Journal of Ornithology

, Volume 149, Issue 4, pp 629–637

Breeding habitat selection of sympatric White-tailed, Rock and Willow Ptarmigan in the southern Yukon Territory, Canada

Original Article

Abstract

We examined breeding habitat selection at two scales for White-tailed (Lagopus leucura), Rock (L. muta), and Willow Ptarmigan (L. lagopus) at an alpine site in the Ruby Range Mountains of the Yukon Territory, Canada. To infer species-specific preferences, we used logistic regression and AIC model selection to compare nest habitat of White-tailed (n = 43) and Rock Ptarmigan (n = 58). Only descriptive statistics were used for Willow Ptarmigan (n = 8 nests) because of smaller sample sizes. Modeling results indicate elevation, slope, and the ground cover of graminoids and lichens were the main variables separating White-tailed and Rock Ptarmigan breeding habitat. Average estimates for elevation and slope around nest sites of each species followed a pattern of White-tailed Ptarmigan (1,827 m, 30°) > Rock Ptarmigan (1,728 m, 18°) > Willow Ptarmigan (1,512 m, 6°). White-tailed Ptarmigan tended to select drier habitats dominated by lichens, rock and dwarf shrubs, while Rock Ptarmigan were more common in meadows with graminoids and scattered woody shrubs. Willow Ptarmigan nested in areas with dense, woody shrubs. The three species display inter- and intraspecific territoriality, and while species-specific habitat preferences allow co-existence, the niche width of each is likely narrowed by the presence of congeners, particularly for White-tailed and Rock Ptarmigan. Within territories, all three species selected nest sites with more lateral cover than expected at random (24–50%). White-tailed and Rock Ptarmigan did not select specific cover types (vegetation or rock) for nest sites within territories, while most Willow Ptarmigan nests were located in patches of scrub birch (Betula glandulosa).

Keywords

Alpine tundra Interspecific competition Lagopus Nest habitat Ptarmigan 

Supplementary material

10336_2008_308_MOESM1_ESM.doc (53 kb)
Common dwarf shrub, woody shrub, forb and lichen species associated with rock, White-tailed and Willow Ptarmigan nesting habitat in the southern Yukon Territory (DOC 53 kb)

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Copyright information

© Dt. Ornithologen-Gesellschaft e.V. 2008

Authors and Affiliations

  1. 1.Department of Forest SciencesUniversity of British ColumbiaVancouverCanada
  2. 2.Canadian Wildlife ServiceDeltaCanada

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