Abstract
Parental effects on early life history stages of corals are poorly understood, but with severe environmental disturbances, these impacts may be increasingly important in understanding future coral survival trajectories on reefs. This study investigated whether parental bleaching of Montipora capitata in 2015 influenced symbiont community composition and offspring size three years after recovery. In July 2018, gametes were collected from Reef 13 in Kāneʻohe Bay, Oʻahu, Hawaiʻi, and made selective crosses to produce three different parental phenotype histories: (1) both parents previously bleached (“bleached” phenotype), (2) both parents previously non-bleached (“non-bleached” phenotype), and (3) crosses from a combination of both parental histories (“crossed” phenotype). Parental bleaching history affected the symbiont community composition in three different life history stages—parents, gametes, and larvae, with the bleached phenotype dominated by Cladocopium and non-bleached phenotype dominated by Durusdinium. Symbiont densities were also different between bleaching phenotypes in parents and gamete bundles but not in larvae, with non-bleached phenotypes having slightly higher symbiont densities than their bleached counterparts. Larvae from each phenotype were then exposed to either ambient or high-temperature conditions for 72 h and larvae from bleached phenotype parents were smallest regardless of temperature treatment, indicating maternal effects beyond the direct transmission of symbionts to the offspring. With these findings, larval recruitment to the reef from previously bleached parents is suspected to decline as ocean warming becomes more frequent and severe, potentially leading to generational symbiont community shifts. The direct heritability of thermal tolerance from parent to offspring in M. capitata provides opportunities for restoration by selectively breeding for traits that may increase community resilience to thermal stress.
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Data availability
Raw data and code are available at github.com/druryc/parent_offspring_symbionts.
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Acknowledgements
We thank Josh Hancock, Jennifer Davidson, Kira Hughes, and the Gates Coral Lab for their help collecting gametes during the 2018 spawning event. Coral fragments and gamete bundles were collected under Hawaii DLNR permit SAP 2018-03 to HIMB. This work was funded by the Paul G. Allen Family Foundation. We dedicate this work to Ruth Gates, who encouraged us to think creatively about the future of coral reefs. This is HIMB contribution 1908 and SOEST contribution 11586.
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CIH, CD, and NKB developed and executed the experiment. CIH, CD, and NKB collected the data. CIH processed samples and analyzed data with guidance from CD and ACB. CIH wrote the manuscript. All authors edited and approved the final version.
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Fig. S1
Below is the link to the electronic supplementary material.Fig. S1 Temperature data from conical treatments 0–72 hours post-fertilization. Pictures of larvae were taken at 72 h. Color codes indicate the 6 treatments: ambient bleached (light blue), ambient cross (blue), ambient non-bleached (dark blue), high bleached (light red), high cross (red), and high non-bleached (dark red) (EPS 397 kb)
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Harris, C.I., Bean, N.K., Baker, A.C. et al. Stable symbiont communities persist in parents, gametes, and larvae of Montipora capitata across historical bleaching phenotypes. Coral Reefs 41, 1627–1636 (2022). https://doi.org/10.1007/s00338-022-02305-z
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DOI: https://doi.org/10.1007/s00338-022-02305-z