Dataset Information

Molecular distribution and isotopic composition (δD and δ¹³C) of lipids dataset for a sediment core (GeoB16202-2) from the north-eastern Brazilian margin.

ABSTRACT: The distribution and isotopic composition (δ¹³C and δD) of lipids are proxies used to determinate paleoenvironmental conditions including precipitation regimes, vegetation changes and sources of organic matter, among others. This data article describes five datasets of distribution (n-alkanes, fatty acids, n-alkanols and sterols) and isotopic composition (n-alkanes and fatty acids) of lipids determined in 50 samples from a gravity core (GeoB16202-2) retrieved on the continental slope off northeastern Brazil. The core site is influenced by the Parnaiba freshwater discharge, the North Brazil Current and by the Intertropical Convergence Zone (ITCZ). Previous work focused on inorganic proxies in this core revealed important clues of climatic conditions during the Heinrich Stadial 1 (HS1). The baseline dataset of molecular and isotopic proxies of the organic matter provided here are additional and/or complimentary evidences to help elucidate past climate change during the Quaternary in the Equatorial Atlantic, where less information is available in comparison to other regions in this ocean.

SUBMITTER: Rozo L

PROVIDER: S-EPMC7689042 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Molecular distribution and isotopic composition (δD and δ13C) of lipids dataset for a sediment core (GeoB16202-2) from the north-eastern Brazilian margin.

Rozo Laura L Lazzari Leticia L Schefuß Enno E Mulitza Stefan S Carreira Renato R

Data in brief 20201106

The distribution and isotopic composition (δ13C and δD) of lipids are proxies used to determinate paleoenvironmental conditions including precipitation regimes, vegetation changes and sources of organic matter, among others. This data article describes five datasets of distribution (n-alkanes, fatty acids, n-alkanols and sterols) and isotopic composition (n-alkanes and fatty acids) of lipids determined in 50 samples from a gravity core (GeoB16202-2) retrieved on t ...[more]

PMID: 33294508

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Project description:RationaleThe use of sulfur isotopes to study trophic ecology in marine ecosystems has increased in the past decade. Unlike other commonly used isotopes (e.g., carbon), sulfur can better discriminate benthic and pelagic productivity. However, how lipid extraction affects sulfur isotopic values has not been assessed, despite its frequent use to remove lipid effects on δ13 C values.MethodsWe used white muscle and liver samples from two species of sharks and skin samples from two species of pinnipeds (sea lion and fur seal) to assess the effects of lipid extraction on stable isotope values for δ34 S, δ13 C, and δ15 N. Isotopic values were determined using a continuous flow-isotope ratio mass spectrometer coupled to an elemental analyzer.ResultsLipid extraction significantly decreased δ34 S values in shark tissues, more so for liver than muscle (-4.6 ± 0.9‰ vs -0.8 ± 0.3‰, average change), with nearly no change in their standard deviations. Lipid extraction did not affect δ34 S values from pinniped skin samples (0.2 ± 0.8‰, average change). After lipid extraction, consistent increases in δ13 C values (0.2‰-7.3‰) were detected as expected, especially in tissue with high lipid content (C:N >4). After lipid extraction, significant increases in δ15 N values (0.5‰-1.4‰) were found in shark muscle and liver tissues. For pinniped skin samples, δ15 N values were not significantly lower after lipid extraction (-0.4‰ to -0.1‰).ConclusionsLipid extraction did not have a strong impact on δ34 S values of shark muscle and pinniped skin (≤1‰). However, our results suggest it is essential to consider the effects of lipid extraction when interpreting results from δ34 S values of shark liver tissue, as they significantly depleted values relative to bulk tissue (~5‰). This may reflect selective removal of sulfolipids and glutathione present in higher concentrations in the liver than in muscle and skin and requires further investigation.

Dataset Information

Molecular distribution and isotopic composition (δD and δ¹³C) of lipids dataset for a sediment core (GeoB16202-2) from the north-eastern Brazilian margin.

Publications

Molecular distribution and isotopic composition (δD and δ<sup>13</sup>C) of lipids dataset for a sediment core (GeoB16202-2) from the north-eastern Brazilian margin.

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