Obj 11D Describe how events and processes that occur during ecological succession can change populations and species diversity What is ecological succession orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable clim ID: 272438
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ECOLOGICAL SUCCESSIONObj: 11D
Describe how events and processes that occur during ecological succession can change populations and species diversity
.Slide2
What is ecological succession?
orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is establishedSlide3
What differences do you see in these pictures?Slide4
TornadosHurricanesForest fires
Volcanoes
Floods
What disasters could affect the plant population?Slide5Slide6
Climax Community
The ideal end community in any given ecosystem
https://www.youtube.com/watch?v=iZA5yfrzLV8&feature=player_embeddedSlide7
Primary Succession
Occurs on bare rock or hardened lava on which no soil organisms exist
Beings with arrival of lichens, a pioneer speciesSlide8
Pioneer Species
Able to grow on barren rock
First organisms to grow during primary succession
Ex: lichens, mossesSlide9Slide10
Secondary Succession
Occurs after an event in which the ecosystem is damaged, but not destroyed.
Because soil remains, secondary succession is faster than primary successionSlide11
On Hwy 31 going to Kilgore…Slide12Slide13Slide14
How long is the time?Slide15
https://www.youtube.com/watch?feature=player_embedded&v=4RsMyVavT2QSlide16
Succession also in bodies of waterSlide17
large deep lakes
shallow ponds
grasslandSlide18
How does succession affect population size?
Forest fire or volcanic eruption will decrease population and diversity
If the soil is intact, over time, the populations will recover
Ex: insects deposit eggs in the soil & these eggs can survive and hatch after a fireSlide19Slide20
Animals that survived may move to other regions which reduced competition for other speciesCan lead to entirely new ecosystems if new herbivores move in where there were once none.
Eventually carnivores will move in to eat new herbivores.
How does succession affect population diversity?Slide21
How do population and species diversity change as succession progresses?
Population size and species diversity both increase during ecological succession
Over time, more species are able to survive and become establishedSlide22
Smaller producers are replaced by larger ones, such as small trees and shrubsAs insects increase, birds and other animals that eat insects arrive
Eventually a climax community will build againSlide23