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Winter Ecology

Winter Ecology. Why is it cold in winter?. We’re farther away from the sun? NO!! We’re tilted away from the sun? YES!!. Scranton, PA. Scranton, PA Weather Records. Types of Snow Crystals:. The most basic snow crystal is a hexagonal prism and can come in many shapes and sizes.

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Winter Ecology

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  1. Winter Ecology

  2. Why is it cold in winter? • We’re farther away from the sun? NO!! • We’re tilted away from the sun? YES!!

  3. Scranton, PA

  4. Scranton, PAWeather Records

  5. Types of Snow Crystals: The most basic snow crystal is a hexagonal prism and can come in many shapes and sizes. The prism has 8 sides: 2 surfaces known as basal facets and 6 prism facets.

  6. How does a dull hexagonal ice crystal make such beautiful and elaborate flakes? The intricate flakes come from the condition in which the ice crystals are formed.

  7. Types of Snow Flakes Simple Prisms

  8. Plates

  9. Stellar Dendrites

  10. Fernlike Stellar Dendrites

  11. Columns, Needles and Capped Columns

  12. Triangular Crystals

  13. 12 Sided Snowflake

  14. Life History of a Snowstorm • Powder • Destructive metamorphism • Constructive metamorphism • Melt metamorphism

  15. Powder

  16. Destructive Metamorphism

  17. Quin-zhee- Athabascan origin

  18. Constructive Metamorphism • Temperature gradient in snowpack…where is it warmer, top or bottom? • Ice sublimates, vapors moving up • Warmer top melts a little, joining grains as it refreezes • Lower sublimation continues, leaving depth hoar • Creates subnivean zone • Destabilizes snow pack…avalanche danger!

  19. Scranton, PA….A Winter Vacationland?

  20. Northern Shrike Common Redpoll

  21. Evening Grosbeaks“Flying Pigs”

  22. Short-eared Owls

  23. Rough-legged Hawk

  24. What Do Organisms Do in Winter? • Die • Migrate • Hibernate • Stay and tough it out!

  25. DIE?

  26. DIE?

  27. The Pro’s ? The Con’s DANGEROUS! (more than half never return) DANGEROUS!! (going to unknown area; hiding places, food sources, etc.) DANGEROUS!!! (already inhabited with competitors) Why Migrate?

  28. Who Migrates?Many organisms do . . .

  29. . . . Even Mammals

  30. Stay and Tough it Out

  31. http://www.youtube.com/watch?v=D2SoGHFM18I

  32. Freeze

  33. What do ‘herps’ do in winter?

  34. Avoid Freezing Garter Snake hibernaculum in Canada

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