seanoe:58767 Proença Barbara Université de Bordeaux, France 2021-05-12 ISO 19115:2003/19139 1.0 Environmental, biomass and biotic interactions data of Spartina sp. niches in the Bay of Arcahon 2019-01-17 2021-05-12 Proença Barbara, Nez Tanya, Poli Armand, Ciutat Aurélie, Devaux Ludovic, Sottolichio Aldo, de Montaudouin Xavier, Michalet Richard (2019). Environmental, biomass and biotic interactions data of Spartina sp. niches in the Bay of Arcahon. SEANOE. https://doi.org/10.17882/58767 Questions: Invasiveness depends in part on the ability of exotic species to either exclude native dominants or to fill an empty niche. Comparisons of niches and effects of closely related native and invasive species enable the investigation of this topic. Does Spartina anglica invade European salt marshes through competitive exclusion of the native Spartina maritima or due to the occurrence of an empty ecological niche in highly anoxic conditions? Location: The Arcachon Bay (France). Methods: At three intertidal levels, we quantified competitive response and effect abilities of the two species through a cross-transplantation removal experiment. We also compared at three intertidal levels the biomass, root/shoot ratio, productivity and environmental conditions (elevation, salinity, potential redox and soil moisture) of salt marsh communities dominated by the exotic Spartina anglica or the native Spartina maritima. Results: Both established species showed similar biotic resistance to the invasion of the other species, but the exotic showed important intraspecific facilitation for growth. Species had similar niches and total biomass along a gradient of anoxic conditions, but the exotic had a much higher root/shoot ratio and productivity than the native. Owing to its rhizome density, the exotic showed a high ability to increase sediment oxygenation, likely to explain its important intraspecific facilitation. Conclusions: Our results showed that the invasion success of S. anglica cannot be explained by the competitive exclusion of the native or by its ability to fill an empty niche along a gradient of anoxia. Its behaviour as a self-facilitator invasive engineer is very likely to explain its rapid spread in the Bay and biotic resistance to the colonization of other congeneric species when established in dense patches. Additionally, we suggest that physical disturbance in the marsh communities dominated by the native S. maritima may disrupt its biotic resistance against the invasion of S. anglica. Proença Barbara Université de Bordeaux, France NEZ Tanya Northern Arizona University, USA Poli Armand Northern Arizona University, USA Ciutat Aurélie Université de Bordeaux, France Devaux Ludovic Université de Bordeaux, France SOTTOLICHIO Aldo Université de Bordeaux, France de Montaudouin Xavier Université de Bordeaux, France Michalet Richard Université de Bordeaux, France SEANOE https://www.seanoe.org/data/00476/58767/illustration.gif Biotic interactions Competitive effect Removal experiment Biological invasion Spartina anglica Spartina maritima Terrestrial Seagrass ODATIS aggregation parameters and Essential Variable names 2024-09-16 geonetwork.thesaurus.external.theme.NVS.OD1 Terrestrial SeaDataNet Parameter Disciplines 2021-04-07 geonetwork.thesaurus.external.parameter.NVS.P08 /Observational data/in-situ Type de jeux de donnée ODATIS 2024-10-15 geonetwork.thesaurus.local.theme.type_jeux_donnee CC-BY-NC-ND (Creative Commons - Attribution, No commercial usage, No modification) oceans -0.999547 -1.23414 44.611334 44.796219 XLS, XLSX https://www.seanoe.org/data/00476/58767/data/61310.r3_data.xlsx WWW:DOWNLOAD-1.0-link--download Raw data https://doi.org/10.17882/58767 WWW:LINK-1.0-http--metadata-URL DOI of the product https://www.seanoe.org/data/00476/58767/ rel-canonical Seanoe