A5076143328- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Geology and Paleoclimatology Research
- Soil and Water Nutrient Dynamics
- Groundwater and Isotope Geochemistry
- Marine and coastal ecosystems
- Diatoms and Algae Research
- Marine Biology and Ecology Research
- Environmental Toxicology and Ecotoxicology
- Marine Sponges and Natural Products
- Integrated Water Resources Management
- Isotope Analysis in Ecology
- Coral and Marine Ecosystems Studies
- Coastal and Marine Dynamics
- Karst Systems and Hydrogeology
- Coastal wetland ecosystem dynamics
- Toxic Organic Pollutants Impact
- Smart Materials for Construction
- Heavy metals in environment
- Bryophyte Studies and Records
- Hydrology and Sediment Transport Processes
- Electrospun Nanofibers in Biomedical Applications
- Mine drainage and remediation techniques
Lake Simcoe Region Conservation Authority
2010-2023
Amita Health
2020
St. Joseph Hospital
2020
Trinity Hospital of Augusta
2020
Secant Group (United States)
2020
Queen's University
2007-2015
Ministry of the Environment, Conservation and Parks
2008
Fisheries and Oceans Canada
2008
Environment and Climate Change Canada
2008
York University
2008
Calcium concentrations are now commonly declining in softwater boreal lakes. Although the mechanisms leading to these declines generally well known, consequences for aquatic biota have not yet been reported. By examining crustacean zooplankton remains preserved lake sediment cores, we document near extirpations of calcium-rich Daphnia species, which keystone herbivores pelagic food webs, concurrent with lake-water calcium. A large proportion (62%, 47 81% by region) Canadian Shield lakes...
ABSTRACT Aim (1) To resolve theoretical debates regarding the role of environment versus dispersal limitation, conservatism niches across distances and prevalence environmental specialists in diatom communities. (2) provide guidance on use communities other microbial analogues to analyse ecological response change. Location Eight hundred ninety‐one lakes five regional datasets from north‐western Europe four north‐eastern North America. Methods Lacustrine were analysed at three scales:...
This study evaluated phosphorus (P) and iron (Fe) release from anoxic sediment cores in 3 different water bodies, Lake Winnipeg Manitoba Simcoe Hamilton Harbour Ontario, developed empirical models to predict P Fe rates as functions of chemistry. Maximum rates, which occurred shortly after sulfate (SO4) was depleted most cores, showed unique positive linear relationships for each lake. High only sediments with molar ratios =8.1 NaOH-extractable aluminum (Al) reducible (Fe extractable...
Lake Simcoe, the largest lake in southern Ontario outside of Laurentian Great Lakes, is affected by numerous stressors including eutrophication resulting from total phosphorus (TP) loading, climate change, and invasions exotic species. We synthesized long-term responses Simcoe to these assessing trends water quality biological composition over multiple trophic levels. Evidence for change included increasing thermal stability changes subfossil diatom communities time. Although deep dissolved...
Summary This study examined the effect of invasive dreissenid mussels on nutrient and carbon dynamics in a large lake (Lake Simcoe, Ontario). We measured rates (phosphorus nitrogen) excretion biodeposition by zebra quagga P, N C content their soft tissues shells at different depths throughout open‐water season. Measurements were combined with detailed information about biomass lakewide distribution to examine impacts dreissenids whole‐lake C. Mussel tissue biodepositon varied among species,...
Abstract Exchange of water between conduits and matrix is an important control on regional chemical compositions, karstification, quality ground resources in karst aquifers. A sinking stream (Santa Fe River Sink) its resurgence (River Rise) the unconfined portion Floridan Aquifer provide opportunity to monitor conduit inflow outflow. The use temperature as a tracer allows determination residence times velocities through system. Based records from two high events, flow reasonably represented...
Diatom-based paleolimnological techniques were used to reconstruct lake acidification trends in 51 low-alkalinity Nova Scotia lakes that spanned gradients of dissolved organic carbon (DOC) concentrations and sulphate deposition. Pre-industrial, diatom-inferred pH values these <6.8, with 31 having pre-industrial < 6.0 two 5.5. Lakes Kejimkujik National Park documented the greatest decline (–0.4 unit (±0.2)) since 19th century, whereas those northern parts province (e.g., Cape Breton...
The relationships between diatom assemblages and important limnological variables were investigated in 494 lakes from northeastern North America (Pennsylvania, USA, to Nova Scotia, Canada). variable most significantly related was lake water pH, although dissolved organic carbon nutrients also important. Based on these strong relationships, highly significant diatom‐based inference models developed reconstruct key based using weighted averaging (WA), maximum likelihood (ML), modern analogs...
Ginn BK, Dias EFS, Fleischaker T. 2021. Trends in submersed aquatic plant communities a large, inland lake: impacts of an invasion by starry stonewort (Nitellopsis obtusa). Lake Reserv Manage. 37:199–213. Aquatic and macroalgae (collectively, macrophyte) from Simcoe (Ontario, Canada) were studied lakewide, >200 site surveys 2008, 2013, 2018. Over this period, mean macrophyte biomass increased 5-fold, 29.9 g (dry)/m2 2008 to 153.9 2018, due the arrival expansion invasive First recorded 2009,...
Freshwater lakes in the Canadian Maritime provinces have been detrimentally influenced by multiple, often synergistic, anthropogenically-sourced environmental stressors. These include surface-water acidification (and a subsequent decrease calcium loading to lakes); increased nutrient inputs; watershed development; invasive species; and climate change. While detailed studies of these stressors are hindered lack predisturbance monitoring information; many cases, missing data can be determined...
To determine pre-disturbance limnological conditions, evaluate the impact of environmental stressors (surface water acidification, nutrient inputs, climate change, and winter deicing salt), set realistic recovery targets for lake management strategies, a rapid assessment paleolimnological approach was used to amount (and likely causes) changes over past ∼100–150 years in 51 urban lakes from Halifax, Nova Scotia (Canada). Diatom assemblages sediment cores were with "top" (recently deposited,...
Abstract Pockwock Lake, the drinking water supply for city of Halifax (Nova Scotia, Canada), has been impacted by deposition strongly acidic anions. Because long-term monitoring data are lacking, we used diatom-based paleolimnological techniques to track changes in quality variables this important source. Similar other acidified lakes region, Lake undergone diatom assemblages starting ~1940 with a corresponding lakewater pH decrease 1.2 units. Before ~1940, had diatom-inferred ~6.3 and...
Abstract Atlantic whitefish ( Coregonus huntsmani ) is a critically endangered species whose remaining habitat restricted to three lakes near Bridgewater, Nova Scotia, Canada. Other in this region have been affected by variety of environmental changes over the past 150 years (e.g. acidic deposition, eutrophication, and climatic changes); however, extent impact on these lakes, how current limnological conditions compare with pre‐industrial conditions, not known. Given lack long‐term...
Abstract Paleolimnological approaches using sedimentary diatom assemblages were used to assess water quality changes over the last approximately 200 years in three lakes from King's County, Nova Scotia. In particular, role of recent shoreline development accelerating eutrophication these systems was assessed. Sediment cores collected each lake analyzed for their at 5-year intervals, as determined by 210Pb dating. Analyses showed that system has changed, but tracked different ecosystem...