Abstract
Symbiodinium are dinoflagellates engaged in a mutualistic symbiosis with multiple coral reef taxa. They are divided in nine different clades (A–I), which typically associate with different hosts. However, very little information is available on metabolic differences in Symbiodinium types, especially when associated with metazoan larvae. We tested whether three ω3 fatty acids (stearidonic acid, SDA; docosapentaenoic acid, DPA; and docosahexaenoic acid, DHA) that are typically translocated from Symbiodinium to its host are produced by Symbiodinium types within clades A–F associated with Mussismilia hispida (scleractinian coral), Berghia stephanieae (nudibranch), and Tridacna crocea (giant clam) larvae. We acquired and spawned broodstock for each host, cultured their larvae, and offered Symbiodinium types belonging to clades A–F. Samples were taken during a 72-h window after the offer of Symbiodinium, and fatty acids were extracted and analyzed by gas chromatography. The concentrations of SDA and DPA for all host larvae–dinoflagellate associations were low and variable, without trends. However, M. hispida planula larvae associated with Symbiodinium A1 and C1 had a statistically significant higher amount of DHA. The veliger larvae of B. stephanieae digested the Symbiodinium, and the amount of DHA remained constant throughout the experiment. The veliger larvae of T. crocea associated with Symbiodinium A1 and C1 also presented a higher amount of DHA, although not statistically different from the other types. These results show that Symbiodinium A1 and C1, in the case of M. hispida and T. crocea (which usually harbor strains within clades A and C), may contribute a small amount of DHA to the larvae of these organisms and form a stronger mutualism than other strains.
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Acknowledgements
We would like to thank Mary Alice Coffroth for her comments on the manuscript and also for supplying the Symbiodinium cultures. We thank Carla Zilberberg and Ronaldo Francini-Filho for reviewing the manuscript and also Flávia Saldanha-Corrêa, the entire Coral Vivo Institute staff, Henrique Alves, Priscilla Derogis, and Linda Waters. This work was supported by Projeto Coral Vivo and sponsored by Petrobras and Arraial d’Ajuda Eco Parque. PYGS acknowledges Grants 302526/2012-9 and 2010/20350-8 from CNPq and FAPESP.
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Mies, M., Chaves-Filho, A.B., Miyamoto, S. et al. Production of three symbiosis-related fatty acids by Symbiodinium types in clades A–F associated with marine invertebrate larvae. Coral Reefs 36, 1319–1328 (2017). https://doi.org/10.1007/s00338-017-1627-0
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DOI: https://doi.org/10.1007/s00338-017-1627-0