Crustose coralline algae that promote coral larval settlement harbor distinct surface bacterial communities
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Crustose coralline algae that promote coral larval settlement harbor distinct surface bacterial communities Nachshon Siboni1,2 • David Abrego1,3 • Eneour Puill-Stephan1 • William L. King2,4,7 David G. Bourne1,5 • Jean-Baptiste Raina2 • Justin R. Seymour2 • Tilmann Harder6
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Received: 30 March 2020 / Accepted: 19 August 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Most benthic invertebrates, including ecosystem engineers such as corals, sponges and bivalves, have a motile planktonic larval phase and rely on specific chemical cues to identify a suitable substrate to settle. Crustose coralline algae (CCA) can induce settlement and metamorphosis responses in many invertebrates including corals. We tested the respective coral settlement capacity of multiple CCA species in a choice experiment and investigated the composition of their microbiomes. Our findings
Topic Editor Morgan S. Pratchett Nachshon Siboni and David Abrego have contributed equally to this work.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00338-020-01997-5) contains supplementary material, which is available to authorized users. & Nachshon Siboni [email protected] 1
Australian Institute of Marine Science, Townsville, QLD 4810, Australia
2
Climate Change Cluster (C3), University of Technology Sydney, Ultimo, NSW 2007, Australia
3
National Marine Science Centre, Southern Cross University, Coffs Harbour, NSW 2450, Australia
4
The School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia
5
College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia
6
Faculty of Biology and Chemistry, University of Bremen, Bremen, Germany
7
Present Address: Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University, University Park, PA, USA
revealed that coral larval settlement was drastically influenced by CCA genera and also suggest that bacterial communities on the CCA surface can potentially serve as a driver of coral larval settlement. The composition of the bacterial communities on the surface of the least attractive CCA genus, Neogoniolithon fosliei, was markedly different from the other genera, Porolithon gardineri and Titanoderma prototypum and was significantly enriched in Vibrio and Flammeovirgaceae. The activity of CCA-associated bacterial communities may contribute to some of the variability observed in settlement responses between CCA species. Specific bacterial ASVs assigned to the Neptuniibacter, Methylotrophic Group 3 and Cellvibrionaceae were positively correlated with coral settlement. Conversely, ASVs assigned as Vibrio and Flammeovirga were negatively correlated with coral settlement. This study identifies putative bacterial taxa involved in coral settlement, which is an essential step to understand the chemical cues involved in this process and to predict the ability of corals to recolonize damaged reefs following disturbances. Keywords Coral L
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