Distribution of archaeal lipids in surface water suspened particulate matter of Pearl River Estuary

Guo Wei; Ye Feng; Jia Guodong

doi:10.3969/j.issn.0253-4193.2017.08.001

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Guo Wei, Ye Feng, Jia Guodong. Distribution of archaeal lipids in surface water suspened particulate matter of Pearl River Estuary[J]. Haiyang Xuebao, 2017, 39(8): 1-15. doi: 10.3969/j.issn.0253-4193.2017.08.001

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Guo Wei, Ye Feng, Jia Guodong. Distribution of archaeal lipids in surface water suspened particulate matter of Pearl River Estuary[J]. Haiyang Xuebao, 2017, 39(8): 1-15. doi: 10.3969/j.issn.0253-4193.2017.08.001

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Distribution of archaeal lipids in surface water suspened particulate matter of Pearl River Estuary

doi: 10.3969/j.issn.0253-4193.2017.08.001

1.
Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pohllution, East China University of Technology, Nanchang 330013, China;Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
3.
Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

Received Date: 2016-11-09
Rev Recd Date: 2017-02-16

Abstract

Abstract

Isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs) are biomarkers of archaea. TEX₈₆ is a sea surface temperature (SST) proxy based on the distribution of cyclic moieties of isoGDGTs and has been widely applied to reconstruct paleo-SST in numerous cases. In this study, the distributions of isoGDGTs from surface water suspened particulate matter (SPM) during the four seasons in Pearl River Estuary (PRE, water depth below 30 m) and it's coastal waters are reported. The results showed that the major sources of isoGDGTs are in situ Methanogen in freshwater, while in estuarine brackish water, the sources of isoGDGTs are in situ Thaumarchaeota and Euryarchaeota. The input of terrigenous isoGDGTs exerted an influence on freshwater in May and August, which was inconspicuous in the estuary. The ratio of GDGT-2 to GDGT-3(GDGT-[2]/[3]) and fractional abundance of GDGT-Cren' (Cren'%) were less than 4 and 4%, respectively, which are clearly different from those in surface sediments of deep basin of South China Sea (SCS). This indicates that archaeal sources of isoGDGTs in the PRE are different from those in surface sediments of SCS, which may result in the deviation of TEX₈₆-based temperatures from actual water temperatures in PRE. The variation in fractional abundance of GDGT-2 and GDGT-3 in surface water SPM of PRE and SCS may relate to the spatial changes in relative proportion in Group Ⅰ Thaumarchaeota and Group Ⅱ Euryarchaeota. The TEX₈₆-based temperatures of isoGDGTs were higher than actual surface water temperatures in February, whereas they were lower than actual surface water temperatures in other months in the PRE. This may be attributed to the seasonal variation of relative proportion in Group Ⅰ Thaumarchaeota and Group Ⅱ Euryarchaeota. The isoGDGTs from surface water SPM of the PRE were most and least abundant in November and August, respectively, suggesting high and low in situ aquatic Archaeal production in the two months, respectively. Statistical analysis showed that water temperature, NH₄⁺ and dissolved oxygen (DO) concentration in water column are the most important factors affecting the distribution of isoGDGTs in PRE.
- Pearl River Estuary,
- isoGDGTs,
- TEX₈₆,
- surface water SPM,
- seasonal variation

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References(44)

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