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Oecologia

, Volume 142, Issue 3, pp 353–359 | Cite as

Functional regularity: a neglected aspect of functional diversity

  • David MouillotEmail author
  • W. H. Norman Mason
  • Olivier Dumay
  • J. Bastow Wilson
Methods

Abstract

Functional diversity has been identified as a key to understanding ecosystem and community functioning. However, due to the lack of a sound definition its nature and measurement are still poorly understood. In the same way that species diversity can be split into species richness and species evenness, so functional diversity can be split into functional richness (i.e. the amount of functional trait/character/attribute space filled) and functional evenness (i.e. the evenness of abundance distribution in functional trait space). We propose a functional regularity index (FRO) as a measure of functional evenness for situations where species are represented only by a single functional trait value (e.g. mean, median or mode), and species abundances are known. This new index is based on the Bulla O index of species evenness. When dealing with functional types or categorical functional traits, the Bulla O or any other accepted species evenness index may be used directly to measure functional evenness. The advantage of FRO is that it supplies a measure of functional evenness for continuous trait data. The FRO index presented in this paper fulfils all the a priori criteria required. We demonstrate with two example datasets that a range of FRO values may be obtained for both plant and animal communities. Moreover, FRO was strongly related to ecosystem function as seen in photosynthetic biomass in plant communities, and was able to differentiate sampling stations in a lagoon based on the functional traits of fish. Thus, the FRO index is potentially a highly useful tool for measuring functional diversity in a variety of ecological situations.

Keywords

Brackish lagoon fishes Functional diversity Functional niche Functional traits Plant biomass 

Notes

Acknowledgements

We thank Pierre-Samuel Tari, Laurianne Laine, François Moreno and Jean-Antoine Tomasini for help in the sampling program and in the measure of functional traits. Two anonymous reviewers provided helpful comments. This work was supported by the grant 002420 from University of Montpellier II on ‘Functional diversity of lagoon fish species’.

