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Perpetuation
Succession
Succession is the gradual process by which the
number and type of species in the community
changes over time du...
Primary Succession
Secondary succession
Changes occur in an environment which has been
exposed to damage or disaster. These changes can be
ve...
Characteristics of Succession
Communities
As the ecosystem matures there is more biomass,
but productivity decreases.
Ther...
Primary Succession
Coastal to Woodland
Biodiversity
Biodiversity refers to the variety of diverse forms
of life on Earth and is essential for communities
to flou...
Ecosystems are not static, they constantly
change and are shaped by the forces of
evolution.
Those that are most suited to...
However not all species have the capacity for
effective reproduction.
Species with a high reproductive effort, short life
...
Opportunistic species (r-selected) and those
which are more stable (k-selected) are
reproductive strategies at the extreme...
r - selected
Stable Populations
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Perpetuation

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Perpetuation

  1. 1. Perpetuation
  2. 2. Succession Succession is the gradual process by which the number and type of species in the community changes over time due to ecological disturbances. Primary succession Organisms establish themselves in a new environment e.g. sand dune or volcanic island. This can take considerable time to colonise the area as soil needs to develop and producers begin to populate the area.
  3. 3. Primary Succession
  4. 4. Secondary succession Changes occur in an environment which has been exposed to damage or disaster. These changes can be very quick and is typical of Australian ecosystems which have to deal with bushfires, land clearing and deforestation. This is because there is more soil and a greater mix of species of plants and animals.
  5. 5. Characteristics of Succession Communities As the ecosystem matures there is more biomass, but productivity decreases. There are usually more species in mature ecosystems. As the ecosystem matures the number of heterotrophic species tends to increase more than the number of autotrophic species. Mature ecosystems are efficient at recycling nutrients. Mature ecosystems have organism that tend to be more specialized.
  6. 6. Primary Succession Coastal to Woodland
  7. 7. Biodiversity Biodiversity refers to the variety of diverse forms of life on Earth and is essential for communities to flourish and survive. It can be seen: 1.In the genetic makeup of individuals in a population 2. Between one species and another 3. Between the various ecosystems
  8. 8. Ecosystems are not static, they constantly change and are shaped by the forces of evolution. Those that are most suited to conditions are likely to survive and pass on their genes to the next generation. E.g. Natural Selection.
  9. 9. However not all species have the capacity for effective reproduction. Species with a high reproductive effort, short life and many offspring are more common in early succession (r-selected). Species with a low reproductive effort, long life and few offspring are more common in stable environments (k-selected).
  10. 10. Opportunistic species (r-selected) and those which are more stable (k-selected) are reproductive strategies at the extremes of the reproductive continuum. Most organisms fall in between these two extremes. Image from www.trunity.net
  11. 11. r - selected
  12. 12. Stable Populations

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