Habitat
BREEDING: Grassy arctic and alpine tundra, usually in areas at lower elevation, in denser and taller vegetative cover than used by P. DOMINICA (breeding). Nests on grassy tundra; prefers dry upland areas. The nest is a shallow scraped-out depression, lined with mosses, leaves, grass, and lichens. In western Alaska, where DOMINICA and FULVA are sympatric, DOMINICA nests occurred more often in areas of higher elevation and slope, with sparser and shorter vegetation, and more rocks; FULVA nests were usually at lower elevations in denser and taller vegetative cover; both forms used relatively dry upland tundra (Connors et al. 1993). In western Alaska (P. FULVA), males returned to the same nesting territories in successive years; most females did not (Johnson et al. 1993). NON-BREEDING: short-grass prairie, pastures, mudflats, sandy beaches, and flooded fields.
Ecology
NON-BREEDING: In Hawaii, many establish winter territories to which they return each year; abandon territories at night and roost in flock (Johnson et al. 1981). Territorial birds had higher apparent survival rates than non-territorial wintering birds (Johnson et al. 2001). Winter mortality in Hawaii was caused by accidents (collisions) and probable predation by owls (Johnson et al. 2001).
Reproduction
Breeding begins in late spring. Clutch size usually 4. Incubation probably about 26 days, by both sexes. Young precocial, tended by both adults. Monogamous. First breeds at 1 year, though first-year females may breed less commonly than do first-year males (Johnson et al. 1993). Nesting density and/or nesting success may vary greatly over time and space (Johnson et al. 1993).