A5052702467- Climate change and permafrost
- Geology and Paleoclimatology Research
- Peatlands and Wetlands Ecology
- Aquatic Invertebrate Ecology and Behavior
- Isotope Analysis in Ecology
- Arctic and Antarctic ice dynamics
- Fish Ecology and Management Studies
- Cryospheric studies and observations
- Indigenous Studies and Ecology
- Avian ecology and behavior
- Aquatic Ecosystems and Phytoplankton Dynamics
- Karst Systems and Hydrogeology
- Soil erosion and sediment transport
- Marine Biology and Ecology Research
- Ecology and biodiversity studies
- Groundwater and Isotope Geochemistry
- Marine and coastal ecosystems
- Coastal wetland ecosystem dynamics
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
York University
2022-2025
Queen's University
2015-2016
Abstract Ponds are often identified by their small size and shallow depths, but the lack of a universal evidence-based definition hampers science weakens legal protection. Here, we compile existing pond definitions, compare ecosystem metrics (e.g., metabolism, nutrient concentrations, gas fluxes) among ponds, wetlands, lakes, propose an definition. Compiled definitions mentioned surface area depth, were largely qualitative variable. Government legislation rarely defined despite commonly...
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...
Lake browning has been widely projected for northern lakes affected by permafrost thaw, but the inherent heterogeneity in landscapes coupled with a paucity of data many regions makes it challenging to develop circumpolar-scale assessments. This was evident our analysis surface water chemistry 51 small, shallow (0.5-3 m) discontinuous peatlands Taiga Plains (Northwest Territories, Canada), which were distributed across three Level IV ecoregions (Cameron Uplands, South Mackenzie Plain,...
Tathlina Lake (Northwest Territories, Canada) is a large, shallow ecosystem in the rapidly warming northern boreal forest. This lake of considerable cultural and economic significance as it supports commercially important walleye (Sander vitreus) fishery that has experienced large fluctuations since 1940s, causes which are poorly understood. Here we used paleolimnology to describe long-term environmental changes may have contributed recent collapses populations. The sub-fossil remains...
Lakes in discontinuous permafrost peatlands are on the front lines of climate change, sensitive to even modest increases air temperature. The aim this study was provide first limnological characterization shallow (∼1–2 m depth) lakes Scotty Creek basin (Northwest Territories, Canada), a field site circumpolar significance due existence long-term ecohydrological monitoring going back decades. We use previous work as foundation advance our process-based understanding potential drivers lake...
Geographic context matters when trying to understand how permafrost thaw impacts northern freshwater biodiversity in a warming climate. Most risk fresh water from thawing is associated with abrupt processes known as thermokarst. Lake sediments can provide record of thermokarst landscape development and biogeochemical trends over long timescales, providing tool link geomorphology biodiversity. We describe paleolimnology, its inherent emphasis on long-term perspectives, characterize the...
The Tuktoyaktuk coastlands contain thousands of lakes along an area the Beaufort Sea in rapidly changing western Arctic. These may be susceptible to a range impacts associated with climate warming, including potential increased marine influence changes reduced lake ice cover and thawing permafrost. We examined 210 Pb-dated sediment core from Iqallukvik Lake reconstruct ecosystem over last several hundred years using particle size analysis diatom subfossils. Changes texture past ∼200 were...