Individual energetics and the equilibrium demography of structured populations

Authored by RM Nisbet, E McCauley, WSC Gurney, DAJ Middleton, WW Murdoch, A DeRoos

Date Published: 1996

DOI: 10.1006/tpbi.1996.0017

Sponsors: United States Environmental Protection Agency (EPA) United States National Science Foundation (NSF)

Platforms: No platforms listed

Model Documentation: Other Narrative Mathematical description

Model Code URLs: Model code not found

Abstract

This paper considers the relationship between the demographic mechanisms of population control and the energetics of the individuals who comprise the population. We examine the equilibrium properties of a class of structured population models in which individuals compete for some environmental resource (such as food) and demonstrate that population demography is independent of the nature of the feed-back loop which establishes the equilibrium state. We thus derive general insights into the influence exerted by individual energetic and allocation strategies on population average demographic characteristics. We show that models of individual energetics which produce apparently very similar predictions al the individual level can result in very different behaviour at the population level. In addition, we observe that different models of individual mortality can imply marked differences in population demography and that the common assumption of constant mortality can be responsible for potentially unrealistic model behaviour. Our emphasise the substantial data requirements for parameterising and individual-based models. (C) 1996 Academic Press, Inc.

Tags

models growth Reproduction Daphnia Physiological ecology