Stable carbon and nitrogen isotopic signatures of organic matter sources in near-shore areas of Lake Victoria, East Africa

Elemental (total organic carbon (TOC) and total nitrogen (TN)) and stable carbon and nitrogen isotope compositions (δ13C and δ15N, respectively) in the surface sediment of Zhanjiang Bay (ZJB) in spring and summer were measured to study the spatial and seasonal changes of organic matter (OM) and assess the human-induced and environment-induced changes in the area. The OM in the surface sediment of ZJB was a mixture of terrestrial and marine sources, and was dominated by marine OM (54.9% ± 15.2%). Compared to the central ZJB, the channel and coastal ZJB areas had higher δ13C and δ15N values, higher TOC and TN concentrations, and lower TOC/TN ratios, indicating higher primary productivity and higher percentages of marine OM in the latter two subregions. Mariculture activities, sewage inputs, and dredging were responsible for these phenomena. Clear seasonal variations in OM were observed in ZJB. The average proportions of terrestrial OM in summer increased by 10.2% in the ZJB channel and 26.0% in the coastal ZJB area compared with those in spring. Heavy rainfall brought a large amount of terrestrial OM into the channel and coastal ZJB areas, leading to the increase of the terrestrial OM fraction in these two subregions in summer. In summary, anthropogenic influences had a significant influence on the spatial and seasonal variations of sedimentary OM in ZJB.

Download Full-text

C:N:P ratios and stable carbon isotope compositions as indicators of organic matter sources in a riverine wetland system (Moji-guaçu River, São Paulo-Brazil)

Wetlands ◽

10.1007/bf03160713 ◽

1997 ◽

Vol 17 (1) ◽

pp. 1-9 ◽

Cited By ~ 16

Author(s):

Ana Luiza S. Albuquerque ◽

Antonio A. Mozeto

Keyword(s):

Organic Matter ◽

Carbon Isotope ◽

Stable Carbon Isotope ◽

Sao Paulo ◽

São Paulo ◽

Stable Carbon ◽

Organic Matter Sources ◽

Wetland System ◽

Riverine Wetland

Download Full-text

Effects of ethanol-preservation on stable carbon and nitrogen isotopic signatures in marine predators

Plankton and Benthos Research ◽

10.3800/pbr.10.91 ◽

2015 ◽

Vol 10 (2) ◽

pp. 91-97 ◽

Cited By ~ 3

Author(s):

Sachiko Horii ◽

Kazutaka Takahashi ◽

Ken Furuya

Keyword(s):

Stable Carbon ◽

Isotopic Signatures ◽

Carbon And Nitrogen ◽

Marine Predators

Download Full-text

Stable Carbon and Nitrogen Isotopes in the Tidal Flat Sediments of Northern Yellow Sea

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.316-317.223 ◽

2013 ◽

Vol 316-317 ◽

pp. 223-226

Author(s):

Bao Zhan Liu ◽

Yu Liu ◽

Ying Li ◽

Hai Xia Wang

Keyword(s):

Organic Matter ◽

Tidal Flat ◽

Yellow Sea ◽

Nitrogen Isotopes ◽

Stable Carbon ◽

Terrestrial Organic Matter ◽

Δ13c And Δ15n ◽

Carbon And Nitrogen Isotopes ◽

Carbon And Nitrogen ◽

Northern Yellow Sea

Stable carbon and nitrogen compositions (δ13C, δ15N) of sedimentary organic matter were determined in the tidal flat of northern Yellow sea. The results showed that stable carbon and nitrogen isotopes compositions of the sediment samples ranged from −24.669～−19.457‰ and 2.125～7.043‰, respectively. The highest value was in St.DLD, and the lowest was in St.Z. Similar δ13C values were observed in St.H (−21.996±0.651‰) and St.P (−22.021±0.187‰), and similar δ15N values were between St.DLJ (5.502±0.223‰) and St.P (5.310±0.294‰). The δ13C and δ15N values did not show any significant regularity. The δ13C and δ15N signatures showed some fluctuation, no obvious regularity. The major source of terrestrial organic matter was from the emissions of river and human pollutant.

Download Full-text