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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 ....
jillian: welcome back. here are other headlines from around the globe. the u.s. joining china and canada to complete a prisoner swap. china freed a canadian diplomat and entrepreneur in exchange for an executive of chinese global communications giant huawei technologies who had been charged with fraud. the airport on the spanish island was shut down today due to an ash cloud spewing out of a volcano that has been erupting for a week. scientists say another volcanic vent had opened up exposing islanders to possible new dangers. and today marks the end of an era for germany. after 16 years leading the country, chancellor merkel is leaving office, deciding not to seek a fifth term. voters will head to the polls tomorrow to elect the nation s new parliament. that s a look at some stories from around the globe. back here at home, the manhunt continues in california for suspects who opened fire at a los angeles metro station last ....
The president of the capital had to flee wednesday, leaving the fate of the air field in question. and british area check this out. okay. i was told the pictures were cool. british sea explorers claim they have discovered the deepest known under water volcanic vent beneath the caribbean. volcanic vents are cracks in the earth s crust, creating towers of mineral deposits or exotic sea creatures. if you don t get that, just keep looking at the pretty pictures. the vent is three miles below the surface in an area that once set the scene for the 1989 under water thriller, the abyss. so if you didn t get all that wolf, just watch the pictures again. amazing pictures. i must say. let s watch. there they are. nice pictures, tj. thank you. all right. it s almost unthinkable. a terrorist group like al qaeda with a nuclear weapon. but the experts say it is possible, and very frightening. just ahead, a look at exactly ....