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    Rights statement: This is the peer reviewed version of the following article: JZinke J, Gilmour JP, Fisher R, et al. Gradients of disturbance and environmental conditions shape coral community structure for south‐eastern Indian Ocean reefs. Divers Distrib. 2018;24:605–620. https://doi.org/10.1111/ddi.12714 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/ddi.12714/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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Gradients of disturbance and environmental conditions shape coral community structure for south-eastern Indian Ocean reefs

Research output: Contribution to journalJournal article

Published
  • Jens Zinke
  • James Gilmour
  • Rebecca Fisher
  • Marji Poutine
  • Joseph Maina
  • Emily Darling
  • Michael Stat
  • Zoe T. Richards
  • Timothy R. McClanahan
  • Maria Beger
  • Cordelia Moore
  • Nicholas Anthony James Graham
  • Ming Feng
  • Jean-Paul A. Hobbs
  • Scott N. Evans
  • Stuart Field
  • George Shedrawi
  • Russ C. Babcock
  • Shaun Wilson
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<mark>Journal publication date</mark>05/2018
<mark>Journal</mark>Diversity and Distributions
Issue number5
Volume24
Number of pages16
Pages (from-to)605-620
Publication statusPublished
Early online date23/01/18
Original languageEnglish

Abstract

Aim
To describe, model and assess the relative importance of environmental and climatic factors likely influencing the regional distribution of coral cover and assemblages with contrasting life histories and susceptibilities to bleaching.

Location
We compiled the first comprehensive empirical dataset for coral communities in the south-eastern Indian Ocean (SEIO), incorporating information from 392 sites along the western coast of Australia and offshore atolls/islands across ~19° of latitude.

Methods
We assessed hard coral cover and community composition to genus using point-intercept transects or point-count analysis of digital images taken along transects. We explored spatial variation in environmental conditions and in composition of corals with contrasting life histories. After de-trending the temporal patterns, we assessed the relative importance of environmental metrics to coral cover, life histories and bleaching susceptibility using a full subsets model-selection approach with generalized additive mixed models, accounting for both temporal and among site variation.

Results
The distribution of temperature, light, the frequency of temperature anomalies and tropical cyclones appear to be drivers of coral community structure. Functional diversity of low- to mid-latitude coral communities may convey some resilience to thermal stress, while higher latitude communities dominated by Competitive and Bleaching-Susceptible taxa may lack this functional resilience. These patterns likely reflect varying historical exposure to cyclones and temperature anomalies.

Main conclusions
As evident in recent years, changing background conditions and regimes of disturbance in coming decades will shift the distribution, functional diversity and resilience of coral reefs throughout the SEIO. The rate and magnitude of environmental change will ultimately determine the future of the tropical reefs and whether the higher latitude reefs provide some refuge from climate change. Our study highlights the need to quantify the distributional properties of key environmental metrics to better understand and predict reef condition through coming decades.

Bibliographic note

This is the peer reviewed version of the following article: JZinke J, Gilmour JP, Fisher R, et al. Gradients of disturbance and environmental conditions shape coral community structure for south‐eastern Indian Ocean reefs. Divers Distrib. 2018;24:605–620. https://doi.org/10.1111/ddi.12714 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/ddi.12714/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.