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Because Lesser Scaup are a dominant component of the combined population, changes in population status of the less abundant Greater Scaup may be undetectable. Head, neck and breast are black with purple gloss. The Lesser Scaup has a peaked, angular head that the Greater Scaup lacks. Scaup Migration Maps. Two Scaup species occur in Canada, the Greater Scaup and the Lesser Scaup. Species on the move this week will include Red-breasted Merganser, Snow Goose, Bufflehead, Long-tailed Duck, Lesser Scaup, Hooded Merganser, Ross’s Goose, Greater Scaup, Sabine’s Gull (this is often a window in which this species appears), Bohemian Waxwing, Lapland Longspur, Common Redpoll, Whooping Crane, and Common Goldeneye. Lesser Scaup. In addition, biologists have estimated that nearly 90% of the continental scaup population is comprised of Lesser Scaup ( Bellrose 1980 ), further pointing to its decline. In flight they show white patches along the length of the trailing edge of the wing. Research Article Environmental Factors Influence Lesser Scaup Migration Chronology and Population Monitoring TAYLOR A. FINGER,1,2 Department of Biology, Western University, London, ON N6A 5B7, Canada ALAN D. AFTON, U.S. Geological Survey, Louisiana Cooperative Fish and Wildlife Research Unit, Louisiana State University, Baton Rouge, LA It is colloquially known as the little bluebill or broadbill because of its distinctive blue bill. few male scaup have been implanted so far, the discussion below will be limited primarily to adult female Lesser Scaup. Greater Scaup is extremely similar to Lesser Scaup , but with a different head shape (more rounded, highest point near front of head), a larger bill, and a longer white wing stripe visible in flight. The spring condition hypothesis (SCH) states that the current decline of the North American scaup population (Lesser [Aythya affinis] and Greater Scaup [A. marila] combined) is due to a decline in quality or availability of scaup foods on wintering, spring migration, or breeding areas that has caused a reduction in female body condition and subsequent reproductive success. In summer, nesting habitat is small wetlands with emergent vegetation in boreal forests and parklands. Lesser Scaup; Lesser Snow Goose (white) Lesser Snow Goose (blue) During migration, Lesser Scaups spend their time on rivers, lakes, and large wetlands. Winters on lakes, reservoirs, rivers, sheltered areas of coastal bays. Table 1. It forages by diving underwater to capture mollusks, crustaceans, and aquatic insects. Scaup are diving ducks with a resemblance to tufted ducks. Lesser Scaup: Medium-sized diving duck has finely barred gray back and gray-washed white underparts. Females are chocolate brown with lighter sides, red-brown head and white patch at base of dark gray bill. The Lesser Scaup is found in Tennessee during the winter, and especially during migration, when they can form large rafts* with other species of diving duck. The Greater and Lesser Scaup can be difficult to distinguish in the field. Marsh ponds (summer), lakes, bays, estuaries. Recruitment of lesser scaup in … The Auk , 121: 917-929. The lesser scaup (Aythya affinis) is a small North American diving duck that migrates south as far as Central America in winter. It has yellow eyes, blue-gray bill, black tail and black wings with white patches. Long clouded by confusion with hybrids, the first was identified as recently as 1987, in Staffordshire, but since this breaking of the credibility barrier, Lesser Scaup has been shown to be a vagrant in small numbers every year, with more than 150 records. Blood hemoglobin concentrations in scaup may be important determinants of body condition during spring migration, because scaup forage intensively in the spring by diving [9].Lovvorn and Barzen [41] defined stress as ''a situation when demands of one event (physiological, behavioral, or otherwise) are great enough to interfere with desirable allocation of resources to other processes.'' Lesser Scaup are far more likely than Greater Scaup to be found on fresh water inland during the winter. Migration: Summers in parts of the western United States, and much of western and central Canada. Winters along both U.S. coasts, in the southern U.S., and points south. What does scaup mean? To learn more about Scaup migration, please see our staff research on Greater and Lesser Scaup. 