Phylogenetic diversity and temporal variation in the Spirochaeta populations from two Mediterranean microbial mats.
Phylogenetic diversity and temporal variation in the Spirochaeta populations from two Mediterranean microbial mats.
复制标题
来自两个地中海微生物垫的螺旋藻种群的系统发育多样性和时间变化。
DOI：
10.2436/20.1501.01.71
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发表时间：
2008-12
期刊：
影响因子：
--
通讯作者：
Guerrero R
中科院分区：
文献类型：
--
作者：
Berlanga M;Aas JA;Paster BJ;Boumenna T;Dewhirst FE;Guerrero R
Spirochetes represent one of the bacterial groups often observed in hydrogen-sulfide-rich layers from coastal microbial mats. However, relatively few spirochetes from these microbial mats have been described and characterized. We have used 16S rDNA phylogenetic analysis to investigate the spirochetal diversity of microbial mats from two different geographic locations in the western Mediterranean (Ebro Delta, Spain, and La Camargue, France). Samples from each delta was monitored in the spring and winter over 1 to 2 year’s duration. In sequence analysis of 332 clones derived from samples of both deltas, 42 novel phylotypes of not-yet-cultivated spirochetes belonging to the genus Spirochaeta were detected. None of the phylotypes were identified as known culturable species of Spirochaeta or previously identified phylotyepes cloned from other hypersaline microbial mat such as Guerrero Negro. Eight of the phylotypes were common to Ebro and Camargue mats, two of them, IF058 and LL066 are present both in spring and winter. Some phylotypes appeared to show seasonal variation, i.e. they were found only in the spring, but not in the winter. On the other hand, Ebro and Camargue phylotypes compared with phylotypes from Guerrero Negro grouped according to the vertical gradient of oxygen and sulfide in the mat. Some phylotypes, such as LH073, IE028, LH042 or LG013 are harbored in low H2S or H2S-O2 interface zone. In contrast, major phylotypes were detected presumably in deeper layers and they are likely to be strict anaerobes and high tolerance to H2S. The presence of spirochetes in different located microbial mats suggests that constitutes a very diverse and stable population involved in a well-integrated “symbiosis” (physiological-cell-cooperatively) with other gild communities in the mats to maintain a coordinated functional community.
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影响因子：
4.4
作者：
Blazejak, A;Erséus, C;Dubilier, N
通讯作者：
Dubilier, N
DOI：
10.1099/ijs.0.65727-0
发表时间：
2008-10-01
影响因子：
2.8
作者：
Imachi, Hiroyuki;Saka, Sanae;Horikoshi, Koki
通讯作者：
Horikoshi, Koki
影响因子：
2.8
作者：
GUERRERO, R;ASHEN, J;MARGULIS, L
通讯作者：
MARGULIS, L
影响因子：
2.1
作者：
Magot, M;Fardeau, ML;Patel, BKC
通讯作者：
Patel, BKC
影响因子：
2.8
作者：
FRACEK, SP;STOLZ, JF
通讯作者：
STOLZ, JF