Habitat quality ranking depends on habitat-independent environmental factors: a model and results from Callosobruchus maculatus

Détails

ID Serval
serval:BIB_C47BF7C9588B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Habitat quality ranking depends on habitat-independent environmental factors: a model and results from Callosobruchus maculatus
Périodique
Functional Ecology
Auteur(s)
Kawecki T.J.
ISSN
0269-8463
Statut éditorial
Publié
Date de publication
1997
Peer-reviewed
Oui
Volume
11
Numéro
2
Pages
247-254
Langue
anglais
Résumé
1. Survival and reproduction in different habitats of a heterogeneous environment are affected by intrinsic habitat properties as well as by habitat-independent extrinsic factors. It is argued that the ranking of habitats according to quality may depend on extrinsic environmental factors that act with the same intensity in all habitats. This can happen if, across habitats, high reproductive success in the absence of extrinsic mortality is coupled with late reproduction.
2. In a model of a semelparous organism with overlapping generations that uses two habitats, the effect of different patterns of extrinsic mortality on habitat quality are analysed, as measured by the reproductive: value of an egg, which estimates its expected contribution to the future gene pool.
3. Measurements of fitness components in Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) on four host species demonstrate that, across hosts, long development can be associated with high reproductive success in the absence of extrinsic mortality. As a result, the quality ranking of three out of the four hosts would be different in a stable population regulated by intraspecific competition and egg parasitoids than in a growing population or a stable population regulated by age-independent larval mortality.
4. It is suggested that habitat-independent mortality may play a role in the evolution of ecological niches.
Mots-clé
habitat choice, herbivorous insects, life history, niche evolution, predation
Web of science
Création de la notice
19/11/2007 11:47
Dernière modification de la notice
03/03/2018 21:13
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