Jacquet C. auteur aut IRD Mouillot D. auteur aut IRD Kulbicki Michel auteur aut IRD Gravel D. auteur aut IRD text journalArticle eng text/pdf born digital access The Theory of Island Biogeography (TIB) predicts how area and isolation influence species richness equilibrium on insular habitats. However, the TIB remains silent about functional trait composition and provides no information on the scaling of functional diversity with area, an observation that is now documented in many systems. To fill this gap, we develop a probabilistic approach to predict the distribution of a trait as a function of habitat area and isolation, extending the TIB beyond the traditional species-area relationship. We compare model predictions to the body-size distribution of piscivorous and herbivorous fishes found on tropical reefs worldwide. We find that small and isolated reefs have a higher proportion of large-sized species than large and connected reefs. We also find that knowledge of species body-size and trophic position improves the predictions of fish occupancy on tropical reefs, supporting both the allometric and trophic theory of island biogeography. The integration of functional ecology to island biogeography is broadly applicable to any functional traits and provides a general probabilistic approach to study the scaling of trait distribution with habitat area and isolation. specialized Allometric theory body-size food web island biogeography tropical reefs 036 082 20 2 135-146 2017 1461-023X https://www.documentation.ird.fr/hor/fdi:010069289 10.1111/ele.12716 1461-023X [F B010069289] https://www.documentation.ird.fr/hor/fdi:010069289 https://www.documentation.ird.fr/intranet/publi/2017/03/010069289.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2017-04-04 2023-07-11 fdi:010069289 fre