scholarly journals Community Structure of Lithotrophically-Driven Hydrothermal Microbial Mats from the Mariana Arc and Back-Arc

2017 ◽  
Vol 8 ◽  
Author(s):  
Kevin W. Hager ◽  
Heather Fullerton ◽  
David A. Butterfield ◽  
Craig L. Moyer
Keyword(s):  
Community Structure ◽  
Microbial Mats ◽  
Mariana Arc ◽  
Back Arc

scholarly journals Comparative Metagenomics of Two Microbial Mats at Cuatro Ciénegas Basin II: Community Structure and Composition in Oligotrophic Environments

Astrobiology ◽  
2012 ◽  
Vol 12 (7) ◽  
pp. 659-673 ◽  
Author(s):  
Germán Bonilla-Rosso ◽  
Mariana Peimbert ◽  
Luis David Alcaraz ◽  
Ismael Hernández ◽  
Luis E. Eguiarte ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Mats ◽  
Comparative Metagenomics ◽  
Cuatro Ciénegas ◽  
Cuatro Ciénegas Basin

scholarly journals A salinity and sulfate manipulation of hypersaline microbial mats reveals stasis in the cyanobacterial community structure

2008 ◽  
Vol 2 (5) ◽  
pp. 457-470 ◽  
Author(s):  
Stefan J Green ◽  
Cameron Blackford ◽  
Patricia Bucki ◽  
Linda L Jahnke ◽  
Lee Prufert-Bebout
Keyword(s):  
Community Structure ◽  
Microbial Mats ◽  
Cyanobacterial Community ◽  
Hypersaline Microbial Mats

U–Pb ages of Miocene near-trench granitic rocks of the Southwest Japan arc: implications for magmatism related to hot subduction

2019 ◽  
Vol 158 (1) ◽  
pp. 47-71 ◽  
Author(s):  
Hironao Shinjoe ◽  
Yuji Orihashi ◽  
Ryo Anma
Keyword(s):  
Middle Miocene ◽  
Japan Sea ◽  
Wide Distribution ◽  
Granitic Rocks ◽  
Philippine Sea Plate ◽  
Kii Peninsula ◽  
The Japan Sea ◽  
Igneous Activity ◽  
Mariana Arc ◽  
Back Arc

AbstractWe present a new dataset of zircon U–Pb ages that document igneous activity in the SW Japan arc during middle Miocene time and discuss its relationship with the opening of the Japan Sea, Philippine Sea plate migration, and subduction of the young hot lithosphere of the Shikoku Basin. Precursory magmatism, characterized by dike and stock intrusions, started c. 15.6 Ma in both Kyushu and the Kii Peninsula. Most plutonism occurred between 15.5 and 13.5 Ma in an area 600 km long and 150 km wide. No along-arc trend was recognized in the U–Pb ages of igneous activity near the trench. Our data indicate that all near-trench middle Miocene igneous activity occurred immediately after the opening of the Japan Sea ceased, i.e. after 16 Ma, implying that melt extraction and the emplacement of granites in the near-trench region had some influence on the back-arc opening. Our data also imply that the trench–trench–trench-type triple junction between the Japan arc and the Izu–Bonin–Mariana arc must have reached the east side of the Kii Peninsula by 15.6 Ma. The wide distribution of contemporaneous magmatic activity along the arc requires a trench-parallel heat source, such as the subduction of a trench-parallel ridge or a young and highly segmented ridge–fracture zone system in addition to the hot wedge mantle condition related to the opening of Japan Sea.

Community structure and pigment organisation of cyanobacteria-dominated microbial mats in Antarctica

1993 ◽  
Vol 28 (4) ◽  
pp. 213-221 ◽  
Author(s):  
W.F. Vincent ◽  
M.T. Downes ◽  
R.W. Castenholz ◽  
C. Howard-Williams
Keyword(s):  
Community Structure ◽  
Microbial Mats

scholarly journals Microbial Diversity of Pinnacle and Conical Microbial Mats in the Perennially Ice-Covered Lake Untersee, East Antarctica

2020 ◽  
Vol 11 ◽  
Author(s):  
Carla Greco ◽  
Dale T. Andersen ◽  
Ian Hawes ◽  
Alexander M. C. Bowles ◽  
Marian L. Yallop ◽  
...  
Keyword(s):  
Community Structure ◽  
18S Rrna ◽  
High Throughput Sequencing ◽  
Microbial Mats ◽  
East Antarctica ◽  
Rrna Genes ◽  
Microbial Composition ◽  
Small Spatial Scale ◽  
Lake Floor ◽  
18S Rrna Genes

Antarctic perennially ice-covered lakes provide a stable low-disturbance environment where complex microbially mediated structures can grow. Lake Untersee, an ultra-oligotrophic lake in East Antarctica, has the lake floor covered in benthic microbial mat communities, where laminated organo-sedimentary structures form with three distinct, sympatric morphologies: small, elongated cuspate pinnacles, large complex cones and flat mats. We examined the diversity of prokaryotes and eukaryotes in pinnacles, cones and flat microbial mats using high-throughput sequencing of 16S and 18S rRNA genes and assessed how microbial composition may underpin the formation of these distinct macroscopic mat morphologies under the same environmental conditions. Our analysis identified distinct clustering of microbial communities according to mat morphology. The prokaryotic communities were dominated by Cyanobacteria, Proteobacteria, Verrucomicrobia, Planctomycetes, and Actinobacteria. While filamentous Tychonema cyanobacteria were common in all mat types, Leptolyngbya showed an increased relative abundance in the pinnacle structures only. Our study provides the first report of the eukaryotic community structure of Lake Untersee benthic mats, which was dominated by Ciliophora, Chlorophyta, Fungi, Cercozoa, and Discicristata. The eukaryote richness was lower than for prokaryote assemblages and no distinct clustering was observed between mat morphologies. These findings suggest that cyanobacterial assemblages and potentially other bacteria and eukaryotes may influence structure morphogenesis, allowing distinct structures to form across a small spatial scale.

scholarly journals Community structure and physiological characterization of microbial mats in Byers Peninsula, Livingston Island (South Shetland Islands, Antarctica)

2007 ◽  
Vol 59 (2) ◽  
pp. 377-385 ◽  
Author(s):  
Eduardo Fernández-Valiente ◽  
Antonio Camacho ◽  
Carlos Rochera ◽  
Eugenio Rico ◽  
Warwick F. Vincent ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Mats ◽  
South Shetland Islands ◽  
Shetland Islands ◽  
Physiological Characterization ◽  
Livingston Island
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