La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Floristic evolution around the Grammont pond (Montpellier, Southern France) from one century: Disappearance of Isoetes setacea Lam (1998)
Auteurs :	Cécile Le Dantec, Auteur ; Jean-Pierre Suc, Auteur ; Danica Suballyova, Auteur ; Jean-Louis Vernet, Auteur ; Séverine Fauquette, Auteur ; Michel Calleja, Auteur
Type de document :	Article
Dans :	Ecologia Mediterranea (24(2) 1998)
Article en page(s) :	159-170
Résumé :	The flora of the Grammont pond, a historical locality with Isoetes setacea Lam., and of the surrounding area have been examined five times since 1767. Three of these inventories concerned approximately the last 100 years. Results of the record in 1994 are compared to the spore-pollen flora from the pond's surface sediment. As a consequence, eight older spore-pollen spectra recorded along a core of 60 cm length appear representative of the vegetation evolution. The disappearance of Isoetes setacea, which occurred around the year 1950, is well recorded in the spore-pollen analyses which confirms an important transformation of the already modified ecosystem. The spore-pollen record and geochemical analyses provide information about the complex causes of the disappearance of Isoetes. Several actions are proposed before its possible resowing.

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