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

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 hundreds of thousands of miles to spend the summer time within the Arctic. There they feed in coastline marshes and estuaries alongside essentially the most effective and pristine coasts wherever. With loads to be had foodstuff they can reproduce nearly explosively; and as wintry weather methods, they retreat south besides their offspring, to come back to the Arctic the subsequent spring. This amazing trend of flow and task has been the thing of in depth research by means of a world crew of ornithologists who've spent a decade counting, surveying, and gazing those shorebirds. during this very important artificial paintings, they handle a number of questions on those migratory poultry populations. what number birds occupy Arctic ecosystems every one summer season? How lengthy do traveling shorebirds linger earlier than 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 the most important for higher realizing how environmental guidelines will impression Arctic habitats in addition to the far-ranging wintry weather habitats utilized by migratory shorebirds.

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Elphick, P. Geissler, C. Handel, R. Stehn, and two anonymous reviewers provided detailed comments on the method in 2005 in a peer review plan organized by B. Peterjohn. Their comments led to many improvements in the method. Discussions about how best to conduct the surveys were held more or less continuously in the camps and helped identify problems, especially logistic ones that we later addressed through changes in the design. These people are too numerous to list here but are acknowledged in later chapters.

3 was subdivided into two clusters. Plots were surveyed a single time during the first two weeks of June in 2001 or 2002. , chapter 2, this volume). At one of the locations, the surrounding area was classified as wetland or upland and two 10-ha plots were randomly selected in each stratum. At the other location, a single 16-ha plot was selected. These plots were surveyed using the intensive methods described in Bart et al. (chapter 2, this volume). In the SSA, a single large site was selected. It covered 15,170 km2 including most of the Selawik NWR and some additional areas (Fig.

R. Ely, pers. , B. J. McCaffery pers. ). A few isolated pairs were reported from the sand dunes in the vicinity of Dall Point north of Hooper Bay (Brandt 1943). 20), somewhat higher than a site-specific estimate within our study area of 40/km2 from the mouth of the Tutakoke River, but lower than estimates of local densities from multiple wetland sites on the Seward Peninsula to the north of the Yukon– Kuskokwim Delta, which ranged from 101 to 268 birds/km2 (Kessel 1989, Gill and Handel 1990). 60) was still lower than that reported from either the Seward Peninsula or the YDSA (this study).

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

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