Samples from six depths of the Black Sea's suboxic zone were analyzed for 16S rRNA gene sequence information. A gradient in phylotype diversity was found. The distributions of known anaerobic ammonium oxidation (anammox) bacteria, many unknown Planctomycetes, and other phylotypes were examined in relation to the local nutrient and redox conditions.
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http://dx.doi.org/10.1128/AEM.72.4.3079-3083.2006 | DOI Listing |
Nat Commun
January 2025
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China.
The Tonian Period (1000-720 Ma) bore witness to the transition from a prokaryote-dominated marine ecosystem to one characterized by the proliferation of eukaryotes. This fundamental shift has generally been attributed to evolving marine redox states. Here, we present sedimentological and geochemical analyses of the early Tonian Huainan, Feishui, and Huaibei groups in the Xuhuai basin of the North China craton.
View Article and Find Full Text PDFMar Pollut Bull
December 2024
CSIR - National Institute of Oceanography, Dona Paula, Goa 403004, India.
Iodine is a redox-sensitive element and a potential oxidant for the respiration of organic matter. Here we report the spatial variation of dissolved iodine in the Bay of Bengal (BoB) oxygen minimum zone (OMZ) and compare it with that of the Arabian Sea (AS). Subsurface iodide peaks were observed in the upper boundary of the OMZ, representing 20 to 70 % of the total iodine budget in the BoB.
View Article and Find Full Text PDFFront Microbiol
July 2024
Institute for Ocean Engineering, Shenzhen International Graduate School, Shenzhen, China.
The Yongle blue hole (YBH), situated in the South China Sea, represents a compelling subject of study in marine microbiology due to its unique redox-layered microbial ecosystems. However, the diversity and ecology of microbial eukaryotes within the YBH remains underexplored. This study endeavors to bridge this gap through the application of the microbial filtration and fixation (ISMIFF) device to collect 0.
View Article and Find Full Text PDFGeobiology
August 2024
Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan.
The stepwise oxygenation of Earth's surficial environment is thought to have shaped the evolutionary history of life. Microfossil records and molecular clocks suggest eukaryotes appeared during the Paleoproterozoic, perhaps shortly after the Great Oxidation Episode at ca. 2.
View Article and Find Full Text PDFNat Commun
July 2024
State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
Reactive iron (Fe) serves as an important sink of organic carbon (OC) in marine surface sediments, which preserves approximately 20% of total OC (TOC) as reactive iron-bound OC (Fe-OC). However, the fate of Fe-OC in subseafloor sediments and its availability to microorganisms, remain undetermined. Here, we reconstructed continuous Fe-OC records in two sediment cores of the northern South China Sea encompassing the suboxic to methanic biogeochemical zones and reaching a maximum age of ~100 kyr.
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