globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12138
Scopus记录号: 2-s2.0-84930764290
论文题名:
Growth of modern branched columnar stromatolites in Lake Joyce, Antarctica
作者: Mackey T.J.; Sumner D.Y.; Hawes I.; Jungblut A.D.; Andersen D.T.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2015
卷: 13, 期:4
起始页码: 373
结束页码: 390
语种: 英语
Scopus关键词: authigenic mineral ; calcite ; community composition ; cyanobacterium ; filamentous alga ; fungus ; microbial community ; microbial mat ; microfossil ; morphology ; morphotype ; stromatolite ; water level ; Antarctica ; East Antarctica ; Lake Joyce ; Cyanobacteria ; Leptolyngbya ; Leptolyngbya fragilis ; Phormidium autumnale ; Pseudanabaena ; Antarctica ; cyanobacterium ; growth, development and aging ; lake ; microbiology ; sediment ; Antarctic Regions ; Cyanobacteria ; Geologic Sediments ; Lakes
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Modern decimeter-scale columnar stromatolites from Lake Joyce, Antarctica, show a change in branching pattern during a period of lake level rise. Branching patterns correspond to a change in cyanobacterial community composition as preserved in authigenic calcite crystals. The transition in stromatolite morphology is preserved by mineralized layers that contain microfossils and cylindrical molds of cyanobacterial filaments. The molds are composed of two populations with different diameters. Large diameter molds (>2.8 μm) are abundant in calcite forming the oldest stromatolite layers, but are absent from younger layers. In contrast, <2.3 μm diameter molds are common in all stromatolites layers. Loss of large diameter molds corresponds to the transition from smooth-sided stromatolitic columns to branched and irregular columns. Mold diameters are similar to trichome diameters of the four most abundant living cyanobacteria morphotypes in Lake Joyce: Phormidium autumnale morphotypes have trichome diameters >3.5 μm, whereas Leptolyngbya antarctica, L. fragilis, and Pseudanabaena frigida morphotypes have diameters <2.3 μm. P. autumnale morphotypes were only common in mats at <12 m depth. Mats containing abundant P. autumnale morphotypes were smooth, whereas mats with few P. autumnale morphotypes contained small peaks and protruding bundles of filaments, suggesting that the absence of P. autumnale morphotypes allowed small-scale topography to develop on mats. Comparisons of living filaments and mold diameters suggest that P. autumnale morphotypes were present early in stromatolite growth, but disappeared from the community through time. We hypothesize that the mat-smoothing behavior of P. autumnale morphotypes inhibited nucleation of stromatolite branches. When P. autumnale morphotypes were excluded from the community, potentially reflecting a rise in lake level, short-wavelength roughness provided nuclei for stromatolite branches. This growth history provides a conceptual model for initiation of branched stromatolite growth resulting from a change in microbial community composition. © 2015 John Wiley & Sons Ltd.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85142
Appears in Collections:影响、适应和脆弱性

Files in This Item:

There are no files associated with this item.


作者单位: Department of Earth and Planetary Sciences, University of California, Davis, CA, United States; Gateway Antarctica, University of Canterbury, Christchurch, New Zealand; Department of Life Sciences, The Natural History Museum, London, United Kingdom; Carl Sagan Center for the Study of Life in the Universe, SETI Institute, Mountain View, CA, United States

Recommended Citation:
Mackey T.J.,Sumner D.Y.,Hawes I.,et al. Growth of modern branched columnar stromatolites in Lake Joyce, Antarctica[J]. Geobiology,2015-01-01,13(4)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Mackey T.J.]'s Articles
[Sumner D.Y.]'s Articles
[Hawes I.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Mackey T.J.]'s Articles
[Sumner D.Y.]'s Articles
[Hawes I.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Mackey T.J.]‘s Articles
[Sumner D.Y.]‘s Articles
[Hawes I.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.