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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Influence of study scale on the characterisation of plants community organisation in a Mediterranean grassland (Mont Ventoux, France)
Auteurs :	Olivier Madon, Auteur ; Sophie Gachet, Auteur ; Marcel Barbero, Auteur
Type de document :	Article
Dans :	Ecologia Mediterranea (25(2) 1999)
Article en page(s) :	205-214
Résumé :	By sampling plant species in a Mediterranean grassland, the authors examine the influence of the study scale on: (i) the detection of ecological gradients by the correspondence analysis, and (ii) the validation of one of the two models: core-satellite hypothesis or Kolasa's model. These models concern the frequency distribution of species. The size of the quadrats varies from 1.56 to 100 m2. Results show that the study scale does not influence the detection of the principal ecological gradient. Nevertheless, species with high contribution to factorial axes change as study scale varies. Authors relate this fact to the abundance variability of individuals of a species according to the "point" of a gradient. On the other hand, results on a small scale are consistent with Kolasa's model, and on a large scale they are consistent with the core-satellite hypothesis. The discussion underlines the role of quadrats size in the characters "core" or "satellite", and the "saturation" of large quadrats in certain species. Whatever the scale, a large category of species are infrequent (present in few quadrats). This shows that the mechanisms which lead to a weak frequency of species (mass effect, survival in favourable patches...) are essential whatever the scale.

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