Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s00248-006-9055-7 |
Hypolithic cyanobacteria, dry limit of photosynthesis, and microbial ecology in the hyperarid Atacama Desert | |
Warren-Rhodes, Kimberley A.; Rhodes, Kevin L.; Pointing, Stephen B.; Ewing, Stephanie A.; Lacap, Donnabella C.; Gomez-Silva, Benito; Amundson, Ronald; Friedmann, E. Imre; McKay, Christopher P. | |
通讯作者 | Warren-Rhodes, Kimberley A. |
来源期刊 | MICROBIAL ECOLOGY |
ISSN | 0095-3628 |
EISSN | 1432-184X |
出版年 | 2006 |
卷号 | 52期号:3页码:389-398 |
英文摘要 | The occurrence of hypolithic cyanobacteria colonizing translucent stones was quantified along the aridity gradient in the Atacama Desert in Chile, from less arid areas to the hyperarid core where photosynthetic life and thus primary production reach their limits. As mean rainfall declines from 21 to <= 2 mm year(-1), the abundance of hypolithic cyanobacteria drops from 28 to < 0.1%, molecular diversity declines threefold, and organic carbon residence times increase by three orders of magnitude. Communities contained a single Chroococcidiopsis morphospecies with heterotrophic associates, yet molecular analysis revealed that each stone supported a number of unique 16S rRNA gene-defined genotypes. A fivefold increase in steady-state residence times for organic carbon within communities in the hyperarid core (3200 years turnover time) indicates a significant decline in biological carbon cycling. Six years of microclimate data suggest that the dry limit corresponds to <= 5 mm year(-1) rainfall and/or decadal periods of no rain, with < 75 h year(-1) of liquid water available to cyanobacteria under light conditions suitable for photosynthesis. In the hyperarid core, hypolithic cyanobacteria are rare and exist in small spatially isolated islands amidst a microbially depauperate bare soil. These findings suggest that photosynthetic life is extremely unlikely on the present-day surface of Mars, but may have existed in the past. If so, such microhabitats would probably be widely dispersed, difficult to detect, and millimeters away from virtually lifeless surroundings. |
类型 | Article |
语种 | 英语 |
国家 | USA ; Peoples R China ; Chile |
收录类别 | SCI-E |
WOS记录号 | WOS:000242464700003 |
WOS关键词 | GRADIENT GEL-ELECTROPHORESIS ; 16S RIBOSOMAL-RNA ; LIQUID WATER ; MARS ; DESERTIFICATION ; MICROORGANISMS ; DIVERSITY ; ARIDITY ; CHILE |
WOS类目 | Ecology ; Marine & Freshwater Biology ; Microbiology |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Microbiology |
来源机构 | University of California, Berkeley |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/152502 |
作者单位 | (1)NASA, Ames Res Ctr, Moffett Field, CA 94035 USA;(2)Univ Calif Berkeley, Dept Environm Sci, Policy & Management Ecosyst Sci Div, Berkeley, CA 94720 USA;(3)Univ Hawaii, Dept Agr Forestry & Nat Resource Management, Hilo, HI 96720 USA;(4)Univ Hong Kong, Dept Ecol & Biodivers, Hong Kong, Hong Kong, Peoples R China;(5)Univ Antofagasta, Dept Biomed, Antofagasta, Chile;(6)Univ Antofagasta, Inst Desierto, Antofagasta, Chile |
推荐引用方式 GB/T 7714 | Warren-Rhodes, Kimberley A.,Rhodes, Kevin L.,Pointing, Stephen B.,et al. Hypolithic cyanobacteria, dry limit of photosynthesis, and microbial ecology in the hyperarid Atacama Desert[J]. University of California, Berkeley,2006,52(3):389-398. |
APA | Warren-Rhodes, Kimberley A..,Rhodes, Kevin L..,Pointing, Stephen B..,Ewing, Stephanie A..,Lacap, Donnabella C..,...&McKay, Christopher P..(2006).Hypolithic cyanobacteria, dry limit of photosynthesis, and microbial ecology in the hyperarid Atacama Desert.MICROBIAL ECOLOGY,52(3),389-398. |
MLA | Warren-Rhodes, Kimberley A.,et al."Hypolithic cyanobacteria, dry limit of photosynthesis, and microbial ecology in the hyperarid Atacama Desert".MICROBIAL ECOLOGY 52.3(2006):389-398. |
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