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arXiv · 1606.08363

Among-site variability in the stochastic dynamics of East African coral reefs

Katherine A. Allen·John F. Bruno·Fiona Chong·Damian Clancy·Tim R. McClanahan·Matthew Spencer·Kamila Zychaluk
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Abstract

Coral reefs are dynamic systems whose composition is highly influenced by unpredictable biotic and abiotic factors. Understanding the spatial scale at which long-term predictions of reef composition can be made will be crucial for guiding conservation efforts. Using a 22-year time series of benthic composition data from 20 reefs on the Kenyan and Tanzanian coast, we studied the long-term behaviour of Bayesian vector autoregressive state-space models for reef dynamics, incorporating among-site variability. We estimate that if there were no among-site variability, the total long-term variability would be approximately one third of its current value. Thus among-site variability contributes more to long-term variability in reef composition than does temporal variability. Individual sites are more predictable than previously thought, and predictions based on current snapshots are informative about long-term properties. Our approach allowed us to identify a subset of possible climate refugia sites with high conservation value, where the long-term probability of coral cover <= 0.1 was very low. Analytical results show that this probability is most strongly influenced by among-site variability and by interactions among benthic components within sites. These findings suggest that conservation initiatives might be successful at the site scale as well as the regional scale.

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Katherine A. Allen, John F. Bruno, Fiona Chong, Damian Clancy, Tim R. McClanahan, Matthew Spencer, Kamila Zychaluk. 2016-06-27. Among-site variability in the stochastic dynamics of East African coral reefs. https://arxiv.org/abs/1606.08363

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