The sedimentary organic matter from a Lake Ichkeul core (far northern Tunisia): Rock-Eval and biomarker approach

Affouri, Hassène; Sahraoui, Olfa

doi:10.1016/j.jafrearsci.2017.01.017

Cited by 14 publications

(8 citation statements)

References 35 publications

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“…Other issues which impacted the water level in the lake were the deposit of fine sediment on the Northeast sector and the locks installed in the Tinja channel. During this year, the lack of freshwater inputs from precipitation and from the rivers coupled with high evaporation rates has dropped the lake water levels to acute depths (Affouri and Sahraoui 2017).…”

Section: Discussionmentioning

confidence: 99%

“…The water budget in the Ichkeul Lake is controlled by contributions from both marine waters from the Bizerte Lagoon and freshwater from direct rainfall and from its watersheds. During the rainy seasons, a large volume of the lake water spills off to the Bizerte lagoon through the Tinja channel (Affouri and Sahraoui 2017). In summer, high evaporation rates lower the water level and allow seawater to enter to the lake.…”

Section: Study Area and Main Featuresmentioning

confidence: 99%

“…In summer, high evaporation rates lower the water level and allow seawater to enter to the lake. The wetland is, therefore, characterized by a double seasonal alternation of high-water levels (2.0 m<) and low salinity (< 8.0) in the wet season from October to March due to freshwater from run-off, while it shows a low water levels (<1 m) and a high salinity (50 g/l <) in the dry season from April to September due to the inflow of sea water (Tamisier et al 2001, Shaiek 2016, Affouri and Sahraoui 2017.…”

Section: Study Area and Main Featuresmentioning

confidence: 99%

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Hydrology, Biogeochemistry and Metabolism in a Semi-Arid Mediterranean Coastal Wetland Ecosystem

Béjaoui

Salem

Basti

et al. 2022

Preprint

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Experimental and numerical approaches were used to assess the functioning of a flagship coastal wetland ecosystem for improved water management. Very pronounced seasonal contrast in Salinity and Chlorophyll a were found, with high correlation between Chla and Phosphorus during winter and Chla and Nitrogen during summer. Water and Dissolved Inorganic Phosphorus (DIP) and Dissolved Inorganic Nitrogen (DIN) fluxes exhibited seasonal variation, where the lake is a source of DIN and DIP during the wet season. A considerable anthropogenic-driven amount of nitrogen is transferred into N2/N2O to the atmosphere during the dry season with predominance of denitrification-anammox processes. The primary production is impacted by forcing the respiration of the ecosystem to reduce the Net Ecosystem Metabolism so that the system is functioning as heterotrophic. Climate change and anthropogenic pressures explain the deterioration of water quality and possibly the decrease in populations of Palearctic birds, warranting depollution and effective National Wetland Management Strategies through improved water resources management.

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Section: Discussionmentioning

confidence: 99%

Section: Study Area and Main Featuresmentioning

confidence: 99%

Section: Study Area and Main Featuresmentioning

confidence: 99%

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Hydrology, Biogeochemistry and Metabolism in a Semi-Arid Mediterranean Coastal Wetland Ecosystem

Béjaoui

Salem

Basti

et al. 2022

Preprint

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“…In this study, the discrimination capacities of the commonly used source tracking tools during biodegradation were evaluated and compared using artificial sediments with different mixing ratios of two contrasting OM sources. Two modes were observed: (i) conservative All of these tools were widely utilized to track and estimate OM sources in various aquatic environments, including rivers, groundwater, lakes, coastal area and oceans (Affouri and Sahraoui, 2017;Derrien et al, 2018;Li et al, 2015;Ogrinc et al, 2005;Osburn et al, 2016a;Toming et al, 2013;Zhang et al, 2017). They were used with the assumption of a conservative mixing behavior and stability under diagenetic processes without firstly evaluating the potential limited applicability.…”

