title: Tissue-associated "Candidatus Mycoplasma corallicola" and filamentous bacteria on the cold-water coral Lophelia pertusa (Scleractinia).
abstract: The cold-water coral Lophelia pertusa (Scleractinia, Caryophylliidae) is a key species in the formation of cold-water reefs, which are among the most diverse deep-sea ecosystems. It occurs in two color varieties: white and red. Bacterial communities associated with Lophelia have been investigated in recent years, but the role of the associated bacteria remains largely obscure. This study uses catalyzed reporter deposition fluorescence in situ hybridization to detect the in situ location of specific bacterial groups on coral specimens from the Trondheimsfjord (Norway). Two tissue-associated groups were identified: (i) bacteria on the host's tentacle ectoderm, "Candidatus Mycoplasma corallicola," are flasklike, pointed cells and (ii) endoderm-associated bona fide TM7 bacteria form long filaments in the gastral cavity. These tissue-bound bacteria were found in all coral specimens from the Trondheimsfjord, indicating a closer relationship with the coral compared to bacterial assemblages present in coral mucus and gastric fluid.
authors.affiliation: Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, D-27570 Bremerhaven, Germany. sneulinger@ifm-geomar.de
authors.forename: Sven C
authors.initials: SC
authors.lastname: Neulinger
authors.forename: Andrea
authors.initials: A
authors.lastname: Gärtner
authors.forename: Johanna
authors.initials: J
authors.lastname: Järnegren
authors.forename: Martin
authors.initials: M
authors.lastname: Ludvigsen
authors.forename: Karin
authors.initials: K
authors.lastname: Lochte
authors.forename: Wolf-Christian
authors.initials: WC
authors.lastname: Dullo
mesh_terms: D000818:Animals; D037421:Anthozoa / Q000382:microbiology*; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D009664:Norway