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Quantify invasion levels by alien plant species in La Reunion Island

Fenouillas Pauline, Amy Elise, Bracco Isabelle, Gosset Mélodie, Ingrassia Florent, Lavergne Christophe, Lequette Benoit, Notter Jean-Cyrille, Pausé Jean-Marie, Payet Guillaume, Payet Nicolas, Picot Frédéric, Poungavanon Nila, Strasberg Dominique, Thomas Hermann, Triolo Julien, Turquet Vincent, Rouget Mathieu. 2019. Quantify invasion levels by alien plant species in La Reunion Island. In : Book of abstracts posters of the third international conference on Island ecology, evolution and conservation. Flores Olivier (ed.), Ah-Peng Claudine (ed.), Wilding Nicholas (ed.). Université de la Réunion. Saint-Denis : Université de la Réunion, Résumé, p. 74. International conference on Island ecology, evolution and conservation. 3, Saint-Denis, Réunion, 8 July 2019/13 July 2019.

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Abstract : The largest area of intact vegetation in the Mascarene Archipelago is found on La Reunion Island. In 2007, a national park has been established where most protected habitats and rare species are targeted by some conservation actions. Invasions by exotic plants are the main threat to the biodiversity within this park and several management programs aim at controlling the main invasive alien plant species. For decades, inventories of alien species have been carrying out at La Reunion, constituting a large amount of data but these data never been synthetized, assembled and exploited to assess the level of invasion. Here, data from different organizations were combined to quantify the overall level of invasion by exotic plants island-wide. These data were extrapolated to grid cells of 250 x 250 m and categorized into four invasion categories ranging from intact to heavily invaded areas. Here, we present the spatial pattern of invasion on La Reunion Island. Only 12% of the island remain intact while 60%is moderately to heavily invaded. Inside the national park, more than 55% is lightly invaded or intact. We then discuss the invasion rate according to several factors: altitude, habitats, geomorphology, land cover and the presence of pathways or streams.

Auteurs et affiliations

  • Fenouillas Pauline, CIRAD-BIOS-UMR PVBMT (REU)
  • Amy Elise, Parc national de la Réunion (REU)
  • Bracco Isabelle, DAF (Réunion) (REU)
  • Gosset Mélodie, DEAL (REU)
  • Ingrassia Florent, ONF (REU)
  • Lavergne Christophe, CBN-CPIE Mascarin (REU)
  • Lequette Benoit, Parc national de la Réunion (REU)
  • Notter Jean-Cyrille, Parc national de la Réunion (REU)
  • Pausé Jean-Marie, Parc national de la Réunion (REU)
  • Payet Guillaume, Université de la Réunion (REU)
  • Payet Nicolas, Université de la Réunion (REU)
  • Picot Frédéric, CBN-CPIE Mascarin (REU)
  • Poungavanon Nila, GCEIP (REU)
  • Strasberg Dominique, Université de la Réunion (REU)
  • Thomas Hermann, Parc national de la Réunion (REU)
  • Triolo Julien, ONF (REU)
  • Turquet Vincent
  • Rouget Mathieu, CIRAD-BIOS-UMR PVBMT (REU)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/594139/)

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