Trends in Ecology & Evolution
ReviewTraits Without Borders: Integrating Functional Diversity Across Scales
Section snippets
A Multi-Faceted FD
The responses of species to environmental conditions, disturbance, and biotic interactions, as well as their effects on ecosystem processes, are determined by their functional traits (see Glossary) 1, 2, 3, 4, 5. Consequently, functional trait-based approaches have great potential to address a variety of ecological questions [6], including the impact of global change on biodiversity and ecosystem service delivery 3, 7, 8, 9, ecological restoration [10], or the assembly of biological communities
TPD: Towards a Scale-Independent FD
If ecologists want to ultimately simplify the labyrinth of methods for quantifying FD, and make results of different studies more readily comparable, they will need to define a single framework that encompasses different approaches while providing the flexibility to move between multiple scales. Below we show that the foundations of such a framework can be found in studies using the concept of the niche as a hypervolume 47, 48 and those considering the probabilistic nature of functional traits
Incorporating Existing Methods into the TPD Framework
The TPD framework has the potential to unify existing FD approaches into a single and consistent structure, effectively incorporating ITV and the multidimensional nature of functional trait space across scales. In this section we first present corresponding adaptations of weighted mean trait values (TWM) [3], FD components [13], and of any method based on the trait dissimilarity between ecological units 61, 62, 63, 64, 65, highlighting when and how these adaptations solve several problems
Diversity Between and Across Ecological Units
As anticipated above, the promise of the TPD framework goes well beyond calculations within units. TPD functions can be used to evaluate mechanisms driving the spatial or temporal differences in the functional structure between populations, communities, or regions, that is, β-FD (see 76, 77 for reviews on the questions that can be tackled by studying β-diversity). We envisage that the TPD framework will lead to new techniques for estimating diversity across scales, for example quantifying the
Concluding Remarks
Because FD encompasses a variety of concepts and components, a combination of conceptual and mathematical approaches has, to date, been necessary to quantify it comprehensively 1, 19, 72. In this paper we have shown how the TPD concept can be applied to individuals, populations, communities, and regions, and we have provided an assortment of methods to estimate several aspects of FD using one or multiple traits within a single framework. The TPD framework implements, for the first time, the
Acknowledgments
We thank P. Craze and two anonymous reviewers for their helpful comments that improved this review. We also thank Marc Cadotte, Cristina Rota, Javier Seoane, and Carol Pedrero for their suggestions and feedback on these ideas. C.P.C. was supported by a Marie Curie Intra-European Fellowship within the European Commission 7th Framework Programme (TANDEM; project 626392) and by the Spanish MINECO (Project CGL2014-53789-R). F.d.B. and J.L. were supported by Czech Science Foundation grants GACR
Glossary
- Convex hull
- smallest convex volume that contains a set of points. In trait-based ecology, it is used to quantify the functional volume occupied by a species or community, as well as β-FD and its decomposition into nestedness and turnover components. Convex hulls are sensitive to outliers and do not detect gaps in the occupation of functional space.
- Ecological unit
- any scale at which it is meaningful to estimate FD. Examples are individual organisms, populations, species, communities,
References (99)
A functional approach reveals community responses to disturbances
Trends Ecol. Evol.
(2013)The return of the variance: intraspecific variability in community ecology
Trends Ecol. Evol.
(2012)Rebuilding community ecology from functional traits
Trends Ecol. Evol.
(2006)Why intraspecific trait variation matters in community ecology
Trends Ecol. Evol.
(2011)- et al.
Fitness of multidimensional phenotypes in dynamic adaptive landscapes
Trends Ecol. Evol.
(2015) Fifteen forms of biodiversity trend in the Anthropocene
Trends Ecol. Evol.
(2015)Non-linear responses of functional diversity and redundancy to agricultural intensification at the field scale in Mediterranean arable plant communities
Agric. Ecosyst. Environ.
(2014)Functional traits explain variation in plant life history strategies
Proc. Natl. Acad. Sci. U.S.A.
