Arctic Shorebirds in North America : a Decade of Monitoring - download pdf or read online

By Jonathan Robert Bart, Victoria Helen Johnston

ISBN-10: 0520273109

ISBN-13: 9780520273108

ISBN-10: 0520953495

ISBN-13: 9780520953499

Each yr shorebirds from North and South the United States migrate millions of miles to spend the summer season within the Arctic. There they feed in coastline marshes and estuaries alongside probably the most effective and pristine coasts anyplace. With rather a lot to be had nutrition they may be able to reproduce virtually explosively; and as iciness methods, they retreat south besides their offspring, to come to the Arctic the next spring. This notable trend of circulation and job has been the item of in depth learn through a world group of ornithologists who've spent a decade counting, surveying, and staring at those shorebirds. during this very important man made paintings, they tackle a number of questions about those migratory chicken populations. what number birds occupy Arctic ecosystems every one summer time? How lengthy do vacationing shorebirds linger prior to heading south? How fecund are those birds? the place precisely do they migrate and the place precisely do they go back? Are their populations growing to be or shrinking? the result of this learn are an important for larger realizing how environmental regulations will impression Arctic habitats in addition to the far-ranging wintry weather habitats utilized by migratory shorebirds.

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Additional info for Arctic Shorebirds in North America : a Decade of Monitoring

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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.

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Arctic Shorebirds in North America : a Decade of Monitoring by Jonathan Robert Bart, Victoria Helen Johnston

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