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Antarctic Food Web

Antarctic Food Web. Krill in Antarctic Food Webs. Phytoplankton. Krill Swarms. Phytoplankton. Antarctic Circumpolar Current (ACC). The WAP is the location where the ACC is closest to the continent. Using the WAP as zone to study how rapid warming can alter food webs.

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Antarctic Food Web

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  1. Antarctic Food Web

  2. Krill in Antarctic Food Webs Phytoplankton

  3. Krill Swarms Phytoplankton

  4. Antarctic Circumpolar Current (ACC) The WAP is the location where the ACC is closest to the continent

  5. Using the WAP as zone to study how rapid warming can alter food webs 50-year changes in winter air temperature Seawater heat content Heat content (x109 J m-2) Fastest winter warming location on Earth °C Increase of 6°C in the past 50 years Qslope (x109 J m-2) Increase in ocean heat content Martinson et al. 2008

  6. Questions?

  7. Recent rapid warming at WAP reverberates through the food web • Declines in phytoplankton and shift to small cell size that krill can not feed on (but salps can) • Declines in nutritious Antarctic krill; increase in much less nutritious gelatinous salps • Declines in krill and ice-dependent Adélie penguins, but increases in subpolar (warmer adapted) species, Gentoo and Chinstraps, that can dive deep and eat deep-water fish 100 μm 10 μm

  8. Recent rapid warming at WAP reverberates through the food web • Declines in phytoplankton and shift to small cell size that krill can not feed on (but salps can) • Declines in nutritious Antarctic krill; increase in much less nutritious gelatinous salps • Declines in krill and ice-dependent Adélie penguins, but increases in subpolar (warmer adapted) species, Gentoo and Chinstraps, that can dive deep and eat deep-water fish 100 μm 10 μm

  9. Recent rapid warming at WAP reverberates through the food web • Declines in phytoplankton and shift to small cell size that krill can not feed on (but salps can) • Declines in nutritious Antarctic krill; increase in much less nutritious gelatinous salps • Declines in krill- and ice-dependent Adélie penguins, but increases in subpolar (warmer adapted) species, Gentoo and Chinstraps, that can dive deep and eat deep-water fish 100 μm 10 μm

  10. 33.3 33.6 33.8 64°W 0 25 50 65°S 65°S Salinity (p.p.t) Palmer Station Antarctic Peninsula % Cryptophytes Recent changes in Adélie Penguins • DecreaseinAdélie penguins, increases in subpolar species (Gentoos, Chinstraps) Line 600 (north)

  11. Questions?

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