Antarctic Summer Feeding Migration

Assembled from 64 blocks · 3 evidence · 87 related

1. Story
2. The austral-summer movement of Antarctic blue whales into high-latitude Southern Ocean waters to feed on krill, and the return north in winter toward lower latitudes. It is the least directly observed of the major blue whale migrations. Nearly everything known about it comes from three indirect sources - the geography of the historical catch, passive acoustic detections of the Antarctic Z-call across the Southern Ocean, and photo-identification re-sightings - because only two Antarctic blue whales have ever carried a satellite tag whose data has been published, one of which covered a minimum of 1,390 km southeast over 13 days. The winter destination of most of the population is not established.
3. Knowledge
4. Antarctic Summer Feeding Migration
5. South Georgia
6. Seasonal Krill Aggregation
7. Passive Acoustic Monitoring Arrays
8. Southern Ocean
9. Connections
10. Northern Indian Ocean Blue Whale (putative B. m. indica)
11. Seasonal Krill Aggregation
12. Passive Acoustic Monitoring Arrays
13. Southern Ocean
14. South Georgia
15. The only published Antarctic blue whale satellite tracks are released as data
16. Antarctic Summer Feeding Migration
17. Point Conception
18. California Current System
19. Southern Ocean
20. Rorqual Lunge Feeding
21. Whale-Mediated Iron Recycling
22. The energetics of blue whale lunge feeding are modelled
23. Antarctic Summer Feeding Migration
24. IWC Southern Ocean Research Partnership
25. The 52 Hz call is identified in Navy hydrophone data
26. The SOSUS mission is declassified
27. Blue whale song frequencies are observed falling worldwide
28. Blue whales are found back at South Georgia
29. Antarctic Blue Whale (B. m. intermedia)
30. Antarctic Summer Feeding Migration
31. South Georgia
32. Southern Ocean Whale Sanctuary
33. Seasonal Krill Aggregation
34. The factory ship Lancing takes a stern slipway south
35. The Antarctic blue whale catch reaches its all-time peak
36. The Southern Ocean Whale Sanctuary is adopted
37. Dedicated Antarctic Blue Whale Project voyages
38. Baleen whale consumption is re-measured, and the krill paradox sharpens
39. The only published Antarctic blue whale satellite tracks are released as data
40. Antarctic Krill (Euphausia superba)
41. Arctic Tern (Sterna paradisaea)
42. CCAMLR is agreed at Canberra
43. A long-term decline in krill density is linked to winter sea ice
44. CCAMLR adopts the Ross Sea marine protected area
45. Antarctic sea ice reaches a record low, a year after the previous one
46. Antarctic Circumpolar Current (ACC)
47. Antarctica
48. Thermohaline Circulation
49. North Atlantic — Grand Banks approaches
50. Weddell Sea
51. A circumpolar current becomes possible
52. Antarctic meltwater is projected to slow the abyssal cell
53. A physics-based early warning signal is proposed
54. Antarctic Summer Feeding Migration
55. Southern Ocean
56. Grytviken Whaling Station
57. Whaling begins at Grytviken, South Georgia
58. Whaling ends at South Georgia
59. Blue whales are found back at South Georgia
60. An individual Antarctic blue whale is re-sighted at South Georgia
61. Evidence
62. Two Antarctic blue whales tagged in the east Antarctic sector during an austral summer produced what the paper describes as the first and only satellite tracks in existence for the subspecies; one animal (PTT 121205) covered a minimum of 1,390 km southeast over 13 days. V55 verification basis: retrieved in search summary attributed to this data paper; the paper was not fetched, and the deployment year of the tags was not captured.
63. Antarctic blue whales produce a characteristic three-part Z-call: a first unit of 8-12 s at about 28 Hz, a short downsweep from 28 to 19 Hz, and a third unit of 8-12 s between 19 and 17 Hz, lasting up to about 18 s in total. The SORP Acoustic Trends working group had access to more than 300,000 hours of Southern Ocean passive acoustic data as of March 2020, collected over roughly twenty years from ships and moored recorders. V55 verification basis: retrieved in search summary attributed to these sources; neither paper was fetched.
64. Southern Hemisphere blue whale catches in the twentieth century totalled roughly 360,000 animals - about 330,000 in the Antarctic and about 33,000 elsewhere in the Southern Hemisphere - with the count running until Soviet illegal whaling stopped in the 1970s. V55 verification basis: the catch totals were retrieved in search summary attributed to this work; the paper itself was not read, as WebFetch is blocked at this environment's egress proxy.