Schukat, Anna; Massing, Jana Chiara; Dorschner, Sabrina; Hagen, Wilhelm; Auel, Holger (2022): Fatty acid composition of zooplankton, fishes and sea birds from the northern Humboldt Current System during Maria S. Merian cruise MSM80 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.949562, In: Schukat, Anna; Massing, Jana Chiara; Auch, Dominik; Dorschner, Sabrina; Welker, Annelie; Hagen, Wilhelm; Auel, Holger (2022): Fatty acid and stable isotope composition of zooplankton, fishes and sea birds from the northern Humboldt Current System during Maria S. Merian cruise MSM80 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.949801
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Abstract:
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.
Project(s):
Coverage:
Median Latitude: -11.726054 * Median Longitude: -78.036892 * South-bound Latitude: -16.015167 * West-bound Longitude: -80.987767 * North-bound Latitude: -8.499733 * East-bound Longitude: -74.159183
Date/Time Start: 2018-12-27T23:39:00 * Date/Time End: 2019-01-24T21:09:00
Minimum Elevation: -6303.2 m * Maximum Elevation: -79.0 m
Event(s):
MSM80_1-6 * Latitude: -8.507850 * Longitude: -80.987767 * Date/Time: 2018-12-27T23:39:00 * Elevation: -6303.2 m * Campaign: MSM80 (CUSCO-1) * Basis: Maria S. Merian * Method/Device: Multiple opening/closing net (MSN)
MSM80_1-9 * Latitude: -8.523817 * Longitude: -80.939017 * Date/Time: 2018-12-28T02:38:00 * Elevation: -5820.2 m * Campaign: MSM80 (CUSCO-1) * Basis: Maria S. Merian * Method/Device: Isaac-Kid-Midwater Trawl (IKMT)
MSM80_4-6 * Latitude: -8.517300 * Longitude: -80.491733 * Date/Time: 2018-12-28T15:41:00 * Elevation: -1342.3 m * Campaign: MSM80 (CUSCO-1) * Basis: Maria S. Merian * Method/Device: Multiple opening/closing net (MSN)
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
4235 data points
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