Identifying how past environmental conditions shaped the evolution of corals and their skeletal traits provides a framework for predicting their persistence and that of their non-calcifying relatives under impending global warming and ocean acidification. Here we show that ocean geochemistry, particularly aragonite–calcite seas, drives patterns of morphological evolution in anthozoans (corals, sea anemones) by examining skeletal traits in the context of a robust, time-calibrated phylogeny. The lability of skeletal composition among octocorals suggests a greater ability to adapt to changes in ocean chemistry compared with the homogeneity of the aragonitic skeleton of scleractinian corals. Pulses of diversification in anthozoans follow mass extinctions and reef crises, with sea anemones and proteinaceous corals filling empty niches as tropical reef builders went extinct. Changing environmental conditions will likely diminish aragonitic reef-building scleractinians, but the evolutionary history of the Anthozoa suggests other groups will persist and diversify in their wake.
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NSF #1457817 and #1457581 provided funding to C.S.M. and E.R. and ARC DECRA (DE170100516) provided funding to P.F.C. A few specimens were collected during the R/V Atlantis DEEPSEARCH cruise (E. Cordes, chief scientist), which was funded by the US Department of the Interior, Bureau of Ocean Energy Management, Environmental Studies Program, Washington DC, under contract number M17PC00009 and on the R/V Celtic Explorer supported by the Marine Institute’s Shiptime Programme (L. Allcock, chief scientist). A. Pentico, F. Guitierrez, S. Goldman, S. Moaleman and M. Taylor helped with lab work. N. Bezio created outlined illustrations and A. Siqueira helped create the tip density plot. C. Oliveros, B. Smith and S. Ho provided guidance in divergence dating analyses. We thank A. Collins, L. Dueñas, D. Erwin, V. Gonzalez, G. Sahwell and S. Tweedt for helpful discussions and J. McCormack and W. Tsai for use of the sonicator at Occidental College. T. Bridge, M. Daly, M. Taylor, C. Prada and J. Sánchez provided specimens. Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the US Government.
The authors declare no competing interests
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Acropora sp. (Scleractinia, stony coral), Javania sp. (Scleractinia, solitary stony coral), Corynactis annulata (Corallimorpharia, naked coral), Telopathes magna (Antipatharia, black coral); Hexacorals middle row, left to right: Relicanthus cf. daphneae (Actiniaria, anemone), Actiniidae sp. (Actiniaria, anemone), Zoanthus sansibaricus (Zoantharia, colonial anemone), Ceriantharia (Ceriantharia, tube anemone); Octocorals bottom row, left to right: Plexaurella nutans and Gorgonia ventalina (Alcyonacea, holaxonian gorgonians), Anthomastus sp. (Alcyonacea, soft coral), Keratoisidinae (Alcyonacea, calcaxonian gorgonian), Virgularia cf. gustaviana (Pennatulacea, sea pen). Photographs taken by C.S. McFadden, J. D. Reimer, or courtesy of NOAA Office of Ocean Exploration and Research.
BEAST2 dated phylogeny with 95% highest posterior densities (blue bars) of node ages and red circles to denote fossil calibration points.
ASTRAL III species tree with posterior probabilities calculated in ASTRAL.
Net diversification rates (speciation minus extinction) across deep time. A) calculated between mass extinction events (solid lines) and reef crises (*), and B) between aragonite-calcite sea intervals (dotted lines).
Number of loci recovered for each species in anthozoan sub-classes and class Medusozoa. *=loci extracted from genomes.
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Quattrini, A.M., Rodríguez, E., Faircloth, B.C. et al. Palaeoclimate ocean conditions shaped the evolution of corals and their skeletons through deep time. Nat Ecol Evol 4, 1531–1538 (2020). https://doi.org/10.1038/s41559-020-01291-1
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