| Titre : | Intra- an interannual vegetation dynamics in the ponds of the Roque-Haute nature reserve: Program of study and preliminary results (1998) |
| Auteurs : | Patrick Grillas, Auteur ; Laurine Tan Ham, Auteur |
| Type de document : | Article |
| Dans : | Ecologia Mediterranea (24(2) 1998) |
| Article en page(s) : | 215-222 |
| Résumé : | The species richness of vegetation and the occurrence of rare species are characteristic features of Mediterranean temporary pools. The vegetation of temporary pools has often been described in the Mediterranean region but few studies have concentrated on the dynamics and its control by abiotic and biotic factors. The objectives of this project on the Roque-Haute Nature Reserve are to study (1) the relationships between the species composition of pools and the intra- and inter-annual hydrological characteristics, (2) the impact of various disturbances on the long-term dynamics of vegetation. The reserve contains about 200 pools with contrasting hydrological and ecological situations. During the first phase of the project (3 years) the intra- and inter-annual vegetation dynamics will be studied on a sample of 21 pools on Roque-Haute Nature Reserve. The project includes a detailed hydrological analysis of the pool and the establishment of an hydrological model. The first phase started in 1996 with a monthly survey of vegetation from May to August on a sample of 21 pools selected at random according to a previous classification. Preliminary results of the first year's observations reveal that the species richness of the pools was not correlated with the length of the transects nor with the number of quadrats. The pool classification by Molina was confirmed by the floristic data analysis. The species composition of the living vegetation was significantly modified during the observation period while pools were drying up. The management of the area should take into account the vegetation dynamics and the role of disturbance factors. |
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