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Frontiers | Subsurface Microbial Community Composition in Anchialine Environments Is Influenced by Original Organic Carbon Source at Time of Deposition

Prokaryotes constitute the majority of sedimentary biomass, where they cycle organic carbon and regulate organic matter transformation. The microbes inhabiting sediment are diverse, and the factors controlling microbial community composition are not fully understood. Here, we characterized the prokaryotic community using 16S rRNA gene sequencing in 24 stratigraphic layers within a 89 cm (dated to ~1900 years old) sediment core from an anchialine sinkhole in the Bahamas with a stratified water column and anoxic bottom water. The microbial community was dominated by members of the Alphaproteobacteria, Dehalococcoidia, Gammaproteobacteria, Bathyarchaeota, and Campylobacter classes. Most interestingly, subsurface microbial community structure could be correlated to previous evidence for timewise changes in the main source of organic matter that was supplied to the sediment accumulating during the last 2000 years, which itself was caused by regional terrestrial vegetation changes. The C:N r ....

United States , Black Sea , Oceans General , New York , Central Abaco , Papua New Guinea , Abaco Island , Great Abaco Island , South China Sea , Brunei General , Yax Chen , Quintana Roo , Baja California , Texas City , Tidal Flat , The Bahamas , Obligately Organohalide , Rhone Prodelta , Atlantic Ocean , Van Rijswijk , Rhizobiaceae Salter , Chloroflexi Cetecio , Dneasy Powersoil , Pelagibacterales Clade , Van Beusekom , Dehalococcoides Mccartyi Gen ,

"Sediment budget of a river-fed wave-dominated coastal compartment" by Rafael C. Carvalho and Colin D. Woodroffe

A sediment compartment approach is an appropriate framework within which to undertake planning and management of coastal environments, and a hierarchical scheme has been adopted by several state governments in Australia. This study applies a geospatial comparison of terrain modelling to estimate decadal-scale sediment transfer in a closed wave-dominated coastal compartment in southeastern Australia. The Shoalhaven River, one of the larger rivers in southern New South Wales, drains from a temperate catchment of 7151 km2 into Shoalhaven Bight, a secondary compartment. The river has infilled the barrier estuary at its mouth in recent millennia, and delivers sediment that nourishes a well-developed strandplain to its north. We estimate sediment yield from the heterogeneous catchment based on deposition between 2003 and 2014 bathymetric surveys in a reservoir formed as a result of dam construction. Delivery of ~86,000 m3/y to the estuarine channel was calculated, adopting a known trap effic ....

Seven Mile Beach , Shoalhaven Heads , New South Wales , Shoalhaven Bight , Shoalhaven River , Closed Compartment , Oastal Compartments , Coastal Management , Coastal Sediments , Luvial Supply , Olumetric Change ,