The role of invasive species in the network of the Mediterranean ecosystem dominated by sclerophyllous vegetation of central Chile
摘要
The sclerophyllous ecosystem of central Chile is a global biodiversity hotspot characterized by high levels of endemism and multiple anthropogenic threats, including biological invasions. Understanding how invasive species are embedded within trophic networks provides a system-level perspective to inform conservation and management strategies. Here, we reconstructed a literature-based trophic network of the Chilean Mediterranean ecosystem by compiling documented species distributions and trophic interactions. We evaluated network structure and used centrality metrics to assess the relative embeddedness and connectivity of exotic species within the trophic framework. The network comprised 252 nodes and 798 trophic interactions, with 63% basal, 33% intermediate, and 4% top trophic levels. Several exotic species were highly connected, including the European rabbit (Oryctolagus cuniculus), domestic dog (Canis lupus familiaris), commensal rodents (Rattus rattus, Mus musculus), and California quail (Callipepla californica), indicating their integration across multiple trophic levels. Among these, the European rabbit exhibited the highest connectivity, linking a wide range of plant species and a large proportion of predators, highlighting its dual role as both consumer and prey. Overall, our findings demonstrate that multiple co-occurring invasive species are structurally embedded within the trophic network and may influence ecosystem dynamics through interconnected pathways. This network-based approach provides a framework to identify species with high structural connectivity and supports the development of integrated, multi-species management strategies.
Graphical Abstract