Lipid biomarkers and organic matter carbon isotopes in estuarine sediments as proxies for evaluating seawater intrusion

Gong, Weiming; Zhang, Zhaohui

doi:10.1016/j.ecss.2015.01.016

Cited by 19 publications

(8 citation statements)

References 36 publications

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“…Dried leave samples were ground and homogenized, and then directly analyzed. Bulk organic matter δ 13 C and δ 15 N were measured on a Thermo elementary analyzer-ConFlo IV-Delta V Advantage mass spectrometer in Ocean College, Zhejiang University, following a protocol described in Gong and Zhang (2015). All δ 13 C and δ 15 N results were reported to V-PDB and air-N 2 , respectively.…”

Section: Carbon and Nitrogen Isotope Analysesmentioning

confidence: 99%

Environmental Factors Causing Stress in Avicennia marina Mangrove in Rabigh Lagoon Along the Red Sea: Based on a Multi-Approach Study

2021

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Lagoons along the Red Sea are socio-economically important but most vulnerable ecosystems. Strong evaporation, strengthened due to global warming, leads to high salinity and high temperature in surface water, which exacerbate physiological stress in mangroves. Rabigh Lagoon is characterized by unusually large spatial differences in nutrient dynamics and physicochemical parameters. We conducted a multi-approach study to demonstrate how environmental factors cause growth retardation and stress in mangroves. There were significant variations (P < 0.05) in water salinities and temperatures, nitrogen and phosphorus abundance in sediments, and antioxidants in mangroves among 8 sites across the lagoon. Salinity and water temperature rapidly increased from the northern where Red Sea seawater enters to the southern end, but dissolved oxygen declined. High salinity (44.9), high surface water temperature (28.8°C) and relatively high nutrients at the southern end of the lagoon (S8) corresponded to high concentrations of antioxidants. High δ13C (−12.4‰) and δ15N (4.9‰) in the sediments at S8 also reveal relatively high nutrient level due to stagnant water, camel grazing, and runoff bringing in fertilizer from agriculture activities in the catchments during seasonal flooding events. Principal component analyses showed that N and P limitation at the lagoon entrance is the leading cause for mangrove stress, while high salinity, temperature, and low dissolved oxygen are the predominant factors for high antioxidants concentrations at the southern end of the lagoon.

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Section: Carbon and Nitrogen Isotope Analysesmentioning

confidence: 99%

Environmental Factors Causing Stress in Avicennia marina Mangrove in Rabigh Lagoon Along the Red Sea: Based on a Multi-Approach Study

2021

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“…In the furnace, water was reduced rapidly and sufficiently to H 2 and CO, which were separated when passing through a chromatogram column. H 2 and CO were then measured by Thermo MAT253 isotope ratio mass spectrometer for δD and δ 18 O, respectively (Gong & Zhang, ; Zhang & Sachs, ). All results are reported to V‐SMOW.…”

Section: Methodsmentioning

confidence: 99%

Rapid Shifts in Chemical and Isotopic Compositions of Sediment Pore Waters in the Amami Sankaku Basin in Response to Initial Arc Rifting in the Mid‐Oligocene

Zhao-hui

2020

Geochem Geophys Geosyst

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Pore waters were recovered from the sediment cores drilled in the back‐arc Amami Sankaku Basin (ASB) during the International Ocean Discovery Program Expedition 351. The sediment sequence is composed of the recent mud and ooze from late Oligocene/early Miocene accumulated at 7 m/Ma and rapid deposition of thick volcaniclastic sequence at 50 m/Ma. Such variations are reflected in the evolutions of chemical and isotopic compositions of pore waters. Cl and Ca concentrations in pore waters increased rapidly with depth and became enriched in the deep portion. Before arc rifting, extremely high deposition rates of volcaniclastic gravity‐flow sediments from the nearby Kyushu‐Palau arc into the ASB resulted in strong alteration, removing Mg and Si from pore waters. Mg concentrations were initially almost zero but abruptly shifted to substantial increases after ~29.5 Ma, indicating extended rifting of the active volcanic axis from the ASB. The δ18O and δD values of pore waters also evolved from more depleted and wide range to more positive and narrow range as a response to reduced alteration and increasing influence of seawater. Concentrations of Si and Mn in pore waters rapidly increased since ~29.5 Ma but suddenly declined at ~17.5 Ma due to the cessation of input of volcaniclastic materials. Covariations of Ca and Mg in pore waters are very similar to those in the back‐arc West Philippine Basin but significantly different from those in the Izu‐Bonin fore‐arc basin. Variations in chemical and isotopic compositions of pore waters can assist the reconstruction of tectonic activities.

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“…Mimo przeobrażeń jakim podlega materia organiczna, mogą przetrwać w osadach dennych nawet setki tysięcy lat [6,28]. Dlatego też, wykorzystywane są w badaniach paleoekologicznych i paleośro-dowiskowych, gdzie ustala się źródła i transport biomarkerów lipidowych na obszarze zlewni oraz wpływ działalności człowieka na środowisko wodne na przestrzeni lat.…”

Section: Biomarkery Lipidoweunclassified

“…O pochodzeniu lądowym materii organicznej świadczą n-alkany oraz n-alkanole długołańcu-chowe n-C24 i n-C26. N-alkany krótkołańcuchowe wskazują na obecność glonów, a średniołańcuchowe o występowaniu makrofitów [6,9]. Sterole należą do lipidów błonowych, które występują w organizmach eukariotycznych (tj.…”

Section: Biomarkery Lipidoweunclassified

“…Rośliny lądo-we, nazywane inaczej C3, mogą wiązać CO2 bezpośrednio z atmosfery, wykorzystując fotosyntetyczną ścieżkę Calvina-Bensona. Z kolei inne rośliny, zaliczane do C4, wiążą CO2, używając ścieżki Hatcha-Slacka [6,7]. Materia organiczna produkowana przez roślinność lądową i glony słodkowodne z CO2 atmosferycznego i rozpuszczonego (δ 13 C ~ -8‰) w rezultacie posiada niższe wartości δ 13 C, gdzie dla roślin C3 wartość δ 13 C wynosi ~ -38‰ --22‰ [7,21,25].…”

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Wskaźniki Pochodzenia I Kierunków Przemian Materii Organicznej W Osadach Dennych Zbiorników Wodnych

Piwińska¹,

Gruca–Rokosz²

2017

ZNPRzBiS

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Lipid biomarkers and organic matter carbon isotopes in estuarine sediments as proxies for evaluating seawater intrusion

Cited by 19 publications

References 36 publications

Environmental Factors Causing Stress in Avicennia marina Mangrove in Rabigh Lagoon Along the Red Sea: Based on a Multi-Approach Study

Environmental Factors Causing Stress in Avicennia marina Mangrove in Rabigh Lagoon Along the Red Sea: Based on a Multi-Approach Study

Rapid Shifts in Chemical and Isotopic Compositions of Sediment Pore Waters in the Amami Sankaku Basin in Response to Initial Arc Rifting in the Mid‐Oligocene

Wskaźniki Pochodzenia I Kierunków Przemian Materii Organicznej W Osadach Dennych Zbiorników Wodnych

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