Distribution and cover of a recently introduced alien sedge species, Carex pilulifera L., in the subalpine vegetation of Reunion Island

Boulesnane-Guengant Océane, Ajaguin Soleyen Cédric, Fenouillas Pauline, Caubit Margot, Dupont Joël, L'Horset Roxane, Rouget Mathieu. 2024. Distribution and cover of a recently introduced alien sedge species, Carex pilulifera L., in the subalpine vegetation of Reunion Island. BioInvasions Records, 13 (3) : 589-605.

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/85EKDH

Résumé : Carex pilulifera L., a perennial herb native to Europe, was recently introduced and found in subalpine vegetation of Reunion Island. In this study, we assessed the current distribution and cover of C. pilulifera within the subalpine vegetation (Piton des Neiges and Piton de la Fournaise) of the National Park of Reunion. We used GLM models to analyse relationships between C. pilulifera and habitat, disturbance type, and proximity to fodder and grazing areas. We evaluated the potential distribution of C. pilulifera using species distribution models. Presence of C. pilulifera was only found on Piton de la Fournaise with a mean cover of 16.6% (where present). Carex pilulifera was the fourth most observed alien species (27% of all observations). According to the SDM, it could also occur in Piton des Neiges but was not found. Carex pilulifera was significatively more present in subalpine grasslands and close to grazing and fodder areas. We believed fodder and grazing areas to be the introduction pathways of this species. This study confirmed the status of C. pilulifera as an invasive species in the subalpine vegetation of Reunion Island which comprises a high level of plant endemism. We suggest that management should primarily focus on surveying potentially suitable areas in Piton des Neiges to eradicate new introduction and to control the species within high biodiversity areas in Piton de la Fournaise.

Mots-clés Agrovoc : Carex, espèce envahissante, espèce introduite, biodiversité, plante herbacée, distribution géographique, mauvaise herbe de carex

Mots-clés géographiques Agrovoc : France, La Réunion

Mots-clés complémentaires : Carex pilulifera, invasion biologique

Mots-clés libres : Biological invasions, Plant invasion, Habitat preferences, Mountain ecosystems, Mascarene archipelago, Tropical oceanic islands

Classification Agris : H60 - Mauvaises herbes et désherbage

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement européennes : European Commission, European Agricultural Fund for Rural Development

Agences de financement hors UE : European Agricultural Fund for Rural Development, Conseil Régional de La Réunion, Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Auteurs et affiliations

• Boulesnane-Guengant Océane, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0009-0005-5090-6390 - auteur correspondant
• Ajaguin Soleyen Cédric, CIRAD-BIOS-UMR PVBMT (REU)
• Fenouillas Pauline, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0003-4944-8108
• Caubit Margot, Parc national de la Réunion (REU)
• Dupont Joël, SREPEN (REU)
• L'Horset Roxane, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0002-6328-2282
• Rouget Mathieu, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0002-6172-3152

Source : Cirad-Agritrop (https://agritrop.cirad.fr/611482/)

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