Filamentous bacteria inhabiting the sheaths of marine Thioploca spp. on the 
Chilean continental shelf

Teske, A.; Jørgensen, B. B.; Gallardo, V. A.

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Filamentous bacteria inhabiting the sheaths of marine Thioploca spp. on the Chilean continental shelf

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Teske, A.
Department of Molecular Ecology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Jørgensen, B. B.
Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Teske, A., Jørgensen, B. B., & Gallardo, V. A. (2009). Filamentous bacteria inhabiting the sheaths of marine Thioploca spp. on the Chilean continental shelf. FEMS Microbiology Ecology, 68(2), 164-172.

Cite as: https://hdl.handle.net/21.11116/0000-0001-CC52-D

Abstract

A new component of the benthic Thioploca mat microbial ecosystem on the Chilean continental shelf was detected by epifluorescence microscopy: filamentous, bacterial endobionts of 4–5-μm filament diameter and length sometimes exceeding 1 mm. These filaments were identified as growing within Thioploca sheaths located between the sediment surface and c. 5 cm depth. Their location coincided with maximal biomass and biovolume of Thioploca filaments in surficial sediments, and with maximal abundance and activity of sulfate-reducing bacterial populations near the sediment/water interface. FISH and environmental characteristics support the working hypothesis that these endobiont populations are members of the filamentous, sulfate-reducing bacterial genus Desulfonema. Found at several sampling stations over a decade-long interval (1994–2006), these populations appear to be a stable component of the Chilean Thioploca mat ecosystem.