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. In 2013, the lake reached record high water levels and probably exceeded 14,000 hectares. 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, seaside heliotrope (Heliotropium curassavicum) that thrives in salty soil is found here. In 1989, Ducks Unlimited (DU) constructed a number of dykes in the east end of Whitewater Lake, creating basins that attempted to stabilize water levels for nesting and migrating waterfowl; these were largely destroyed by the high water of 2011 and 2013 The observation mound remains, but vehicle access is not possible. The northwest portion of the IBA includes an area of agricultural land with potholes and ephemeral wetlands that temporarily flood in high water years.

Birds
Whitewater Lake IBA is a key area for waterfowl and shorebirds during both spring and fall migrations, and an important breeding area for several species. 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. Even higher numbers were observed in the early 2000’s. Collections of shorebirds dead from botulism in 1998 revealed that Pectoral Sandpipers and Lesser Yellowlegs were the most common species present. Significant concentrations of shorebirds counted here includes: White-rumped Sandpiper (10,000, spring 1988), Pectoral Sandpiper (2,500, August 2014); Short-billed Dowitcher (4,175, August 2016), Long-billed Dowitcher (2,196, August 2017); Buff-breasted Sandpiper (67, August 2015); American Avocet (3,279, August 2016); Stilt Sandpiper (985, August 2017); Least Sandpiper (1,250, August 2007) and; Semipalmated Sandpiper (1,800, June 1985).

Various waterbirds nest here in significant numbers. Franklins Gulls nest here in globally significant numbers; an Environment and Climate Change Canada survey in 2007 estimated that over 184,000 Franklin’s Gulls were present in multiple colonies on the lake, more than 18% of the estimated global population. 2,739 Eared Grebes were nesting during the same survey. In August 2017, 4,098 Western Grebes were counted on a single day in August. Eighty-five pairs of Black-crowned Night Herons have been recorded here as do good concentrations of other long-legged wading birds, including White-faced Ibis, Great Egret, Cattle Egret and Snowy Egret. Over 80,000 swallows have been recorded in the IBA during fall migration.

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. Also, up to 2,000 Tundra Swans have been recorded in November; this is about 1% of the North American population of the species. The lake is also used by several geese species, coots and ducks as a spring staging area. A total of 1,691 American White Pelicans were counted in August 2016.




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 have attempted to solve this problem. Ducks Unlimited also constructed a number of dykes to create enclosed cells and, because of this, the lake was less susceptible to drought. The droughts of past years that occurred may have been the reason behind the numbers of nesting birds in the surrounding ponds. However, the exceptionally high-water levels experienced more recently resulted in the DU dykes bursting in many places and the system of cells are no longer functioning.

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 and following the record high water levels between 2013 and 2016, the pressure to establish this has increased. Stabilisation of water levels has been responsible for loss of emergent vegetation in other major Manitoban wetlands and therefore such a development might have major implications for the significant congregations of migrating and breeding birds at Whitewater Lake.

DU, Manitoba Sustainable Development and the Turtle Mountain Conservation District previously developed several viewing sites around the lake but these were washed away following record high water levels. There are a number of locations where the birds of Whitewater Lake can be viewed, primarily along road allowances.


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