Seasonal Krill Aggregation

Assembled from 50 blocks · 2 evidence · 85 related

1. Story
2. The seasonal concentration of euphausiids into dense swarms where upwelling or ice-edge production makes enough phytoplankton to support them. It is the variable that decides the migration: blue whale feeding grounds are not where the water is nicest but where krill is dense enough for lunge feeding to pay. In the Southern Ocean the driver is the ice edge and the circumpolar production it supports; in the California Current it is wind-driven coastal upwelling, and the whales there preferentially target the larger, more lipid-rich Thysanoessa spinifera in shallow water over Euphausia pacifica offshore. The route follows the food, and the food follows the physics.
3. Knowledge
4. California Current System
5. Point Conception
6. Seasonal Krill Aggregation
7. Southern Ocean
8. Connections
9. Antarctic Summer Feeding Migration
10. Point Conception
11. California Current System
12. Southern Ocean
13. Rorqual Lunge Feeding
14. Whale-Mediated Iron Recycling
15. The energetics of blue whale lunge feeding are modelled
16. Santa Barbara Channel
17. Seasonal Krill Aggregation
18. Eastern North Pacific Blue Whale Migration
19. Santa Barbara Channel
20. Seasonal Krill Aggregation
21. Satellite tagging of eastern North Pacific blue whales begins
22. Eastern North Pacific blue whales are estimated near carrying capacity
23. Antarctic Blue Whale (B. m. intermedia)
24. Antarctic Summer Feeding Migration
25. South Georgia
26. Southern Ocean Whale Sanctuary
27. Seasonal Krill Aggregation
28. The factory ship Lancing takes a stern slipway south
29. The Antarctic blue whale catch reaches its all-time peak
30. The Southern Ocean Whale Sanctuary is adopted
31. Dedicated Antarctic Blue Whale Project voyages
32. Baleen whale consumption is re-measured, and the krill paradox sharpens
33. The only published Antarctic blue whale satellite tracks are released as data
34. Antarctic Krill (Euphausia superba)
35. Arctic Tern (Sterna paradisaea)
36. CCAMLR is agreed at Canberra
37. A long-term decline in krill density is linked to winter sea ice
38. CCAMLR adopts the Ross Sea marine protected area
39. Antarctic sea ice reaches a record low, a year after the previous one
40. Antarctic Circumpolar Current (ACC)
41. Antarctica
42. Thermohaline Circulation
43. North Atlantic — Grand Banks approaches
44. Weddell Sea
45. A circumpolar current becomes possible
46. Antarctic meltwater is projected to slow the abyssal cell
47. A physics-based early warning signal is proposed
48. Evidence
49. Euphausia pacifica and Thysanoessa spinifera dominate the California Current preyscape; blue whales there feed on T. spinifera in shallow water under about 100 m and on E. pacifica at the shelf edge and offshore, preferentially targeting the larger, more lipid-rich T. spinifera. Blue whales arrive in late spring and early summer and feed until late autumn or early winter, concentrating in cold, well-mixed water upwelled north of Point Conception and advected south, near San Miguel and Santa Rosa Islands. V55 verification basis: retrieved in search summary attributed to this literature; the papers were not fetched.
50. The most recent synoptic survey of CCAMLR Area 48 (Antarctic Peninsula and Scotia Sea) estimated Antarctic krill biomass there at 62.6 million tonnes in 2019; published Southern Ocean totals for the species span roughly 60 to 420 million tonnes. V55 verification basis: retrieved in search summary attributed to CCAMLR material; the survey report was not fetched, and the Area 48 figure and the ocean-wide range are not on the same methodological footing.