Morand S., Guégan Jean-François. (2000). Distribution and abundance of parasite nematodes : ecological specialisation, phylogenetic constraint or simply epidemiology ?. Oikos, 88, p. 563-573. ISSN 0030-1299.
Titre du document
Distribution and abundance of parasite nematodes : ecological specialisation, phylogenetic constraint or simply epidemiology ?
Année de publication
2000
Type de document
Article
Auteurs
Morand S., Guégan Jean-François
Source
Oikos, 2000,
88, p. 563-573 ISSN 0030-1299
We investigate the patterns of abundance-spatial occupancy relationships of adult parasitic nematodes in mammal host populations (828 populations of nematodes from 66 different species of terrestrial mammals). A positive relationship between mean parasite abundance and host occupancy, i.e. prevalence, is found which suggests that local abundance is linked to spatial distribution across species. Moreover, the frequency distribution of the parasite prevalence is bimodal, which is consistent with a core-satellite species distribution. In addition, a strong positive relationship between the abundance (log-transformed) and its variance (log-transformed) is observed, the distribution of worm abundance being lognormally distributed when abundance values have been corrected for host body size. Hanski et al. proposed three distinct hypotheses, which might account for the positive relationship between abundance and prevalence in free and associated organisms: 1) ecological specialisation, 2) sampling artefact, and 3) metapopulation dynamics. In addition, Gaston and co-workers listed five additional hypotheses. Four solutions were not applicable to our parasitological data due to the lack of relevant information in most host-studies. The fifth hypothesis, i.e. the confounded effects exerted by common history on observed patterns of parasite distributions, was considered using a phylogeny-based comparison method... (D'après résumé d'auteur)
Plan de classement
Ecologie / Ethologie [080ZOOGEN03]
Descripteurs
NEMATODE ; RELATION HOTE PARASITE ; PREVALENCE ; DISTRIBUTION SPATIALE ; ABONDANCE ; CORRELATION ; SPECIALISATION ; DYNAMIQUE DE POPULATION ; ECOLOGIE DES PARASITES ; PHYLOGENIE ; MODELISATION ; ETUDE COMPARATIVE
