An Independent Philanthropic Trust Helen’s Legacy to Victoria, Australia.
Succession.... Mount St. Helen’s Video Mount St. Helen’s Video Part 1.
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Transcript of Succession.... Mount St. Helen’s Video Mount St. Helen’s Video Part 1.
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Succession...
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Mount St. Helen’s Video
Part 1
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What is Succession?
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Succession
An orderly change in communities of organisms that occurs over time
Primary Succession- begins with bare rock after geologic activity (ex: volcano)
Secondary Succession- begins on soil from which previous community has been removed (fire, agriculture...)
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Primary Succession
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Secondary Succession
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Think about here...An area of the
field outside is left to grow, how would it change over time?
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Field Succession
Grass Shrubs Trees Forest
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Primary or Secondary?
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Primary or Secondary?
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Primary or Secondary?
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Primary or Secondary?
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Pioneer Species- the first to arrive
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Climax Community- the final goal
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How Does an Ecosystem “Start Over”?
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Clear Cutting- People can speed up succession after by planting trees
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Lava Flow- New rock over top.
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Fire- cleans out an area
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Palmetto vs Scrub Oak
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Some Disturbance is Devastating
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How about a water system?
Take the picture and try and place them in order from beginning of succession to climax community in order.
Good Luck!
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Pioneer Stage• Bare muddy or
sandy bottom
• Algae is primary producer
•Caddisfly Larva and fish that nest or burrow in bottom
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Submergent Plant Stage
•Organisms decay forming soil on bottom
• Small aquatic plants grow but do not reach surface
•Dragonfly and Mayfly larva as well as weedy bottom fish
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Emergent Plant Stage•Continues to fill with
decaying matter
• Larger plants grow through surface
•Cattails, bullrushes, water lilies
• Frogs, turtles, salamanders, a few fish
• Bacteria consume O2, less available to fish
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Marsh
•No large open areas of water
• Vegetation covers most of the land
•No truly aquatic fish can survive
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Swamp
•Marsh has become more dry, filled with more soil
• Trees start to grow like swamp maple and swamp willow
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Forest
• Swamp has filled in with soil and dried up
• Trees like maple and beech dominate
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•Mount St. Helen’s Regrowth Video Part 5
•Mount St. Helen’s Regrowth Video Part 6