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20-548: The wildlife management area encompasses the entirety of Boundary Bay , a shallow bay of the Salish Sea straddling the border between the Canadian province of British Columbia and the U.S. state of Washington . The northeastern portion of the bay, named Mud Bay after the large mudflats found there, is of particular importance due to the region's high biodiversity and ecological productivity . The management area also protects

40-514: A large harbour seal population, attracts grey whales and orcas , and provides spawning and feeding grounds for salmonids and Pacific herring . [REDACTED] Media related to Boundary Bay Wildlife Management Area at Wikimedia Commons Boundary Bay Boundary Bay is a shallow bay situated on the Pacific coast of North America on the Canada–United States border between

60-550: Is a dialect form of "dunling", first recorded in 1531–1532. It derives from dun , "dull brown", with the suffix -ling , meaning a person or thing with the given quality. It is a circumpolar breeder in Arctic or subarctic regions. Birds that breed in western Europe are short-distance migrants largely staying on western and southern European and northwest African coasts; those breeding in far northern Europe and Asia are long-distance migrants, wintering south to Africa, southeast Asia and

80-559: Is blunt. The call is a typical sandpiper "chreep", and the display song a harsh trill. Dunlin are small migratory waders, however they show strong philopatry with individuals of the southern subspecies Calidris alpina schinzii in Sweden and Finland returning to, or very close to, their natal patches. Habitat fragmentation has reduced the availability of habitat patches to these birds through reducing patch size and increasing patch isolation. This reduced connectivity between patches has reduced

100-488: Is from Latin and means "of high mountains", in this case referring to alpine tundra habitats generally, rather than the Alps specifically. Ten subspecies are recognised: Measurements : An adult dunlin in breeding plumage shows the distinctive black belly which no other similar-sized wader possesses. In winter, dunlins are basically grey above and white below. Juveniles are brown above with two weak whitish "V" shapes on

120-577: Is known as Mud Bay. The main rivers flowing into the bay are the Nicomekl and Serpentine Rivers falling into Mud Bay, the Campbell River falling into Semiahmoo Bay, and California Creek and Dakota Creek falling into Drayton Harbor. It is an important stop for birds migrating along the Pacific Flyway , particularly for western sandpiper and dunlin , and has been designated a Hemisphere Reserve by

140-458: Is provided by the male, as the female deserts the brood and often leaves the breeding area. Apparent hybrids between this species and the white-rumped sandpiper as well as with the purple sandpiper have been reported from the Atlantic coasts of North America and Europe, respectively. The dunlin has an extremely large range and although the population appears to be decreasing, the population

160-520: Is still very large. The International Union for Conservation of Nature (IUCN) has judged that the threat to the species is of " Least concern ". The dunlin is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds ( AEWA ) applies. The southern subspecies C. a. schinzii is of particular concern, declining and endangered in some areas, particularly towards

180-415: Is the species with which other waders tend to be compared. At 17–21 cm (6.7–8.3 in) length and with a 32–36 cm (13–14 in) wingspan , it is similar in size to a common starling , but stouter, with a longer, thicker bill. The dunlin moves along the coastal mudflat beaches it prefers with a characteristic "sewing machine" feeding action, methodically picking small food items. Insects form

200-627: The Canadian province of British Columbia and the U.S. state of Washington . Boundary Bay is bounded to the east by the city of Blaine in Washington and the cities White Rock and Surrey in British Columbia. It is also bounded to the east by the reserves of the Semiahmoo First Nation in British Columbia. To the north, it is bounded by the City of Delta . To the west, it is bounded by

220-533: The Western Hemisphere Shorebird Reserve Network and a Canadian Important Bird Area . The mudflats , extensive eel grass beds and salt marshes support a rich population of marine invertebrates which are an important source of energy for migrating shorebirds . During migration times the bird count in the bay may exceed 100,000. [1] Pollution and industrial activity in the area pose potential threats to wildlife. On June 21, 1995,

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240-483: The location as Lapland. This species was formerly placed (with the other " stints ") by some American authors in the genus Erolia , but is now placed with 23 other sandpipers in the genus Calidris that was introduced in 1804 by the German naturalist Blasius Merrem . The genus name is from Ancient Greek kalidris or skalidris , a term used by Aristotle for some grey-coloured waterside birds. The specific alpina

260-715: The Middle East. Birds that breed in Alaska and the Canadian Arctic migrate short distances to the Pacific and Atlantic coasts of North America, although those nesting in northern Alaska overwinter in Asia. The dunlin was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Tringa alpina . Linnaeus specified

280-716: The Tsawwassen Peninsula, which contains the communities of Tsawwassen (a suburb of Delta ) and Point Roberts, Washington (a pene-exclave of the United States ). To the south, it is bounded by the Strait of Georgia , the northern arm of the larger Salish Sea . The eastern section of Boundary Bay straddling the US/Canada border and adjacent to the cities of White Rock and Blaine is known as Semiahmoo Bay ; Blaine's Drayton Harbor opens into it. The northern tip of Boundary Bay

300-450: The back, though less obvious than the same feature on little stint and some other species in the genus. They usually have black marks on the flanks or belly. All ages show a narrow white wingbar in flight. The legs and slightly decurved bill are black. The subspecies differ mainly in the extent of rufous plumage and the size of the black belly patch in the breeding season, and the bill length; in winter there are no subspecific distinctions in

320-559: The entire Canadian portion of Boundary Bay was protected within the Boundary Bay Wildlife Management Area . The area is also used for recreational boating and includes park area and beaches. The Boundary Bay Airport , on its north flank, is used by small aircraft and has been the setting for various film shoots. Dunlin The dunlin ( Calidris alpina ) is a small wader in the genus Calidris . The English name

340-506: The estuaries of the Serpentine and Nicomekl rivers, both of which drain into Mud Bay from the northeast. The intertidal salt marshes and mudflats of Boundary Bay support large communities of sea asparagus and various grasses. Common bird species found in the wildlife management area include American wigeon , great blue heron , western sandpiper , rough-legged hawk , northern harrier , bald eagle , and barn owl . The bay supports

360-426: The main part of the dunlin's diet on the nesting grounds; it eats molluscs , worms and crustaceans in coastal areas. The nest is a shallow scrape on the ground lined with vegetation, into which typically four eggs are laid and incubated by the male and female parents. Chicks are precocial , but are brooded during early development. They start to fly at approximately three weeks of age. The majority of brood care

380-423: The movements of Dunlin leaving them more susceptible to inbreeding in these locations. The dunlin is highly gregarious in winter, sometimes forming large flocks on coastal mudflats or sandy beaches. Large numbers can often be seen swirling in synchronized flight on stop-overs during migration or on their winter habitat. This bird is one of the most common waders throughout its breeding and wintering ranges, and it

400-508: The plumage, with only the bill length providing a limited guide. Bill length varies between sexes, the females having longer bills than the males, further complicating winter subspecies identification. On the tip of the Dunlin's bill is a soft covering that fills with blood and with many nerve endings, forming a sensitive probe that is used to locate invertebrate prey in mud and sand. Although the bill can look sharp-pointed in dead specimens, in life it

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