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Title: Microbial Associations of Abyssal Gorgonians and Anemones (>4,000 m Depth) at the Clarion-Clipperton Fracture Zone
Authors: Quintanilla, Elena
Rodrigues, Clara F
Henriques, Isabel 
Hilário, Ana
Keywords: Clarion-Clipperton Fracture Zone (CCZ); abyssal; deep-sea anemones; deep-sea corals; microbiome; polymetallic nodules
Issue Date: 2022
Project: German Ministry of Education and Science (BMBF) -project JPI Oceans “Ecological Aspects of Deep-Sea Mining" 
FCT/MCTES through CESAM (UIDP/50017/2020 C UIDB/50017/2020 C LA/P/0094/2020) funded by national funds, through the project REDEEM (PTDC/BIA-BMA/2986102/SAICT/2017) funded by FEDER within the framework of COMPETE2020 – Programa Operacional Competitividade e Internacionalizaçño (POCI) and by Portuguese funds through FCT in special support of the JPIO pilot action “Ecological aspects of deep-sea mining” and the project MiningImpact2 (JPI Mining 2017, ref. Mining2/0002/2017), program 3599-PPCDT, Ciências do Mar – Sistemas Oceânicos e do Mar Profundo. 
Serial title, monograph or event: Frontiers in Microbiology
Volume: 13
Abstract: Deep coral-dominated communities play paramount roles in benthic environments by increasing their complexity and biodiversity. Coral-associated microbes are crucial to maintain fitness and homeostasis at the holobiont level. However, deep-sea coral biology and their associated microbiomes remain largely understudied, and less from remote and abyssal environments such as those in the Clarion-Clipperton Fracture Zone (CCZ) in the tropical Northeast (NE) Pacific Ocean. Here, we study microbial-associated communities of abyssal gorgonian corals and anemones (>4,000 m depth) in the CCZ; an area harboring the largest known global reserve of polymetallic nodules that are commercially interesting for the deep-sea nodule mining. Coral samples (n = 25) belonged to Isididae and Primnoidae families, while anemones (n = 4) to Actinostolidae family. Significant differences in bacterial community compositions were obtained between these three families, despite sharing similar habitats. Anemones harbored bacterial microbiomes composed mainly of Hyphomicrobiaceae, Parvibaculales, and Pelagibius members. Core microbiomes of corals were mainly dominated by different Spongiibacteraceae and Terasakiellaceae bacterial members, depending on corals' taxonomy. Moreover, the predicted functional profiling suggests that deep-sea corals harbor bacterial communities that allow obtaining additional energy due to the scarce availability of nutrients. This study presents the first report of microbiomes associated with abyssal gorgonians and anemones and will serve as baseline data and crucial insights to evaluate and provide guidance on the impacts of deep-sea mining on these key abyssal communities.
ISSN: 1664-302X
DOI: 10.3389/fmicb.2022.828469
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

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