Antarctica ii l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 18

Antarctica II PowerPoint PPT Presentation


  • 66 Views
  • Uploaded on
  • Presentation posted in: General

Antarctica II. Stuff you might not know about life on (and around) the frozen continent. Terrestrial animals. Rotifer. Nematode. Tardigrade. Springtail. Mite. Belgica antarctica – the Antarctic Midge. Truly weird habitats. Lake Vostok. Adelie penguin. Animalia; Chordata; Aves

Download Presentation

Antarctica II

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Antarctica II

Stuff you might not know about life on (and around) the frozen continent


Terrestrial animals

Rotifer

Nematode

Tardigrade

Springtail

Mite


Belgica antarctica – the Antarctic Midge


Truly weird habitats

  • Lake Vostok


Adelie penguin

  • Animalia; Chordata; Aves

  • Sphenisciformes; Spheniscidae

  • Pygoscelis adeliae

Dumont d’Urville (1790-1842)


Adelie Penguin colonies

  • 500 – 250,000 individuals


Adult Adelie penguins

  • Males arrive, build ‘nest’, compete for mates

  • Competition for stones

  • Females arrive, lay egg, share incubation with male (although she often disappears for 10 days at a time!)

  • Incubation and feeding shared


Life cycle of an Adelie Penguin

  • Hatch, eat and eat and eat…


Life cycle of an Adelie Penguin

  • Hatch, eat and eat and eat…

  • Get REALLY BIG

  • Nests break down and chicks form Creches

  • Chick goes through rebellious teen years, moults and goes to sea for 1-3 years, coming ashore only to moult once a year


Thermal issues

  • Water is cold!

  • Ice is cold!

  • Nest is cold!

  • Air is cold (but doesn’t dissipate heat easily)


Predators and mortality

  • Leopard seals (in water)

  • Skuas (of chicks and eggs)

  • ~95% mortality between fledging and first reproduction

    • Life history consequences


Links to the ocean

  • Colony sites are all on ice-free ground near open water

    • Changes in availability of ice = changes in number of colonies

    • Walking to reach water = very expensive

    • Change in diet during season

    • If fishery crashes, so do the penguins


Penguins track the environment

The Adelie Penguin: Bellwether of climate change

David Ainley


Why don’t fish freeze?

Water temperature?


Why don’t fish freeze?

  • Seawater temperature:

    • -1.86 °C

  • Melting point of body fluids:

    • -0.6 °C


Why don’t fish freeze?

  • Fish are regularly in contact with ice


Why don’t fish freeze?

  • The freezing point is not the same as the melting point

    • “Thermal Hysteresis”

  • Antifreeze proteins

Arthur L. De Vries


Why don’t fish freeze?

  • Antifreeze proteins

    • Made in the pancreas

    • Circulate throughout body fluids

    • Prevent ice crystals in the fish from growing


  • Login