Habitat & Species
Water Quality
Aquatic habitat and species in the Athabasca sub-basin are undergoing moderate change. This assessment is based on observations of changes in the abundance and health condition of some fish and furbearer species as reported by Indigenous communities. Less healthy fish with deformities and tumours and mass fish die-offs in some lakes have been observed by Indigenous communities and local residents of the middle and lower Athabasca watersheds. Studies based on scientific and local knowledge observations have documented elevated mercury concentrations in fish in the lower Athabasca. In the Peace-Athabasca Delta, a significant decline in muskrat (Ondatra zibethicus) populations and mass die-off events have been documented by scientists, elders and trappers, linked to increased contamination and changes in hydrologic patterns in the Delta. Scientific or Indigenous Knowledge observations of changes in wetland cover or riparian forests in the sub-basin were not found.
The following table summarizes the availability of information for each Habitat and Species indicator.
Signs and Signals | Indigenous Knowledge Information and Data | Indigenous Knowledge Availability in Public Sources1 | Science Information and Data | Science Data Availability2 |
Fish | Oral histories and local observations of fish abundance, timing and distribution, species diversity and fish health condition. | Many observations from several locations. | Fish (including salmon, suckers, pickerels, burbot) abundance, timing and distribution, species diversity and fish health condition. | Many data on fish population and health. |
Wetlands | Oral histories and stories of wetland and forest (and other habitat / land use) | Some observations from few locations. | Number, location and total area of wetlands. Species diversity in wetlands where available. | Wetland mapping available from a variety of sources. |
Riparian Forests | Local observations and oral histories of riparian forests | No information found. | Number, location, total area of riparian forests areas. Species diversity of riparian forests where available. | Limited information found. |
1 Qualifiers for the availability of local and Indigenous Knowledge observations in publicly available sources: Limited = 1-2 observations; Some = 3-4 observations; Many = 5 or more observations
2 Qualifiers for the availability of science data in publicly available sources: Low = Individual studies or locations; Many = Network of monitoring stations across the basin
Fish
Declines in some fish populations and health condition have been observed by Indigenous communities and local residents in the Athabasca sub-basin.
Fish are reportedly less healthy and mass fish die-offs have been observed in lakes in the lower and middle Athabasca. Mikisew Cree community members participating in a community-based monitoring program have observed more deformities and tumours in fish collected from traditional use areas such as the Quatre Fourches and Jackfish areas of the Peace-Athabasca Delta. Smaller fish and fish with deformities have been observed in lakes and rivers by Denesuline elders from Black Lake and Fond du Lake and Hatchet Lake, which the elders associate with the disruption of fish habitat by mining exploration in the region. Lower fish health compared to upstream baseline conditions were also found by the Joint Oil Sands Monitoring Program in the lower MacKay River, Ells River and in the Athabasca River below the Muskeg River, above the Ells River and below the Firebag River.
Mass fish die-off events have been described by Indigenous communities and stewardship groups in some lakes in the lower Athabasca. An increase in the frequency of blue-green algae blooms has been noted in recent years by residents of Baptiste and Island Lakes, raising concerns for the impacts on fish populations.
Dene Elders have observed smaller fish in lakes and rivers as well as deformed fish and new species,
Bull trout historic and current adult densities across its native range in Alberta. Available from Alberta Environment and Parks website*.
*
Wetlands & Riparian Forests
Wetland cover in the Athabasca sub-basin is small, and information on changes over time in wetlands in the sub-basin is limited. Notably, the Peace-Athabasca Delta, a globally-significant wetland, has become drier in the past century and Indigenous communities have observed a significant decline in muskrat (Ondatra zibethicus) populations in the Delta.
Elders and Indigenous land users in the Peace-Athabasca Delta (PAD) have observed a dramatic decline in the relative abundance of muskrat in recent decades (~1935–2014),
A sharp decline in muskrat (Ondatra zibethicus) abundance in the Peace-Athabasca Delta has been observed by a research team of scientists and elders and trappers from Mikisew Cree First Nation, Athabasca Chipewyan First Nation, and Fort Chipewyan Métis Local #125. Lower water levels, changing flooding patterns and contamination from upstream hydroelectric development and oil sands projects are thought to be contributing factors to the muskrat die-offs observed at various times of the year in the Delta. The environmental factors driving the drier conditions are a topic of much debate. However, a considerable body of research based on natural historical records preserved in lake sediments and tree rings indicates that drying of the Delta is driven by changes in local climate and a long-term decline in discharge of eastward-flowing rivers draining the Rocky Mountains and foothills.
Ecological and Cultural Significance of the Peace-Athabasca Delta
The Peace-Athabasca Delta (PAD) occurs at the confluence of the Peace and Athabasca Rivers on a land base of approximately 3900 km2 in northern Alberta and the Northwest Territories. The PAD consists of a dynamic ecosystem of rivers, lakes, channels, marshes and grasslands that support a diversity of fish and wildlife. Wetlands in the PAD support approximately 45 species of mammals, 214 species of birds, and 20 fish species. As one of the largest inland freshwater deltas in the world, the PAD is designated as a Ramsar site, or a Wetland of International Significance. Approximately 80% of the PAD lies within Wood Buffalo National Park, a designated World Heritage Site.
The Peace-Athabasca Delta is the ancestral homeland of the Cree, Chipewyan and Métis peoples and has sustained their traditional cultures and ways of life for generations. Waterways in the PAD provide a vast network of water transportation routes that enable traditional land users to access preferred harvesting areas, cabins, campsites, and other cultural use areas. Wildlife populations of fish, furbearers, mammals and waterfowl and many types of vegetation continue to provide for subsistence, material and cultural uses. Moose (Alces alces), muskrat (Ondatra zibethicus), walleye (Sander vitreus), whitefish, and jackfish are a few of the many species of cultural significance to local Indigenous communities.
Before the rise of industrial development, ice jams in the springtime would cause the Peace and Athabasca rivers to overflow their banks and flood the Peace-Athabasca Delta, replenishing the landscape and perched basins with fresh water. Perched basins are high-elevation catchment areas that are solely replenished by overland flooding. When filled with water, perched basins in the Peace-Athabasca Delta provide quality wildlife habitat. Yet in the absence of ice jams and with lower water levels and changing flow patterns in the Delta, many of these perched basins are drying up. These changes diminish the quality of aquatic habitat and lead to displacement of wildlife populations (such as muskrat, beaver (Castor Candensis) and moose) from the region.
Richardson Lake in the Peace-Athabasca Delta. Photo by Megan Spencer.
Change in Wetland Cover in the Athabasca Sub=basin 1990 to 2010
Land Cover Type | Area 1990 (km2) | Area 2010 (km2) | Change (km2) | Change (%) | 1990 % cover | 2010 % cover |
Forest Wetland | 27546 | 27436 | -109 | -0.4% | 10.9% | 10.9% |
Treed Wetland | 1307 | 1297 | -10 | -0.8% | 0.5% | 0.5% |
Wetland | 407 | 351 | -56 | -14% | 0.2% | 0.1% |
Wetland Shrub | 11300 | 11223 | -77 | -0.7% | 4.5% | 4.4% |
Wetland Herb | 2778 | 2677 | -101 | -3.6% | 1.1% | 1.1% |
Total Wetland | 43337 | 42984 | -353 | -0.8% | 17.2% | 17.0% |
References
Health & Wellbeing