Proven Lake Wildlife Management Area is located in southcentral Manitoba, south of Riding Mountain National Park and near the town of Erickson. The lake, which contains a few wooded islands, is shallow with a predominantly peat bottom. It has extensive beds of the invasive reed Phragmites, which often extend as much as 3 metres above the water level. The rolling lands that surround the lake are used for a variety of purposes, from cultivation for cereal grain and canola production, to cattle ranching. There are also large patches of aspen woods nearby.
Black-crowned Night Herons have a history of usage of the site. In a 1966 survey, over 300 nests were observed, while 200 nests were reported almost 30 years later in 1995. This colony represents 4% of the estimated Canadian population for this species.
Other species found nesting at Proven Lake include large numbers of Eared Grebes (150 nests in 1996), and Franklins Gulls (800 nests in 1966), as well as Great Blue Heron and American Bittern. Also, records from the 1970s show that up to 8,800 American Coots, and several thousand Mallards have been seen on the lake in early fall.
BirdLife International (2021) Important Bird Areas factsheet: Proven Lake WMA. Downloaded from http://www.birdlife.org on 05/03/2021.