A5010994026- Aquatic Ecosystems and Phytoplankton Dynamics
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Soil and Water Nutrient Dynamics
- Marine Biology and Ecology Research
- Fish Ecology and Management Studies
- Paleontology and Stratigraphy of Fossils
- Isotope Analysis in Ecology
- Geological formations and processes
- Ocean Acidification Effects and Responses
- Tree-ring climate responses
- Coastal and Marine Management
- Water Quality and Pollution Assessment
- Diatoms and Algae Research
- Marine and fisheries research
- Ecology and Vegetation Dynamics Studies
- Doctoral Education Challenges and Solutions
- Groundwater and Isotope Geochemistry
- Climate change and permafrost
- Freshwater macroinvertebrate diversity and ecology
- Cephalopods and Marine Biology
- Health and Medical Research Impacts
- Geochemistry and Elemental Analysis
- Coral and Marine Ecosystems Studies
- Plant Diversity and Evolution
University of Regina
2021-2024
Queen's University
2017-2023
Western University
2016-2017
Brandon University
2016
A severe mental health crisis lurks in academia. Academics at all career stages (e.g., students, postdocs, faculty) have expressed high levels of stress, anxiety, depression, and other negative outcomes due to their careers (Woolston 2020; Nicholls et al. 2022). Factors including job financial insecurity, expectations productivity performance, poor work-life balance, extreme competition, toxic power dynamics, lack support been shown be the main sources among academics (Fig. 1; Woolston...
Despite decades of research and management efforts, eutrophication remains a persistent threat to inland waters. As nutrient pollution intensifies in the coming decades, implications for aquatic greenhouse gas (GHG) emissions are poorly defined, particularly responses individual GHGs: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O). The biogeochemical controls each can differ, making it difficult predict overall effect on net radiative forcing ecosystems. Here, we induced small...
Early Eocene fossil floras from British Columbia are a rich resource for reconstructing western North American early Cenozoic climate. The best known of these reflect cooler (MAT ≤ 15 °C) upland forest communities in contrast to coeval ≥ 18 forests lowland sites. Of particular interest is whether climates were monsoonal (highly seasonal precipitation). McAbee site 52.9 ± 0.83 Ma 0.5 km outcrop bedded lacustrine shale interbedded with volcanic ash. In this report two historical megaflora...
Diatom and chrysophyte assemblages from varved sediments of meromictic Crawford Lake, Ontario record major environmental changes resulting spatially broadening anthropogenic stressors related to the “Great Acceleration” in mid-20th century. Biannual assessment diatom over last ~200 years allowed for rate change analysis between adjacent samples that increased substantially during century, concurrent with significant generalized additive model trends. Changes were likely driven by multiple...
Abstract Hydrologic management of shallow lakes is often undertaken to prevent fluctuations in lake level, and ensure sufficient water volume for economic, domestic, recreational uses, but there inconsistent evidence whether lake‐level stabilisation through hydrological promotes or hinders eutrophication. Here we used multi‐proxy paleolimnological assessments quality (sedimentary carbon, nitrogen, total phosphorus, fossil pigments), zooplankton community ecology (fossil Cladocera...
Abstract Climate‐induced variation in lake level can affect physicochemical properties of endorheic lakes, but its consequences for phototrophic production and regime shifts are not well understood. Here, we quantified changes the abundance community composition phototrophs Kenosee White Bear two basins parkland Moose Mountain uplands southeastern Saskatchewan, Canada, which have experienced > 8 m declines water since ~ 1900. We hypothesized that lower levels warmer temperatures should...
Historical changes in Holocene climate northeastern Ontario were quantified using analyses of sedimentary pollen, diatoms, and pigments a small boreal lake. Modern analog reconstructions average temperature from pollen assemblages Charland Lake showed was ~2°C warmer than present conditions ~7800–4500 cal. yr BP, time period consistent with the thermal maximum (HTM). Pollen data suggest two-phase HTM: warm dry based on presence primarily Pinus spp., followed by wet increases cedar. Overall,...
Abstract Evaluation of large lake response to centennial changes in land use and climate can be complicated by high spatial hydrological complexity within their catchments, particularly regions low relief. Furthermore, lakes exhibit abrupt structure function that obscure causes eutrophication. We provide the first quantification historical trends production, cyanobacterial abundance, sediment geochemistry diatom composition since c. 1800 Lake Manitoba, 29th largest world, compared them...
Descriptions of regional climate expression require data from multiple lakes, yet little is known how variation in records within morphometrically complex lakes may affect interpretations. In northeast Ontario (Canada), this issue was addressed using pollen, pigments, and diatoms three sediment cores two small boreal spanning the last ~6000 years. Pollen analysis suggested warm conditions between ~4000 cal yr BP, coherent with previous assessments eastern western Quebec. Analysis...
Abstract Phytobenthos are often underrepresented in both limnological and paleolimnological studies but may play key roles whole‐lake production ecosystem processes including eutrophication, food‐web dynamics, state changes. Photosynthetic pigments, stables isotopes, diatoms were quantified from surface sediments (0–1 cm) collected across a depth transect of small, DOC‐rich, mesotrophic lake boreal northwestern Ontario to assess spatial variation phytobenthos abundance production. Maximal...
Pentameroides is a large-shelled pentameride brachiopod, which was widespread throughout Laurentia in the early Silurian (Telychian). Evolving from Pentamerus Telychian, it dispersed its subtropical – high tropical origin to subequatorial intracratonic seas by late Llandovery. In this study, large collections of reef-dwelling septentrionalis Attawapiskat Formation, Akimiski Island, Nunavut, and level-bottom-inhabiting subrectus Fossil Hill Manitoulin Ontario, Jupiter Anticosti Quebec, were...
Abstract Pollen and diatom assemblages from well-dated sediment cores three lakes forming a west-to-east transect across the boreal forest in northwest Ontario (Canada) were used to evaluate timing nature of movement prairie–forest ecotone (PFE) Holocene. Changes vegetation, temperature, effective moisture inferred pollen pollen-based transfer functions. Analyses indicated site-specific vegetational climate changes short spatial distances, with prolonged prairie-like conditions during middle...
Laird KR, Li S, Gushulak CAC, Moir KE, Wang Y, Leavitt PR, Cumming BF. 2023. Influence of cultural eutrophication, climate, and landscape connectivity on 3 Kawartha lakes (Ontario, Canada) since the early 1800s . Lake Reserv Manage. XX:XXX–XXX.Paleolimnological analyses within Trent-Severn Waterway (TSW) were examined to evaluate role regional land-use practices (forestry agriculture), climate change, position eutrophication lake response over past ∼200 yr. The selected represent along chain...