Have you ever observed a vacant lot or an untended garden over time Describe the changes you saw What plants were first to arrive on the scene Will the area look ID: 435226
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Slide1
ECOLOGICAL SUCCESSIONSlide2
Have
you ever observed a vacant lot or an untended garden over time?
Describe the changes you saw.What plants were first to arrive on the scene?Will the area look like it originally did?How long will it take to change?Slide3
What
do we call a community changing through
time?Ecological SuccessionPrimarySecondarySlide4
What
organisms could survive on barren rock?HINT: Tiny, mostly microscopic, and they secrete enzymes to break down rock
These are Pioneer Species – first organisms to colonize an area
Bacteria, fungus, and lichens (algae and fungus)Slide5
The rock breaks down to SOIL!
Big changes can now take place because the presence of soil has opened up a new world.Slide6
Succession
occurs because of COMPETITIONDifferent species or organisms living in the same habitat utilize the same limited resources (food, space, water, light, oxygen, and minerals).The organism better adapted for the environment will take over the area.Slide7
Primary
SuccessionBarren rockSoil formationGrasses and small plants grow from seeds brought in by animals or windLichens die because they don’t receive enough light.Grass community survives for many generations, makes soil deeper and more fertile.Slide8
Primary
Succession continuedNon-woody plants (shrubs) with deep roots crowd out grassesGrasses and shrubs are not stable because they are not diversePine trees with shallow roots invade and crowd out shrubsBroad leaf trees
take root and replace pine treesCLIMAX COMMUNITY – a community that does not undergo further succession (stable and diverse)Slide9
Primary
SuccesionSlide10
Secondary Succession
Community has been cleared by a disturbance that does not destroy the soilFiresStormsHuman ActivitySame series as primary succession, but it goes quicker because you don’t need to form soilSlide11
Secondary Succession
Yellowstone FireSlide12
Primary Succession
Secondary SuccessionSlide13
Ecological Succession Notes
1. Ecological succession - _______________________________________________Primary SuccessionSecondary Succession2. Pioneer species - ___________________________________________________Examples include:_________________________________________________________3. Bacteria, fungus, & lichens break down rocks to make ______.4. Succession occurs because of ____________. 5. The organism _________ adapted for the environment will take over the area. Slide14
Primary
Succession:____________________Soil formationGrasses and small plants grow from seeds brought in by ___________________________________________ because they don’t receive enough light.Grass community survives for many generations, makes soil deeper and more fertile.Non-woody plants (shrubs) with deep roots crowd out grassesGrasses and shrubs
are _________________ because they are not diversePine trees with shallow roots invade and ____________________________________Broad leaf trees _________________ and replace pine
trees_____________________________– a community that does not undergo
further
succession (stable and diverse)Slide15
Secondary
Succession:Community has been cleared by a disturbance that ____________________________________________________Storms_________________Same series as primary succession, but it goes _____________ because you don’t need to form soilSlide16