1. Stark, J. S., Raymond, T., Deppeler, S. L. & Morrison, A. K. Antarctic Seas. World Seas: an Environmental Evaluation (Elsevier, 2019).

2. Chown, S. L. & Brooks, C. M. The state and future of Antarctic environments in a global context. Annu. Rev. Environ. Resour. 44, 1–30 (2019).

3. Ainley, D. G. & Blight, L. K. Ecological repercussions of historical fish extraction from the Southern Ocean. Fish Fish. 10, 13–38 (2009).

4. Agnew, D. J., Hill, S. L., Beddington, J. R., Purchase, L. V. & Wakeford, R. C. Sustainability and management of southwest Atlantic squid fisheries. Bull. Mar. Sci. 76, 579–594 (2005).

5. Kock, K. H., Reid, K., Croxall, J. & Nicol, S. Fisheries in the Southern Ocean: an ecosystem approach. Phil. Trans. R. Soc. B. 362, 2333–2349 (2007).

6. Nicol, S., Foster, J. & Kawaguchi, S. The fishery for Antarctic krill—recent developments. Fish Fish. 13, 30–40 (2012).

7. Swart, N. C., Gille, S. T., Fyfe, J. C. & Gillett, N. P. Recent Southern Ocean warming and freshening driven by greenhouse gas emissions and ozone depletion. Nat. Geosci. 11, 836–841 (2018).

8. Convention on Biological Diversity. Decisions Adopted by the Conference of the Parties to the Convention on Biological Diversity at its Ninth Meeting. Report No. UNEP/CBD/COP/9/29 (CBD, 2008).

9. Visconti, P. et al. Protected area targets post-2020. Science 364, 239–241 (2019).

10. Hazen, E. L. et al. Marine top predators as climate and ecosystem sentinels. Front. Ecol. Environ. 17, 565–574 (2019).

11. Constable, A. J. et al. Developing priority variables (“ecosystem Essential Ocean Variables”—eEOVs) for observing dynamics and change in Southern Ocean ecosystems. J. Mar. Syst. 161, 26–41 (2016).

12. Reid, K., Croxall, J. P., Briggs, D. R. & Murphy, E. J. Antarctic ecosystem monitoring: quantifying the response of ecosystem indicators to variability in Antarctic krill. ICES J. Mar. Sci. 62, 366–373 (2005).

13. Cury, P. M. et al. Global seabird response to forage fish depletion—one-third for the birds. Science 334, 1703–1706 (2011).

14. Nicol, S. et al. Ocean circulation off east Antarctica affects ecosystem structure and sea-ice extent. Nature 406, 504–507 (2000).

15. Hays, G. C. et al. Translating marine animal tracking data into conservation policy and management. Trends Ecol. Evol. 34, 459–473 (2019).

16. Ropert-Coudert, Y. et al. The Retrospective Analysis of Antarctic Tracking Data project. Sci. Data https://doi.org/10.1038/s41597-020-0406-x (2020).

17. Hindell, M. A. et al. in The Kerguelen Plateau: Marine Ecosystem and Fisheries (eds Duhamel, G. & Welsford, D.) 203–215 (Societe Francaise d’Ichtyologie, 2011).

18. Tittensor, D. P. et al. Global patterns and predictors of marine biodiversity across taxa. Nature 466, 1098–1101 (2010).

19. Hindell, M. A. et al. Decadal changes in habitat characteristics influence population trajectories of southern elephant seals. Glob. Chang. Biol. 23, 5136–5150 (2017).

20. Sallée, J.-B., Speer, K. G. & Rintoul, S. R. Zonally asymmetric response of the Southern Ocean mixed-layer depth to the Southern Annular Mode. Nat. Geosci. 3, 273–279 (2010).

21. Davies, R. G., Irlich, U. M., Chown, S. L. & Gaston, K. J. Ambient, productive and wind energy, and ocean extent predict global species richness of procellariiform seabirds. Glob. Ecol. Biogeogr. 19, 98–110 (2010).

22. Ardyna, M. et al. Delineating environmental control of phytoplankton biomass and phenology in the Southern Ocean. Geophys. Res. Lett. 44, 5016–5024 (2017).

23. Ropert-Coudert, Y. et al. in Biogeographic Atlas of the Southern Ocean (eds De Broyer, C. et al.) 364–387 (Scientific Committee on Antarctic Research, 2014).

24. Atkinson, A. et al. Oceanic circumpolar habitats of Antarctic krill. Mar. Ecol. Prog. Ser. 362, 1–23 (2008).

25. Nicol, S. & Raymond, B. in Antarctic Ecosystems: an Extreme Environment in a Changing World (eds Rogers, A. D. et al.) 243–254 (Wiley, 2012).

26. Constable, A. J. et al. Climate change and Southern Ocean ecosystems I: how changes in physical habitats directly affect marine biota. Glob. Chang. Biol. 20, 3004–3025 (2014).

27. Meijers, A. J. S. The Southern Ocean in the Coupled Model Intercomparison Project phase 5. Phil. Trans. R. Soc. A 372, 20130296 (2014).

28. Dayton, P. K., Thrush, S. F., Agardy, M. T. & Hofman, R. J. Environmental effects of marine fishing. Aquat. Conserv. 5, 205–232 (1995).

29. Kroodsma, D. A. et al. Tracking the global footprint of fisheries. Science 359, 904–908 (2018).

30. Mormede, S., Dunn, A., Parker, S. & Hanchet, S. Using spatial population models to investigate the potential effects of the Ross Sea region Marine Protected Area on the Antarctic toothfish population. Fish. Res. 190, 164–174 (2017).

