IBA Riverton Sandy Bar
Riverton, Manitoba
Site Summary
MB091 Latitude
Longitude
51.005° N
96.890° W
Elevation
Size
218 m
18.24 km²
Habitats:
freshwater lake, other
Land Use:
Nature conservation and research, Fisheries/aquaculture, Hunting, Tourism/recreation
Potential or ongoing Threats:
Disturbance, Recreation/tourism
IBA Criteria: Globally Significant: Congregatory Species, Colonial Waterbirds/Seabird Concentrations
Conservation status: IBA Conservation Plan written/being written
Restricted access for IBA coordinators
Login name: Password:

Login


View in mobile


Site Description
The Riverton Sand Islands are located off the western shore of Lake Winnipeg near the community of Riverton (directly west of Hecla Island). They consist of a series of three small islands extending between Riverton Marsh eastward toward Sand Point on Hecla Island. The islands are comprised of sand and gravel that has been partially colonized by grasses and willows. The closest island is located only 50 metres from shore and is connected to the mainland by a sandbar during low water years. Sand Point on Hecla Island is also included within this site.
Birds
This site supports significant concentrations of Ring-billed Gulls and Common Terns. About 1% (10,000 nests) of the world's estimated Ring-billed Gull population were present in 1991. In addition, a total of 800 Common Tern nests, or about 2% of the estimated North American population were present on Sand Islands #2 and #3. Nesting Herring Gulls were also present, with 153 nests being recorded in 1991. The Sand Point on Hecla Island is also noted as a major roost site for pelicans, gulls and terns.

There are also occasional records of nesting Piping Plovers (nationally endangered and globally vulnerable) on the Riverton Sand Islands and on the adjacent Hecla Island Sand Point. During the 1991 International Piping Plover census one pair of Piping Plovers was recorded at each site, while during the 1996 International census only a single pair of Piping Plovers was recorded at the Hecla Island Sand Point.

In addition to the importance of these islands and sandspits to nesting birds, they are also heavily used by several species during migration. The area is reportedly a major concentration site for migrating Canada Geese and Snow Geese although the numbers have not been documented. It has also been reported that hundreds of migrating Sanderlings use the site along with lesser numbers of Ruddy Turnstones and other shorebirds.




IBA Criteria
SpeciesT | A | I Links Date Season Number G C N
Ring-billed Gull 1991 SU 20,000
Rusty Blackbird 2014 - 2016 FA 38 - 50
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
In some years the islands closest to shore are accessible to all-terrain vehicles, and the birds leave the islands if they are repeatedly disturbed. In most years, however, the water levels are deep enough to prevent this from happening. The artificially high water levels that are maintained by he provincial government, however, lead to less shoreline for the Piping Plovers and increased erosion. There is also some desire to develop this site for ecotourism, which could increase the level of disturbance, but might also lead to more vigilant protection. The continued suitability of these islands for nesting colonial waterbirds depends on the suitability of habitat conditions. Important natural forces include water currents, and ice scouring, which removes colonizing vegetation.

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