Habitats, Environment and Survival

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Chapter 9: Unit 2 VCE Biology. Study of habitats, niches, communities, ecosystems and biomes, biotic and abiotic factors.

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Habitats, Environment and Survival

  1. 1. Unit 2: Chapter 9
  2. 2. <ul><li>A community is all the living organisms in a habitat. </li></ul><ul><li>Plant communities that have many layers of vegetation can support more species of birds than a plant community that has a simpler structure. </li></ul>
  3. 3. <ul><li>The system formed by a community of living organisms interacting with one another and their physical surroundings is an ecosystem. </li></ul><ul><li>Community + physical surroundings = ecosystem </li></ul>
  4. 4. <ul><li>An ecosystem can be a small or large unit of study. </li></ul><ul><li>Ecosystems are systems that are largely self-sustaining. </li></ul>
  5. 5. <ul><li>A habitat is a place where an organism lives. </li></ul><ul><li>The environment of an organism includes both the non-living (abiotic) and living (biotic) surroundings of an organism. </li></ul><ul><li>The environment provides an organism with it’s essential requirements. </li></ul>
  6. 6. <ul><li>The niche of a species is that part of the environment in which the species survives, reproduces and is likely to persist. </li></ul>
  7. 7. <ul><li>The physical environmental factors that affect the survival of organisms in fresh water include light, temperature, dissolved gases and nutrients. </li></ul>
  8. 8. <ul><li>Soils are made up of different sizes, including gravel, sand, silt and clay, together with mineral nutrients and humus. </li></ul><ul><li>Humus in soil holds particles together to form crumbs, which create pore spaces and help aeration. </li></ul>
  9. 9. <ul><li>Biomes are broad categories of ecological communities in the world, based on climate. </li></ul><ul><li>For example, in Australia we have the ‘desert and arid shrub lands’ and the ‘tropical rainforest’ biomes. </li></ul>
  10. 10. <ul><li>One of the best ways to study and ecosystem is to focus on a sample area. Samples can be located by using quadrats, transects and other techniques. </li></ul>

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