Publication Date:
2021-07-13
Description:
Hot Lake is a recently described thermal brine
pool off Panarea Island (Eolian Islands, Italy) where emitted
fluids are highly saline and rich in CO2 and H2S. The
prokaryotic community composition in surface sediment
samples was analyzed by high-throughput Illumina
sequencing targeting the V3 region of the 16S rRNA at two
time points that differed mainly with respect to temperature
conditions, high-temperature (94 °C, HT09) and low-temperature
(28.5 °C, LT10). Bacterial richness and diversity
were greater than those of Archaea under both temperature
conditions. In contrast to Bacteria, diversity and evenness
of Archaea greatly increased at LT10. While the phylogenetic
analysis indicated the presence of members mostly
affiliated with the same taxonomic groups, their relative
abundances differed from HT09 to LT10, resulting in different
bacterial and archaeal assemblages. Both HT09 and
LT10 were dominated by members of the Epsilonproteobacteria.
Within this subphylum, bacteria of the genus Sulfurimonas
were most frequently detected at HT09, while
Arcobacter prevailed at LT10. The abundance of other dominant taxonomic groups (≥1 % of Illumina reads) also
correlated with temperature conditions. Members assigned
to hyperthermophilic Euryarchaeota (Thermococci) or to
thermophilic (Caldiserica) and thermoresistant (Firmicutes)
bacterial taxa were dominant at HT09, while those
related to non-thermophilic Bacteroidetes, Fusobacteria
and Actinobacteria were dominant at LT10. Several, probably
photosynthetic, members of the Alphaproteobacteria,
Chlorobi, Cyanobacteria and Chloroflexi were recovered
under both temperature conditions. The co-occurrence of
photosynthetic and chemolithotrophic microorganisms represents
a unique feature of shallow vents such as Hot Lake
Description:
Published
Description:
547-559
Description:
3A. Ambiente Marino
Description:
JCR Journal
Description:
restricted
Keywords:
Microbial diversity
;
Shallow Idrthermal systems
;
03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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