Marine Biology

, 165:138 | Cite as

Depth patterns in microhabitat versatility and selectivity in coral reef damselfishes

  • Chancey MacDonaldEmail author
  • Mele I. Tauati
  • Geoffrey P. Jones
Original paper


Increasing disturbances on coral reefs threaten fish species with close microhabitat associations in shallow waters, but deep reefs may provide refuge habitats. Assessing this potential requires a comprehensive understanding of how versatility in microhabitat use, preference, and selectivity interact with changes in habitat composition along depth gradients. We examined six damselfish species categorized by versatility of shallow-water microhabitat association (‘complex-coral-specialists’, ‘coral-associates’, and ‘generalists’), along a depth gradient from 10 to 30 m in Kimbe Bay, Papua New Guinea, and tested four important hypotheses. (1) We examined associations with hard-coral and complex-coral microhabitats. Hard-coral association declined with depth more among generalists than coral-associates but complex-coral microhabitat association declined for all species except one complex-coral-specialist. (2) We studied whether microhabitat selectivity declines with depth. Unexpectedly, selectivity increased with depth among both generalist and specialist species. (3) Within species, we tested for positive relationships between fish abundance and preferred microhabitat availability at each depth. However, relationships were stochastic across depths for all but one complex-coral-specialist. (4) Finally, we tested for positive relationships between the number of microhabitats selected by a species and the species’ abundance at each depth, finding that species’ abundances were not consistently related to microhabitat versatility. Our results suggest that several species currently utilize deep coral microhabitats (≤ 30 m), including specialists that strongly associate with vulnerable coral habitats in shallow water. Considerable microhabitat plasticity occurred along the gradient, even amidst stable preferences, and versatile species were not habitat limited, though restricted versatility may limit refuge potential for some species.



We thank Phillip Smith for field assistance and M. Bonin for theoretical and analytical advice, and J. Eurich and T. Rüger for helpful comments. M. Ikanga thanks her family for their support, patience and encouragement. Mahonia Na Dari—Guardians of the Sea and Walindi Plantation Resort provided valuable logistical support.

Compliance with ethical standards


This study was funded by a Grant to G. P. Jones from the Australian Research Council.

Conflict of interest

C. MacDonald declares that he has no conflict of interest. M. Ikanga declares that she has no conflict of interest. G. P. Jones declares that he has no conflict of interest.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Marine Biology and Aquaculture Science, College of Science and EngineeringJames Cook UniversityTownsvilleAustralia
  2. 2.ARC Centre of Excellence for Coral Reef StudiesJames Cook UniversityTownsvilleAustralia

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