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ECOLOGICAL SUCCESSION

ECOLOGICAL SUCCESSION. Have you ever observed a vacant lot or an untended garden over time?. Think about 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?.

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ECOLOGICAL SUCCESSION

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  1. ECOLOGICAL SUCCESSION

  2. Have youeverobserved a vacant lot or an untendedgarden over time? • Think about the changes yousaw. • What plants were first to arrive on the scene? • Will the area look likeit originally did? • How long willittake to change?

  3. What do we call a communitychangingthrough time? • Ecological Succession • Natural, gradual changes in the types of species that live in an area; The gradual replacement of one plant community by another through natural processes over time 2 Types: • Primary • Secondary

  4. Whatorganismscould survive on barren rock? • HINT: Tiny, mostlymicroscopic, and theysecrete enzymes to break down rock • These are Pioneer Species– first organisms to colonize an area and occursduringPrimary Succession. Bacteria, fungus, and lichens (algae and fungus)

  5. The rock breaks down to SOIL! • Big changes cannowtake place because the presence of soil has opened up a new world.

  6. Succession occursbecause of COMPETITION • Differentspecies or organisms living in the same habitat utilize the samelimitedresources (food, space, water, light, oxygen, and minerals). • The organism better adapted for the environment will take over the area.

  7. Primary Succession • Barren rock-Starts with the arrival of living things such as lichens that do not need soil to survive.

  8. 2.Soil formation- • Soil starts to form as lichens and the forces of weather and erosion help break down rocks into smaller pieces. • When lichens die, they decompose, adding small amounts of organic matter to the rock to make soil. • Simple plants like mosses and ferns can grow in the new soil . • The simple plants die, adding more organic material.

  9. Grasses and small plants growfromseedsbrought in by animals or wind. (The soil layer thickens, and grasses, wildflowers, and other plants begin to take over.) 4. Lichens die becausetheydon’treceiveenough light. 5. Grass community survives for manygenerations, makessoildeeper and more fertile.

  10. Primary Succession continued • Non-woody plants (shrubs) withdeeprootscrowd out grasses. • Grasses and shrubs are not stable becausethey are not diverse

  11. 8. Pine treeswithshallowrootsinvade and crowd out shrubs 9. Broad leaftreestakeroot and replace pine trees • Insects, small birds, and mammals have begun to move in • What was once bare rock now supports a variety of life ! CLIMAX COMMUNITY – a communitythatdoes not undergofurther succession (stable and diverse)

  12. Primary Succesion

  13. Secondary Succession • Community has been cleared by a disturbance that does not destroy the soil • Fires • Storms • Human Activity • Same series as primary succession, but it goes quicker because you don’t need to form soil

  14. Secondary Succession • Yellowstone Fire Click this link!!!!!!!!!!

  15. Secondary Succession Primary Succession Fill in using the notes you just took!  Fill in using the notes you just took! 

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