期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 50, 页码 21208-21212出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0906149106
关键词
16S; DGGE; diversity; seasonality; succession
资金
- National Science Foundation [0520480, 0229302, 0425582, 0519840]
- Direct For Biological Sciences [1147336] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Division Of Environmental Biology [1347042, 1147378] Funding Source: National Science Foundation
- Division Of Environmental Biology [1147336] Funding Source: National Science Foundation
Natural bacterial communities are extremely diverse and highly dynamic, but evidence is mounting that the compositions of these communities follow predictable temporal patterns. We investigated these patterns with a 3-year, circumpolar study of bacterio-plankton communities in the six largest rivers of the pan-arctic watershed (Ob', Yenisey, Lena, Kolyma, Yukon, and Mackenzie), five of which are among Earth's 25 largest rivers. Communities in the six rivers shifted synchronously over time, correlating with seasonal shifts in hydrology and biogeochemistry and clustering into three groups: winter/spring, spring freshet, and summer/fall. This synchrony indicates that hemisphere-scale variation in seasonal climate sets the pace of variation in microbial diversity. Moreover, these seasonal communities reassembled each year in all six rivers, suggesting a long-term, predictable succession in the composition of big river bacterioplankton communities.
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