Recovery of mesofauna after volcanic disturbances on Reunion Island - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2018

Recovery of mesofauna after volcanic disturbances on Reunion Island

Résumé

Natural recolonization of disturbed environments is a key issue for the maintenance of biodiversity, especially in a context of habitats threatened by exotic species. Recolonization by collembola of habitats destroyed by lava flows has never been documented. These soil-dwelling arthropods provide an essential basis for the functioning of terrestrial ecosystems. Our objective was to answer the following questions: Which habitats (forests, crops) serve as sources for collembola recolonization? Do exotic plant species influence this recolonization? Which traits allow rapid recolonization? Our study was performed in the Reunion island, where several habitats have been destroyed by lava flows and where 3500 introduced plant species threaten the functioning of ecosystems. Collembola were collected from soil, litter, herbaceous layer, moss and tree bark sampled from different habitats (lava flows, forests and sugarcane fields). They were identified at the species or morphospecies level. Their functional traits were measured. For the first time collembolan species were inventoried in forests, crops and lava flows on Reunion Island: 56 species and morpho-species belonging to 12 families were observed. Species richness was increased in crops and forests compared to lava flows indicating that recolonization was incomplete. Our results show that the recolonization of habitats destroyed by lava flows depends on many factors that differ according to the considered micro-habitat (vertical stratum). Colonization was a function of the percentage of exotic plants, the distance to the nearest forest and the age of lava flow, in herbaceous layer, soil and litter, respectively. Dominant functional traits observed in lava flows were those belonging to edaphic species. The rapidity with which edaphic species colonized lava flows, added to the observation of many of these species on tree trunks, suggests that they could have benefited from air transport for settlement in lava flows.
Fichier principal
Vignette du fichier
Poster-La Réunion- Tropical Ecology 03-18.pdf (1.64 Mo) Télécharger le fichier
poster.jpg (350.44 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03902147 , version 1 (29-12-2022)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

  • HAL Id : hal-03902147 , version 1

Citer

Sandrine Salmon, Maxime Villers, Adji-Ami Diop, Cyrille d'Haese, Jean-François Ponge, et al.. Recovery of mesofauna after volcanic disturbances on Reunion Island. European Conference of Tropical Ecology, Mar 2018, Paris, France. . ⟨hal-03902147⟩
92 Consultations
14 Téléchargements

Partager

Gmail Facebook X LinkedIn More