Niche differentiation among sulfur-oxidizing bacterial populations in cave waters

Citation

Material Information

Title:
Niche differentiation among sulfur-oxidizing bacterial populations in cave waters
Series Title:
The ISME Journal
Creator:
Macalady, Jennifer L
Dattagupta, Sharmishtha
Schaperdoth, Irene
Jones, Daniel S
Druschel, Greg K
Eastman, Danielle
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Beggiatoa ( local )
Epsilonproteobacteria ( local )
Frasassi Cave ( local )
Microelectrode Voltammetry ( local )
Thiothrix ( local )
Thiovirga ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The sulfidic Frasassi cave system affords a unique opportunity to investigate niche relationships among sulfur-oxidizing bacteria, including epsilonproteobacterial clades with no cultivated representatives. Oxygen and sulfide concentrations in the cave waters range over more than two orders of magnitude as a result of seasonally and spatially variable dilution of the sulfidic groundwater. A full-cycle rRNA approach was used to quantify dominant populations in biofilms collected in both diluted and undiluted zones. Sulfide concentration profiles within biofilms were obtained in situ using microelectrode voltammetry. Populations in rock-attached streamers depended on the sulfide/oxygen supply ratio of bulk water (r1⁄40.97; Po0.0001). Filamentous epsilonproteobacteria dominated at high sulfide to oxygen ratios (4150), whereas Thiothrix dominated at low ratios (o75). In contrast, Beggiatoa was the dominant group in biofilms at the sediment–water interface regardless of sulfide and oxygen concentrations or supply ratio. Our results highlight the versatility and ecological success of Beggiatoa in diffusion-controlled niches, and demonstrate that high sulfide/oxygen ratios in turbulent water are important for the growth of filamentous epsilonproteobacteria.
Original Version:
The ISME Journal, Vol. 2 (2008-03-20).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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