Section: Implications For the Applicability Of The Organic Matter Soumentioning

confidence: 99%

Do early diagenetic processes affect the applicability of commonly-used organic matter source tracking tools? An assessment through controlled degradation end-member mixing experiments

et al. 2020

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“…They were also observed in oxygenated environments and were interpreted as a direct microbiota inputs generated by E -decarboxylation of bacterial odd fatty acids (Grimalt and Albaigés, 1987;Nishimura and Baker, 1986). The predominance of C 18 in lacustrine sediments was considered to be inherited from planktonic and/or bacterial cells (Affouri and Sahraoui, 2017). A short chain mode of even alkanes was observed in C3 trees and C4 grasses, woodland and grassland soils ( Table 2).…”

Section: Petroleum Contaminationmentioning

confidence: 99%

Aliphatic hydrocarbons and triterpenes of the Congo deep-sea fan

Méjanelle

Rivière

Pinturier

et al. 2017

Deep Sea Research Part II: Topical Studies in Oceanography

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Hydrocarbons were analyzed in sediments from the Congo River deep-sea fan, from the Congo River, and in sinking particles collected by sediment traps 40 m above the sediment. Studied sites encompassed three lobes of decreasing age of formation along the canyon: sites A, F and C and a another lobe system, disconnected from the active channel since 4 ka, Site E. Terrestrial long-chain odd n-alkanes were dominant in all sediments of the lobe system. Unsaturated terpenoids sourced by higher plants, such as gammacerene, lupene, ursene and oleanene, were also detected. At site C, characterized by high accumulation rates (10-20 cm yr−1), the organic matter spends less time in the oxic layer than at other sites and high phytadiene concentrations (10 to 17 μg gOC−1) evidenced recent terrestrial and phytoplanktonic remains reworked in anaerobic conditions. In these sediments, organic carbon-normalized concentrations of terrestrial alkanes and terpenoids were several fold higher than in the lobe sediments with lower accumulation rates (sites A and F), arguing for a more rapid degradation of terrestrial hydrocarbons than bulk organic carbon in the first steps of pre-diagenesis. Ample variations in the contributions of biomarkers from higher plants, ferns, bacteria and angiosperms, indicate an heterogeneous contribution of the soil and vegetation detritus delivered to the Congo lobe sediments. Lower concentrations in terrestrial hydrocarbons at site E, 45 km away from the active canyon, indicated that river particles are still admixed to the dominant marine organic matter. Diploptene and hop-7(21)ene have a dual origin, from terrestrial and marine microorganisms. Scatter in their relationship to gammacerene argues for a contribution of marine microorganisms, in addition to soils-sourced microorganisms. The close distribution patterns of diploptene, hop-21-ene, hop-7(21)ene and neohop-13(18)-ene is in line with the hypothesis of sequential clay-catalyzed isomerisation of bacterial hopenes. Terrestrial biomarker accumulation fluxes at site C are one order of magnitude higher than vertical pelagic flux, demonstrating the magnitude of the inputs delivered through turbiditic transport in the submarine canyon. Crude oil contamination was evidenced at the disconnected site E (UCM, C21 to Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site. C26 tricyclic diterpanes, CPI) and, in smaller amounts, in some sediments from sites A and C. It may be related to marine crude oil extraction and transport. A short-chain mode of alkanes with an even predominance is evidenced in sediments of the lobe complex and likely sources, crude oil, microorganisms and ferns, are discussed.

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The sedimentary organic matter from a Lake Ichkeul core (far northern Tunisia): Rock-Eval and biomarker approach

Cited by 14 publications

References 35 publications

Hydrology, Biogeochemistry and Metabolism in a Semi-Arid Mediterranean Coastal Wetland Ecosystem

Hydrology, Biogeochemistry and Metabolism in a Semi-Arid Mediterranean Coastal Wetland Ecosystem

Do early diagenetic processes affect the applicability of commonly-used organic matter source tracking tools? An assessment through controlled degradation end-member mixing experiments

Aliphatic hydrocarbons and triterpenes of the Congo deep-sea fan

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