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Variability in the settlement of non-indigenous species in benthic communities from an oceanic island
Authors:Léa Riera  Patrício Ramalhosa  João Canning-Clode  Ignacio Gestoso
Affiliation:1.Faculté des Sciences,Université Montpellier II,Montpellier,France;2.MARE – Marine and Environmental Sciences Centre,Quinta do Lorde Marina,Cani?al, Madeira Island,Portugal;3.OOM- Oceanic Observatory of Madeira,Agência Regional para o Desenvolvimento da Investiga??o Tecnologia e Inova??o,Funchal, Madeira,Portugal;4.Department of Oceanography and Fisheries/UAz,Centre of IMAR of the University of the Azores,Horta, Azores,Portugal;5.Smithsonian Environmental Research Center,Edgewater,USA
Abstract:The introduction of non-indigenous species (NIS) in new environments represents a major threat for coastal ecosystems. A good understanding of the mechanisms and magnitude of the impact of NIS colonisation on native ecosystems is becoming increasingly crucial to develop mitigation measures and prevent new invasions. In this present study, we asked if distinct coastal benthic communities from an oceanic island can have different vulnerability to NIS colonisation process. First, PVC settlement plates were deployed for 1 year on the rocky shore of two different locations of Madeira Island (North versus South coast). Then, we implemented a mesocosm experiment where recruited plate communities were maintained under different levels of NIS propagule pressure in order to assess their vulnerability to NIS colonisation process. Results showed that NIS colonisation success was not influenced by the level of propagule pressure, but however, final colonisation patterns varied depending on the origin of the communities. This variability can be attributed to major structural differences between the preponderant species of each community and therefore to the biotic substrate they offer to colonisers. This study highlights how biotic features can alter the NIS colonisation process and importantly, shows that in an urbanisation context, the nature of the resident communities facing invasions risks needs to be closely assessed.
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