A5073757540- Geology and Paleoclimatology Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Climate change and permafrost
- Marine and coastal ecosystems
- Toxic Organic Pollutants Impact
- Heavy metals in environment
- Marine Biology and Ecology Research
- Fish Ecology and Management Studies
- Geochemistry and Geologic Mapping
- Mercury impact and mitigation studies
- Isotope Analysis in Ecology
- Mine drainage and remediation techniques
- Arctic and Antarctic ice dynamics
- Petroleum Processing and Analysis
- Aquatic Ecosystems and Biodiversity
- Cryospheric studies and observations
- Peatlands and Wetlands Ecology
- Atmospheric and Environmental Gas Dynamics
- Coastal wetland ecosystem dynamics
- Environmental Toxicology and Ecotoxicology
- Tree-ring climate responses
- Fire effects on ecosystems
- Indigenous Studies and Ecology
- Marine and coastal plant biology
York University
2016-2025
University of Ottawa
2013-2018
Queen's University
2008-2015
Wilfrid Laurier University
2014
Ministry of the Environment, Conservation and Parks
2010
Widespread across northern permafrost landscapes, thermokarst ponds and lakes provide vital wildlife habitat play a key role in biogeochemical processes. Stored the sediments of these typically shallow dynamic waterbodies are rich sources paleoenvironmental information whose potential has not yet been fully exploited, likely because concerns over stratigraphic preservation challenges to develop reliable sediment core chronologies. Here, we present an overview recently derived informative...
Giant Mine, located in the city of Yellowknife (Northwest Territories, Canada), is a dramatic example subarctic legacy contamination from mining activities, with remediation costs projected to exceed $1 billion. Operational between 1948 and 2004, gold extraction at Mine released large quantities arsenic metals roasting arsenopyrite ore. We examined long-term ecological effects roaster emissions on Pocket Lake, small lake edge lease boundary, using spectrum palaeoenvironmental approaches. A...
Calcium (Ca) concentrations are decreasing in softwater lakes across eastern North America and western Europe. Using long-term contemporary palaeo-environmental field data, we show that this is precipitating a dramatic change Canadian lakes: the replacement of previously dominant pelagic herbivores (Ca-rich Daphnia species) by Holopedium glacialis, jelly-clad, Ca-poor competitor. In some lakes, transformation being facilitated increases macro-invertebrate predation, both from native...
This air synthesis review presents the current state of knowledge on sources, fates, and effects for polycyclic aromatic compounds (PACs) related chemicals released to in oil sands region (OSR) Alberta, Canada. Through implementation Joint Canada–Alberta Oil Sands Monitoring Program 2012 a vast amount new information PACs has been acquired through directed monitoring research projects reported scientific community public. addresses questions cumulative informs sustainable management resource...
Many proteins depend on metals for proper functioning, yet there is little information the distribution of low metal concentrations in freshwaters nor what constitutes ‘low’. Eight dissolved were surveyed 2017 39 lakes and reservoirs across Canada. RDA analysis revealed Co, Cu, Ni V one group with higher Prairies Fe Mn a second Boreal Shield Ontario. Zn Mo lacked geographic patterns. Concentrations ranged several fold. Monod growth kinetic parameters explored their potential to infer...
Increased algal blooms are a threat to aquatic ecosystems worldwide, although the combined effects of multiple stressors make it difficult determine underlying causes. We explore whether changes in trophic interactions response declining calcium (Ca) concentrations, water quality issue only recently recognized Europe and North America, can be linked with unexplained bloom production. Using palaeolimnological approach analysing remains Cladocera (herbivorous grazers) visual reflectance...
The development of effective risk reduction strategies for aquatic pollutants requires a comprehensive understanding toxic impacts on ecosystems. Classical toxicological studies are characterizing pollutant biota in controlled, simplified environment. Nonetheless, it is well-acknowledged that predictions based the results these must be tested over long-term natural ecosystem setting to account increased complexity and multiple stressors. Paleolimnology (the study lake sediment cores...
Daphnia and Bosmina fragments were identified measured in the surface sediments of 42 lakes Muskoka-Haliburton region Ontario, Canada, an attempt to identify environmental factors that may influence cladoceran body size. Specifically, pecten length on post-abdominal claws, antennule headshields, carapace mucro lengths carapaces measured. These measurements then compared limnological variables previously as possibly influencing size, including dissolved organic carbon (DOC), total phosphorus...
Abstract Aim Shifts in the distribution of freshwater algal communities as a result climate‐related limnological changes are well documented; however, impacts on higher trophic levels have received less attention. For example, little is known about how Cladocera (Crustacea, Branchiopoda), often dominant invertebrates and key ecological indicators, responded to recent warming broad spatial temporal scales. Here, we use lake sediment records test hypothesis that recent, intensive western...
Abstract Permafrost‐supported peatlands near the southern limit of permafrost are experiencing dramatic landscape changes as a result recent climate warming, which have potential to impact aquatic ecosystems through in terrestrial run‐off. Our objectives were determine how organic matter inputs Northwest Territories (Canada) changed peat subsidence, and whether can be linked sedimentary mercury. To accomplish this, we analyzed lipid biomarkers, lignin‐derived phenols, other geochemical...
Abstract Understanding the interaction between response of a complex ecosystem to climate change and protection vulnerable wildlife species is essential for conservation efforts. In Northwest Territories (Canada), recent movement Mackenzie wood bison herd ( Bison athabascae ) out their designated territory has been postulated as loss habitat following regional lake expansion. We show that proportion this landscape occupied by water doubled since 1986 timing expansion corresponds movements...
Understanding the long-term controls on cladoceran size structure has important implications for aquatic ecosystems. Although there been considerable interest in zooplankton trends Canadian Shield lakes, data are not available prior to period of anthropogenic disturbances. Here, we present pre- and post-impact common pelagic cladocerans Bosmina Daphnia 44 well-studied lakes south-central Ontario (Canada). We show that were larger length body appendages (mucrones antennules) was longer...