Sedimentary pigments and nature of organic matter within the oxygen minimum zone (OMZ) of the Eastern Arabian Sea (Indian margin)

Rasiq, K.T.; Kurian, Siby; Karapurkar, Supriya G.; Naqvi, S.W.A.

doi:10.1016/j.ecss.2016.04.013

Cited by 11 publications

(2 citation statements)

References 63 publications

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“…The sum of chloropigments-a (∑Chlns-a) in the fjord sediments (Table 1) and the potentially intensive solar irradiation in summer, which can speed up pigment degradation in water column, considerable amounts of pigments are transferred to Hornsund sediments and preserved. Although the concentrations are not high, they are comparable with values obtained for other coastal areas of different latitudes where aerobic conditions also prevailed, e.g., coastal areas of the Gdansk Basin, the Pomeranian Bay, the Venice Lagoon, and the coasts of Scotland (Szymczak-Żyła and Kowalewska 2007;Szymczak-Żyła et al 2011), Trondheimsfjord (Cibic et al 2007 and India (Rasiq et al 2016).…”

Section: Results and Interpretationsupporting

confidence: 83%

Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions

Krajewska¹,

Szymczak‐Żyła²,

Kowalewska³

2017

Polish Polar Research

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Pigments (chloropigments-a and carotenoids) in sediments and macroalgae samples, collected in Hornsund, in July 2015 and July 2016, were analysed (HPLC) in this work. In spite of the aerobic conditions and the periodic intensive solar irradiation in the Arctic environment, neither of which favour pigment preservation in water column and surface sediments, our results indicate that these compounds can provide information about phytoplankton composition, primary production and environmental conditions in this region. The sum of chloropigments-a, a marker of primary production, in the Hornsund sediments varied from 0.40 to 14.97 nmol/g d.w., while the sum of carotenoids ranged from 0.58 to 8.08 nmol/g d.w. Pheophorbides-a and pyropheophorbides-a made up the highest percentage in the sum of chloropigments-a in these sediments, supplying evidence for intensive zooplankton and/or zoobenthos grazing. Among the carotenoids, fucoxanthin and its derivatives (19'-hexanoyloxyfucoxanthin and 19'-hexanoyloxy-4-ketofucoxanthin) contributed the highest percentage, which points to the occurrence mainly of diatoms and/or haptophytes in the water. The pigment markers show that the input of macroalgae to the total biomass could be considerable only in the intertidal zone.

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Section: Results and Interpretationsupporting

confidence: 83%

Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions

Krajewska¹,

Szymczak‐Żyła²,

Kowalewska³

2017

Polish Polar Research

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“…Collectively, these features suggest that high as well as low molecular weight carbon compounds, utilizable by complex organic matter degraders and sulfate-reducers respectively, are abundant under the OMZ center. Greater preservation of labile organic matter within the OMZ center has also been insinuated in previous studies that measured chlorophyll degradation products in OMZ sediments across the eastern Arabian Sea 82 . In this context it is further noteworthy that although TOC and SRB diversity reach their maxima within the zone of high J SO4 , water-depth dependent variation profiles of the first two parameters do not exactly overlap with that of the third (Fig.…”

Section: Resultsmentioning

confidence: 83%

Enhanced carbon-sulfur cycling in the sediments of Arabian Sea oxygen minimum zone center

Fernandes¹,

Mazumdar²,

Bhattacharya³

et al. 2018

Sci Rep

120

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Biogeochemistry of oxygen minimum zone (OMZ) sediments, which are characterized by high input of labile organic matter, have crucial bearings on the benthic biota, gas and metal fluxes across the sediment-water interface, and carbon-sulfur cycling. Here we couple pore-fluid chemistry and comprehensive microbial diversity data to reveal the sedimentary carbon-sulfur cycle across a water-depth transect covering the entire thickness of eastern Arabian Sea OMZ, off the west coast of India. Geochemical data show remarkable increase in average total organic carbon content and aerial sulfate reduction rate (JSO42−) in the sediments of the OMZ center coupled with shallowing of sulfate methane transition zone and hydrogen sulfide and ammonium build–up. Total bacterial diversity, including those of complex organic matter degraders, fermentative and exoelectrogenic bacteria, and sulfate-reducers (that utilize only simple carbon compounds) were also found to be highest in the same region. The above findings indicate that higher organic carbon sequestration from the water-columns (apparently due to lower benthic consumption, biodegradation and biotransformation) and greater bioavailability of simple organic carbon compounds (apparently produced by fermetative microflora of the sediments) are instrumental in intensifying the carbon-sulfur cycle in the sediments of the OMZ center.

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Biogeochemistry of Marine Oxygen Minimum Zones with Special Emphasis on the Northern Indian Ocean

Fernandes

Mandal

Sivan

et al. 2022

Systems Biogeochemistry of Major Marine Biomes

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Sedimentary pigments and nature of organic matter within the oxygen minimum zone (OMZ) of the Eastern Arabian Sea (Indian margin)

Cited by 11 publications

References 63 publications

Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions

Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions

Enhanced carbon-sulfur cycling in the sediments of Arabian Sea oxygen minimum zone center

Biogeochemistry of Marine Oxygen Minimum Zones with Special Emphasis on the Northern Indian Ocean

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