Ruffino L. auteur aut IRD Russell J. C. auteur aut IRD Pisanu B. auteur aut IRD Caut S. auteur aut IRD Vidal Eric auteur aut IRD text journalArticle eng text/pdf born digital access The ability of invasive mammals to adjust their diet in response to new or variable resources is often proposed to explain their invasion success on islands with differing environmental conditions, especially islands with strong spatiotemporal changes in the nature and abundance of their resources. In this study, we investigated how habitat heterogeneity and seasonal fluctuation in resource quality affect dietary breadth and plasticity in an island-invasive rodent, the black rat Rattus rattus, on a small Mediterranean island. We tested for dietary plasticity of rats at both the individual and population levels by using traditional dietary and stable isotope analyses at successively increasing time scales, coupled with a long-term study of individual rats in three habitats of close proximity. Dietary and movement analyses both indicated that R. rattus is able to exploit a wide range of resources and habitats. However, dietary plasticity and habitat breadth were far narrower at the individual level. Results revealed that rats exclusively used resources found in their local habitat, and very few individuals moved among adjacent habitats in pursuit of higher-quality resources, despite those resources being abundant in their immediate environment. This counterintuitive finding suggests that intraspecific interactions must restrict rat mobility. Our results suggest that even on small islands, accessibility of patchy and high-quality resources to individuals from the entire population is not systematic. This result has important implications when quantifying invasive rodent impacts on patchily distributed species, especially when studies use indirect methods such as dietary analyses as a substitute for direct observations of predatory behavior. specialized Alien invasive rodents Capture-mark-recapture Dietary shift Invasion success Resource use 080 53 4 535-548 2011 1438-3896 https://www.documentation.ird.fr/hor/fdi:010053745 10.1007/s10144-011-0265-6 1438-3896 [F B010053745] https://www.documentation.ird.fr/hor/fdi:010053745 https://www.documentation.ird.fr/intranet/publi/2011/08/010053745.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-09-01 2017-08-23 fdi:010053745 fre