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

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

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