Sources of organic matter and microbial community structure in the sediments of the Visakhapatnam harbour, east coast of India

Harji, Ranjita; Bhosle, N.B.; Garg, Anita; Sawant, Sanghapal D.; Krishnamurthy, V.

doi:10.1016/j.chemgeo.2010.06.015

Cited by 21 publications

(15 citation statements)

References 59 publications

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“…A technique that involves the incorporation of stable or radiocarbon isotopes into microbial PLFAs was used to identify and understand the carbon sources of organic matter that support bacterial production (Tolosa et al 2003;Druffel et al 2010). Using this approach, Harji et al (2010) revealed that terrestrial carbon accounted for 37-100 % of total organic carbon in sediments of the harbour in Visakhapatnam. Based on the fatty acid composition and d 13 C fatty acids, it has been found that bacteria within the sediments were dependent on the marine source of organic matter and mainly utilised a labile pool of organic matter that was derived from algae (Hu et al 2006).…”

Section: Microbial Diversity In Sedimentsmentioning

confidence: 99%

“…Despite these limitations, FAME analysis has been used to characterise microbial communities in aquifer environments and sediments in some studies (Elvert et al 2003;Knief et al 2003;Dias et al 2009). Consequently, PLFA analysis is generally preferred for microbiological studies of such environments (Salomonová et al 2003;Harji et al 2010;Pratt et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Microbial diversity in waters, sediments and microbial mats evaluated using fatty acid-based methods

Mrozik

Nowak

Piotrowska‐Seget

2013

Int. J. Environ. Sci. Technol.

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The review summarises recent advances towards a greater comprehensive assessment of microbial diversity in aquatic environments using the fatty acid methyl esters and phospholipid fatty acids approaches. These methods are commonly used in microbial ecology because they do not require the culturing of micro-organisms, are quantitative and reproducible and provide valuable information regarding the structure of entire microbial communities. Because some fatty acids are associated with taxonomic and functional groups of micro-organisms, they allow particular groups of micro-organisms to be distinguished. The integration of fatty acid-based methods with stable isotopes, RNA and DNA analyses enhances our knowledge of the role of micro-organisms in global nutrient cycles, functional activity and phylogenetic lineages within microbial communities. Additionally, the analysis of fatty acid profiles enables the shifts in the microbial diversity in pristine and contaminated environments to be monitored. The main objective of this review is to present the use of lipid-based approaches for the characterisation of microbial communities in water columns, sediments and biomats.

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Section: Microbial Diversity In Sedimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microbial diversity in waters, sediments and microbial mats evaluated using fatty acid-based methods

Mrozik

Nowak

Piotrowska‐Seget

2013

Int. J. Environ. Sci. Technol.

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“…C 18:1ω9c and C 18:1ω9t fatty acids were other two major MUFAs in the surface sediments. Previous studies reported that C 18:1ω9t is produced by bacteria from corresponding cis isomer under conditions of stress (Kieft et al 1994;Fang et al 2004;Harji et al 2010). High concentration of C 18:1ω9t was obtained around the Cochin harbour region (stations 2, 3, 4) and southern tip of the study area.…”

Section: Sources Of Sedimentary Organic Matter As Indicated By Fatty mentioning

confidence: 89%

Distribution and sources of aliphatic hydrocarbons and fatty acids in surface sediments of a tropical estuary south west coast of India (Cochin estuary)

