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Ecological Succession PowerPoint PPT Presentation


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Ecological Succession. Primary and Secondary. What is it?. The normal GRADUAL (takes a long time) changes that occur in the types of species that live in an area. Ecological Succession.

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Ecological Succession

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Ecological succession l.jpg

Ecological Succession

Primary and Secondary


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What is it?

The normal GRADUAL

(takes a long time)

changes that occur in the types of species that live in an area.


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Ecological Succession

  • There are two main types of succession, primary and secondary.Primary succession is the series of changes that take place when there is no soil present. For example, after a volcano or destroyed coral reef. Secondary succession is the series of changes that take place when there is soil present. For example, after a fire, hurricane, flood, destruction by man, or tornado.


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Which one do you think takes longer?

Answer

Primary Succession

Why?

The rocks need to break down to make the soil before new species will grow


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What Species Comes first?

Pioneer Species

These are the FIRST species to grow

They can be different depending upon the area. Example: is it a forest, a pond, a wetlands….?

AND- is it primary or secondary succession?


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What makes the difference between primary and secondary succession?

The key is whether there is soil already present or does the soil need to be made from broken down rock


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Examples of Pioneer SpeciesPioneer- FIRST species to grow

  • Mosses


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Pioneer Species- FIRST

Lichens-do not need soil to survive

They can survive drought, extreme heat and cold, and other harsh conditions and start the soil building process.


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Lichens produce a weak acid that eats away at the rock and breaks it down into soil


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Pioneer Species- FIRST

Algae- many types


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Second Stage

Second plants to become established after the disturbance (taller grasses, small shrubs).

Shrubs


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Third Stage- bushes

  • Third species to become established


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Fourth Stage- usually small trees; depends on ecosystem

  • Fourth species to become established


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Final Stage-Climax Community

  • Last species to appear; some say it isn’t really finished growing.


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Barren patch of land- just to see what can happen to a bare space!


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Same patch of land two years later


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Pond Succession- Primary or secondary?

  • Put the pictures in order

B, C, A, then D.


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Disturbance- Forest Fire


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  • Within 2 weeks, small grasses and other plants will grow- soil is already present


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  • Second stage


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  • Third stage


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Full succession takes a VERY long time- could be 100’s of years.

  • Still second stage/some small trees appearing


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Succession in Action

  • RestoringEarth - Educating People


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When will the animal species return to the ecosystem?

  • You must consider what is needed for them to be able to live in the environment.

  • Animal species will not return until their needs can be met.

  • What do they need? A habitat that will provide them with sufficient food, water, a hiding place, etc.


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Choose your favorite disaster – how will succession occur?

  • A disturbance:

  • a forest fire

  • a volcano

  • a flood,

  • dried up pond

  • hurricane

  • tornado

  • abandoned ball field or tennis court

  • coral dying for lack of water


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