IBA Whitewater Lake
Boissevain, Manitoba
Site Summary
MB015 Latitude
Longitude
49.247° N
100.301° W
Elevation
Size
457 - 460 m
139.75 km²
Habitats:
sedge/grass meadows, freshwater lake, inland saline lake, other urban/industrial areas
Land Use:
Nature conservation and research, Hunting, Rangeland/pastureland, Tourism/recreation, Water management
Potential or ongoing Threats:
Drought, Interactions with native species/disease
IBA Criteria: Globally Significant: Congregatory Species, Waterfowl Concentrations, Shorebird Concentrations, Continentally Significant: Congregatory Species, Nationally Significant: Congregatory Species, Wading Bird Concentrations
Conservation status: IBA Conservation Plan written/being written, Provincial Wildlife Management Area
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Site Description
The Whitewater Lake catchment basin is located in the southwestern corner of Manitoba, north of Turtle Mountain Provincial Park. It is an alkaline lake that may contain no water for two or three years at a time during dry cycles; during normal years it covers 6,070 hectares, but can be as high as 10,320 hectares (and two metres deep) during years with increased run-off. Over the past 100 years there have been several decades, such as the 1930s and 1980s, in which the lake was dry most of the time. Several small creeks drain into Whitewater Lake, but there is no major natural outlet. The flat terrain surrounding the lake is used for agricultural production. A small rare herbaceous plant (Heliotropium curassavicum) is found here. At the east end of the lake, Ducks Unlimited (DU) have constructed a number of dykes, creating basins that attempt to stabilize water levels for nesting and migrating waterfowl.
Birds
Up to a quarter of a million geese and ducks have been recorded at Whitewater Lake during fall migration. Many of these birds were Snow Geese, while many others were migrating ducks of several species. About 7% of the Mid-continent population of Snow Geese consistently pass through the Whitewater Lake area in the fall. Also, up to 2,000 Tundra Swans have been recorded in November; this is about 2% of the eastern population of the species. The lake is also used by several geese species, coots and ducks as a spring staging area.

Periodically, when the lake levels are low, the largest shorebird concentrations in southern Manitoba occur on this lake, with up to 23,068 shorebirds observed in the spring of 1987. An impressive 10,000 White-rumped Sandpipers were seen here in 1988; this is 2.5% of the known winter population of the species. Collections of shorebirds dead from botulism in 1998 revealed that Pectoral Sandpipers and Lesser Yellowlegs were the most common species present.

Various waterbirds nest here in significant numbers. Eighty-five pairs of Black-crowned Night Herons have been recorded here. This figure represents 1.7% of the estimated Canadian population for this species. Franklins Gulls nest here in globally significant numbers, with over 3,000 pairs, which is over 1% of the estimated North American population. Also, over 350 Eared Grebes pairs nest at this site. Numerous other wetland and upland prairie species nest at Whitewater Lake and the surrounding area.




IBA Criteria
SpeciesT | A | I Links Date Season Number G C N
American White Pelican 2016 FA 1,553 - 1,691
Buff-breasted Sandpiper 2015 FA 67
Franklin's Gull 2017 SP 7,500 - 9,061
Franklin's Gull 2003 - 2010 SU 10,000 - 80,000
Loggerhead Shrike 2002 - 2004 SP 2
Loggerhead Shrike 2005 - 2010 SU 1
Long-billed Dowitcher 2017 FA 2,061 - 2,196
Pectoral Sandpiper 2014 - 2016 FA 604 - 2,500
Pectoral Sandpiper 2015 SP 500 - 800
Sandhill Crane 2003 FA 120,000
Short-billed Dowitcher 2015 - 2017 FA 1,400 - 4,416
Snow Goose 1974 FA 59,214
Snow Goose 1982 WI 200,000
Tundra Swan 1982 - 2016 FA 1,640 - 2,000
Waterbirds 1995 FA 250,000
Waterbirds 1949 - 1996 OT 30,000 - 116,540
Western Grebe 2016 - 2017 FA 1,000 - 2,080
Western Grebe 2017 SP 1,004
White-rumped Sandpiper 1988 SP 10,000
Note: species shown in bold indicate that the maximum number exceeds at least one of the IBA thresholds (sub-regional, regional or global). The site may still not qualify for that level of IBA if the maximum number reflects an exceptional or historical occurrence.
 
Conservation Issues
Whitewater Lake is susceptible to botulism outbreaks, such as in 1996 when an outbreak killed about 116,000 waterfowl and other waterbirds; Ducks Unlimited and other agencies are attempting to solve this problem. Ducks Unlimited have also constructed a number of dykes to create enclosed cells and, because of this, the lake is now less susceptible to drought. The droughts of recent years that have occurred may be the reason behind the lower numbers of nesting birds in the surrounding ponds.

The lake itself is designated a Wildlife Management Area under provincial regulations, so it is afforded a measure of protection. Beyond the lake, the grazing of geese in agricultural fields is of some concern to local farmers. Some farmers would like to have an outlet for the lake established, but this is not favoured by DU who have had a long-term interest in the area. DU, Manitoba Conservation and the Turtle Mountain Conservation District have developed several viewing sites around the lake.


The IBA Program is an international conservation initiative coordinated by BirdLife International. The Canadian co-partners for the IBA Program are Bird Studies Canada and Nature Canada.
   © Bird Studies Canada