Microbial methane cycling in the Lei-Gong-Huo mud volcano of eastern Taiwan.
碩士 === 國立臺灣大學 === 地質科學研究所 === 99 === Mud volcanoes and cold seeps are important geological features that facilitate the export of microbial and/or thermogenic hydrocarbons from deep sources to the overlying seawater and/or atmosphere. Understanding how microbial communities are regulated in terrestr...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Others |
Language: | zh-TW |
Published: |
2011
|
Online Access: | http://ndltd.ncl.edu.tw/handle/20435834985902663776 |
id |
ndltd-TW-099NTU05138008 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-TW-099NTU051380082015-10-28T04:07:30Z http://ndltd.ncl.edu.tw/handle/20435834985902663776 Microbial methane cycling in the Lei-Gong-Huo mud volcano of eastern Taiwan. 台灣東部雷公火泥火山之微生物甲烷循環 Yung-Hsin Chang 張永欣 碩士 國立臺灣大學 地質科學研究所 99 Mud volcanoes and cold seeps are important geological features that facilitate the export of microbial and/or thermogenic hydrocarbons from deep sources to the overlying seawater and/or atmosphere. Understanding how microbial communities are regulated in terrestrial mud volcanoes would facilitate to unravel the carbon cycles linking deep and shallow reservoirs. The objective of this study was to characterize microbial communities associated with bubbling fluid and sediments along depth in two sites of the Lei-Gong-Huo mud volcano in eastern Taiwan. These sites were chosen (BF: bubbling fluid; site A: 0.34 meter from venting center; site B: 1.53 meter from venting center) in order to investigate how fluid flux would shape the community structures. Site comparisons revealed that anaerobic, halophillic, salt-tolerated microorganisms were prevalent in both sites. Iron to methane transition occurred at depths of 5-9 cm and 29 cm in site A where archaeal populations were dominated by ANME-2a. The abundances of ANME-2a were positively correlated with those of Desulfomonas/Pelobacter sp., suggesting that anaerobic methanotrophy is coupled to the metal reduction. Methanogenesis primarily catalyzed by methylotrophic methanogens were actived at 9-27 cm depths of site A and shallow intervals of site B. Bacterial communities were highly diverse and composed of different assemblages. Dominant bacterial members switched from Desulfuromonas, Pelobacter, Marinobacter and uncultured Bacteroidetes-related microorganisms in site A to Thiohalophilus and uncultured Bacteroidetes-related microorganisms in site B. The molecular evidence combined with geochemical characteristics revealed that the interplay between the upwelling, hydrocarbon-rich fluids, and downward atmospheric oxygen is essential to regulate community assemblages and functional expressions in mud volcanoes. Methane emission in the mud volcanoes was controlled by microbial processes. Near the venting site, methane is consumed by iron-dependent anaerobic oxidation of methane. Far from the venting site, methane produced from methanogen was directly realeased to atmosphere. Li-Hung Lin 林立虹 2011 學位論文 ; thesis 101 zh-TW |
collection |
NDLTD |
language |
zh-TW |
format |
Others
|
sources |
NDLTD |
description |
碩士 === 國立臺灣大學 === 地質科學研究所 === 99 === Mud volcanoes and cold seeps are important geological features that facilitate the export of microbial and/or thermogenic hydrocarbons from deep sources to the overlying seawater and/or atmosphere. Understanding how microbial communities are regulated in terrestrial mud volcanoes would facilitate to unravel the carbon cycles linking deep and shallow reservoirs. The objective of this study was to characterize microbial communities associated with bubbling fluid and sediments along depth in two sites of the Lei-Gong-Huo mud volcano in eastern Taiwan. These sites were chosen (BF: bubbling fluid; site A: 0.34 meter from venting center; site B: 1.53 meter from venting center) in order to investigate how fluid flux would shape the community structures.
Site comparisons revealed that anaerobic, halophillic, salt-tolerated microorganisms were prevalent in both sites. Iron to methane transition occurred at depths of 5-9 cm and 29 cm in site A where archaeal populations were dominated by ANME-2a. The abundances of ANME-2a were positively correlated with those of Desulfomonas/Pelobacter sp., suggesting that anaerobic methanotrophy is coupled to the metal reduction. Methanogenesis primarily catalyzed by methylotrophic methanogens were actived at 9-27 cm depths of site A and shallow intervals of site B. Bacterial communities were highly diverse and composed of different assemblages. Dominant bacterial members switched from Desulfuromonas, Pelobacter, Marinobacter and uncultured Bacteroidetes-related microorganisms in site A to Thiohalophilus and uncultured Bacteroidetes-related microorganisms in site B.
The molecular evidence combined with geochemical characteristics revealed that the interplay between the upwelling, hydrocarbon-rich fluids, and downward atmospheric oxygen is essential to regulate community assemblages and functional expressions in mud volcanoes. Methane emission in the mud volcanoes was controlled by microbial processes. Near the venting site, methane is consumed by iron-dependent anaerobic oxidation of methane. Far from the venting site, methane produced from methanogen was directly realeased to atmosphere.
|
author2 |
Li-Hung Lin |
author_facet |
Li-Hung Lin Yung-Hsin Chang 張永欣 |
author |
Yung-Hsin Chang 張永欣 |
spellingShingle |
Yung-Hsin Chang 張永欣 Microbial methane cycling in the Lei-Gong-Huo mud volcano of eastern Taiwan. |
author_sort |
Yung-Hsin Chang |
title |
Microbial methane cycling in the Lei-Gong-Huo mud volcano of eastern Taiwan. |
title_short |
Microbial methane cycling in the Lei-Gong-Huo mud volcano of eastern Taiwan. |
title_full |
Microbial methane cycling in the Lei-Gong-Huo mud volcano of eastern Taiwan. |
title_fullStr |
Microbial methane cycling in the Lei-Gong-Huo mud volcano of eastern Taiwan. |
title_full_unstemmed |
Microbial methane cycling in the Lei-Gong-Huo mud volcano of eastern Taiwan. |
title_sort |
microbial methane cycling in the lei-gong-huo mud volcano of eastern taiwan. |
publishDate |
2011 |
url |
http://ndltd.ncl.edu.tw/handle/20435834985902663776 |
work_keys_str_mv |
AT yunghsinchang microbialmethanecyclingintheleigonghuomudvolcanoofeasterntaiwan AT zhāngyǒngxīn microbialmethanecyclingintheleigonghuomudvolcanoofeasterntaiwan AT yunghsinchang táiwāndōngbùléigōnghuǒníhuǒshānzhīwēishēngwùjiǎwánxúnhuán AT zhāngyǒngxīn táiwāndōngbùléigōnghuǒníhuǒshānzhīwēishēngwùjiǎwánxúnhuán |
_version_ |
1718114027365728256 |