|The archaebacterial communities in Antarctic bathypelagic sediments|Gillan, D.C.; Danis, B. (2007). The archaebacterial communities in Antarctic bathypelagic sediments. Deep-Sea Res., Part II, Top. Stud. Oceanogr. 54(16-17): 1682-1690. dx.doi.org/10.1016/j.dsr2.2007.07.002
In: Deep-Sea Research, Part II. Topical Studies in Oceanography. Pergamon: Oxford. ISSN 0967-0645, more
archaebacteria; crenarchaeota-; sediments; antarctic; 16S rDNA; marine
16S ribosomal DNA clone library analysis was performed to assess archaeal diversity within three surficial sediment samples obtained from the bathypelagic zone (depth: 2165-3406 in) of the Weddell Sea, Antarctica. The nearly complete 16S rDNA gene (1440bp) was obtained for 146 clones and 46 phylotypes were defined. The majority of the sequences (> 99%) formed three clusters within the Marine Group I Crenarchaeota. The most important cluster, with 78.8% of the clones, included Candidatus Nitrosopumilus maritimus, a mesophilic archaeon able to oxidize ammonia. The most important subgroup in that cluster was the APA4-0cm subgroup (with 62.3% of the clones). This subgroup might represent important Crenarchaeota in the functioning of the bathypelagic sedimentary ecosystems of the Weddell Sea because it dominated the clone libraries in all sampling stations, and was found in sediments separated by very large geographic distances. Only one clone grouped within the Euryarchaeota. This euryarchaeal clone could not be affiliated with any of the previously defined clusters and might represent a novel euryarchaeal lineage.