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UBC Theses and Dissertations

A study of the life history and population dynamics of the sooty grouse, "dendragapus obscurus fuliginosus" (Ridgway) Bendell, James Francis S.


A population of sooty grouse (Dendragapus obscurus fuliginosus) has been studied on its summer range over the years 1950 to 1953. Data on moult, aging criteria, weight and behaviour are presented as life history. Some of these data are utilized in a consideration of the present population status of grouse on the study area. Mortality, productivity, emigration and immigration, have been studied as factors influencing population size and status. The population is apparently stable, a result of an equilibrium between death in the older age classes and replacement by surviving young. Disease is an important mortality factor in the chicks and a major factor affecting population size and stability.

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