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Ecosystems

, Volume 16, Issue 3, pp 478–490 | Cite as

Cross-scale Habitat Structure Drives Fish Body Size Distributions on Coral Reefs

  • Kirsty L. Nash
  • Nicholas A. J. Graham
  • Shaun K. Wilson
  • David R. Bellwood
Article

Abstract

Despite a large number of studies focusing on the complexity of coral reef habitats and the characteristics of associated fish assemblages, the relationship between reef structure and fish assemblages remains unclear. The textural discontinuity hypothesis, which proposes that multi-modal body size distributions of organisms are driven by discontinuous habitat structure, provides a theoretical basis that may explain the influence of habitat availability on associated organisms. In this study we use fractal techniques to characterize patterns of cross-scale habitat complexity, and examine how this relates to body-depth abundance distributions of associated fish assemblages over corresponding spatial scales. Our study demonstrates that: (1) Reefs formed from different underlying substrata exhibit distinct patterns of cross-scale habitat complexity; (2) The availability of potential refuges at different scales correlates with patterns in fish body depth distributions, but habitat structure is more strongly related to the relative abundance of fish in the body depth modes, rather than to the number of modes; (3) As reefs change from coral- to algal-dominated states, the complexity of the underlying reef substratum may change, presenting a more homogenous environment to associated assemblages; (4) Individual fish body depth distributions may be multi-modal, however, these distributions are not static characteristics of the fish assemblage and may change to uni-modal forms in response to changing habitat condition. In light of predicted anthropogenic changes, there is a clear need to improve our understanding of the scale of ecological relationships to anticipate future changes and vulnerabilities.

Keywords

textural discontinuity hypothesis structural complexity rugosity reef degradation coral-dominated reef algal-dominated reef 

Notes

Acknowledgments

This study was funded by the Australian Research Council and the Queensland Smart Futures Fund. We thank Ross Barrett for making the measuring wheels, and two anonymous reviewers for their helpful comments.

Supplementary material

10021_2012_9625_MOESM1_ESM.doc (12 kb)
Supplementary material 1 (DOC 11 kb)

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Kirsty L. Nash
    • 1
  • Nicholas A. J. Graham
    • 1
  • Shaun K. Wilson
    • 2
    • 3
  • David R. Bellwood
    • 1
    • 4
  1. 1.Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook UniversityTownsvilleAustralia
  2. 2.Department of Environment and ConservationMarine Science ProgramKensingtonAustralia
  3. 3.The Oceans Institute, University of Western AustraliaCrawleyAustralia
  4. 4.School of Marine and Tropical Biology, James Cook UniversityTownsvilleAustralia

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