High total organic carbon in surface waters of the northern Arabian Gulf: Implications for the oxygen minimum zone of the Arabian Sea

2018 ◽  
Vol 129 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Turki Al-Said ◽  
S.W.A. Naqvi ◽  
Faiza Al-Yamani ◽  
Alexandr Goncharov ◽  
Loreta Fernandes
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Surface Waters ◽  
Arabian Sea ◽  
Arabian Gulf ◽  
Oxygen Minimum Zone ◽  
High Total Organic Carbon ◽  
Minimum Zone ◽  
Oxygen Minimum

scholarly journals Distribution of Membrane Lipids of Planktonic Crenarchaeota in the Arabian Sea

2002 ◽  
Vol 68 (6) ◽  
pp. 2997-3002 ◽  
Author(s):  
Jaap S. Sinninghe Damsté ◽  
W. Irene C. Rijpstra ◽  
Ellen C. Hopmans ◽  
Fredrick G. Prahl ◽  
Stuart G. Wakeham ◽  
...  
Keyword(s):  
Surface Waters ◽  
Arabian Sea ◽  
Membrane Lipids ◽  
Oxygen Minimum Zone ◽  
Central Pacific ◽  
Central Pacific Ocean ◽  
Biological Studies ◽  
Intact Core ◽  
Minimum Zone ◽  
Oxygen Minimum

ABSTRACT Intact core tetraether membrane lipids of marine planktonic Crenarchaeota were quantified in water column-suspended particulate matter obtained from four depth intervals (∼70, 500, 1,000 and 1,500 m) at seven stations in the northwestern Arabian Sea to investigate the distribution of the organisms at various depths. Maximum concentrations generally occurred at 500 m, near the top of the oxygen minimum zone, and the concentrations at this depth were, in most cases, slightly higher than those in surface waters. In contrast, lipids derived from eukaryotes (cholesterol) and from eukaryotes and bacteria (fatty acids) were at their highest concentrations in surface waters. This indicates that these crenarchaeotes are not restricted to the photic zone of the ocean, which is consistent with the results of recent molecular biological studies. Since the Arabian Sea has a strong oxygen minimum zone between 100 and 1,000 m, with minimum oxygen levels of <1 μM, the abundance of crenarchaeotal membrane lipids at 500 m suggests that planktonic Crenarchaeota are probably facultative anaerobes. The cell numbers we calculated from the concentrations of membrane lipids are similar to those reported for the Central Pacific Ocean, supporting the recent estimation of M. B. Karner, E. F. DeLong, and D. M. Karl ( Nature 409 : 507-510, 2001 ) that the world's oceans contain ca. 1028 cells of planktonic Crenarchaeota.

scholarly journals Dark carbon fixation in the Arabian Sea oxygen minimum zone contributes to sedimentary organic carbon (SOM)

2019 ◽  
Vol 33 (12) ◽  
pp. 1715-1732 ◽  
Author(s):  
Sabine K. Lengger ◽  
Darci Rush ◽  
Jan Peter Mayser ◽  
Jerome Blewett ◽  
Rachel Schwartz‐Narbonne ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Arabian Sea ◽  
Carbon Fixation ◽  
Oxygen Minimum Zone ◽  
Sedimentary Organic Carbon ◽  
Minimum Zone ◽  
Dark Carbon Fixation ◽  
Oxygen Minimum

scholarly journals Dark carbon fixation contributes to sedimentary organic carbon in the Arabian Sea oxygen minimum zone

2019 ◽  
Author(s):  
Sabine Lengger ◽  
Darci Rush ◽  
Jan Mayser ◽  
Jerome Blewett ◽  
Rachel Schwartz-Narbonne ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Arabian Sea ◽  
Carbon Fixation ◽  
Oxygen Minimum Zone ◽  
Sedimentary Organic Carbon ◽  
Minimum Zone ◽  
Dark Carbon Fixation ◽  
Oxygen Minimum

Temporally invariable bacterial community structure in the Arabian Sea oxygen minimum zone

2014 ◽  
Vol 73 (1) ◽  
pp. 51-67 ◽  
Author(s):  
A Jain ◽  
M Bandekar ◽  
J Gomes ◽  
D Shenoy ◽  
RM Meena ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum

Denitrification exceeds anammox as a nitrogen loss pathway in the Arabian Sea oxygen minimum zone

2010 ◽  
Vol 57 (3) ◽  
pp. 384-393 ◽  
Author(s):  
Silvia E. Bulow ◽  
Jeremy J. Rich ◽  
Hema S. Naik ◽  
Anil K. Pratihary ◽  
Bess B. Ward
Keyword(s):  
Arabian Sea ◽  
Nitrogen Loss ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum

A 43 kyr record of protist communities and their response to oxygen minimum zone variability in the Northeastern Arabian Sea

2018 ◽  
Vol 496 ◽  
pp. 248-256 ◽  
Author(s):  
Kuldeep D. More ◽  
William D. Orsi ◽  
Valier Galy ◽  
Liviu Giosan ◽  
Lijun He ◽  
...  
Keyword(s):  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum

scholarly journals Macrobenthic assemblage structure and organismal stoichiometry control faunal processing of particulate organic carbon and nitrogen in oxygen minimum zone sediments

2012 ◽  
Vol 9 (3) ◽  
pp. 993-1006 ◽  
Author(s):  
W. R. Hunter ◽  
L. A. Levin ◽  
H. Kitazato ◽  
U. Witte
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Oxygen Minimum Zone ◽  
Oxygen Availability ◽  
Assemblage Structure ◽  
Sediment Geochemistry ◽  
Sea Floor ◽  
Carbon And Nitrogen ◽  
Minimum Zone ◽  
Oxygen Minimum

Abstract. The Arabian Sea oxygen minimum zone (OMZ) impinges on the western Indian continental margin between 150 and 1500 m, causing gradients in oxygen availability and sediment geochemistry at the sea floor. Oxygen availability and sediment geochemistry are important factors structuring macrofaunal assemblages in marine sediments. However, relationships between macrofaunal assemblage structure and sea-floor carbon and nitrogen cycling are poorly understood. We conducted in situ 13C:15N tracer experiments in the OMZ core (540 m [O2] = 0.35 μmol l–1) and lower OMZ boundary (800–1100 m, [O2] = 2.2–15.0 μmol l–1) to investigate how macrofaunal assemblage structure, affected by different oxygen levels, and C:N coupling influence the fate of particulate organic matter. No macrofauna were present in the OMZ core. Within the OMZ boundary, relatively high abundance and biomass resulted in the highest macrofaunal assimilation of particulate organic carbon (POC) and nitrogen (PON) at the lower oxygen 800 m stations ([O2] = 2.2–2.36 μmol l–1). At these stations the numerically dominant cirratulid polychaetes exhibited greatest POC and PON uptake. By contrast, at the higher oxygen 1100 m station ([O2] = 15.0 μmol l–1) macrofaunal C and N assimilation was lower, with POC assimilation dominated by one large solitary ascidian. Macrofaunal POC and PON assimilation were influenced by changes in oxygen availability, and significantly correlated to differences in macrofaunal assemblage structure between stations. However, macrofaunal feeding responses were ultimately characterised by preferential organic nitrogen assimilation, relative to their internal C:N budgets.

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