(2014)Incorporating plant functional diversity effects in ecosystem service assessments
Proc. Natl. Acad. Sci. U.S.A.
(2007)Plant functional traits and the multidimensional nature of species coexistence
Proc. Natl. Acad. Sci. U.S.A.
(2015)
Functional traits explain phytoplankton community structure and seasonal dynamics in a marine ecosystem
Ecol. Lett.
Beyond species: functional diversity and the maintenance of ecological processes and services
J. Appl. Ecol.
Land-use intensification reduces functional redundancy and response diversity in plant communities
Ecol. Lett.
Functional diversity enhances the resistance of ecosystem multifunctionality to aridity in Mediterranean drylands
New Phytol.
Functional identity and diversity of animals predict ecosystem functioning better than species-based indices
Proc. R. Soc. B: Biol. Sci.
Applying trait-based models to achieve functional targets for theory-driven ecological restoration
Ecol. Lett.
Ecological assembly rules in plant communities – approaches, patterns and prospects
Biol. Rev.
Functional diversity: back to basics and looking forward
Ecol. Lett.
Functional richness, functional evenness and functional divergence: the primary components of functional diversity
Oikos
New multidimensional functional diversity indices for a multifaceted framework in functional ecology
Ecology
Decomposing changes in phylogenetic and functional biodiversity across space and time
Methods Ecol. Evol.
Functional trait space and the latitudinal diversity gradient
Proc. Natl. Acad. Sci. U.S.A.
A user's guide to functional diversity indices
Ecol. Monogr.
Measuring biodiversity to explain community assembly: a unified approach
Biol. Rev.
Functional diversity measures: an overview of their redundancy and their ability to discriminate community assembly rules
Funct. Ecol.
Linking multidimensional functional diversity to quantitative methods: a graphical hypothesis-evaluation framework
Ecology
Integrating abundance and functional traits reveals new global hotspots of fish diversity
Nature
Global to community scale differences in the prevalence of convergent over divergent leaf trait distributions in plant assemblages
Glob. Ecol. Biogeogr.
Including intraspecific variability in functional diversity
Ecology
Plant ecological strategies: some leading dimensions of variation between species
Annu. Rev. Ecol. Syst.
Inter-specific and intra-specific trait variation along short environmental gradients in an old-growth temperate forest
J. Veg. Sci.
More for less: sampling strategies of plant functional traits across local environmental gradients
Funct. Ecol.
Decomposing functional β-diversity reveals that low functional β-diversity is driven by low functional turnover in European fish assemblages
Glob. Ecol. Biogeogr.
Functional beta-diversity patterns reveal deterministic community assembly processes in eastern North American trees
Glob. Ecol. Biogeogr.
Partitioning the turnover and nestedness components of beta diversity
Glob. Ecol. Biogeogr.
Rare species support vulnerable functions in high-diversity ecosystems
PLoS Biol.
Functional redundancy in ecology and conservation
Oikos
On the importance of intraspecific variability for the quantification of functional diversity
Oikos
Intraspecific trait variation is correlated with establishment success of alien mammals
Am. Nat.
How do traits vary across ecological scales? A case for trait-based ecology
Ecol. Lett.
Within-species variability is the main driver of community-level responses of traits of epiphytes across a long-term chronosequence
Funct. Ecol.
Intraspecific trait variability mediates the response of subalpine grassland communities to extreme drought events
J. Ecol.
A global meta-analysis of the relative extent of intraspecific trait variation in plant communities
Ecol. Lett.
Will among-population variation in seed traits improve the chance of species persistence under climate change?
Glob. Ecol. Biogeogr.
Leaf-trait plasticity and species vulnerability to climate change in a Mongolian steppe
Glob. Chang. Biol.
Functional trait differences and the outcome of community assembly: an experimental test with vernal pool annual plants
Oikos
Niche overlap estimates based on quantitative functional traits: a new family of non-parametric indices
Oecologia
New biodiversity measure that includes consistent interspecific and intraspecific components
Methods Ecol. Evol.
The n-dimensional hypervolume
Glob. Ecol. Biogeogr.
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