By Jonathan Robert Bart, Victoria Helen Johnston
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Additional info for Arctic Shorebirds in North America : a Decade of Monitoring
2009). The estimated number of pairs breeding on surveyed plots was 35. 63) on the AMSA. These values virtually bracket the range of densities reported in most other studies throughout this species’ range (Gill et al. 2002). White et al. (1977), however, estimated densities of 40–80 birds/km2 on Amchitka Island in the central Aleutians. 63) in the AMSA. It must be recalled, as described in the Methods section, that the sites in the AMSA were not randomly selected and we have little way to estimate selection bias.
Red Phalarope Red Phalaropes were recorded only on the YDSA. A nest, 15 pairs, and 49 singles were recorded, almost exclusively in wetlands. The estimated number of birds breeding on surveyed plots was only 15, 12 in wet habitats and three in moist habitats. 53). This low density is consistent with previous findings in our area (Gill and Handel 1990, B. J. McCaffery, pers. ), but markedly lower than densities ranging from 88 to 144 birds/km2 at two sites north of the Yukon–Kuskokwim Delta on the Seward Peninsula (Kessel 1989).
McCaffery, pers. ). Pectoral Sandpiper Pectoral Sandpipers were recorded only on the YDSA, where they are a common spring migrant in late May, but only a rare breeder (McCaffery, pers. ). Ten pairs and 19 single birds were recorded, mainly in wetlands. The number of pairs estimated to be breeding on surveyed plots was 18, but we note that courtship displays are common among birds in migrant flocks. 35). 35). Short-billed Dowitcher Short-billed Dowitchers were recorded only on the APSA. Surveyors recorded one nest, five pairs, and 20 single birds, mainly in wetlands.
Arctic Shorebirds in North America : a Decade of Monitoring by Jonathan Robert Bart, Victoria Helen Johnston