Arctic Tern (Sterna paradisaea)

Assembled from 46 blocks · 1 evidence · 85 related

1. Story
2. A small seabird that breeds around the Arctic and winters in the pack ice of the Southern Ocean, making it the one animal that experiences both systems in the same year and the longest known animal migration. Geolocator tracking published in 2010 followed birds from Greenland and Iceland and found annual round trips on the order of seventy thousand kilometres, with routes that are not straight lines but long looping tracks exploiting prevailing wind systems, including a mid-Atlantic staging pause. The tern is the useful corrective to the whole framing of this Journey: the two poles are structurally opposite and biologically almost entirely separate, and a bird weighing about a hundred grams treats them as two ends of one commute.
3. Knowledge
4. Arctic Ocean
5. Arctic Tern (Sterna paradisaea)
6. Southern Ocean
7. Connections
8. Arctic Ocean
9. Southern Ocean
10. Antarctica
11. Arctic Amplification
12. Polar Bear (Ursus maritimus)
13. Arctic Tern (Sterna paradisaea)
14. Arctic Council
15. Inuit
16. The continuous satellite sea-ice record begins
17. The Arctic summer minimum drops far below anything previously observed
18. The lowest Arctic sea-ice extent in the satellite record
19. Seven Arctic states pause participation in the Arctic Council
20. Antarctic Blue Whale (B. m. intermedia)
21. Antarctic Summer Feeding Migration
22. South Georgia
23. Southern Ocean Whale Sanctuary
24. Seasonal Krill Aggregation
25. The factory ship Lancing takes a stern slipway south
26. The Antarctic blue whale catch reaches its all-time peak
27. The Southern Ocean Whale Sanctuary is adopted
28. Dedicated Antarctic Blue Whale Project voyages
29. Baleen whale consumption is re-measured, and the krill paradox sharpens
30. The only published Antarctic blue whale satellite tracks are released as data
31. Antarctic Krill (Euphausia superba)
32. Arctic Tern (Sterna paradisaea)
33. CCAMLR is agreed at Canberra
34. A long-term decline in krill density is linked to winter sea ice
35. CCAMLR adopts the Ross Sea marine protected area
36. Antarctic sea ice reaches a record low, a year after the previous one
37. Antarctic Circumpolar Current (ACC)
38. Antarctica
39. Thermohaline Circulation
40. North Atlantic — Grand Banks approaches
41. Weddell Sea
42. A circumpolar current becomes possible
43. Antarctic meltwater is projected to slow the abyssal cell
44. A physics-based early warning signal is proposed
45. Evidence
46. Miniature geolocators fitted to Arctic terns breeding in Greenland and Iceland recorded annual round-trip migrations on the order of 70,000 km between Arctic breeding grounds and Southern Ocean wintering areas, following looping routes shaped by prevailing winds rather than direct tracks. V55 VERIFICATION BASIS: not opened during production; no research channel was available. Later tracking of other populations has reported longer distances, so the figure should be presented as this study's result and not as the species maximum.