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Article Dans Une Revue Functional Ecology Année : 2018

Constraints on the functional trait space of aquatic invertebrates in bromeliads

1 LEFE - Laboratoire Ecologie Fonctionnelle et Environnement
2 UFRN - Universidade Federal do Rio Grande do Norte [Natal]
3 UBC - University of British Columbia
4 UNICAMP - Universidade Estadual de Campinas = University of Campinas
5 CESAB - Centre de Synthèse et d’Analyse sur la Biodiversité
6 Universidad Nacional de Rosario [Santa Fe]
7 LMGE - Laboratoire Microorganismes : Génome et Environnement
8 UMR AMAP - Botanique et Modélisation de l'Architecture des Plantes et des Végétations
9 UNIANDES - Universidad de los Andes [Bogota]
10 Department of Forest and Conservation Sciences and Centre for Forest Conservation Genetics
11 School of Biological and Chemical Sciences
12 UFRGS - Universidade Federal do Rio Grande do Sul [Porto Alegre]
13 USP - Universidade de São Paulo = University of São Paulo
14 UFRJ - Universidade Federal do Rio de Janeiro [Brasil] = Federal University of Rio de Janeiro [Brazil] = Université fédérale de Rio de Janeiro [Brésil]
15 Institute for tropical ecosystem studies - ITES (San Juan, Puerto Rico)
16 LIEC - Laboratoire Interdisciplinaire des Environnements Continentaux
17 EEB - Department of Ecology and Evolutionary Biology [University of Toronto]
18 BBIB - Berlin-Brandenburg Institute of Advanced Biodiversity Research
19 Institut Pasteur de la Guyane
20 UNESP - Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University
21 IRSNB / RBINS - Institut Royal des Sciences Naturelles de Belgique = Royal Belgian Institute of Natural Sciences
Diane Srivastava
Stanislas Talaga

Résumé

Functional traits are commonly used in predictive models that link environmental drivers and community structure to ecosystem functioning. A prerequisite is to identify robust sets of continuous axes of trait variation, and to understand the ecological and evolutionary constraints that result in the functional trait space occupied by interacting species. Despite their diversity and role in ecosystem functioning, little is known of the constraints on the functional trait space of invertebrate biotas of entire biogeographic regions. We examined the ecological strategies and constraints underlying the realized trait space of aquatic invertebrates, using data on 12 functional traits of 852 taxa collected in tank bromeliads from Mexico to Argentina. Principal Component Analysis was used to reduce trait dimensionality to significant axes of trait variation, and the proportion of potential trait space that is actually occupied by all taxa was compared to null model expectations. Permutational Analyses of Variance were used to test whether trait combinations were clade‐dependent. The major axes of trait variation represented life‐history strategies optimizing resource use and antipredator adaptations. There was evidence for trophic, habitat, defence and life‐history niche axes. Bromeliad invertebrates only occupied 16%–23% of the potential space within these dimensions, due to greater concentrations than predicted under uniform or normal distributions. Thus, despite high taxonomic diversity, invertebrates only utilized a small number of successful ecological strategies. Empty areas in trait space represented gaps between major phyla that arose from biological innovations, and trait combinations that are unviable in the bromeliad ecosystem. Only a few phylogenetically distant genera were neighbouring in trait space. Trait combinations aggregated taxa by family and then by order, suggesting that niche conservatism was a widespread mechanism in the diversification of ecological strategies.
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Dates et versions

hal-02166192 , version 1 (15-07-2019)

Identifiants

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Régis Cereghino, Valério D. Pillar, Diane Srivastava, Paula de Omena, A. Andrew M. Macdonald, et al.. Constraints on the functional trait space of aquatic invertebrates in bromeliads. Functional Ecology, 2018, 32 (10), pp.2435-2447. ⟨10.1111/1365-2435.13141⟩. ⟨hal-02166192⟩
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