References

  1. Adite A, Winemiller KO (1997) Trophic ecology and ecomorphology of fish assemblages in coastal lakes of Benin, West Africa. Ecoscience 4:6–23Google Scholar
  2. Bellwood DR, Wainwright PC (2001) Locomotion in labrid fishes: implications for habitat use and cross-shelf biogeography on the Great Barrier Reef. Coral Reefs 20:139–150CrossRefGoogle Scholar
  3. Bellwood DR, Wainwright PC, Fulton CJ, Hoey A (2002) Assembly rules and functional groups at global biogeographical scales. Funct Ecol 16:557–562CrossRefGoogle Scholar
  4. Bulla L (1994) An index of evenness and its associated diversity measure. Oikos 70:167–171Google Scholar
  5. Cameron T (2002) The year of the ‘diversity-ecosystem function’ debate. Trends Ecol Evol 17:495–496CrossRefGoogle Scholar
  6. Cardinale BJ, Palmer MA (2002) Disturbance moderates biodiversity-ecosystem function relationships: experimental evidence from caddisflies in stream mesocosms. Ecology 83:1915–1927Google Scholar
  7. Diaz S, Cabido M (1997) Plant functional types and ecosystem function in relation to global change. J Veg Sci 8:463–474Google Scholar
  8. Diaz S, Cabido M (2001) Vive la difference: plant functional diversity matters to ecosystem processes. Trends Ecol Evol 16:646–655CrossRefGoogle Scholar
  9. Diaz S, Cabido M, Zak M, Carretero EM, Aranibar J (1999) Plant functional traits, ecosystem structure and land-use history along a climatic gradient in central-western Argentina. J Veg Sci 10:651–660Google Scholar
  10. Dimitrakopoulos PG, Schmid B (2004) Biodiversity effects increase linearly with biotope space. Ecol Lett 7:574–583CrossRefGoogle Scholar
  11. Dumay O, Tari PS, Tomasini JA, Mouillot D (2004) Functional groups of lagoon fish species in Languedoc Roussillon (South of France, Mediterranean Sea). J Fish Biol 64:970–983CrossRefGoogle Scholar
  12. Engelhardt KAM, Ritchie ME (2002) The effect of aquatic plant species richness on wetland ecosystem processes. Ecology 83:2911–2924Google Scholar
  13. Enquist BJ, Niklas KJ (2002) Global allocation rules for patterns of biomass partitioning in seed plants. Science 295:1517–1520CrossRefPubMedGoogle Scholar
  14. Fonseca CR, Ganade G (2001) Species functional redundancy, random extinctions and the stability of ecosystems. J Ecol 89:118–125CrossRefGoogle Scholar
  15. Grime JP (1997) Biodiversity and ecosystem function: the debate deepens. Science 277:1260–1261CrossRefGoogle Scholar
  16. Huston MA (1997) Hidden treatments in ecological experiments: re-evaluating the ecosystem function of biodiversity. Oecologia 110:449–460CrossRefGoogle Scholar
  17. Kinzig AP, Pacala SW, Tilman D (2002) The functional consequences of biodiversity: empirical progress and theoretical extensions. Princeton University Press, PrincetonGoogle Scholar
  18. Kramer DL, Bryant MJ (1995a) Intestine length in the fishes of a tropical stream. 1. Ontogenic allometry. Environ Biol Fishes 42:115–127Google Scholar
  19. Kramer DL, Bryant MJ (1995b) Intestine length in the fishes of a tropical stream. Relationships to diet—the long and short of a convoluted issue. Environ Biol Fish 42:129–141Google Scholar
  20. Lavorel S, Rochette C, Lebreton JD (1999) Functional groups for response to disturbance in Mediterranean old fields. Oikos 84:480–498Google Scholar
  21. Loreau M, Naeem S, Inchausti P, Bengtsson J, Grime JP, Hector A, Hooper DU, Huston MA, Raffaelli D, Schmid B, Tilman D, Wardle DA (2001) Biodiversity and ecosystem functioning: current knowledge and future challenges. Science 294:804–808CrossRefPubMedGoogle Scholar
  22. Ludwig JA, Reynolds JF (1988) Statistical ecology. A primer on methods and computing. Wiley, New YorkGoogle Scholar
  23. MacArthur R, Levins R (1967) Limiting similarity convergence and divergence of coexisting species. Am Nat 101:377–387CrossRefGoogle Scholar
  24. Mason NWH, MacGillivray K, Steel JB, Wilson JB (2003) An index of functional diversity. J Veg Sci 14:571–578Google Scholar
  25. Mouillot D, Wilson JB (2002) Can we tell how a community was constructed? A comparison of five evenness indices for their ability to identify theoretical models of community construction. Theor Popul Biol 61:141–151CrossRefPubMedGoogle Scholar
  26. Naeem S, Wright JP (2003) Disentangling biodiversity effects on ecosystem functioning: deriving solutions to a seemingly insurmountable problem. Ecol Lett 6:567–579CrossRefGoogle Scholar
  27. Naeem S, Knops JMH, Tilman D, Howe KM, Kennedy T, Gale S (2000) Plant diversity increases resistance to invasion in the absence of covarying extrinsic factors. Oikos 91:97–108Google Scholar
  28. Pearson TH (2001) Functional group ecology in soft-sediment marine benthos: the role of bioturbation. Oceanogr Mar Biol 39:233–267Google Scholar
