The Impact of the Neophyte Tree Fraxinus pennsylvanica [Marshall] on Beetle Diversity under Climate Change

We studied the impact of neophyte tree Fraxinus pennsylvanica on diversity beetles in floodplain forests along river Elbe Germany 2016, 2017 and 2020, where 80% all excelsior trees had died following severe droughts. Beetles were collected by insecticidal knock-down from 121 (64 F. 57 pennsylvanica) identified to 547 species 15,214 specimens. The sampled 2016 showed no signs drought stress or ash dieback serve as a reference for comparison with 2020 fauna. data proved that harbours most diverse beetle community, which differed also significantly guild composition pennsylvanica. Triggered extremely dry long summer seasons, profound forest-wide impacts. Several endangered, red-listed Saxonia Anhalt increased numbers became secondary pests excelsior. Diversity decreased whilst xylobionts trees, reaching 78% Proportions remained constant Phytophages almost absent but mycetophages Our suggest result might become rescue European Ash fauna, it provides second-best habitat. show how difficult is assess dynamics ecological neophytes, especially under conditions similar those projected climate change models. abundance canopy arthropods demonstrates their importance understanding forest functions maintenance ecosystem services, illustrating consideration essential adaptation change.