Population density and optimal body size.

Détails

ID Serval
serval:BIB_9133324C8638
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Population density and optimal body size.
Périodique
Mémoire de la Société Vaudoise des Sciences Naturelles
Auteur(s)
Perrin N.
ISSN
0037-9611
Statut éditorial
Publié
Date de publication
1990
Volume
18
Numéro
3
Pages
169-179
Langue
anglais
Notes
IDD8288847B59D_
In: Modèles dynamiques en biologie, R.Arditi (dir.)
Résumé
The population density of an organism is one of the main aspects of its environment, and shoud therefore strongly influence its adaptive strategy. The r/K theory, based on the logistic model, was developed to formalize this influence.
K-selectioon is classically thought to favour large body sizes. This prediction, however, cannot be directly derived from the logistic model: some auxiliary hypotheses are therefor implicit. These are to be made explicit if the theory is to be tested. An alternative approach, based on the Euler-Lotka equation, shows that density itself is irrelevant, but that the relative effect of density on adult and juvenile features is crucial. For instance, increasing population will select for a smaller body size if the density affects mainly juvenile growth and/or survival. In this case, density shoud indeed favour large body sizes. The theory appears nevertheless inconsistent, since a probable consequence of increasing body size will be a decrease in the carrying capacity
Mots-clé
body-size, density-dependent selection, optimization life-history theory
Création de la notice
24/01/2008 18:54
Dernière modification de la notice
20/08/2019 15:54
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