31. Massom, R. A. & Stammerjohn, S. E. Antarctic sea ice change and variability—physical and ecological implications. Polar Sci. 4, 149–186 (2010).

32. Vaughan, D. et al. in Climate Change 2013: the Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (eds Stocker, T. F. et al.) 317–382 (Cambridge University Press, 2013).

33. Game, E. T. et al. Pelagic protected areas: the missing dimension in ocean conservation. Trends Ecol. Evol. 24, 360–369 (2009).

34. Harrison, A.-L. et al. The political biogeography of migratory marine predators. Nat. Ecol. Evol. 2, 1571–1578 (2018).

35. Hilborn, R. Policy: marine biodiversity needs more than protection. Nature 535, 224–226 (2016).

36. Phillips, R. A. et al. The conservation status and priorities for albatrosses and large petrels. Biol. Conserv. 201, 169–183 (2016).

37. Constable, A. J., De LaMare, W. K., Agnew, D. J., Everson, I. & Miller, D. Managing fisheries to conserve the Antarctic marine ecosystem: practical implementation of the Convention on the Conservation of Antarctic Marine Living Resources (CCAMLR). ICES J. Mar. Sci. 57, 778–791 (2000).

38. Sala, E. et al. Assessing real progress towards effective ocean protection. Mar. Policy 91, 11–13 (2018).

39. Roberts, C. M. et al. Marine reserves can mitigate and promote adaptation to climate change. Proc. Natl Acad. Sci. USA 114, 6167–6175 (2017).

40. Moss, R. H. et al. The next generation of scenarios for climate change research and assessment. Nature 463, 747–756 (2010).

41. Peters, G. P. et al. The challenge to keep global warming below 2 °C. Nat. Clim. Chang. 3, 4–6 (2013).

42. Péron, C., Weimerskirch, H. & Bost, C.-A. Projected poleward shift of king penguins’ (Aptenodytes patagonicus) foraging range at the Crozet Islands, southern Indian Ocean. Proc. R. Soc. Lond. B 279, 2515–2523 (2012).

43. Atkinson, A. et al. Krill (Euphausia superba) distribution contracts southward during rapid regional warming. Nat. Clim. Chang. 9, 142–147 (2019).

44. Atkinson, A., Siegel, V., Pakhomov, E. & Rothery, P. Long-term decline in krill stock and increase in salps within the Southern Ocean. Nature 432, 100–103 (2004).

45. Weimerskirch, H., Louzao, M., de Grissac, S. & Delord, K. Changes in wind pattern alter albatross distribution and life-history traits. Science 335, 211–214 (2012).

46. Cristofari, R. et al. Climate-driven range shifts of the king penguin in a fragmented ecosystem. Nat. Clim. Chang. 8, 245–251 (2018).

47. Southwell, C. et al. Recent studies overestimate colonization and extinction events for Adelie penguin breeding colonies. Auk 134, 39–50 (2017).

48. Jacquet, J., Blood-Patterson, E., Brooks, C. & Ainley, D. ‘ Rational use ’ in Antarctic waters. Mar. Policy 63, 28–34 (2016).

49. Grémillet, D. et al. Persisting worldwide seabird-fishery competition despite seabird community decline. Curr. Biol. 28, 4009–4013 (2018).

50. Block, B. A. et al. Tracking apex marine predator movements in a dynamic ocean. Nature 475, 86–90 (2011).

51. Queiroz, N. et al. Global spatial risk assessment of sharks under the footprint of fisheries. Nature 572, 461–466 (2019).

52. Raymond, B. et al. Important marine habitat off east Antarctica revealed by two decades of multi-species predator tracking. Ecography 38, 121–129 (2015).

53. Reisinger, R. R. et al. Habitat modelling of tracking data from multiple marine predators identifies important areas in the Southern Indian Ocean. Divers. Distrib. 24, 535–550 (2018).

54. R Core Team. R: a language and environment for statistical computing. (R Foundation for Statistical Computing, 2018).

55. Jonsen, I. D. et al. Movement responses to environment: fast inference of variation among southern elephant seals with a mixed effects model. Ecology 100, e02566 (2019).

56. Aarts, G., MacKenzie, M., McConnell, B., Fedak, M. & Matthiopoulos, J. Estimating space-use and habitat preference from wildlife telemetry data. Ecography 31, 140–160 (2008).

57. Elith, J., Leathwick, J. R. & Hastie, T. A working guide to boosted regression trees. J. Anim. Ecol. 77, 802–813 (2008).

58. Pya, N. & Wood, S. N. Shape constrained additive models. Stat. Comput. 25, 543–559 (2015).

59. Phillips, S. J. et al. Sample selection bias and presence-only distribution models: implications for background and pseudo-absence data. Ecol. Appl. 19, 181–197 (2009).

60. Rintoul, S. R. The global influence of localized dynamics in the Southern Ocean. Nature 558, 209–218 (2018).

61. World Meteorological Organization. Guide to Climatological Practices (WMO No. 100) (World Meteorological Organization, 2011).

62. Halpern, B. S., Selkoe, K. A., Micheli, F. & Kappel, C. V. Evaluating and ranking the vulnerability of global marine ecosystems to anthropogenic threats. Conserv. Biol. 21, 1301–1315 (2007).

63. He, J. et al. Impact of ocean eddy resolution on the sensitivity of precipitation to CO 2 increase. Geophys. Res. Lett. 45, 7194–7203 (2018).

64. Williams, J. W., Jackson, S. T. & Kutzbach, J. E. Projected distributions of novel and disappearing climates by 2100 AD. Proc. Natl Acad. Sci. USA 104, 5738–5742 (2007).