Patterns of bacteria-host associations suggest different ecological strategies between two reef building cold-water coral species

Abstract : Cold-watercorals(CWC)aremainecosystemengineersofthedeepsea,andtheirreefsconstitutehot- spots ofbiodiversity.However,theirecologyremainspoorlyunderstood,particularly,thenatureofthe holobiont formedbycoralswiththeirassociatedbacterialcommunities.Here,weanalyzed Madrepora oculata and Lophelia pertusa samples, collectedfromonelocationinaMediterraneancanyonintwo different seasons(autumnandspring),inordertotestforspeciesspecificity andtemporalstabilityofthe host-bacteria associations.The16SrRNAsequencingrevealedhost-specific patternsofbacterialcom- munities associatedwith L. pertusa and M. oculata, both intermsofcommunitycompositionanddi- versity.Allanalyzed M. oculata polyps exhibitedtemporallyandspatiallysimilarbacterialcommunities dominated byhaplotypeshomologoustotheknowncnidarians-associatedgenus Endozoicomonas. In contrast, thebacterialcommunitiesassociatedwith L. pertusa variedamongpolypsfromthesamecol- ony,aswellasamongdistinctcoloniesandbetweenseasons.Whiletheresilientconsortiumformedby M. oculata and itsbacterialcommunity fit thedefinition ofholobiont,theversatilityofthe L. pertusa microbiome suggeststhatthisassociationismoreinfluenced bytheenvironmentalconditionsornu- tritional status.Ourresultsthushighlightdistincthost/microbesassociationstrategiesforthesetwo closely relatedScleractinianssharingthesamehabitat,suggestingdistinctsensitivitytoenvironmental change.
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Submitted on : Thursday, October 13, 2016 - 10:56:58 AM
Last modification on : Friday, May 24, 2019 - 5:03:09 PM

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Anne.-Leila Meistertzheim, Franck Lartaud, Sophie Arnaud-Haond, Dimitri Kalenitchenko, Manon Bessalam, et al.. Patterns of bacteria-host associations suggest different ecological strategies between two reef building cold-water coral species. Deep Sea Research Part I: Oceanographic Research Papers, Elsevier, 2016, 114, pp.12-22. ⟨10.1016/j.dsr.2016.04.013⟩. ⟨hal-01380580⟩

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