Gireeshkumar

Deepulal

Chandramohanakumar

2015

Environ Monit Assess

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Surface sediments samples from the Cochin estuary were measured for elemental, stable isotopic and molecular biomarkers (aliphatic hydrocarbons and fatty acids) to study the sources and distribution of sedimentary organic matter. Concentrations of total organic carbon (TOC), total nitrogen (TN) and stable isotopic ratios of carbon (δ(13)C) ranged from 0.62 to 2.74 %, 0.09 to 0.25 % and -27.5 to 21.7 ‰, respectively. Sedimentary n-alkanes ranged from 6.03 to 43.23 μg g(-1) with an average of 16.79 μg g(-1), while total fatty acids varied from 22.55 to 440.69 μg g(-1). The TOC/TN ratios and δ(13)C suggest a mixture of marine- and terrestrial-derived organic matter in the surface sediments with increasing contributions from marine-derived organic matter towards the seaward side. Long-chain n-alkanes derived from higher plants predominated the inner part of the estuary, while short-chain n-alkanes derived from planktonic sources predominated the bar mouth region. The even carbon preference of the C12-C22 n-alkanes may refer to the direct biogenic contribution from bacteria, fungi and yeast species and to the potential direct petroleum inputs. The presence of odd mid-chain n-alkanes in the sediments indicates the organic matter inputs from submerged and floating macrophytes (water hyacinth). Various molecular indices such as carbon preference index, terrestrial to aquatic ratio, average chain length and the ratios of mid-chain n-alkanes support the aforementioned inferences. The high contribution of odd and branched chain fatty acids along with very low contribution of polyunsaturated fatty acids, suggest the effective utilisation of algae-derived organic matter by bacteria and the effective recycling of labile organic matter in whole settling and deposition processes. The distributional variability of n-alkanes and fatty acids reveals the preferential utilisation of marine-derived organic matter and the selective preservation of terrestrial-derived organic matter in surface sediments of the Cochin estuary.

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“…(a) Abundance (µg g −1 TOC) variations of short-chain n-alkanoic acids (sum of n-C 14 , n-C 16 , and n-C 18 alkanoic acids), long-chain nalkanoic acids (sum of n-C 24 , n-C 26 , n-C 28 , and n-C 30 alkanoic acids), (b) 10-methyl-C 16:0 , C 18:2 ω6, and (c) i + ai-C 15 and i + ai-C 17 in the core. C 22:6 ω3 ( Figure 4b) indicates a significant contribution from bacteria decomposing the deposited algae (Volkman et al, 2007): 10-methyl-C 16:0 FA is characteristic of sulfate reducing bacteria (Elvert et al, 2003;Wakeham et al, 2007;Zimmerman and Canuel, 2000), whereas i + ai-C 15 and i + ai-C 17 FAs are well known biomarkers for Gram positive bacteria, Gram negative anaerobes, and sulfate reducing bacteria (Harji et al, 2010). The close abundance correlations between 10-methyl-C 16:0 and i + ai-C 15 (or i + ai-C 17 ) FAs (R 2 = 0.99 and 0.91, respectively, n = 30) suggest that sulfate reducing bacteria were the source of the branched FAs in the core.…”

Section: Origin and Preservation Of Sediment Ommentioning

confidence: 97%

Geochemical records of anoxic water mass expansion in an oligotrophic alpine lake (Yunnan Province, SW China) in response to climate warming since the 1980s

Zhang

Liu

et al. 2016

The Holocene

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In order to elucidate the effect of recent warming, we studied lipid biomarkers and trace elements in a dated sediment core from Lake Heihai, a small, deep, and ultraoligotrophic alpine lake in Yunnan Province (SW China), being only marginally affected by anthropogenic activities. The variation in lipid biomarkers (such as 10-methyl-C 16:0 fatty acid (FA), iso-branched C 15 (i-C 15 ) and anteiso-branched C 15 (ai-C 15 ) FA, and tetrahymanol) suggests a rapid productivity increase in sulfate reducing bacteria and ciliates since 1980, likely reflecting expansion of the hypolimnion anoxia and a prolonged duration of an oxic-anoxic chemocline in the water column. The concentrations of element molybdenum (Mo) in pre-1980 sediments approach the values in average crust. After 1980, the concentration increased, reaching levels approximately sixfold higher than the initial abundances. This likely reflects a high authigenic Mo deposition when the bottom water was more anoxic and enrichment in H 2 S. The suggested spatial and temporal expansion of the anoxic bottom water since 1980 was probably a response to the regional climate warming, resulting in stronger water column stratification and terrestrial grass inputs to the lake, and thus higher dissolved oxygen (DO) loss in hypolimnion.

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Sources of organic matter and microbial community structure in the sediments of the Visakhapatnam harbour, east coast of India

Cited by 21 publications

References 59 publications

Microbial diversity in waters, sediments and microbial mats evaluated using fatty acid-based methods

Microbial diversity in waters, sediments and microbial mats evaluated using fatty acid-based methods

Distribution and sources of aliphatic hydrocarbons and fatty acids in surface sediments of a tropical estuary south west coast of India (Cochin estuary)

Geochemical records of anoxic water mass expansion in an oligotrophic alpine lake (Yunnan Province, SW China) in response to climate warming since the 1980s

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