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Title:

Winter

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Title: Winter Author: Felix Unger Last modified by: Windows User Created Date: 5/1/2007 7:38:04 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

Number of Views:132
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Slides: 65
Provided by: Felix160
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Tags: flakes | snow | winter

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Title: Winter


1
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2
Winter Ecology
3
Why is it cold in winter?
  • Were farther away from the sun?
  • NO!!
  • Were tilted away from the sun?
  • YES!!

4
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5
Scranton, PA
6
Scranton, PAWeather Records
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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.
9
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.
10
Types of Snow Flakes
Simple Prisms
11
Plates
12
Stellar Dendrites
13
Fernlike Stellar Dendrites
14
Columns, Needles and Capped Columns
15
Triangular Crystals
16
12 Sided Snowflake
17
Life History of a Snowstorm
  • Powder
  • Destructive metamorphism
  • Constructive metamorphism
  • Melt metamorphism

18
Powder
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Destructive Metamorphism
20
Quin-zhee- Athabascan origin
21
Constructive Metamorphism
  • Temperature gradient in snowpackwhere 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 packavalanche danger!

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Scranton, PA.A Winter Vacationland?
24
Northern Shrike
Common Redpoll
25
Evening GrosbeaksFlying Pigs
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Short-eared Owls
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Rough-legged Hawk
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What Do Organisms Do in Winter?
  • Die
  • Migrate
  • Hibernate
  • Stay and tough it out!

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DIE?
35
DIE?
36
Why Migrate?
  • The Pros
  • ?
  • The Cons
  • DANGEROUS! (more than half never return)
  • DANGEROUS!! (going to unknown area hiding
    places, food sources, etc.)
  • DANGEROUS!!! (already inhabited with competitors)

37
Who Migrates?Many organisms do . . .
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. . . Even Mammals
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Stay and Tough it Out
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http//www.youtube.com/watch?vD2SoGHFM18I
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Freeze
48
What do herps do in winter?
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Avoid Freezing
Garter Snake hibernaculum in Canada
51
Winter Insects
52
Winter Insects and Invertebrates
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Animal Tracks in the Snow.
56
Opossum
  • Pacer

57
Beaver
58
Black Bear Tracks
  • Pacer
  • Front 5 in. L X 5 in. W
  • Hind 7 in L X 5 in. W

              

59
Bobcat
  • Notice you dont see any claws.
  • Diagonal Walker

60
Coyote
  • Diagonal Walker
  • Notice the claws

61
Raccoon
  • Pacer

62
Gray Squirrel
  • Gray Squirrel are Hoppers.

63
Wild Turkey
  • Diagonal Walker

64
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