Publication Date:
2024-07-19
Description:
Fatty acids were analyzed by gas chromatography using a DB-FFAP column of 30 m length and 0.25 mm inner diameter and a programmable temperature vaporizer injector. Following the trophic biomarker concept, the fatty acids 16:0, 20:5(n-3) and 22:6(n-3) were classified as typical components of biomembranes. High levels of 16:1(n−7) as well as 16:4(n−1) and 18:1(n−7) were used as diatom markers and 18:4(n−3) as fatty acid marker for dinoflagellates. The fatty acid 18:1(n-9) indicates carnivorous feeding. A carnivory index was applied based on the fatty acid ratio 18:1(n−9) / [16:1(n−7) + 16:4(n−1) + 18:1(n−7) + 18:4(n−3) + 18:1(n−9)] to reflect the proportion of carnivorous compared to herbivorous feeding in an organism. Fatty acid compositions of zooplankton and fish were taxon-specific and did not depend on sampling area or depth. Most species showed a dominance of typical membrane fatty acids, e.g., 16:0, 20:5(n-3) and 22:6(n-3). The dominant copepod Calanus chilensis had a low carnivory index and elevated amounts of diatom fatty acid markers which point to a predominantly herbivorous feeding. Among the krill species, Euphausia mucronata had the lowest carnivory index compared to the other euphausiids indicating a more herbivorous feeding. The squat lobster Pleuroncodes monodon had a significantly lower carnivory ratio compared to the deep-sea decapods Gennadas sp. and Acanthephyra sp. emphasizing its different trophic role compared to other decapods.
Keywords:
6,9,12,15-Hexadecatetraenoic acid of total fatty acids; ACS; all-cis-4,7,10,13,16,19-Docosahexaenoic acid of total fatty acids; all-cis-5,8,11,14,17-Eicosapentaenoic acid of total fatty acids; all-cis-5,8,11,14-Eicosatetraenoic acid of total fatty acids; all-cis-8,11,14-Octadecatrienoic acid of total fatty acids; all-cis-9,12-Octadecadienoic acid of total fatty acids; cis-11-Docosenoic acid of total fatty acids; cis-11-Icosenoic acid of total fatty acids; cis-11-Octadecenoic acid of total fatty acids (IUPAC: Octadec-11-enoic acid); cis-11-Octadecenol of total fatty alcohols; cis-15-Tetracosenoic acid of total fatty acids; cis-9-Hexadecenoic acid of total fatty acids (IUPAC: (9Z)-hexadec-9-enoic acid); cis-9-Hexadecenol of total fatty alcohols; cis-9-Octadecenoic acid of total fatty acids (IUPAC: Octadec-9-enoic acid); cis-9-Octadecenol of total fatty alcohols; Coastal Upwelling System in a Changing Ocean; CUSCO; CUSCO-1; Date/Time of event; Depth, bottom/max; Depth, top/min; Docosenol of total fatty alcohols; Eicosenol of total fatty alcohols; Event label; Gas chromatography; Hexadecanoic acid of total fatty acids; Hexadecanol of total fatty alcohols; IKMT; Individual dry mass; Isaac-Kid-Midwater Trawl; Latitude of event; Life stage; Lipids; Longitude of event; Maria S. Merian; Microstructure Profiler; MSM80; MSM80_102-4; MSM80_13-4; MSM80_15-5; MSM80_1-6; MSM80_16-4; MSM80_18-4; MSM80_18-7; MSM80_1-9; MSM80_20-4; MSM80_30-4; MSM80_31-4; MSM80_31-7; MSM80_34-4; MSM80_40-5; MSM80_4-6; MSM80_46-15; MSM80_46-20; MSM80_46-23; MSM80_49-6; MSM80_56-5; MSM80_58-4; MSM80_67-4; MSM80_68-5; MSM80_68-6; MSM80_7-4; MSM80_74-4; MSM80_7-8; MSM80_85-3; MSM80_94-5; MSM80_95-4; MSN; MSSP; Multiple opening/closing net; Octadecanoic acid of total fatty acids; Octadecanol of total fatty alcohols; Optical Profiler, ACS; Order; Phytanic acid of total fatty acids; Sample ID; Species; Station label; Tetradecanoic acid of total fatty acids; Tetradecanol of total alcohols; Wax esters
Type:
dataset
Format:
text/tab-separated-values, 4235 data points
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