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Extra info for Arctic Shorebirds in North America : a Decade of Monitoring
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.
Camps were widely distributed across the study area, so they were treated as a simple random sample (rather than a stratified random sample). ^ was Under this assumption, the variance of R estimated as ͧ ^− ^ x−, y−) 2Cov( V^(y− ) _________ 2 V(x ) Ϫ V^(R^) ϭ R^ ____ ϩ _____ − xy x−2 y−2 ͨ (12) where 1 2− ^ − 1 2− 1 − − ___ ___ ^ − − V^(x− ) ϭ ___ m s (xi), V( y ) ϭ m s (yi), Cov(x , y ) ϭ m cov(xi, yi) and s2 and coˆv indicate the sample variances and covariances, respectively. Estimates will often be needed within a stratum, habitat, or region.
25). This estimate is a significant fraction of the estimated global population of 95,000 (Handel and Gill 1992, Morrison et al. 2006). Marbled Godwit Rock Sandpiper Marbled Godwits were observed at two sites in the APSA (Pike and Popeye Lakes). Surveyors recorded two pairs and 13 single birds on the surveyed plots, all in wetlands, plus five birds off the plots. They estimated that two pairs were breeding on their plots. 62), considerably higher than other recent estimates (Tibbitts et al. 2005, Morrison et al.