Fatty acid composition of surface sediments in the subtropical Pearl River estuary and adjacent shelf, Southern China

Hu, Jianfang; Zhang, Hongbo; Peng, Ping’an

doi:10.1016/j.ecss.2005.09.009

Cited by 82 publications

(42 citation statements)

References 41 publications

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“…SAFA are relatively resistant toward degradation. On the other hand, PUFA contain unsaturated carbon bonds that are sensitive to oxidation and are thus good proxy for very labile OM (Hu et al, 2006). Furthermore, Phyto_PUFA provide a useful insight onto the source of the OM as they are synthesized by freshwater and marine microalgae (Volkman, 2006).…”

Section: Discussionmentioning

confidence: 99%

River organic matter shapes microbial communities in the sediment of the Rhône prodelta

et al. 2014

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Microbial-driven organic matter (OM) degradation is a cornerstone of benthic community functioning, but little is known about the relation between OM and community composition. Here we use Rhô ne prodelta sediments to test the hypothesis that OM quality and source are fundamental structuring factors for bacterial communities in benthic environments. Sampling was performed on four occasions corresponding to contrasting river-flow regimes, and bacterial communities from seven different depths were analyzed by pyrosequencing of 16S rRNA gene amplicons. The sediment matrix was characterized using over 20 environmental variables including bulk parameters (for example, total nitrogen, carbon, OM, porosity and particle size), as well as parameters describing the OM quality and source (for example, pigments, total lipids and amino acids and d 13 C), and molecular-level biomarkers like fatty acids. Our results show that the variance of the microbial community was best explained by d 13 C values, indicative of the OM source, and the proportion of saturated or polyunsaturated fatty acids, describing OM lability. These parameters were traced back to seasonal differences in the river flow, delivering OM of different quality and origin, and were directly associated with several frequent bacterial operational taxonomic units. However, the contextual parameters, which explained at most 17% of the variance, were not always the key for understanding the community assembly. Co-occurrence and phylogenetic diversity analysis indicated that bacteria-bacteria interactions were also significant. In conclusion, the drivers structuring the microbial community changed with time but remain closely linked with the river OM input.

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Section: Discussionmentioning

confidence: 99%

River organic matter shapes microbial communities in the sediment of the Rhône prodelta

et al. 2014

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“…The free lipids and bound lipids were respectively isolated on the basis of traditional treatment via solvent extraction and saponification (Hu et al, 2006). Briefly, free lipids were extracted repeatedly from an aliquot of DM with a dichloromethane (DCM)/MeOH (2:1, v/v) using ultrasonic cleaner.…”

Section: Sorbent Isolationmentioning

confidence: 99%

Role of extractable and residual organic matter fractions on sorption of phenanthrene in sediments

2013

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h i g h l i g h t s" Riverine sediments were fractionated into five fractions using new methods. " A dioxane extraction procedure was applied to the separation of lignin in sediments. " Free lipid and lignin were much higher than previously reported values. " The Phen sorption for the lipid and lignin fractions was linear, whereas that for the residual fractions was nonlinear. . The sorption isotherms of phenanthrene (Phen) were examined to evaluate the importance of various fractions on sorption. A lignin extraction procedure was for the first time applied to separate the lignin or degraded lignin fraction from sediment organic matter (SOM). The extracted LG was similar to model lignin in terms of elemental ratios and sorption behavior. FL and LG fractions were quite important, as their contents were much higher than reported values. Phen sorption for the extracted fractions was almost linear, whereas that for the residual fractions was nonlinear, especially for LGF with n 0.56-0.63. As the different organic fractions were removed sequentially, sorption energy distribution on the residual sediment organic matter (SOM) became more heterogeneous. In addition, increasing sorption capacity for the residual fractions, except for BLF with its high polarity, suggested that more sorption sites on the SOM matrix became accessible to Phen. The sorption capacity for LGF was comparable to that of condensed SOM. The residual fraction LGF generally controlled the overall sorption at low Phen concentration, but the extractable fraction FL surpassed the former fraction at high Phen concentration, demonstrating the importance of condensed SOM in the sorption of hydrophobic organic compounds (HOCs) in sediments.

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“…The Ordinary Kriging interpolation method was used to characterize the spatial distribution of LABs in soils for assessing sewage contamination, which was carried out with ArcGIS 9.3 (ESRI, Redlands, California, USA) (Juang and Lee, 1998;Carlon et al, 2001;Hu et al, 2006Hu et al, , 2009.…”

Section: Discussionmentioning

confidence: 99%

Utility of soil linear alkylbenzenes to assess regional anthropogenic influences with special reference to atmospheric transport

Wei

Bao

Guo

et al. 2014

Science of The Total Environment

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Fatty acid composition of surface sediments in the subtropical Pearl River estuary and adjacent shelf, Southern China

Cited by 82 publications

References 41 publications

River organic matter shapes microbial communities in the sediment of the Rhône prodelta

River organic matter shapes microbial communities in the sediment of the Rhône prodelta

Role of extractable and residual organic matter fractions on sorption of phenanthrene in sediments

Utility of soil linear alkylbenzenes to assess regional anthropogenic influences with special reference to atmospheric transport

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