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Coral Reefs

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Evolution, diversity, distribution and the endangered future of the giant clam–Symbiodiniaceae association

  • Miguel MiesEmail author
Review

Abstract

Giant clams are found in a mutualistic association with Symbiodiniaceae dinoflagellates. While clams are economically important for fisheries, Symbiodiniaceae are responsible for most of the primary production in coral reefs. This review addresses key issues regarding the giant clam–Symbiodiniaceae holobiont: diversity and distribution; functional traits; evolution and coevolution; and consequences of climate change. Findings show that holobiont distribution is partitioned by host species and geography. So far, giant clams have been reported in association with only 30 Symbiodiniaceae phylotypes, all within genera Symbiodinium, Cladocopium and Durusdinium. Species and functional diversities are highest in the Coral Triangle. The association evolved in the Eocene–Oligocene transition; there is evidence for coevolution, including host organs developed for housing symbionts, change in host habitat and multiple symbiont phylotypes found exclusively in giant clams. Clam bleaching events have been recorded throughout the Indo-Pacific. These clams may be particularly vulnerable, as they rarely associate with stress-tolerant symbionts and are heavily targeted by fishing. The Great Barrier Reef is particularly at risk, as clams in that area do not associate with thermally tolerant, low-irradiance-adapted and opportunistic symbiont phylotypes. Further reduction in giant clam populations may serve as an important indicator of the increasing decline of coral reef biodiversity.

Keywords

Climate change Coral reefs Holobiont Symbiosis Tridacna Zooxanthellae 

Notes

Acknowledgements

I would like to thank the anonymous reviewers, Linda Waters, Maurício Shimabukuro, Arthur Güth and Paulo Sumida for their comments on the manuscript, and Juliana Ali and Arthur Güth for the illustrations.

Author contributions

MM compiled and analyzed the data and wrote the manuscript.

Compliance with ethical standards

Conflict of interest

The author declares that he have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Oceanographic Institute – University of São Paulo (IO-USP)São PauloBrazil

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