Wildlife of
Manitoba

Primary Threats

• In southern Manitoba's prairie-parkland, conversion of native grasslands to annual cropland and associated wetland drainage reduce nesting and foraging habitat for grassland birds (e.g., Burrowing Owl, Sprague's Pipit) and diminish natural water storage that buffers floods and droughts in the Red River-Lake Winnipeg system.
• Habitat loss is most acute in the south from grassland conversion, shoreline development, and wetland drainage, while in the boreal it occurs through cumulative industrial footprint (cutblocks, roads, hydro corridors) that fragments large, connected habitat needed by boreal woodland caribou and wide-ranging predators.
• Nutrient loading (notably phosphorus) from the Red River basin and agricultural/municipal sources contributes to harmful algal blooms and degraded water quality in Lake Winnipeg and connected waters. Localized industrial contamination risks also occur near mining/processing sites and legacy landfills, affecting fish and freshwater mussels.
• Warming temperatures and shifting precipitation intensify flood/drought cycles in prairie watersheds, worsen algal-bloom conditions in Lake Winnipeg (warmer water, longer open-water seasons), and alter boreal fire regimes. Along Hudson Bay, reduced sea ice shortens hunting seasons for polar bears and changes coastal ecological timing for migratory birds.
• Zebra mussels and other aquatic invaders (e.g., spiny water flea in parts of the basin) alter food webs and water clarity in Lake Winnipeg and connected lakes/rivers, complicating native fish management and threatening sensitive species such as freshwater mussels. Invasive plants also affect prairie and wetland restoration sites.
• White-nose syndrome threatens hibernating bats (including Little Brown Myotis and Northern Myotis) in Manitoba, causing severe mortality and reducing insect-control ecosystem services. Wildlife disease surveillance is also important where dense waterfowl staging and changing climates can influence pathogen dynamics.
• Hydro generation and transmission, all-season roads, and river crossings can fragment habitat and change movement patterns (notably for boreal caribou). Dams and flow regulation influence aquatic habitat, sediment transport, and connectivity for species such as lake sturgeon in river systems connected to the Lake Winnipeg basin.
• Drainage and channelization in agricultural landscapes speed runoff and reduce wetland function, while flow regulation on major rivers can modify flood pulses needed for delta/wetland productivity (affecting fish spawning and waterfowl habitat). Fire suppression and altered fire regimes can also shift boreal forest structure over time.
• Commercial forestry in the boreal can create a patchwork of young forests and linear features that increase predator access and reduce effective refuge for boreal woodland caribou, adding to cumulative effects when combined with roads and other developments.
• Mining and associated exploration in northern and eastern Manitoba can introduce new roads, camps, and transmission corridors, increasing fragmentation and disturbance. Site-level risks include water withdrawals, tailings management, and localized contamination that can affect downstream aquatic ecosystems.
• Manitoba's large inland fisheries (including Lake Winnipeg) require careful management to avoid depletion and to maintain age structure in key stocks. Species with slow maturation (e.g., lake sturgeon) are particularly vulnerable to overharvest and bycatch pressures if not tightly regulated.
• Recreation and tourism (including the globally significant wildlife tourism hub around Churchill) can disturb denning/roosting/nesting sites if not managed carefully. In the south, disturbance near beaches and riverbars can affect ground-nesting birds such as Piping Plover.
• Polar bear-human conflict around Churchill during the ice-free season requires active management (attractant control, deterrence, holding facilities) to protect both people and bears. In agricultural regions, conflicts with black bears, wolves/coyotes, elk, and waterfowl can lead to pressure for lethal control or reduced tolerance.
• Growth and expansion around Winnipeg and other municipalities increases habitat fragmentation, stormwater runoff, shoreline pressure on rivers/lakes, and collisions (roads/windows), while also concentrating demand for recreation in sensitive nearby natural areas.