The numbers and types of species that live in them generally change through time. This is called ecological succession.
Dr. K. Rama Rao
Govt. Degree College
TEKKALI; Srikakulam Dt. A. P
Phone: 9010705687
Unit 5, Lesson 5.7- Ecological Successionjudan1970
Unit 5, Lesson 5.7- Ecological Succession
Lesson Outline:
Ecological Succession
1. Primary and Secondary Succession
2. Succession from Bare Rock
3. Succession from Disturbed Vegetation
The numbers and types of species that live in them generally change through time. This is called ecological succession.
Dr. K. Rama Rao
Govt. Degree College
TEKKALI; Srikakulam Dt. A. P
Phone: 9010705687
Unit 5, Lesson 5.7- Ecological Successionjudan1970
Unit 5, Lesson 5.7- Ecological Succession
Lesson Outline:
Ecological Succession
1. Primary and Secondary Succession
2. Succession from Bare Rock
3. Succession from Disturbed Vegetation
This presentation summarizes the key concepts of an ecological succession, citing clear examples. It gives readers an understanding of the stages involved in both primary and secondary succession.
This presentation summarizes the key concepts of an ecological succession, citing clear examples. It gives readers an understanding of the stages involved in both primary and secondary succession.
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The main causes of ecological succession include the biotic and climatic factors that can destroy the populations of an area. Wind, fire, soil erosion and natural disasters include the climatic factors. Ecological succession is important for the growth and development of an ecosystem. It initiates colonization of new areas and recolonization of the areas that had been destroyed due to certain biotic and climatic factors. Thus, the organisms can adapt to the changes and learn to survive in a changing environment.
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This presentation describes the plant succession, causes and its main types that is primary and secondary succession with examples in detail. It is related to the Ecology topic in Botany.
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2. ► Regrowth of a ForestRegrowth of a Forest
Succession: replacement of one type ofSuccession: replacement of one type of
communitycommunity by another at a single place overby another at a single place over
a period of timea period of time
3. Example: burned areas of YellowstoneExample: burned areas of Yellowstone
National Park started to regrow small,National Park started to regrow small,
green plants by the nextgreen plants by the next yearyear
4. ► Primary SuccessionPrimary Succession
Small organisms start toSmall organisms start to
grow in areas wheregrow in areas where
other organisms had notother organisms had not
previouslypreviously livedlived
No soil in this area, justNo soil in this area, just
bare rockbare rock
Over long period of time,Over long period of time,
organisms live and dieorganisms live and die
on rock, and rock ison rock, and rock is
slowly transformed intoslowly transformed into
soilsoil
5. FirstFirst organisms to live in an area are calledorganisms to live in an area are called pioneerpioneer
speciesspecies
Example: slowly retreating glacier exposes new rockExample: slowly retreating glacier exposes new rock
over many years there is enough soil for mosses toover many years there is enough soil for mosses to
growgrow soil deepens and mosses are replaced bysoil deepens and mosses are replaced by
grassesgrasses and wildflowersand wildflowers
6. ►Secondary SuccessionSecondary Succession
Sometimes, existing community is destroyed bySometimes, existing community is destroyed by
natural disastersnatural disasters, such as fire or flood, such as fire or flood
If soil is left intact, the original community mayIf soil is left intact, the original community may
regrow through a series of stages calledregrow through a series of stages called
secondarysecondary successionsuccession
Example: first year after farmer stops growingExample: first year after farmer stops growing
crops, weeds start to growcrops, weeds start to grow by second year,by second year,
new weed appearnew weed appear forests may form overforests may form over
many yearsmany years
7.
8. ►Mature Communities and BiodiversityMature Communities and Biodiversity
In early stages ofIn early stages of successionsuccession, only few, only few
species grow in an areaspecies grow in an area
These species grow quickly and make manyThese species grow quickly and make many
seedsseeds that scatter easilythat scatter easily
As community matures, it many beAs community matures, it many be
dominated by well-adapted,dominated by well-adapted, slow-growingslow-growing
climax speciesclimax species
Variety of species that are present in anVariety of species that are present in an
area is referred to as biodiversityarea is referred to as biodiversity
9. MatureMature
community maycommunity may
not always be anot always be a
forest; it simplyforest; it simply
has organismshas organisms
that are wellthat are well
adapted to liveadapted to live
together in thetogether in the
same area oversame area over
timetime
10. Cycles of MatterCycles of Matter
►Carbon CycleCarbon Cycle
Exchange ofExchange of carboncarbon between the environmentbetween the environment
and living thingsand living things
PhotosynthesisPhotosynthesis is the basis of carbon cycleis the basis of carbon cycle
Carbon returns to the environment when sugarCarbon returns to the environment when sugar
molecules are broken down to release energy—molecules are broken down to release energy—
process is calledprocess is called respirationrespiration
Carbon dioxideCarbon dioxide and water are released asand water are released as
byproducts of respirationbyproducts of respiration
11.
12. ► Nitrogen CycleNitrogen Cycle
OrganismsOrganisms
need nitrogenneed nitrogen
to buildto build
proteins andproteins and
DNA for newDNA for new
cellscells
AboutAbout 78%78% ofof
Earth’sEarth’s
atmosphere isatmosphere is
nitrogen gasnitrogen gas
13. Bacteria inBacteria in soilsoil changechange
nitrogen gas into formsnitrogen gas into forms
that plants can use—that plants can use—
process called nitrogenprocess called nitrogen
fixationfixation
When organisms dies,When organisms dies,
decomposersdecomposers breakbreak
down remains anddown remains and
release form of nitrogenrelease form of nitrogen
into soil that plants caninto soil that plants can
useuse
Certain types of bacteriaCertain types of bacteria
in soil convert nitrogenin soil convert nitrogen
into ainto a gasgas that returns tothat returns to
atmosphereatmosphere
14.
15. ►Water CycleWater Cycle
Movement of water between theMovement of water between the oceansoceans,,
atmosphere,atmosphere, landland, and living things, and living things
During evaporation, sun’s heat causes waterDuring evaporation, sun’s heat causes water
to change from liquid toto change from liquid to vaporvapor
During condensation, water vapor cools andDuring condensation, water vapor cools and
returns toreturns to liquidliquid statestate
Water that falls to oceans and land isWater that falls to oceans and land is
precipitationprecipitation
16. Groundwater isGroundwater is
precipitation thatprecipitation that
seeps into the groundseeps into the ground
and slowly flows backand slowly flows back
into soil, streams,into soil, streams,
rivers, and oceansrivers, and oceans
Plants release a largePlants release a large
amount of wateramount of water
vaporvapor transpirationtranspiration
17. Let’s Review!Let’s Review!
What is the precipitation that is storedWhat is the precipitation that is stored
between or within rocks?between or within rocks?
Ground waterGround water
What is the burning of a substance called?What is the burning of a substance called?
(Think of the carbon cycle picture with the(Think of the carbon cycle picture with the
factories…)factories…)
CombustionCombustion
18. What is the gradual development of aWhat is the gradual development of a
community over time called?community over time called?
SuccessionSuccession
What process is the basis of the carbonWhat process is the basis of the carbon
cycle?cycle?
PhotosynthesisPhotosynthesis