract Tomato plants were grown in sand culture at 8 levels of K ranging from 0 to 10 meq per liter nutrient solution. Fully ripened fruit picked and rated internally externally for abnormal pigmentation. Total carotenoids analyzed the extract fractionated into 3 groups: hydrocarbon, monohydroxy polyhydroxy. The hydrocarbon fraction was further separated chromatographically 6 individual pigments. Most carotenoids, lycopene particular, generally increased with increasing concn. A notable...
Abstract The ocean feeding grounds of juvenile Pacific salmon Oncorhynchus spp. range over several thousand kilometers in which conditions, prey quality and abundance, predator assemblages vary greatly. Therefore, the fate individual stocks may depend on where they migrate how much time spend different regions. Juvenile ( n = 6,266) immature 659) Chinook tshawytscha were collected from coastal Washington to Southeast Alaska trawl surveys February November 1998–2008, allowed us reconstruct...
Abstract Record low returns of sockeye salmon Oncorhynchus nerka to the Fraser River in 2009 were followed by record high river 2010, providing an unprecedented opportunity examine links between oceanic factors and survival Pacific stocks. The indicated poor early marine juvenile 2007. was likely due food levels arising from unfavorable wind runoff conditions Strait Georgia Queen Charlotte Sound–Hecate region spring Conversely, 2010 associated with a large smolt output good 2008. This...