Every year shorebirds from North and South the US migrate millions of miles to spend the summer season within the Arctic. There they feed in coastline marshes and estuaries alongside the most efficient and pristine coasts wherever. With quite a bit to be had meals they may be able to reproduce virtually explosively; and as wintry weather techniques, they retreat south besides their offspring, to come to the Arctic the subsequent spring. This outstanding development of move and task has been the thing of in depth learn by way of a world group of ornithologists who've spent a decade counting, surveying, and gazing those shorebirds. during this vital man made paintings, they deal with a number of questions on those migratory poultry populations. what number birds occupy Arctic ecosystems each one summer season? How lengthy do traveling 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 starting to be or shrinking? the result of this research are an important for larger figuring out how environmental rules will impression Arctic habitats in addition to the far-ranging iciness habitats utilized by migratory shorebirds.
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Every year shorebirds from North and South the US migrate hundreds of thousands of miles to spend the summer season within the Arctic. There they feed in coastline marshes and estuaries alongside one of the most effective and pristine coasts anyplace. With a lot to be had foodstuff they may be able to reproduce nearly explosively; and as wintry weather techniques, they retreat south besides their offspring, to come back to the Arctic the next spring.
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Extra resources for Arctic Shorebirds in North America: A Decade of Monitoring (Studies in Avian Biology, Volume 44)
Other densities were markedly lower. 35) in the Alaska Maritime, Alaska Peninsula, Yukon Delta, and Selawik study areas, respectively. The former two estimates were affected by selection bias of unknown magnitude and so should be regarded with caution. A small estimate was generated for the Yukon Delta study area because it covered only about 1% of the Yukon Delta NWR. We identify several speciesspecific estimates from our study which appear inconsistent with previous continental estimates. This pilot study provides preliminary estimates of species composition and density in the surveyed areas.
Chapter 2, this volume). To estimate densities in birds/km2, we doubled the number of indicated pairs/km2. We provide a table summarizing densities and population sizes for all species combined and those detected in at least three of our study areas. Another summarizes observations by study area and habitat for most species with at least one estimated pair on plots in at least two study areas. We report additional results in the text. RESULTS Detection Ratios We had only two intensive camps in western Alaska, both in the YDSA.
On the SSA, the failure to find nesting birds on intensive plots was tentatively attributed to sampling too late in the season. Late surveys might also explain the high densities of Whimbrels. A species already prone to approaching observers 32 STUDIES IN AVIAN BIOLOGY during the incubation period, brood-tending Whimbrels are also known to jointly mob human observers and predators; territorial borders are not respected during brood-rearing, so that multiple pairs can rapidly converge on a predator or human observer from hundreds of meters away.