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Recruitment, mortality, and resilience potential of scleractinian corals at Eilat, Red Sea

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Abstract

Events of mass coral bleaching and mortality have increased in recent decades worldwide, making coral recruitment more important than ever in sustaining coral-reef ecosystems and ensuring their resilience. During the last four decades, the coral reefs of Eilat have undergone severe deterioration due to both anthropogenic and natural causes. Recruitment failure has been frequently suggested as one of the main mechanisms underlying this deterioration. Here we assess the demographic replenishment and resilience potential of the local reefs, i.e., the potential for new sexually derived corals to recruit and exceed the community’s mortality rate. We present a detailed analysis of coral community demography, obtained by means of high-resolution photographic monitoring of permanently marked plots. Coral spats as small as 1 mm were documented and the detailed dynamics of coral recruitment and mortality were recorded, in addition to other common ecological measurements. The cumulative quantity of recruited individuals was twofold to fivefold higher than total mortality. The most significant predictor variable for coral recruitment among all ecological parameters measured was the available substrate for settlement, and the survival of recruited corals was correlated with reef structural complexity. Two consecutive annual reproductive seasons (June–September of each year) with high recruitment rates were monitored. Combined with the high survival of recruits and the increase in coral live cover and abundance, the findings from this study indicate an encouraging potential for recovery of these reefs.

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Acknowledgments

We gratefully acknowledge the Underwater Observatory Marine Park in Eilat and its diving team for their assistance in the field. We thank the Interuniversity Institute (IUI) in Eilat for the hospitality and logistical support throughout this study. We also thank Y. Shlesinger, O. Bronstein and three anonymous reviewers for constructive comments on earlier versions of the manuscript, A. Hazan for graphical assistance, N. Paz for proofreading, and all of the YL lab members. This study was supported by the Israel Science Foundation (ISF) No. 341/12 and USAID/MERC Grant No. M32-037 to YL.

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  1. Department of Zoology, The George S. Wise Faculty of Life Sciences, Tel-Aviv University, 69978, Tel-Aviv, Israel

    Tom Shlesinger & Yossi Loya

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  1. Tom Shlesinger
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Correspondence to Tom Shlesinger.

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Communicated by Biology Editor Dr. Mark J. A. Vermeij

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Shlesinger, T., Loya, Y. Recruitment, mortality, and resilience potential of scleractinian corals at Eilat, Red Sea. Coral Reefs 35, 1357–1368 (2016). https://doi.org/10.1007/s00338-016-1468-2

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