Early skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.

Abstract Ostreobium sp. (Bryopsidales, Ulvophyceae) is a major microboring alga involved in tropical reef dissolution, with a proposed symbiotic lifestyle in living corals. However, its diversity and colonization dynamics in host’s early life stages remained unknown. Here, we mapped microborer distr...

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Autores principales:	A. Massé, I. Domart-Coulon, S. Golubic, D. Duché, A. Tribollet
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3bbb74d9612342249d1fbe6b246d92ca
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spelling	oai:doaj.org-article:3bbb74d9612342249d1fbe6b246d92ca2021-12-02T15:07:48ZEarly skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.10.1038/s41598-018-20196-52045-2322https://doaj.org/article/3bbb74d9612342249d1fbe6b246d92ca2018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-20196-5https://doaj.org/toc/2045-2322Abstract Ostreobium sp. (Bryopsidales, Ulvophyceae) is a major microboring alga involved in tropical reef dissolution, with a proposed symbiotic lifestyle in living corals. However, its diversity and colonization dynamics in host’s early life stages remained unknown. Here, we mapped microborer distribution and abundance in skeletons of the branching coral Pocillopora damicornis from the onset of calcification in primary polyps (7 days) to budding juvenile colonies (1 and 3 months) growing on carbonate and non-carbonate substrates pre-colonized by natural biofilms, and compared them to adult colonies (in aquarium settings). Primary polyps were surprisingly already colonized by microboring filaments and their level of invasion depended on the nature of settlement substrate and the extent of its pre-colonization by microborers. Growth of early coral recruits was unaffected even when microborers were in close vicinity to the polyp tissue. In addition to morphotype observations, chloroplast-encoded rbcL gene sequence analyses revealed nine new Ostreobium clades (OTU99%) in Pocillopora coral. Recruits and adults shared one dominant rbcL clade, undetected in larvae, but also present in aquarium seawater, carbonate and non-carbonate settlement substrates, and in corals from reef settings. Our results show a substratum-dependent colonization by Ostreobium clades, and indicate horizontal transmission of Ostreobium-coral associations.A. MasséI. Domart-CoulonS. GolubicD. DuchéA. TribolletNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-11 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q A. Massé I. Domart-Coulon S. Golubic D. Duché A. Tribollet Early skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.
description	Abstract Ostreobium sp. (Bryopsidales, Ulvophyceae) is a major microboring alga involved in tropical reef dissolution, with a proposed symbiotic lifestyle in living corals. However, its diversity and colonization dynamics in host’s early life stages remained unknown. Here, we mapped microborer distribution and abundance in skeletons of the branching coral Pocillopora damicornis from the onset of calcification in primary polyps (7 days) to budding juvenile colonies (1 and 3 months) growing on carbonate and non-carbonate substrates pre-colonized by natural biofilms, and compared them to adult colonies (in aquarium settings). Primary polyps were surprisingly already colonized by microboring filaments and their level of invasion depended on the nature of settlement substrate and the extent of its pre-colonization by microborers. Growth of early coral recruits was unaffected even when microborers were in close vicinity to the polyp tissue. In addition to morphotype observations, chloroplast-encoded rbcL gene sequence analyses revealed nine new Ostreobium clades (OTU99%) in Pocillopora coral. Recruits and adults shared one dominant rbcL clade, undetected in larvae, but also present in aquarium seawater, carbonate and non-carbonate settlement substrates, and in corals from reef settings. Our results show a substratum-dependent colonization by Ostreobium clades, and indicate horizontal transmission of Ostreobium-coral associations.
format	article
author	A. Massé I. Domart-Coulon S. Golubic D. Duché A. Tribollet
author_facet	A. Massé I. Domart-Coulon S. Golubic D. Duché A. Tribollet
author_sort	A. Massé
title	Early skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.
title_short	Early skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.
title_full	Early skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.
title_fullStr	Early skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.
title_full_unstemmed	Early skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.
title_sort	early skeletal colonization of the coral holobiont by the microboring ulvophyceae ostreobium sp.
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/3bbb74d9612342249d1fbe6b246d92ca
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Early skeletal colonization of the coral holobiont by the microboring Ulvophyceae Ostreobium sp.

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