Influence of life history strategies on sensitivity, population growth and response to climate for sympatric alpine birds

Table 1 Asymptotic matrix properties for rock and white-tailed ptarmigan (values are the point estimates based on a deterministic model)

Matrix property	Rock ptarmigan	White-tailed ptarmigan
Asymptotic population growth rate (λ)	1.013	0.957
Stable age distribution (w):	0.39/0.61	0.55/0.45
(second year/after second year)
Weighted reproductive value (v):	1.00/1.09	1.00/1.14
(second year/after second year)
Net reproductive rate (Ro)	1.036	0.919
Generation time (T)	2.61	1.90

ISSN: 1472-6785