Abundance and phylogenetic identity of archaeoplankton in the permanent oxygen minimum zone of the eastern tropical South Pacific

被引:52
作者
Belmar, Lucy [1 ,2 ]
Molina, Veronica [1 ]
Ulloa, Osvaldo [1 ]
机构
[1] Univ Concepcion, Dept Oceanog, Ctr Invest Oceanog Pacifico Sur Oriental, Concepcion, Chile
[2] Univ Concepcion, Dept Oceanog, Programa Doctorado Oceanog, Concepcion, Chile
关键词
crenarchaea; euryarchaea; suboxic; AMMONIA-OXIDIZING ARCHAEA; MARINE PLANKTONIC ARCHAEA; IN-SITU HYBRIDIZATION; VERTICAL-DISTRIBUTION; DEEP-SEA; MESOPHILIC CRENARCHAEOTA; NITRIFYING ARCHAEA; DEFICIENT WATERS; NITROUS-OXIDE; BLACK-SEA;
D O I
10.1111/j.1574-6941.2011.01159.x
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
We assessed the abundance and molecular phylogeny of archaeoplankton in the oxygen minimum zone (OMZ) of the eastern tropical South Pacific, using specific-probe hybridization and phylogenetic analysis of the SSU-rRNA gene. Euryarchaea from Marine Group-II (MG-II) were most abundant in the surface oxic layer, representing 4.0 +/- 2.0% of the total picoplankton, while crenarchaea from Group I.1a (G-I.1a) peaked at the oxyclines, with a relative abundance of 8.1 +/- 4.3% (upper oxycline). In most of the stations, the abundance of both the groups decreased at the core of the OMZ, where a secondary maximum in cell density is commonly observed. The majority of the phylotypes affiliated with one of three groups: MG-II, euryarchaeal Marine Group-III (MG-III) and G-I.1a (75.9%, 12.8% and 10.3%, respectively). While MG-II phylotypes were found throughout the water column and G-I.1a ones were predominantly found within the oxyclines, MG-III phylotypes came almost exclusively from the OMZ core. Higher archaeal richness was found within the OMZ, with some of the exclusive lineages grouping with sequences from the deep ocean and hydrothermal vents. Moreover, G-I.1a sequences from the OMZ grouped into a different subcluster from the aerobic ammonium-oxidizer Nitrosopumilus maritimus. Thus, the community structure of archaeoplankton in OMZs is rich and distinct, with G-I.1a members particularly prominent at the oxyclines.
引用
收藏
页码:314 / 326
页数:13
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