Coral Reefs

, Volume 35, Issue 2, pp 473–483 | Cite as

Climate-driven coral reorganisation influences aggressive behaviour in juvenile coral-reef fishes

  • Judith E. Kok
  • Nicholas A. J. Graham
  • Mia O. Hoogenboom
Report

Abstract

Globally, habitat degradation is altering the abundance and diversity of species in a variety of ecosystems. This study aimed to determine how habitat degradation, in terms of changing coral composition under climate change, affected abundance, species richness and aggressive behaviour of juveniles of three damselfishes (Pomacentrus moluccensis, P. amboinensis and Dischistodus perspicillatus, in order of decreasing reliance on coral). Patch reefs were constructed to simulate two types of reefs: present-day reefs that are vulnerable to climate-induced coral bleaching, and reefs with more bleaching-robust coral taxa, thereby simulating the likely future of coral reefs under a warming climate. Fish communities were allowed to establish naturally on the reefs during the summer recruitment period. Climate-robust reefs had lower total species richness of coral-reef fishes than climate-vulnerable reefs, but total fish abundance was not significantly different between reef types (pooled across all species and life-history stages). The nature of aggressive interactions, measured as the number of aggressive chases, varied according to coral composition; on climate-robust reefs, juveniles used the substratum less often to avoid aggression from competitors, and interspecific aggression became relatively more frequent than intraspecific aggression for juveniles of the coral-obligate P. moluccensis. This study highlights the importance of coral composition as a determinant of behaviour and diversity of coral-reef fishes.

Keywords

Benthic composition Habitat degradation Intraspecific and interspecific aggression Species richness Community dynamics 

Supplementary material

338_2016_1411_MOESM1_ESM.docx (201 kb)
Supplementary material 1 (DOCX 201 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Judith E. Kok
    • 1
  • Nicholas A. J. Graham
    • 2
    • 3
  • Mia O. Hoogenboom
    • 1
    • 3
  1. 1.College of Marine and Environmental SciencesJames Cook UniversityTownsvilleAustralia
  2. 2.Lancaster Environment CentreLancaster UniversityLancasterUK
  3. 3.ARC Centre of Excellence for Coral Reef StudiesJames Cook UniversityTownsvilleAustralia

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