Arid
DOI10.3389/fmicb.2012.00422
Pyrosequencing analysis of the protist communities in a High Arctic meromictic lake: DNA preservation and change
Charvet, Sophie1,2; Vincent, Warwick F.1,3; Comeau, Andre1,2; Lovejoy, Connie1,2
通讯作者Lovejoy, Connie
来源期刊FRONTIERS IN MICROBIOLOGY
ISSN1664-302X
出版年2012
卷号3
英文摘要

High Arctic meromictic lakes are extreme environments characterized by cold temperatures, low nutrient inputs from their polar desert catchments and prolonged periods of low irradiance and darkness. These lakes are permanently stratified with an oxygenated freshwater layer (mixolimnion) overlying a saline, anoxic water column (monimolimnion). The physical and chemical properties of the deepest known lake of this type in the circumpolar Arctic, Lake A, on the far northern coast of Ellesmere Island, Canada, have been studied over the last 15 years, but little is known about the lake’s biological communities. We applied high-throughput sequencing of the V4 region of the 18S ribosomal RNA gene to investigate the protist communities down the water column at three sampling times: under the ice at the end of winter in 2008, during an unusual period of warming and ice-out the same year, and again under the ice in mid-summer 2009. Sequences of many protist taxa occurred throughout the water column at all sampling times, including in the deep anoxic layer where growth is highly unlikely. Furthermore, there were sequences for taxonomic groups including diatoms and marine taxa, which have never been observed in Lake A by microscopic analysis. However, the sequences of other taxa such as ciliates, chrysophytes, Cercozoa, and Telonema varied with depth, between years and during the transition to ice-free conditions. These seasonally active taxa in the surface waters of the lake are thus sensitive to depth and change with time. DNA from these taxa is superimposed upon background DNA from multiple internal and external sources that is preserved in the deep, cold, largely anoxic water column.


英文关键词Arctic anoxic climate change meromictic phytoplankton polar lakes protists
类型Article
语种英语
国家Canada
收录类别SCI-E
WOS记录号WOS:000208863600422
WOS关键词RIBOSOMAL-RNA GENE ; ICE-COVERED LAKE ; DEEP-SEA ; MICROBIAL EUKARYOTES ; ELLESMERE-ISLAND ; O-2/H2S GRADIENT ; COASTAL WATERS ; RARE BIOSPHERE ; SP CILIOPHORA ; DIVERSITY
WOS类目Microbiology
WOS研究方向Microbiology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172432
作者单位1.Univ Laval, Dept Biol, Quebec City, PQ G1V 0A6, Canada;
2.Quebec Ocean, Quebec City, PQ, Canada;
3.Ctr Etud Nord, Quebec City, PQ, Canada
推荐引用方式
GB/T 7714
Charvet, Sophie,Vincent, Warwick F.,Comeau, Andre,et al. Pyrosequencing analysis of the protist communities in a High Arctic meromictic lake: DNA preservation and change[J],2012,3.
APA Charvet, Sophie,Vincent, Warwick F.,Comeau, Andre,&Lovejoy, Connie.(2012).Pyrosequencing analysis of the protist communities in a High Arctic meromictic lake: DNA preservation and change.FRONTIERS IN MICROBIOLOGY,3.
MLA Charvet, Sophie,et al."Pyrosequencing analysis of the protist communities in a High Arctic meromictic lake: DNA preservation and change".FRONTIERS IN MICROBIOLOGY 3(2012).
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