2014 ). Figure 1. Austin, J., C. Custer, A. Afton. The population status of Scaup in North America became a conservation concern due to apparent declines from historic high levels observed in the late 1970s. Either of two diving ducks (Aythya marila or A. affinis ... and many others pass through in migration :: of the former, the most numerous are mallard ... ducks, and mergansers. LESSER SCAUP (Aythya affinis) – (See images below) DESCRIPTION: The Lesser Scaup is a North American small diving duck, measuring some 45 cm (18 in.) The two closely related species are nearly identical in appearance, which causes difficulties distinguishing between them. Tundra Swan Migration Maps. scaup and mallards differed suggesting surveys designed for mallard migration may be biased for scaup. Study area depicting 6 eco-physiographic regions for observations of lesser scaup wetland use and feeding during spring migration (2004 and 2005) in the upper Midwest. The decline in numbers was most prevalent in the northern boreal forests of Alaska, the Yukon, and the Northwest Territories, a region where Lesser Scaup are more abundant than Greater Scaup. To explore patterns of prey use by lesser scaup and diet overlap with fishes, we quantified diets of scaup and fishes during the 2003 and 2004 spring migration in eastern South Dakota, U.S.A. long. The breeding population of scaup has declined steadily since 1980, dropping from about 6.3 million birds in the 1970s to fewer than 3.5 million in 2007. Lesser Scaup (Aythya affinis), version 1.0. Numbers of sampling clusters (C), randomly selected wetlands observed for lesser scaup use and feeding (N population (Lesser [Aythya affinis] and Greater Scaup [A. marila] combined) is due to a decline in quality or avail ability of scaup foods on wintering, spring migration, or breeding areas that has caused a reduction in female body Identifying environmental metrics specific to lesser scaup (Aythya affinis; scaup) spring migration chronology may help inform development of conservation, management and population monitoring. Males have black heads, shoulder and breast, white flanks, grey back and a black tail. The lesser scaup Aythya affinis has been a species of conservation concern since continental breeding populations began declining in the 1980s. The scaup decline is a particular concern in the Mississippi Flyway because, on average, 40% of the c ontinental scaup population winters there and 62% of the U.S. harvest of lesser scaup occurs in this flyway (Afton and Anderson 2001). Summers around large marshes in prairie or forested regions. Interactive eBird Map: Click here to access an interactive eBird map of Greater Scaup sightings Similar Species: Lesser Scaup , Ring-necked Duck. Also present was a nice duck flock of 76 common scoters 2 velvet scoters and a lovely male scaup. This female was seen at a slough in Dallas County, Iowa on April 10, 2020. Overlaps extensively with Greater Scaup, especially in winter, but at that season the Lesser is far more likely to be found on freshwater lakes and ponds well inland. The Greater Scaup averages about 10% longer and 20% heavier than the Lesser Scaup. The breeding male (drake) has a slightly iridescent black head, a black neck and breast, and rump. The Greater Scaup has a larger bill with a more pronounced nail (tip of the bill) than the Lesser Scaup. The Lesser Scaup is s one of the most abundant and widespread North American ducks. Nutrient reserves of lesser scaup (Aythya affinis) during spring migration in the Mississippi flyway: a test of the spring condition hypothesis. The causes of this decline are likely multifaceted, but cross-seasonal effects are believed to play a prominent role: females unable to acquire sufficient nutrient reserves during winter and spring migration have poor survival and breeding success. Females are brown, with characteristic white patches around the base of the bill. This is a true rarity, though now one which occurs annually. Areas in white were not sampled. The below maps show the spring (left) and fall (right) migration of Lesser Scaup. 1998. The back and wings are finely striated black on white, and the sides and belly are white. Lesser Scaup congregate on large lakes, reservoirs, and estuaries during migration and winter, sometimes by the thousands. The below map shows migration routes of individual Tundra Swans from 1998-2012, classified by year. 2000 , Anteau et al. Research is ongoing to understand why Scaup have declined during the drought years in the 1980s (similarly to other ducks), but were slow to recover when habitat conditions improved subsequently ( Austin et al. Two closely related species are nearly identical in appearance lesser scaup migration map which causes difficulties distinguishing them! 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