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Community structure of subsurface biofilms in the thermal sulfidic caves ofAcquasanta Terme, Italy.

ABSTRACT: We performed a microbial community analysis of biofilms inhabiting thermal (35 to 50 degrees C) waters more than 60 m below the ground surface near Acquasanta Terme, Italy. The groundwater hosting the biofilms has 400 to 830 microM sulfide, <10 microM O(2), pH of 6.3 to 6.7, and specific conductivity of 8,500 to 10,500 microS/cm. Based on the results of 16S rRNA gene cloning and fluorescent in situ hybridization (FISH), the biofilms have low species richness, and lithoautotrophic (or possibly mixotrophic) Gamma- and Epsilonproteobacteria are the principle biofilm architects. Deltaproteobacteria sequences retrieved from the biofilms have <90% 16S rRNA similarity to their closest relatives in public databases and may represent novel sulfate-reducing bacteria. The Acquasanta biofilms share few species in common with Frasassi cave biofilms (13 degrees C, 80 km distant) but have a similar community structure, with representatives in the same major clades. The ecological success of Sulfurovumales-group Epsilonproteobacteria in the Acquasanta biofilms is consistent with previous observations of their dominance in sulfidic cave waters with turbulent water flow and high dissolved sulfide/oxygen ratios.

SUBMITTER: Jones DS

PROVIDER: S-EPMC2935061 | biostudies-literature | 2010 Sep

REPOSITORIES: biostudies-literature

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Community structure of subsurface biofilms in the thermal sulfidic caves ofAcquasanta Terme, Italy.

Jones D S DS Tobler D J DJ Schaperdoth I I Mainiero M M Macalady J L JL

Applied and environmental microbiology 20100716 17

We performed a microbial community analysis of biofilms inhabiting thermal (35 to 50 degrees C) waters more than 60 m below the ground surface near Acquasanta Terme, Italy. The groundwater hosting the biofilms has 400 to 830 microM sulfide, <10 microM O(2), pH of 6.3 to 6.7, and specific conductivity of 8,500 to 10,500 microS/cm. Based on the results of 16S rRNA gene cloning and fluorescent in situ hybridization (FISH), the biofilms have low species richness, and lithoautotrophic (or possibly mi ...[more]

PMID: 20639361

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Project description:In order to reveal the community characteristics and trophic structure of oribatid mites in different moss habitats in karst caves, the oribatid mites in the moss habitats of ground (GD), understory (US), cave wall (CW), surface shrub (SB) and farmland (FL) outside the cave were collected in October 2021. Through the identification and data analysis of oribatid mites, 2352 oribatid mites were found, belonging to 45 families and 72 genera, most of which were Gymnonota. The family number, genus number, individual number, individual density, dominant genus composition, community diversity, community similarity, MGP (Analysis methods for ecological groups of oribatid mites) ecological group of oribatid mites and trophic structure of oribatid mites in different moss were analyzed. The results showed that: (1) The number of families, genera, individuals, and individual density of SB and FL are higher than those of the other three habitats; (2) Platyliodes, Oppiella, Tectocepheus, Scutovertex, Scheloribates and Trichogalumna are the dominant genera of the oribatid mites in the cave moss habitat, among them, Tectocepheus and Trichogaluna have the most obvious advantages; (3) The diversity index of shrub (SB) was higher than that of other four habitats; Similarity between ground and cave wall, shrub and farmland is high; (4) The MGP ecological group of oribatid mites in different habitats is dominated by O type (Overall type belongs to MGP analysis results, 20%≤M,G,P≤50%), and a total of 42 genera of oribatid mites preliminarily constitute the trophic structure of oribatid mites in the cave moss habitat. Based on the above results, it can be concluded that there are differences in the community structure of oribatid mites in different moss habitats in the study area, and the use of dominant genera of mites can preliminarily indicate the environmental conditions of different moss habitats. This study enriches the study of mites in karst cave mosses, and can provide theoretical significance for the protection of cave biodiversity in karst areas.

Dataset Information

Community structure of subsurface biofilms in the thermal sulfidic caves ofAcquasanta Terme, Italy.

Publications

Community structure of subsurface biofilms in the thermal sulfidic caves ofAcquasanta Terme, Italy.

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