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Marine Ecology Progress Series

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MEPS 600:245-253 (2018)  -  DOI:

Leveraging new knowledge of Symbiodinium community regulation in corals for conservation and reef restoration

Kate M. Quigley1,2,*, Line K. Bay2,**, Bette L. Willis1,**

1ARC Centre of Excellence for Coral Reef Studies, and College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
2Australian Institute of Marine Science, PMB3, Townsville, QLD 4810, Australia
*Corresponding author: **These authors contributed equally to this work

ABSTRACT: Recent advances in quantifying the heritability of Symbiodinium communities associated with corals across a range of reproductive and symbiont transmission modes raise the possibility that corals have more options for responding to a changing environment than previously thought. Here we synthesize recent findings to develop a new perspective on coral-symbiont transmission and explore the relevance of these findings to the development of novel coral reef conservation and management tools. Evidence of diversity in Symbiodinium communities among juvenile corals can be attributed to variation in the host genotype acquired. This highlights the importance of inheriting a genetic architecture for regulating Symbiodinium community composition that is flexible enough to respond to changing environmental conditions. Emerging evidence from 8 species now exists that the strength and fidelity of coral-Symbiodinium associations differ from current paradigms based on host reproductive and symbiont transmission mode. This evidence supports that rapid adaptive responses of the holobiont through variations in Symbiodinium community structure are possible. Importantly, evidence of heritable variation in Symbiodinium communities indicates that adaptation through natural selection on this community is possible and that the strength of the response will depend on estimates of both heritability and phenotypic variance. We also present a novel analysis applying these results to quantitative genetic theory to model manipulative adaptive shifts. In combination, recent heritability estimates (h2) reviewed here highlight that inheritance of genes for regulating Symbiodinium community structure represents a previously unquantified mechanism by which juvenile corals may adapt to increasing environmental pressures, particularly those due to climate change.

KEY WORDS: Symbiodinium · Symbiosis · Coral reef · Adaptation · Coral bleaching

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Cite this article as: Quigley KM, Bay LK, Willis BL (2018) Leveraging new knowledge of Symbiodinium community regulation in corals for conservation and reef restoration. Mar Ecol Prog Ser 600:245-253.

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