Contrasted responses of dominant ground-dwelling arthropods to landscape salt-marsh fragmentation

Autor: Charlène Puzin, Julien Pétillon
Přispěvatelé: Universiteit Gent = Ghent University [Belgium] (UGENT), Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Agence de l'eau Loire-Bretagne Région Bretagne ARED 7023, Universiteit Gent = Ghent University (UGENT), Université de Rennes (UR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Estuarine, Coastal and Shelf Science
Estuarine, Coastal and Shelf Science, Elsevier, 2019, 224, pp.138-141. ⟨10.1016/j.ecss.2019.05.002⟩
Estuarine, Coastal and Shelf Science, 2019, 224, pp.138-141. ⟨10.1016/j.ecss.2019.05.002⟩
ISSN: 0272-7714
1096-0015
DOI: 10.1016/j.ecss.2019.05.002⟩
Popis: International audience; In spite of their highly patchy distribution, the effects of landscape configuration on specialist biodiversity has been little studied in salt marshes. We investigated the impact of patch size on the abundance of specialist arthropods in two contrasted salt-marsh environments. Dominant ground-active species were sampled by pitfall traps in increasing areas of natural vegetation (dominated by Atriplex portulacoides)along two transects surrounded by either grazed (dominated by Puccinellia maritima)or invasive (dominated by Elymus athericus)vegetation. Spatially- and temporally-replicated sampling took place in the Mont Saint-Michel Bay (Western France)during 2012. Three dominant species, the wolf spider Pardosa purbeckensis (Araneae, Lycosidae), the ground beetle Pogonus chalceus (Coleoptera, Carabidae)and the beach-hopper Orchestia gammarellus (Amphipoda, Talitridrae), constituted 96% of all arthropods caught (N = 66,299). Patch size only had an effect on the carabid and on the amphipod, with large patches more populous than small ones, reinforcing the idea that the effects of fragmentation are stronger for species with limited mobility. Environment had a significant effect on the population density of all species, with systematically more individuals in patches surrounded by invaded than by grazed salt marshes, which confirms the particularly negative impact of over-grazing on salt-marsh biodiversity. This study finally suggests that both invasive species and grazing impact salt-marsh biodiversity also at a landscape scale.
Databáze: OpenAIRE
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