Quantifying invasion degree by alien plants species in Reunion Island

Fenouillas Pauline, Ah‐Peng Claudine, Amy Elise, Bracco Isabelle, Dafreville Stéphanie, 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. 2021. Quantifying invasion degree by alien plants species in Reunion Island. Austral Ecology, 46 (7) : 1125-1137.

https://doi.org/10.1111/aec.13048

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Url - jeu de données - Entrepôt autre : https://www.especesinvasives.re/en-pratique/documents-et-outils/article/documents-et-outils

Quartile : Q4, Sujet : ECOLOGY

Résumé : The largest area of intact vegetation in the Mascarene's archipelago is found on Reunion Island, but the remaining natural areas are under threats. Biological invasions are one of the main threats to biodiversity loss on this island and globally worldwide. This study aimed to quantify invasion degree by alien plants species in Reunion Island. This work was possible thanks to a large partnership between researchers and managers. All existing spatial data on invasion pattern were combined and completed by expert knowledge to develop the first 250 x 250 m map of invasion degree at the island scale. To fill the gaps where no field survey data or expert knowledge was available, we used a Random Forest model using nine climatic, landscape and anthropogenic variables. This model also provides a preliminary assessment of drivers of invasion at Reunion Island. Results showed that 85% of the extant native vegetation was invaded in different proportions; 38% are slightly invaded, 26% moderately invaded and 22% very heavily invaded. Despite the high levels of invasion in some places, more than 50% of the extant vegetation is not invaded or slightly invaded. Most of the invaded areas are located in the lowland and in the leeward coast although alien plants invade all types of vegetation from the coast to the top of the island. These results highlight a clear increase in the distribution of alien species over time. This study constitutes a key first step for about the ongoing prioritisation of management interventions on Reunion Island.

Mots-clés Agrovoc : espèce envahissante, cartographie, données spatiales, modélisation environnementale, organisme nuisible, distribution des populations

Mots-clés géographiques Agrovoc : La Réunion

Mots-clés libres : Invasion degree, Invasive alien plants, Mapping, Mascarenes, Random forest

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

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