Population status

Solitary Sandpiper
(Tringa solitaria)

The Solitary Sandpiper breeds in boreal habitats, which are largely inaccessible for surveying, and winters in subtropics and tropics, south of areas well covered by the Christmas Bird Count (Moskoff 2011). The Breeding Bird Survey (BBS) provides the best information on the species' long-term population status, though coverage is lacking in the north, which is the area of highest abundance. Results from the BBS suggest that the Canadian population has shown a large increase since 1970, though there is regional variation. All Bird Conservation Regions (BCR) are shown below, regardless of their reliability; note that only the Northern Rockies and the Boreal Taiga Plains BCRs are moderately reliable, the rest are rated as having low reliability. The western populations appear to show larger increases than the central and eastern populations. Additional information is available from surveys during migration, although the species does not aggregate in large flocks and counts are typically low. Results from migration monitoring suggest little overall change in the continental population relative to the mid-1970s. BBS results at the continental scale (i.e. including Alaska, which shows a large decrease) also show little change since 1970. Previously reported declines (Bart et al. 2007, Morrison et al. 2006) were based mostly on data from the eastern half of North America, up to the late 1990s. Declines were also detected during the second Atlas of the Breeding Birds of Ontario (2001-2005), relative to the first atlas (1981-1985; see below). Considering both the Canadian BBS data and the continent-wide migration data, the current population status for Solitary Sandpiper in Canada is perhaps best described as having increased since the early 1970s, though the magnitude of that increase is unclear, as is the degree of regional variation. Due to the surveys' incomplete coverage of the species' range and population in Canada, the reliability of this assessment is considered medium. The Solitary Sandpiper is currently at an acceptable level relative to its national population goal (see Canada graph below).

 

Population goal and acceptable levels of variation

Species/groupGoalLower levelUpper level
Solitary SandpiperMean abundance (2008-2012)10th percentile of observed abundance (1970-2012)Not applicable

Breeding Bird Survey (BBS) - Canadian analysis

Additional information on: Breeding Bird Survey (BBS) - Canadian analysis

Table 1: Population trends by geographic area
Geographic areaTime Period Table 1 - footnote 1 Annual trend Table 1 - footnote 2 Limits
LowerUpper
Canada Select to view graph of the geographic area: Canada 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20161.803.5
Northwestern Interior Forest Select to view graph of the geographic area: Northwestern Interior Forest 1973-2016; Breeding Bird Survey (BBS) - Canadian analysis1973-20163.90.87.6
Boreal Taiga Plains Select to view graph of the geographic area: Boreal Taiga Plains 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.6-23
Taiga Shield And Hudson Plains Select to view graph of the geographic area: Taiga Shield And Hudson Plains 1989-2016; Breeding Bird Survey (BBS) - Canadian analysis1989-20160.8-35.8
Boreal Softwood Shield Select to view graph of the geographic area: Boreal Softwood Shield 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.5-4.36.6
Northern Rockies Select to view graph of the geographic area: Northern Rockies 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20161.3-0.93.5
Prairie Potholes Select to view graph of the geographic area: Prairie Potholes 1971-2016; Breeding Bird Survey (BBS) - Canadian analysis1971-20161.5-4.46
Boreal Hardwood Transition Select to view graph of the geographic area: Boreal Hardwood Transition 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-0.6-11.35.2
North America Select to view graph of the geographic area: North America 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-0.2-21.4
 

Analyses of Shorebird Migration Monitoring Data

Additional information on: Analyses of Shorebird Migration Monitoring Data

Table 2: Population trends by geographic area
Geographic areaTime PeriodAnnual Trend Table 2 - footnote 1 Limits
LowerUpper
North America Select to view graph of the geographic area: North America 1974-2016; Analyses of Shorebird Migration Monitoring Data1974-2016-0.1-2.82.8
 

Atlas of the Breeding Birds of Ontario

Additional information on: Atlas of the Breeding Birds of Ontario

Table 3: Population trends by geographic area
Geographic areaTime PeriodAnnual trend (%) Table 3 - footnote 1 Limits
LowerUpper
Ontario1981/85 - 2001/05-2.3-4.1-0.6
 

References