  29. Petchey OL, Gaston KJ (2002) Functional diversity (FD), species richness and community composition. Ecol Lett 5:402–411CrossRefGoogle Scholar
  30. Petchey OL, Hector A, Gaston KJ (2004) How do different measures of functional diversity perform? Ecology 85:847–857Google Scholar
  31. Polley HW, Wilsey BJ, Derner JD (2003) Do species evenness and plant density influence the magnitude of selection and complementarity effects in annual plant species mixtures? Ecol Lett 6:248–256CrossRefGoogle Scholar
  32. Purvis A, Hector A (2000) Getting the measure of biodiversity. Nature 405:212–219CrossRefPubMedGoogle Scholar
  33. Roscher C, Schumacher J, Baade J, Wilcke W, Gleixner G, Weisser WW, Schmid B, Schulze ED (2004) The role of biodiversity for element cycling and trophic interactions: an experimental approach in a grassland community. Basic Appl Ecol 5:107–121Google Scholar
  34. Rosenfeld JS (2002) Functional redundancy in ecology and conservation. Oikos 98:156–162CrossRefGoogle Scholar
  35. Roughgarden J (1974) Niche width: biogeographic patterns among Anolis lizard populations. Am Nat 108:429–442CrossRefGoogle Scholar
  36. Schmid B (2002) The species richness-productivity controversy. Trends Ecol Evol 17:113–114CrossRefGoogle Scholar
  37. Sibbing FA, Nagelkerke LAJ (2001) Resource partitioning by Lake Tana barbs predicted from fish morphometrics and prey characteristics. Rev Fish Biol Fish 10:393–437CrossRefGoogle Scholar
  38. Smith B, Wilson JB (1996) A consumer’s guide to evenness indices. Oikos 76:70–82Google Scholar
  39. Smith B, Moore SH, Grove PB, Harris NS, Mann S, Wilson JB (1994) Vegetation texture as an approach to community structure: community-level convergence in a New Zealand temperate rainforest. N Z J Ecol 18:41–50Google Scholar
  40. Stubbs WJ, Wilson JB (2004) Evidence for limiting similarity in a sand dune community. J Ecol (in press)Google Scholar
  41. Tilman D (1999) The ecological consequences of changes in biodiversity: a search for general principles. Ecology 80:1455–1474Google Scholar
  42. Tilman D, Wedin D, Knops J (1996) Productivity and sustainability influenced by biodiversity in grassland ecosystems. Nature 379:718–720CrossRefGoogle Scholar
  43. Tilman D, Knops J, Weldin D, Reich P, Ritchie M, Siemann E (1997) The influence of functional diversity and composition on ecosystem processes. Science 277:1300–1302Google Scholar
  44. Tokeshi, M (1999) Species coexistence: ecological and evolutionary perspectives. Blackwell, OxfordGoogle Scholar
  45. Wainwright PC, Bellwood DR, Westneat MW (2002) Ecomorphology of locomotion in labrid fishes. Environ Biol Fishes 65:47–62CrossRefGoogle Scholar
  46. Walker JA, Westneat MW (2000) Mechanical performance of aquatic rowing and flying. Proc R Soc Lond B Biol Sci 267:1875–1881CrossRefPubMedGoogle Scholar
  47. Wardle DA (1999a) Biodiversity, ecosystems and interactions that transcend the interface. Trends Ecol Evol 14: 125-127CrossRefGoogle Scholar
  48. Wardle, D. A. (1999b) Is “sampling effect” a problem for experiments investigating biodiversity – ecosystem function relationships? Oikos 87: 403-407Google Scholar
  49. Wardle DA (2001) Experimental demonstration that plant diversity reduces invasibility—evidence of a biological mechanism or a consequence of sampling effect? Oikos 95:161–170Google Scholar
  50. West GB, Brown JH, Enquist BJ (1997) A general model for the origin of allometric scaling laws in biology. Science 276:122–126Google Scholar
  51. Wilsey BJ, Polley HW (2002) Reductions in grassland species evenness increase dicot seedling invasion and spittle bug infestation. Ecol Lett 5:676–684CrossRefGoogle Scholar
  52. Wilsey BJ, Potvin C (2000) Biodiversity and ecosystem functioning: Importance of species evenness in an old field. Ecology 81:887–892Google Scholar
  53. Wilson JB (1988) The effect of initial advantage on the course of competition. Oikos 51:19–24Google Scholar
  54. Wilson JB (1999) Guilds, functional types and ecological groups. Oikos 86:507–522Google Scholar
  55. Winemiller KO (1991) Ecomorphological diversification in lowland fresh-water fish assemblages from 5 biotic regions. Ecol Monogr 61:343–365Google Scholar

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • David Mouillot
    • 1
    Email author
  • W. H. Norman Mason
    • 2
  • Olivier Dumay
    • 1
  • J. Bastow Wilson
    • 2
  1. 1.UMR CNRS-UMII 5119 Ecosystèmes LagunairesUniversité Montpellier II CC 093Montpellier Cedex 5France
  2. 2.Botany DepartmentUniversity of OtagoDunedinNew Zealand

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