Carbon and nitrogen stable isotope values for pelagic and benthic invertebrate fauna from the Nansen and Amundsen Basins from the Nansen Legacy JC2-2 cruise (2021).

Study Extent

Nansen and Amundsen Basin

Sampling

Zooplankton samples were collected from WP2 net hauls. Benthic fauna were sampled from surface sediments of box cores which was sieved over 0.25 mm mesh. Due to low densities, fauna were pooled by taxon from replicate box cores per site, frozen onboard at -20 degC and later freeze-dried. Details in Kohlbach et al. (in revision with Elementa) and also refer to Nansen Legacy protocol v.10.

Method steps

1. Dried faunal samples were analyzed at the Alaska Stable Isotope Lab on a Thermo Scientific Conflow IV and Delta VPlus ratio mass spectrometer. For all samples d15N values are from non-acidified samples, while d13C values are from acidified subsamples for calcifying organisms.

1. Holothuroidea
   rank: class
2. Mollusca
   rank: phylum
3. Arthropoda
   rank: phylum
4. Sagittidae
   rank: family
5. Testudines
   rank: order
6. Cumacea
   rank: order
7. Amphipoda
   rank: order
8. Semaeostomeae
   rank: order
9. Calanoida
   rank: order
10. Globorotaliidae
    rank: family
11. Decapoda
    rank: order
12. Chromista
    rank: kingdom
13. Porifera
    rank: phylum
14. Globothalamea
    rank: class
15. Animalia
    rank: kingdom
16. Clionidae
    rank: family
17. Ampharetidae
    rank: family
18. Coronatae
    rank: order
19. Eunicidae
    rank: family
20. Tubothalamea
    rank: class
21. Hyperiidae
    rank: family
22. Tanaidacea
    rank: order
23. Cydippida
    rank: order
24. Annelida
    rank: phylum
25. Polychaeta
    rank: class
26. Eunicida
    rank: order
27. Gammaridae
    rank: family
28. Chordata
    rank: phylum
29. Rotaliida
    rank: order
30. Tanaidæ
    rank: family
31. Sagittoidea
    rank: class
32. Atollidae
    rank: family
33. Aphragmophora
    rank: order
34. Calanidae
    rank: family
35. Copepoda
    rank: class
36. Cyaneidae
    rank: family
37. Ctenophora
    rank: phylum
38. Mertensiidae
    rank: family
39. Acanthephyridae
    rank: family
40. Priapulida
    rank: phylum
41. Chaetognatha
    rank: phylum
42. Tentaculata
    rank: class
43. Terebellida
    rank: order
44. Eusiridae
    rank: family
45. Foraminifera
    rank: phylum
46. Pteropoda
    rank: order
47. Chelidae
    rank: family
48. Scyphozoa
    rank: class
49. Hauerinidae
    rank: family
50. Hexactinellida
    rank: class
51. Sipuncula
    rank: order
52. Malacostraca
    rank: class
53. Miliolida
    rank: order
54. Gastropoda
    rank: class
55. Cnidaria
    rank: phylum
56. Echinodermata
    rank: phylum

The data all come from the JC2-2 expedition of the Nansen Legacy to the Nansen and Amundsen Basins in Aug-Sept 2021 (Fransson et al. 2022, https://doi.org/10.7557/nlrs.6413 ) where 5 stations were sampled from sea ice to seafloor.