FN Archimer Export Format PT J TI The dimensionality and structure of species trait spaces BT AF Mouillot, David Loiseau, Nicolas Grenié, Matthias Algar, Adam C. Allegra, Michele Cadotte, Marc W. Casajus, Nicolas Denelle, Pierre Guéguen, Maya Maire, Anthony Maitner, Brian McGill, Brian J. McLean, Matthew Mouquet, Nicolas Munoz, François Thuiller, Wilfried Villeger, Sébastien Violle, Cyrille AUBER, Arnaud AS 1:1,2;2:1;3:3;4:4;5:5;6:6;7:7;8:8;9:9;10:10;11:11;12:12;13:13;14:1,7;15:14;16:9;17:1;18:3;19:15; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:PDG-RBE-HMMN-LRHBL; C1 MARBEC, University of Montpellier, CNRS, IFREMER, IRD, Montpellier, France Institut Universitaire de France, IUF, Paris, France Centre d'Ecologie Fonctionnelle et Evolutive—UMR 5175 CEFE, University of Montpellier, CNRS, EPHE, University of Paul Valéry, IRD, Montpellier, France Department of Biology, Lakehead University, Thunder Bay, ON, Canada Institut de Neurosciences de la Timone, Aix Marseille Université, UMR 7289, CNRS, Marseille, France Department of Biological Sciences, University of Toronto-Scarborough, Toronto, ON, Canada FRB—CESAB, Institut Bouisson Bertrand, Montpellier, France Biodiversity, Macroecology & Biogeography, University of Goettingen, Göttingen, Germany Laboratoire d'Ecologie Alpine, Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, LECA, Grenoble, Fr EDF R&D, LNHE (Laboratoire National d'Hydraulique et Environnement), Chatou, France Department of Ecology and Evolutionary Biology, University of Connecticut, Mansfield, CT, USA School of Biology and Ecology and Mitchell Center for Sustainability Solutions, University of Maine, Orono, ME, USA Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada LiPhy (Laboratoire Interdisciplinaire de Physique), Université Grenoble Alpes, Grenoble, France IFREMER, Unité Halieutique Manche Mer du Nord, Laboratoire Ressources Halieutiques, Boulogne-sur- Mer, France C2 UNIV MONTPELLIER, FRANCE INST UNIV FRANCE, FRANCE UNIV MONTPELLIER, FRANCE UNIV LAKEHEAD, CANADA UNIV AIX MARSEILLE, FRANCE UNIV TORONTO, CANADA FRB-CESAB, FRANCE UNIV GOTTINGEN, GERMANY UNIV GRENOBLE ALPES, FRANCE EDF, FRANCE UNIV CONNECTICUT, USA UNIV MAINE US, USA UNIV DALHOUSIE, CANADA UNIV GRENOBLE ALPES, FRANCE IFREMER, FRANCE SI BOULOGNE SE PDG-RBE-HMMN-LRHBL UM MARBEC IN WOS Ifremer UPR WOS Cotutelle UMR copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe IF 11.274 TC 52 UR https://archimer.ifremer.fr/doc/00694/80643/99891.pdf LA English DT Article CR INTERNATIONAL BOTTOM TRAWL SURVEY (IBTS) DE ;complexity;functional ecology;hypervolume;species clustering;species uniqueness AB Trait- based ecology aims to understand the processes that generate the overarching diversity of organismal traits and their influence on ecosystem functioning. Achieving this goal requires simplifying this complexity in synthetic axes defining a trait space and to cluster species based on their traits while identifying those with unique combinations of traits. However, so far, we know little about the dimensionality, the robustness to trait omission and the structure of these trait spaces. Here, we propose a unified framework and a synthesis across 30 trait datasets representing a broad variety of taxa, ecosystems and spatial scales to show that a common trade- off between trait space quality and operationality appears between three and six dimensions. The robustness to trait omission is generally low but highly variable among datasets. We also highlight invariant scaling relationships, whatever organismal complexity, between the number of clusters, the number of species in the dominant cluster and the number of unique species with total species richness. When species richness increases, the number of unique species saturates, whereas species tend to disproportionately pack in the richest cluster. Based on these results, we propose some rules of thumb to build species trait spaces and estimate subsequent functional diversity indices. PY 2021 PD SEP SO Ecology Letters SN 1461-023X PU Wiley / Blackwell VL 24 IS 9 UT 000652552400001 BP 1988 EP 2009 DI 10.1111/ele.13778 ID 80643 ER EF