Changes in microbial communities in coastal sediments along natural CO2 gradients at a volcanic vent in Papua New Guinea.

摘要: Natural CO2 venting systems can mimic conditions that resemble intermediate to high pCO2 levels as predicted for our future oceans. They represent ideal sites investigate potential long-term effects of ocean acidification on marine life. To test whether microbes are affected by prolonged exposure levels, we examined the composition and diversity microbial communities in oxic sandy sediments along a natural gradient. Increasing was accompanied higher bacterial richness strong increase rare members both archaeal communities. Microbial from with concentrations close today's had different structures than those elevated levels. We also observed increasing sequence abundance several organic matter degrading types Flavobacteriaceae Rhodobacteraceae, which paralleled concurrent shifts benthic cover enhanced primary productivity. With pCO2, sequences related nitrifying organisms such Nitrosococcus Nitrospirales decreased, affiliated ammonia-oxidizing Thaumarchaeota Nitrosopumilus maritimus increased. Our study suggests community structure diversity, likely key ecosystem functions, may be altered coastal end century.