Nesting Habitat Selection and Hatching Success of Whimbrels Near Churchill, Manitoba, Canada

摘要: Abstract. The Whimbrel (Numenius phaeopus) is one of a suite sub-arctic- and arctic-nesting shorebirds for which encroachment woody vegetation into previously open habitats may cause reduction in breeding habitat. nesting habitat selection was studied at two spatial scales near Churchill, Manitoba, Canada, to determine preferences the degree species avoided vegetation. Whimbrels occupied sites mesohabitat (territory) scale characterized by either high lichen cover, or graminoid standing water cover. No nested with >17.5% tall shrub only pair where >38 trees existed within 30 m nest. At microhabitat (nest) scale, distinct habitats. In lichen-dominated sites, nests had less concealing than unused whereas dominated habitats, were more concealed sites. Sixty-eight percent on hummocks ridges. Hat...