Crustose coralline algae that promote coral larval settlement harbor distinct surface bacterial communities

Siboni, Nachshon, Abrego, David, Puill-Stephan, Eneour, King, William L., Bourne, David G., Raina, Jean-Baptiste, Seymour, Justin R., and Harder, Tilmann (2020) Crustose coralline algae that promote coral larval settlement harbor distinct surface bacterial communities. Coral Reefs. (In Press)

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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 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 gardineriandTitanoderma prototypumand was significantly enriched inVibrioandFlammeovirgaceae. 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 theNeptuniibacter, Methylotrophic Group 3 and Cellvibrionaceae were positively correlated with coral settlement. Conversely, ASVs assigned asVibrioandFlammeovirgawere 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.

Item ID: 64375
Item Type: Article (Research - C1)
ISSN: 1432-0975
Keywords: Coral, Larval settlement, Crustose coralline algae, Bacterial communities, 16S rRNA
Copyright Information: (C) Springer-Verlag GmbH Germany, part of Springer Nature 2020
Funders: Australian Institute of Marine Science (AIMS)
Projects and Grants: AIMS Apppropriation Fund 2233
Date Deposited: 16 Sep 2020 07:47
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060299 Ecology not elsewhere classified @ 50%
05 ENVIRONMENTAL SCIENCES > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified @ 50%
SEO Codes: 96 ENVIRONMENT > 9699 Other Environment > 969999 Environment not elsewhere classified @ 50%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 50%
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