Summary: Akçakaya, H.R. 2000. Population viability analyses with demographically
and spatially structured models. Ecological Bulletins 48:23-38.
This is a preprint of Akçakaya, H.R. 2000. Population viability analyses with
demographically and spatially structured models. Ecological Bulletins 48:23-38.
Population Viability Analyses with Demographically and
Spatially Structured Models
H. Reit Akçakaya
This paper presents a review of demographically structured (or, frequency-based) models, in which the
individuals in a population are grouped into distinct classes. Structured models are used when vital
rates (survival, reproduction, dispersal) of individuals depend on their age or
physiological/morphological stage. Variation in these rates (environmental stochasticity) and the
effect of abundance (density dependence) are important factors that determine population viability.
Metapopulation models are built by adding information about spatial structure (number of populations,
and the location, size, shape, and quality of habitat patches they inhabit). At the metapopulation level,
the similarity of environmental fluctuations (correlation) and dispersal among patches become
important variables determining viability. These modeling methods can be combined with habitat
analyses that link landscape data with metapopulation models.
H. R. Akçakaya (email@example.com), Applied Biomathematics, 100 North Country Road, Setauket, New
York 11733, USA