Chris Pressey, Author at RAEON

Tracking more than 30 years of phytoplankton blooms in Lake Winnipeg

Lake Winnipeg —one of North America’s Great Lakes — recently has been labeled one of the most threatened lakes in the world because of increased phytoplankton productivity. Many stressors are triggering these alterations in phytoplankton productivity, including climate change. But to separate climate change from natural variability is challenging and requires a large data set with more than three decades of continuous phytoplankton data.…

Intensive agricultural lands feed into Canada’s Great Lakes. The primary type of nitrogen used in agriculture has changed over time, shifting from organic to inorganic forms, such as urea. This change has corresponded with an increase in the frequency, magnitude, and duration of phytoplankton blooms, including cyanobacteria that are known to produce toxins harmful to life.…

Cyanobacteria, algae that form on the surface of nutrient-rich waters, can produce an array of toxins. Accurately measuring these toxins in waterbodies is crucial because they can pose risks to human health and other biological communities. Unfortunately, monitoring and research of these toxins has focused almost exclusively on one particular compound—microcystins.…

Atlantic salmon were historically abundant in Lake Ontario, but their populations disappeared from the lake more than a century ago. Management agencies and conservation groups have made restoring Atlantic salmon in Lake Ontario a top priority. This project will investigate two key factors that may affect the success of these programs – a high thiamine diet from exotic prey species and warming water temperatures due to climate change.…

Evaluating Microbial Nutrient Sediment Dynamics in Lake Erie Watersheds

Lake Erie

A primary goal of water quality managers is to intercept or mitigate nutrients or pathogens at their source to ensure effective wastewater treatment. Source water treatment includes building onsite treatment systems and implementing agricultural best practice for crops. To ensure mitigation is working, managers often monitor nutrients and pathogens in water.…

Investigating Fish Connectivity in the Rideau Canal Waterway to Inform Conservation Decisions

Rideau Canal Waterway

By: Jordanna N. Bergman, PhD Student, Carleton University and Steven J. Cooke, Professor, Carleton University The Rideau Canal Waterway, located in eastern Ontario, forms a continuous 202-km route between Lake Ontario and the Ottawa River and is connected by 23 working lockstations.…

Evaluating stationary hydroacoustics for determining fish movement and abundance

Lake Superior

Little is known about the large-scale movement patterns of Great Lakes fishes. Though it is understood that large migrations of fish typically occur along regions of Lake Superior during spawning events, the timing and potential drivers of these events are not well understood. Better understanding the timing and drivers of these events is important for more effective management of these fisheries. ...

Black Bay Walleye Acoustic Telemetry

Lake Superior

Located on the north shore of Lake Superior, Black Bay historically supported a robust commercial and recreational fishery for walleye (Sander vitreus). Unfortunately, the walleye population rapidly declined in the 1960s because of a combination of habitat loss and commercial over-fishing. In response, managers closed the fishery in the northern part of Black Bay to allow the population to recover. ...

Harmful algal blooms (HABs) and the low dissolved oxygen concentrations associated with them are a growing concern for large water bodies throughout the world. HABs have resulted in fish kills and drinking water advisories, which collectively have caused estimated economic losses of up to US$71 million per year within Lake Erie alone.…

Using the REASON (River Environment And Sensor Observation Network) Project to Support Adaptive Management of the Saint Lawrence River

St. Lawrence River

A regional water problem is the paucity of data to support policy decisions on water quality in the International Section of the St. Lawrence River. One cost-effective method to alleviate this information gap is to use remote continuous observation water quality sensor arrays. A novel application that we have developed is the installation of sensor arrays in a hydropower dam wherein ...

Chris Pressey

Tracking more than 30 years of phytoplankton blooms in Lake Winnipeg

The effect of different nitrogenous compounds on cyanobacteria physiology and toxin production

Understanding the distribution and presence of different cyanotoxins in Ontario waters

Atlantic salmon restoration in Lake Ontario

Evaluating Microbial Nutrient Sediment Dynamics in Lake Erie Watersheds

Investigating Fish Connectivity in the Rideau Canal Waterway to Inform Conservation Decisions

Evaluating stationary hydroacoustics for determining fish movement and abundance

Black Bay Walleye Acoustic Telemetry

GETTING REAL: REAL-TIME TECHNOLOGY PROVIDES GREATER INSIGHT ON WATER QUALITY ISSUES

Using the REASON (River Environment And Sensor Observation Network) Project to Support Adaptive Management of the Saint Lawrence River

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