Kremer, Kira Izabela; Sell, Anne F: Trophic ecology of squids in the Benguela Upwelling System assessed through stomach content, fatty acid and stable isotopes analyses in austral spring 2021 - Stable isotope measurements of squids [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.974072 (dataset in review)
Abstract:
Squids were collected during the research cruise SO285 on RV Sonne in the northern (nBUS) and southern (sBUS) Benguela Upwelling System between September 13 and October 9, 2021 in order to determine their trophic position and nutritional ecology. The cruise was part of the TRAFFIC (Trophic tRAnsfer eFFICiency in the Benguela Current) project. Samples were retrieved from 117 rectangular midwater trawl (RMT) net hauls at 11 stations in the nBUS (sampling range 88–600 m) and 17 RMT net hauls at 14 stations in the sBUS (sampling range 80–750 m). Furthermore, hooks and lines were used at 10 stations in the nBUS (ranging from 15 to 160 min per station, 2–6 rods) and 13 stations in the sBUS (ranging from 20 to 105 min per station, 1–6 rods) in the upper two meters of the water column. Dorsal mantle length (DML) of each specimen was measured to the nearest mm below. Mantle muscle tissue sample was taken from 82 squid specimens for stable isotope analyses (SIA). SIA revealed significant differences in δ15N values of small squids (dorsal mantle length <10 cm) between the two subsystems, but none in those of large squids (dorsal mantle length >10 cm). Trophic position estimates based on Post (2002) ranged from 2.2 to 5.0. Isotopic niche width was widest in the families Ommastrephidae and Cranchiidae.
Keyword(s):
Supplement to:
Kremer, Kira Izabela; Hagen, Wilhelm; Oesterwind, Daniel; Duncan, Sabrina; Bode-Dalby, Maya; Dorschner, Sabrina; Dudeck, Tim; Sell, Anne F (2025): Trophic ecology of squids in the Benguela Upwelling System elucidated by combining stomach content, stable isotope and fatty acid analyses. Marine Biology, 172(2), 32, https://doi.org/10.1007/s00227-024-04592-2
Related to:
Kremer, Kira Izabela; Hagen, Wilhelm; Bode-Dalby, Maya; Sell, Anne F: Trophic ecology of squids in the Benguela Upwelling System assessed through stomach content, fatty acid and stable isotopes analyses in austral spring 2021 - Stable isotope baseline measurements [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.974073
Kremer, Kira Izabela; Hagen, Wilhelm; Dorschner, Sabrina; Sell, Anne F: Trophic ecology of squids in the Benguela Upwelling System assessed through stomach content, fatty acid and stable isotopes analyses in austral spring 2021 - Fatty acid contents of squids [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.974064
Kremer, Kira Izabela; Oesterwind, Daniel; Sell, Anne F: Trophic ecology of squids in the Benguela Upwelling System assessed through stomach content, fatty acid and stable isotopes analyses in austral spring 2021 - Stomach contents of squids [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.974071
References:
Post, David M (2002): Using stable isotopes to estimate trophic position: Models, methods, and assumptions. Ecology, 83(3), 703-718, https://doi.org/10.2307/3071875
Project(s):
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. SPACES II 03F0797A: Trophic Transfer Efficiency in the Benguela Current
Federal Ministry of Education and Research (BMBF), grant/award no. SPACES II 03F0797B: Trophic Transfer Efficiency in the Benguela Current
Federal Ministry of Education and Research (BMBF), grant/award no. SPACES II 03F0797D: Trophic Transfer Efficiency in the Benguela Current
Coverage:
Median Latitude: -25.806700 * Median Longitude: 13.207931 * South-bound Latitude: -31.992820 * West-bound Longitude: 11.098080 * North-bound Latitude: -20.049370 * East-bound Longitude: 15.849520
Date/Time Start: 2021-09-13T18:27:09 * Date/Time End: 2021-10-09T21:47:07
Minimum Elevation: -3878.6 m * Maximum Elevation: -314.4 m
Event(s):
