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

Zinke, Jens, Gilmour, James P., Fisher, Rebecca, Puotinen, Marji, Maina, Joseph, Darling, Emily, Stat, Michael, Richards, Zoe T., McClanahan, Timothy R., Beger, Maria, Moore, Cordelia, Graham, Nicholas A.J., Feng, Ming, Hobbs, Jean-Paul A., Evans, Scott N., Field, Stuart, Shedrawi, George, Babcock, Russ C., and Wilson, Shaun K. (2018) Gradients of disturbance and environmental conditions shape coral community structure for south-eastern Indian Ocean reefs. Diversity and Distributions, 24 (5). pp. 605-620.

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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.

Item ID: 53436
Item Type: Article (Research - C1)
ISSN: 1472-4642
Keywords: biodiversity, coral bleaching, coral life-history traits, Indian Ocean, sea surface temperature, tropical cyclones
Copyright Information: © 2018 John Wiley & Sons Ltd
Funders: University of Western Australia (UWA), ARC Centre of Excellence for Environmental Decisions (ARC-CoEED), University of Queensland (UQ), John D. and Catherine T. MacArthur Foundation (JDCTMF), Australian Institute of Marine Science (AIMS), Woodside Energy Limited, University of the Witwatersrand (UW), Curtin University (CU), Society of Conservation Biology, Cedar Tree Foundation (CTF)
Date Deposited: 03 May 2018 12:07
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 100%
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