Analysis of life table response experiments I. Decomposition of effects on population growth rate
1989; Elsevier BV; Volume: 46; Issue: 3-4 Linguagem: Inglês
10.1016/0304-3800(89)90019-7
ISSN1872-7026
Autores Tópico(s)Insurance, Mortality, Demography, Risk Management
ResumoLife table response experiments use the vital rates of an organism as the response variable in studies of the population-level response to environmental or biological factors. Demographic indices, particularly the asymptotic population growth rate λ (or r = ln λ), are commonly used as summary statistics to integrate the multifarious effects of the environmental factors on the life table. This raises the question of how to decompose the overall effect of a treatment on λ into contributions due to its effects on the individual survival and fertility rates. These contributions can be calculated from matrix projection models. Examples are presented, including a two-way factorial experiment in which both main effects and interactions are decomposed into contributions. In general, it cannot be assumed that large effects on the vital rates translate into large contributions to the effects on λ.
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