PMID- 26284035 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20150818 LR - 20201001 IS - 1664-302X (Print) IS - 1664-302X (Electronic) IS - 1664-302X (Linking) VI - 6 DP - 2015 TI - Microbial community changes along the active seepage site of one cold seep in the Red Sea. PG - 739 LID - 10.3389/fmicb.2015.00739 [doi] LID - 739 AB - The active seepage of the marine cold seeps could be a critical process for the exchange of energy between the submerged geosphere and the sea floor environment through organic-rich fluids, potentially even affecting surrounding microbial habitats. However, few studies have investigated the associated microbial community changes. In the present study, 16S rRNA genes were pyrosequenced to decipher changes in the microbial communities from the Thuwal seepage point in the Red Sea to nearby marine sediments in the brine pool, normal marine sediments and water, and benthic microbial mats. An unexpected number of reads from unclassified groups were detected in these habitats; however, the ecological functions of these groups remain unresolved. Furthermore, ammonia-oxidizing archaeal community structures were investigated using the ammonia monooxygenase subunit A (amoA) gene. Analysis of amoA showed that planktonic marine habitats, including seeps and marine water, hosted archaeal ammonia oxidizers that differed from those in microbial mats and marine sediments, suggesting modifications of the ammonia oxidizing archaeal (AOA) communities along the environmental gradient from active seepage sites to peripheral areas. Changes in the microbial community structure of AOA in different habitats (water vs. sediment) potentially correlated with changes in salinity and oxygen concentrations. Overall, the present results revealed for the first time unanticipated novel microbial groups and changes in the ammonia-oxidizing archaea in response to environmental gradients near the active seepages of a cold seep. FAU - Cao, Huiluo AU - Cao H AD - Division of Life Sciences, The Hong Kong University of Science and Technology Clear Water Bay, Hong Kong. FAU - Zhang, Weipeng AU - Zhang W AD - Division of Life Sciences, The Hong Kong University of Science and Technology Clear Water Bay, Hong Kong. FAU - Wang, Yong AU - Wang Y AD - Division of Life Sciences, The Hong Kong University of Science and Technology Clear Water Bay, Hong Kong ; Sanya Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences Sanya, China. FAU - Qian, Pei-Yuan AU - Qian PY AD - Division of Life Sciences, The Hong Kong University of Science and Technology Clear Water Bay, Hong Kong. LA - eng PT - Journal Article DEP - 20150721 PL - Switzerland TA - Front Microbiol JT - Frontiers in microbiology JID - 101548977 PMC - PMC4523032 OTO - NOTNLM OT - 16S rRNA gene OT - Red Sea OT - ammonia oxidizing archaea OT - cold seep OT - pyrosequencing EDAT- 2015/08/19 06:00 MHDA- 2015/08/19 06:01 PMCR- 2015/07/21 CRDT- 2015/08/19 06:00 PHST- 2015/03/06 00:00 [received] PHST- 2015/07/06 00:00 [accepted] PHST- 2015/08/19 06:00 [entrez] PHST- 2015/08/19 06:00 [pubmed] PHST- 2015/08/19 06:01 [medline] PHST- 2015/07/21 00:00 [pmc-release] AID - 10.3389/fmicb.2015.00739 [doi] PST - epublish SO - Front Microbiol. 2015 Jul 21;6:739. doi: 10.3389/fmicb.2015.00739. eCollection 2015.