A long-term decline in krill density is linked to winter sea ice

Assembled from 61 blocks · 1 evidence · 89 related

1. Story
2. An analysis of decades of net-haul records from the Southern Ocean reports that krill density in the southwest Atlantic sector declined over the second half of the twentieth century, correlating with reduced winter sea-ice extent, while salps increased. It is the paper that made the krill-ice dependency a matter of measured record rather than of inference from life history, and the size of the decline has been argued over ever since.
3. Knowledge
4. Sea Ice
5. Antarctic Krill (Euphausia superba)
6. A long-term decline in krill density is linked to winter sea ice
7. Southern Ocean
8. Connections
9. Antarctic Krill (Euphausia superba)
10. Sea Ice
11. Southern Ocean
12. Blue Whale (Balaenoptera musculus)
13. Commission for the Conservation of Antarctic Marine Living Resources
14. Baleen whale consumption is re-measured, and the krill paradox sharpens
15. Antarctic Polar Front (Antarctic Convergence)
16. Sea Ice
17. Southern Ocean
18. Emperor Penguin (Aptenodytes forsteri)
19. CCAMLR is agreed at Canberra
20. A long-term decline in krill density is linked to winter sea ice
21. CCAMLR adopts the Ross Sea marine protected area
22. Polynya
23. Arctic Amplification
24. Antarctic Krill (Euphausia superba)
25. Polar Bear (Ursus maritimus)
26. Emperor Penguin (Aptenodytes forsteri)
27. Halley Bay Emperor Penguin Colony
28. The continuous satellite sea-ice record begins
29. A long-term decline in krill density is linked to winter sea ice
30. The Arctic summer minimum drops far below anything previously observed
31. The lowest Arctic sea-ice extent in the satellite record
32. The Halley Bay emperor colony fails and does not recover
33. The emperor penguin is listed as threatened under the US Endangered Species Act
34. Antarctic sea ice reaches a record low, a year after the previous one
35. Antarctic Blue Whale (B. m. intermedia)
36. Antarctic Summer Feeding Migration
37. South Georgia
38. Southern Ocean Whale Sanctuary
39. Seasonal Krill Aggregation
40. The factory ship Lancing takes a stern slipway south
41. The Antarctic blue whale catch reaches its all-time peak
42. The Southern Ocean Whale Sanctuary is adopted
43. Dedicated Antarctic Blue Whale Project voyages
44. Baleen whale consumption is re-measured, and the krill paradox sharpens
45. The only published Antarctic blue whale satellite tracks are released as data
46. Antarctic Krill (Euphausia superba)
47. Arctic Tern (Sterna paradisaea)
48. CCAMLR is agreed at Canberra
49. A long-term decline in krill density is linked to winter sea ice
50. CCAMLR adopts the Ross Sea marine protected area
51. Antarctic sea ice reaches a record low, a year after the previous one
52. Antarctic Circumpolar Current (ACC)
53. Antarctica
54. Thermohaline Circulation
55. North Atlantic — Grand Banks approaches
56. Weddell Sea
57. A circumpolar current becomes possible
58. Antarctic meltwater is projected to slow the abyssal cell
59. A physics-based early warning signal is proposed
60. Evidence
61. Analysis of a compiled database of scientific net hauls indicates a long-term decline in Antarctic krill density in the southwest Atlantic sector, correlated with reduced winter sea-ice extent, together with an increase in salp abundance. V55 VERIFICATION BASIS: not opened during production; no research channel was available. The magnitude of the reported decline is deliberately not quoted anywhere in this pack, because subsequent work has contested it and the figure could not be checked.