SO285_17-1_1 * Latitude: -29.199920 * Longitude: 12.000150 * Date/Time: 2021-09-13T18:27:09 * Elevation: -3878.6 m * Location: South Atlantic Ocean * Campaign: SO285 (TRAFFIC) * Basis: Sonne_2 * Method/Device: Hook and line * Comment: Fishing during CTD cast for 20 to 105 min using 1-6 fishing rods; event was not logged in DSHIP
SO285_17-7 * Latitude Start: -29.262070 * Longitude Start: 12.003620 * Latitude End: -29.329870 * Longitude End: 12.007550 * Date/Time Start: 2021-09-13T22:07:46 * Date/Time End: 2021-09-14T00:21:02 * Elevation Start: -3873.2 m * Elevation End: -3877.8 m * Location: South Atlantic Ocean * Campaign: SO285 (TRAFFIC) * Basis: Sonne_2 * Method/Device: Rectangular midwater trawl 4500 µm (RMT8) * Comment: in the cruise report, the mesh size was erroneously reported as 4000 µm
SO285_19-1 * Latitude Start: -31.002200 * Longitude Start: 15.431880 * Latitude End: -31.100280 * Longitude End: 15.430650 * Date/Time Start: 2021-09-15T00:50:20 * Date/Time End: 2021-09-15T03:39:19 * Elevation Start: -873.3 m * Elevation End: -992.8 m * Location: South Atlantic Ocean * Campaign: SO285 (TRAFFIC) * Basis: Sonne_2 * Method/Device: Rectangular midwater trawl 4500 µm (RMT8) * Comment: in the cruise report, the mesh size was erroneously reported as 4000 µm
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Kremer, Kira Izabela | |||
| 2 | Date/Time of event | Date/Time | Kremer, Kira Izabela | |||
| 3 | Date/Time of event 2 | Date/Time 2 | Kremer, Kira Izabela | |||
| 4 | Latitude of event | Latitude | Kremer, Kira Izabela | |||
| 5 | Longitude of event | Longitude | Kremer, Kira Izabela | |||
| 6 | Latitude of event 2 | Latitude 2 | Kremer, Kira Izabela | |||
| 7 | Longitude of event 2 | Longitude 2 | Kremer, Kira Izabela | |||
| 8 | Location of event | Location | Kremer, Kira Izabela | |||
| 9 | Location | Location | Kremer, Kira Izabela | |||
| 10 | Elevation of event | Elevation | m | Kremer, Kira Izabela | ||
| 11 | Elevation of event 2 | Elevation 2 | m | Kremer, Kira Izabela | ||
| 12 | Depth, water, top/minimum | Depth water top | m | Kremer, Kira Izabela | ||
| 13 | Depth, water, bottom/maximum | Depth water bot | m | Kremer, Kira Izabela | ||
| 14 | Method/Device of event | Method/Device | Kremer, Kira Izabela | |||
| 15 | Gear | Gear | Kremer, Kira Izabela | |||
| 16 | Sample ID | Sample ID | Kremer, Kira Izabela | |||
| 17 | Family | Family | Kremer, Kira Izabela | |||
| 18 | Identification | ID | Kremer, Kira Izabela | Taxon as identified | ||
| 19 | Species, unique identification | Species UID | Kremer, Kira Izabela | Reference in WoRMS (WoRMS) | ||
| 20 | Species, unique identification (URI) | Species UID (URI) | Kremer, Kira Izabela | Reference in WoRMS (WoRMS) | ||
| 21 | Species, unique identification (Semantic URI) | Species UID (Semantic URI) | Kremer, Kira Izabela | Reference in WoRMS (WoRMS) | ||
| 22 | Cephalopoda, mantle length | Cephalopoda ML | mm | Kremer, Kira Izabela | Measured | Dorsal mantle length (DML); measured to the nearest mm below |
| 23 | δ13C | δ13C | ‰ | Kremer, Kira Izabela | Mass spectrometer (MSPEC) | Mass spectrometry at the Agroisolab GmbH, Jülich, Germany |
| 24 | δ15N | δ15N | ‰ | Kremer, Kira Izabela | Mass spectrometer (MSPEC) | Mass spectrometry at the Agroisolab GmbH, Jülich, Germany |
| 25 | Carbon, total | TC | % | Kremer, Kira Izabela | Mass spectrometer (MSPEC) | Mass spectrometry at the Agroisolab GmbH, Jülich, Germany |
| 26 | Nitrogen, total | TN | % | Kremer, Kira Izabela | Mass spectrometer (MSPEC) | Mass spectrometry at the Agroisolab GmbH, Jülich, Germany |
| 27 | Carbon/Nitrogen ratio | C/N | Kremer, Kira Izabela | Mass spectrometer (MSPEC) | Mass spectrometry at the Agroisolab GmbH, Jülich, Germany | |
| 28 | Trophic level | Trophic level | Kremer, Kira Izabela | Calculated according to Post (2022) | Trophic position |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1224 data points