Community Structure Zoljargal

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Community Structure Zoljargal

  1. 1. Zoljargal Jargalsaikhan
  2. 2. <ul><li>Community is a group of populations interacting and inhabiting a certain area. It is a complex mixture of different populations that exist together </li></ul><ul><li>Community ecology is the study of the distribution, abundance, demography, and interactions between populations of coexisting species. </li></ul>
  3. 3. <ul><li>The structure of a community refers to its: </li></ul><ul><li>Diversity – the number of different species </li></ul><ul><li>Populations – how many of each species there are </li></ul><ul><li>Appearance – size and distribution of species </li></ul><ul><li>Interactions – what jobs the species play within the community and how they interact with each other </li></ul>
  4. 4. <ul><li>NATIVE SPECIES are those species that typically live and thrive in a particular ecosystem and have been present there for a long period of time. </li></ul><ul><li>NON-NATIVE SPECIES are species which are either deliberately or accidentally introduced into an ecosystem </li></ul><ul><li>INDICATOR SPECIES are species which are particularly sensitive to environmental change and so serve as signs of early warning of damage to a community </li></ul><ul><li>KEYSTONE SPECIES are species that play a more important role in an ecosystem than would be suggested by their population </li></ul>
  5. 5. <ul><li>Ecological Succession </li></ul><ul><li>It refers to more or less predictable and orderly changes in the composition or structure of an ecological community </li></ul>
  6. 6. <ul><li>There are two main types of succession </li></ul><ul><li>Primary Succession </li></ul><ul><li>It occurs in essentially lifeless areas </li></ul><ul><li>Secondary Succession </li></ul><ul><li>It occurs in areas where a community that previously existed has been removed </li></ul>
  7. 7. <ul><li>A transitional zone between two communities containing the characteristic species of each </li></ul><ul><li>Example – Wetlands </li></ul>
  8. 8. <ul><li>The edge effect is a term used to describe the various consequences on vegetative communities. These edges can be natural or human induced. </li></ul>
  9. 9. <ul><li>The ecological niche involves both the place where an organism lives and the roles that an organism does in its habitat </li></ul>

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