Choosing and using multiple traits in functional diversity research

Species are different, but they are not equally different. Yet many indices of biodiversity assume species vary to identical degrees. This notion does not meet with intuition: some species vary greatly in terms of their morphology, behaviour and ecology, while others vary only a little. One way to reconcile the dissimilarity between species is by collecting information on their functional traits (FTs), descriptors of how organisms interact with their environment and each other. Functional diversity (FD) is the total variation in one or more FTs across all species within a community, and provides a powerful complement to species diversity. There are several challenges facing the application of FD to conservation science, including lack of rigorous trait data for many organisms, and sparse details on how to select available traits to generate meaningful inferences for the various summary metrics of FD. This Comment provides a brief discussion on choosing and using FTs, and recommendations for best practice. Ultimately, researchers need to consider using a variety of traits when hypotheses are multifaceted or could potentially evolve, at the same time thinking critically about trait selection to avoid redundant information.

[1]  J. Rosenfeld,et al.  Functional redundancy in ecology and conservation , 2002 .

[2]  Wilfried Thuiller,et al.  Quantifying the relevance of intraspecific trait variability for functional diversity , 2011 .

[3]  Stuart J. Kininmonth,et al.  Integrating abundance and functional traits reveals new global hotspots of fish diversity , 2013, Nature.

[4]  Stefano Allesina,et al.  The dimensionality of ecological networks. , 2013, Ecology letters.

[5]  V. Pillar,et al.  An improved method for searching plant functional types by numerical analysis , 2003 .

[6]  Daniel P. Faith,et al.  Conservation Priorities and Phylogenetic Pattern , 1996 .

[7]  R. Pakeman.  Functional trait metrics are sensitive to the completeness of the species' trait data? , 2014 .

[8]  D. Bellwood,et al.  Functional versatility supports coral reef biodiversity , 2006, Proceedings of the Royal Society B: Biological Sciences.

[9]  Richard C. Thompson,et al.  Spatial heterogeneity increases the importance of species richness for an ecosystem process , 2009 .

[10]  M. Cadotte,et al.  Unifying measures of biodiversity: understanding when richness and phylogenetic diversity should be congruent , 2013 .

[11]  Roderick Hunt,et al.  Allocating C-S-R plant functional types : a soft approach to a hard problem , 1999 .

[12]  Owen L. Petchey,et al.  Functional diversity: back to basics and looking forward. , 2006, Ecology letters.

[13]  J. HilleRisLambers,et al.  Rethinking Community Assembly through the Lens of Coexistence Theory , 2012 .

[14]  P. Legendre,et al.  A distance-based framework for measuring functional diversity from multiple traits. , 2010, Ecology.

[15]  Owen L. Petchey,et al.  HOW DO DIFFERENT MEASURES OF FUNCTIONAL DIVERSITY PERFORM , 2004 .

[16]  F. Chapin,et al.  EFFECTS OF BIODIVERSITY ON ECOSYSTEM FUNCTIONING: A CONSENSUS OF CURRENT KNOWLEDGE , 2005 .

[17]  Martin Daufresne,et al.  A user's guide to functional diversity indices , 2010 .

[18]  D. Ackerly,et al.  A trait-based test for habitat filtering: convex hull volume. , 2006, Ecology.

[19]  Andy Purvis,et al.  Functional traits, the phylogeny of function, and ecosystem service vulnerability , 2013, Ecology and evolution.

[20]  Wilfried Thuiller,et al.  Spatial mismatch and congruence between taxonomic, phylogenetic and functional diversity: the need for integrative conservation strategies in a changing world. , 2010, Ecology letters.

[21]  B. Enquist,et al.  Rebuilding community ecology from functional traits. , 2006, Trends in ecology & evolution.

[22]  D. Mouillot,et al.  New multidimensional functional diversity indices for a multifaceted framework in functional ecology. , 2008, Ecology.

[23]  Sandra Díaz,et al.  Towards an assessment of multiple ecosystem processes and services via functional traits , 2010, Biodiversity and Conservation.

[24]  Daniel C. Laughlin,et al.  The intrinsic dimensionality of plant traits and its relevance to community assembly , 2014 .

[25]  Katharine N. Suding,et al.  Inferring community assembly mechanisms from functional diversity patterns: the importance of multiple assembly processes , 2012 .

[26]  Donald A. Jackson,et al.  Functional-diversity indices can be driven by methodological choices and species richness. , 2009, Ecology.

[27]  Carlo Ricotta,et al.  CWM and Rao’s quadratic diversity: a unified framework for functional ecology , 2011, Oecologia.