Antarctic Food Web. Krill in Antarctic Food Webs Phytoplankton.

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Presentation transcript:

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 Fastest winter warming location on Earth Increase in ocean heat content Martinson et al Q slope (x10 9 J m -2 ) °C Increase of 6°C in the past 50 years 50-year changes in winter air temperature Heat content (x10 9 J m -2 ) Seawater heat content

Questions?

100 μm 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 10 μm

100 μm 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 10 μm

100 μm 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 10 μm

Recent changes in Adélie Penguins Salinity (p.p.t) % Cryptophytes °W Palmer Station Antarctic Peninsula 65°S Adélie penguins, increases in subpolar species (Gentoos, Chinstraps) Decrease in Adélie penguins, increases in subpolar species (Gentoos, Chinstraps) Line 600 (north)

Questions?