Site Complet

Shallow Bay, Big Slough and Swan Lake (YK014)

Recherche

Shallow Bay, Big Slough and Swan Lake (YK014)

Whitehorse, Yukon

Latitude 60,936°N
Longitude 135,072°O
Altitude 1 000m
Superficie 170,73km²

Description du site

Shallow Bay, Big Slough, and Swan Lake are located at the southwest end of Lake Laberge, in the Yukon Territory. Lake Laberge is a large (50 by 5 km) lake oriented roughly north-south, that is about 30 km north of Whitehorse. Shallow Bay is a shallow lake located 2 km west of the Yukon River inflow and connected to Lake Laberge via a 400 m channel which varies from a trickle at low water to a broad expanse at high water. Big Slough is a 4.5 km oxbow located on the Yukon River four kilometres upstream from its inflow to Lake Laberge. Swan Lake is a lake and adjacent 13 sq. km fen complex located two km east of the Yukon River, draining north into Lake Laberge via Laberge Creek, 2 km east of the main Yukon River Inflow. The Yukon River inflow to Lake Laberge consists of a large expanse of seasonally exposed sand and mudflats with braided channels. Marsh vegetation and extensive willows border much of the shore.

Oiseaux

In April and May, Shallow Bay is one of southern Yukons best sites for waterfowl viewing. In the spring, the site does not open as early as do the lake outlets, but when there is an early spring, as in 1994, it gets very high use by waterfowl. The Pacific Coast population of Trumpeter Swans pass through here during spring migration in globally significant numbers. On April 18, 1994, a tally of 200 was made, which represents at least 1% of the global population. Other waterfowl, such as Tundra Swans (600 in April 1994), American Wigeons, scaup, and scoters, also stage here during migration. In general, the area is important to waterfowl in both spring and fall. The total number of waterfowl using the site in spring, summer (breeding and moulting), and fall is somewhere between 50,000 and 100,000 birds, which are globally significant numbers.

A record of 1,050 Mew Gulls during spring migration is significant, representing over 2% of the North American population. Other gulls can be fairly numerous, with 320 Herring Gulls reported in late June, 1998. Some passerines can be observed in high numbers during migration, such as Lapland Longspur - 1,000 were recorded on May 7, 1994. Snow Buntings can be seen in the hundreds, especially during fall migration. Also, this is one of the few places in the region known to host concentrations of loons, with up to 150 (Common, Red-throated or Pacific) being seen staging in spring at the Yukon River inflow to Lake Laberge.

At least 65 species of birds have been confirmed breeding at the site including Mallard (20 pairs), Northern Pintail (2 pairs), scaup (5 pairs), Barrows and Common Goldeneye (5 pairs), Wilsons Phalarope (1 family) and Short-billed Dowitcher (1 family).

Over 157 species of birds have been sighted at Swan Lake to date. Significant high counts of spring and fall migrants include 550 American Green-winged Teal (September 24, 1977), 430 Mallard (October 25, 1987), 525 American Wigeon (May 7, 1986), 350 Surf Scoter (May 15, 1983) and 500 Lesser Yellowlegs (May 13, 1984).

Enjeux de conservation

Due to the site being on a large lake near a major centre like Whitehorse, it could potentially be threatened by recreational activities disturbing the breeding or migrating birds. There is not protection or conservation status at present, but the site has been included in the key wetland notation areas of the Yukon; it has also been recommended as a cooperative National Wildlife Area because of its importance as a waterfowl staging, moulting and breeding site.

Catégories ZICO Habitats Usages Menaces Potencielles ou Existantes Status de Protection
Goéland arctique (thayeri)
Nombre Année Saison
3602016Printemps
Bécasseau à poitrine cendrée
Nombre Année Saison
5002017Printemps
700 - 1 1002015Printemps
600 - 8002014Printemps
6002013Printemps
5002011Printemps
Cygne trompette
Nombre Année Saison
300 - 5002016Printemps
2001994Printemps
Quiscale rouilleux
Nombre Année Saison
502016Automne
25 - 302013Printemps
30 - 652012Printemps
Goéland cendré
Nombre Année Saison
4 5002017Printemps
1 0501995Printemps
Oiseaux aquatiques
Nombre Année Saison
50 0001995Autre
5 0001977Printemps
Bécassin à long bec
Nombre Année Saison
1 5002013Printemps
2001990Printemps