A persistent issue of zebra mussels, microplastics from wastewater, ongoing E. coli concerns, and toxic algal blooms visible from space have plagued Lake Winnipeg, becoming familiar and unwelcome challenges for Manitobans. Amidst these well-known problems lies a lesser-discussed aspect that is gaining attention in efforts to understand the future well-being of one of the largest freshwater basins in our increasingly warm world.
Professor Emily Chase, an accomplished microbiologist and virologist at the University of Winnipeg, highlights the often overlooked role of viruses, particularly those infecting microalgae, in the ecosystem of Lake Winnipeg. Last summer, Chase embarked on groundbreaking research to investigate how viruses impact Lake Winnipeg’s microalgae, the tiny photosynthetic organisms notorious for forming a scummy blue-green film containing harmful neuro-toxins.
Despite their negative reputation, microalgae play a crucial part in Lake Winnipeg’s food chain by harnessing solar energy, becoming a vital source of nutrition for filter feeders, spineless creatures, minnows, and larger fish like walleye. However, concerns loom over climate change exacerbating the already fragile Lake Winnipeg ecosystem, potentially leading to more frequent and severe toxic algal blooms, disrupting various activities such as swimming, fishing, and tourism.
Chase emphasizes the significance of understanding viruses in the context of climate change to predict and manage future lake conditions. By studying virus interactions with microalgae blooms, researchers hope to anticipate bloom collapses and restore the water’s safety for recreational use and environmental balance. Drawing from her expertise gained through extensive research in the Mediterranean Sea and the U.S., Chase is now focusing on Lake Winnipeg, recognizing parallels with Lake Erie’s environmental challenges as a warning for potential future scenarios.
The impact of phosphorus and nitrogen from agricultural runoff and wastewater on toxic algal blooms is well-documented, contributing to Lake Winnipeg’s reputation as one of the most threatened lakes globally. While the role of viruses in shaping broader lake dynamics remains less understood, ongoing research suggests their involvement in algal bloom collapses. Insights from this research could provide valuable information to model climate change effects and potential outcomes for Lake Winnipeg, offering critical knowledge for future conservation efforts.