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8.2 COLONISATION ANDSUCCESSION IN AN ECOSYSTEM            A community of organisms which interact         Ecosystem       ...
SpeciesA group of organisms that:  look alike and have similar characteristics  share the same roles in an ecosystem  capa...
populationA group of organisms of the same speciesliving in the same habitat at the same time
Community- A several populations of different species living in the same habitat of an ecosystem-Interpendent and interact...
NICHE -A niche of an organism is its role in the  ecosystem -Niche of a population:   ranges of temperatures at which it l...
BARE GROUND• An environment of bare rocks and sand left  behind by a forest fire is not suitable for most  organisms.• Aft...
PIONEER SPECIES• The first colonizers• Special adaptations is enable to survive on dry  and nutrient-poor soil• Hardy plan...
Successor species• Modify the environment, eventually creating  conditions which are less favorable to themselves• Grow bi...
Dominant species• Can grow faster and so they out-compete the  pioneers which grow at a slower rate• Turn modify the envir...
• Ecological success leads to a relatively stable  community which is in equilibrium with its  environment• Example: tropi...
Colonisation• A process whereby a species invades and  occupies a newly formed area where no  life has existed previously
Succession• The gradual process through which one  community changes its environment so that it  is replaced by another co...
Biology - Colonisation and Succession
Biology - Colonisation and Succession
Biology - Colonisation and Succession
Biology - Colonisation and Succession
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Biology - Colonisation and Succession

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hopefully, this could help you to understand much better in this chapter..... biology is fun!!

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Biology - Colonisation and Succession

  1. 1. 8.2 COLONISATION ANDSUCCESSION IN AN ECOSYSTEM A community of organisms which interact Ecosystem with their non-living environment and function as a unit Biotic components are well balanced with Dynamic Ecosystem one another and with the abiotic components - Natural environment where organisms live Habitat -Provides basic resources og life such as food, shelter, living space, nesting sites and mates
  2. 2. SpeciesA group of organisms that: look alike and have similar characteristics share the same roles in an ecosystem capable of interbreeding to produce fertile offspring
  3. 3. populationA group of organisms of the same speciesliving in the same habitat at the same time
  4. 4. Community- A several populations of different species living in the same habitat of an ecosystem-Interpendent and interact with one another in order to survive
  5. 5. NICHE -A niche of an organism is its role in the ecosystem -Niche of a population: ranges of temperatures at which it lives the type of food it eats the space it occupies -animals that undergo metamorphosis in their cycle occupy different niches. A tadpole lives A frog lives mainlyentirely in water on the land
  6. 6. BARE GROUND• An environment of bare rocks and sand left behind by a forest fire is not suitable for most organisms.• After the ground cools down, water re-enters the environment. When water, air, nutrients and sunlight are available, spores and seeds of certain plants start to germinate and grow.
  7. 7. PIONEER SPECIES• The first colonizers• Special adaptations is enable to survive on dry and nutrient-poor soil• Hardy plants which usually have dense root system to bind the sand particles and hold water and humus• Short life cycle• When die, they remains add to the humus content of soil
  8. 8. Successor species• Modify the environment, eventually creating conditions which are less favorable to themselves• Grow bigger than pioneer species, thus reducing the amount of sunlight that reaches them and gradually replacing them• Have small wind-dispensable seeds which are able to spread and grow rapidly• Change the structure and quality of the soil, making it more conductive for larger plants to grow
  9. 9. Dominant species• Can grow faster and so they out-compete the pioneers which grow at a slower rate• Turn modify the environment which allows larger trees to grow• The larger trees out-compete the shrubs, which are replaced by forest-floor species which require low light intensit (succession)
  10. 10. • Ecological success leads to a relatively stable community which is in equilibrium with its environment• Example: tropical rainforest in Malaysia• A stable community that undergoes little or no change in its species composition
  11. 11. Colonisation• A process whereby a species invades and occupies a newly formed area where no life has existed previously
  12. 12. Succession• The gradual process through which one community changes its environment so that it is replaced by another community

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