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

By Jonathan Robert Bart, Victoria Helen Johnston

Each yr 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 probably the most efficient and pristine coasts anyplace. With rather a lot on hand nutrition 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 outstanding trend of flow and job has been the article of in depth learn through a world workforce of ornithologists who've spent a decade counting, surveying, and gazing those shorebirds. during this very important 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 vacationing shorebirds linger ahead of heading south? How fecund are those birds? the place precisely do they migrate and the place precisely do they go back? Are their populations turning out to be or shrinking? the result of this research are an important for higher realizing how environmental regulations will impact Arctic habitats in addition to the far-ranging iciness habitats utilized by migratory shorebirds.

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We therefore used the combined approach to reduce the bias, even though this means that the estimated population size for a region with several strata does not equal the sum of the stratum-specific estimates. The combined approach yields somewhat larger SEs than using the separate approach but much smaller bias. We consider the approach “conservative” in that sense. CONCLUSION When we began the study we expected to use distance, double-observer, or some other welldeveloped method for estimating detection rates and obtaining unbiased estimates of population size.

Seven nests or probable nests, 77 pairs, and 60 singles were recorded on the YDSA, almost exclusively in wetlands, while only a single pair was observed on the SSA. The estimated number of pairs breeding on the surveyed plots was 118. 24), respectively. Prior estimates in the same area ranged from Ͼ 100/km2 in wet coastal saltgrass meadows to 4/km2 Ͼ 2 km inland in moist dwarf shrub mat tundra (Handel and Gill 1992). 25). This estimate is a significant fraction of the estimated global population of 95,000 (Handel and Gill 1992, Morrison et al.

S. Geological Survey, primarily on federal lands (including National Parks, National Wildlife Refuges, and on Bureau of Land Management holdings). Most of these studies were characterized by the use of 10 km ϫ 10 km sample units within large geographical areas, count points with detection probabilities estimated through distance sampling, stratified random designs, and a primary focus on upland and montane habitats (Tibbitts et al. 2005, Ruthrauff et al. 2007, Ruthrauff and Tibbitts 2009). These habitats typically supported very different shorebird communities than the small, local plot studies described in the preceding paragraph.

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