Eros T. auteur aut IRD Comte L. auteur aut IRD Filipe A. F. auteur aut IRD Ruhi A. auteur aut IRD Tedesco Pablo auteur aut IRD Brose U. auteur aut IRD Fortin M. J. auteur aut IRD Giam X. auteur aut IRD Irving K. auteur aut IRD Jacquet C. auteur aut IRD Larsen S. auteur aut IRD Sharma S. auteur aut IRD Olden J. D. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Despite the increasing ubiquity of biological invasions worldwide, little is known about the scale-dependent effects of nonnative species on real-world ecological dynamics. Here, using an extensive time series dataset of riverine fish communities across different biogeographic regions of the world, we assessed the effects of nonnative species on the temporal variability and synchrony in abundance at different organizational levels (population, metapopulation, community and metacommunity) and spatial scales (stream reach and river basin). At the reach scale, we found that populations of nonnative species were more variable over time than native species, and that this effect scaled up to the community level - significantly destabilizing the dynamics of riverine fish communities. Nonnative species not only contributed to reduced community stability, but also increased variability of native populations. By contrast, we found no effect of nonnative species dominance on local interspecific synchrony among native species. At the basin scale, nonnative metapopulations were again more variable than the native ones. However, neither native metapopulations nor metacommunities showed differences in temporal variability or synchrony as nonnative species dominance increased basin-wide. This suggests a 'dilution effect' where the contribution to regional stability of local native populations from sites displaying low levels of invasion reduced the destabilizing effects of nonnative species. Overall, our results indicate that accounting for the destabilizing effect of nonnative species is critical to understanding native species persistence and community stability. specialized abundance fluctuations biological invasions interspecific synchrony metacommunity temporal variability time-series ETATS UNIS CANADA EUROPE AUSTRALIE 034 020 43 8 1156-1166 2020 0906-7590 https://www.documentation.ird.fr/hor/fdi:010079065 10.1111/ecog.04985 0906-7590 [F B010079065] https://www.documentation.ird.fr/hor/fdi:010079065 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-05/010079065.pdf IRD - Base Horizon / Pleins textes 2020-06-09 2025-02-24 fdi:010079065 fre