Danzabarma A. I. auteur aut IRD Hima K. auteur aut IRD Garba M. auteur aut IRD Issaka S. auteur aut IRD Dobigny Gauthier auteur aut IRD text journalArticle eng text/pdf reformatted digital access Expanding transportation infrastructure has facilitated the introduction and proliferation of invasive small mammals, particularly now cosmopolitan rodents like Rattus spp. and Mus musculus, within urban socio-ecosystems where they may severely impact local biodiversity, economy and public health. However, fine-scale dynamics of such biological invasions are still poorly documented, especially in African cities where such biological invasions are still ongoing. We took advantage of a long-term monitoring program of terrestrial small mammal communities of Niamey, the capital city of Niger, to compare rodent and shrew faunas at the same sampling points ten years apart, namely in 2009-2013 and in 2020-2023. We show that Rattus rattus has been expanding significantly in almost all trapping areas across the city, while Mastomys natalensis relative abundance has decreased. This clear trend of native-to-invasive rodent species turnover was particularly marked within the core city, but some notable exceptions exist in peripheral as well as traditionally built zones where the native species still remains dominant. These patterns are discussed, with special attention given to possible human socio-economic and health implications. specialized NIGER NIAMEY 082 102 080 20 7 e0325427 [13 p.] 2025 https://www.documentation.ird.fr/hor/fdi:010094903 10.1371/journal.pone.0325427 [F B010094903] https://www.documentation.ird.fr/hor/fdi:010094903 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2025-10/010094903.pdf IRD - Base Horizon / Pleins textes 2025-10-29 2025-11-04 fdi:010094903 fre