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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 ....
Early Inhabitants of the Bahamas Radically Altered the Environment eos.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from eos.org Daily Mail and Mail on Sunday newspapers.
Quick and Dramatic Transformation of the Bahamas Pete J van Hengstum and his team of researchers drew their new environmental conclusions from evidence gathered at the Blackwood Sinkhole , which they explained in the paper holds near-perfectly preserved organic materials from the last 3,000 years. Using core samples and radiocarbon dating , the team examined charcoal deposits from human fires that they say dated to “thousands of years ago, according to PNAS. This information helped them to determine that the first settlers arrived in the Bahamas much earlier than previously thought. Hengstum explained that the oldest archaeological sites in the southernmost Bahamian archipelago are found on the Turks and Caicos Islands and these indicate human arrival around 700 AD. Previous evidence suggested it may have taken hundreds of years for the Lucayans to move through the Bahamian archipelago that spans about 500 miles (894 km). Until now, in the northern Bahamian Great ....
Coastal News Today | World - Study: Bahamas Were Settled Earlier Than Believed coastalnewstoday.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from coastalnewstoday.com Daily Mail and Mail on Sunday newspapers.
Study: Bahamas Were Settled Earlier Than Believed Humans were present in Florida by 14,000 years ago, and until recently, it was believed the Bahamas – located only a few miles away – were not colonized until about 1,000 years ago. But new findings from a team including a Texas A&M University at Galveston researcher prove that the area was colonized earlier, and the new settlers dramatically changed the landscape. Peter van Hengstum, associate professor in the Department of Marine and Coastal Environment Science at Texas A&M-Galveston, and colleagues have had their findings published in Researchers generated a new environmental record from the Blackwood Sinkhole, which is flooded with 120 feet of groundwater without dissolved oxygen. This is important because it has pristinely preserved organic material for the last 3,000 years. Using core samples and radiocarbon dating, the team examined charcoal deposits from human fires thousands of years ago, indicating that ....