Changes in native and introduced host–parasite networks

Abstract Introduced species can alter the dynamics and structure of a native community. Network analysis provides tool to study host–parasite interactions that help predict possible impact biological invasions or other disturbances. In this study, we used weighted bipartite networks assess differences in interaction patterns between hosts helminth parasites (Sea Japan) invasive (Black Sea Azov) populations Planiliza haematocheilus (Teleostei: Mugilidae). We employed three quantitative network descriptors, connectance, nestedness modularity, gain insight into invaded areas. The role parasite was assessed using betweenness centrality index. analyzed encompassing whole community subsets classified by their transmission strategy. analyses were downscaled host individual-level consider intraspecific variation communities. found significant latter presented higher value nestedness, which may indicate co-occurrence with many connections fewer within same individual-host. addition, modularity area’s than those area, subgroups individuals interact more frequently certain others. Only composed actively transmitted ectoparasites did not show Azov Japan, could be due introduction part environment, lower diversity abundance species. valuable illuminate changes occur when an its are introduced new area.