Abstract
It has long been hypothesized that Western Australian coral reefs are genetically connected to those in Indonesia via long-distance dispersal, and that this connection may influence the timing of annual mass coral spawning on Western Australian coral reefs. This genetic connection has not been tested, and it requires re-evaluation because spawning patterns of Western Australian corals are not as synchronous or seasonal as originally thought. Here, we used population genetics to examine patterns of gene flow among populations of the scleractinian coral Acropora tenuis in Indonesia and Western Australia. Analysis of microsatellite data showed that Indonesian and Australian populations are highly genetically differentiated. Importantly, this genetic divergence is associated with differences in the seasonal spawning time of A. tenuis between the two regions, with Indonesian populations dominated by ‘spring’ spawners and Western Australian populations dominated by ‘autumn’ spawners, indicating that spawning season has an important influence on genetic structure. Furthermore, negligible gene flow between Indonesia and Western Australia indicates that the recolonization of inshore Western Australian populations since the Last Glacial Maximum was independent of input from Indonesian populations.
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Acknowledgements
Special thanks go to Yvette Hitchen for all her help with the laboratory work, Peter Rosser and Eamon Dorricott for their help with the Indonesian field work, Madeline van Oppen for providing the GBR samples, James Gilmour for practical support and ecological guidance during collection and analysis of the WA data, Luke Thomas for constructive reflection on the results and JP Rippe and an anonymous reviewer for their helpful comments on the manuscript. Data from Western Australia were collected as part of the Scott Reef program supported by Woodside Energy Ltd as operator for and on behalf of the Browse Joint Venture (BJV—Woodside Browse Pty Ltd, Shell Australia Pty Ltd, BP Developments Australia Pty Ltd, Japan Australia LNG (MIMI Browse) Pty Ltd and PetroChina International Investment (Australia) Pty Ltd). Co-Author J. N. Underwood is supported by the Woodside Coral Reef Research Fellowship. Samples from Indonesia were collected under Natalie Rosser’s research permit No. 1/TKPIPA/FRP/SM/I/2012, and NLR gratefully received funding from a Holsworth Wildlife Endowment Grant and a UWA Convocation award.
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Rosser, N.L., Edyvane, K., Malina, A.C. et al. Geography and spawning season drive genetic divergence among populations of the hard coral Acropora tenuis from Indonesia and Western Australia. Coral Reefs 39, 989–999 (2020). https://doi.org/10.1007/s00338-020-01923-9
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DOI: https://doi.org/10.1007/s00338-020-01923-9