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Year 7 Ecosystems - For additional resources visit:

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  1. 1. Ecosystems Sarah Jones
  2. 2. Aquatic Ecosystems
  3. 3. Saltwater - open seas, estuaries and saltwater lakes. Approximately 65% of the Earth's surface is covered by oceans. Tides, currents, waves and wind continuously move the water in the surface layers.
  4. 4. Freshwater - include still water such as lakes and ponds, swamps, and moving water such as springs creeks and rivers.
  5. 5. Terrestrial Ecosystems
  6. 6. Terrestrial environments vary as a result of topography, climate, availability of water, and human activity. Examples: rainforest, open forests, mountain tops, deserts, grasslands, farms and cities.
  7. 7. Population A group of living organisms of the same kind living in the same place at the same time.
  8. 8. Community Organisms living together in a particular place.
  9. 9. Habitat The habitat of an organism is the place where it lives. These can vary in size e.g. desert, under tree bark, within the digestive system of another organism.
  10. 10. Ecosystems will fail if they do not remain in balance. No community can carry more organisms than its food, water and shelter can accommodate. Food and territory are often balanced by natural phenomena such as fire, disease, and the number of predators.
  11. 11. Abiotic Factors of Ecosystems
  12. 12. Light Wind Rainfall Temperature (daily and seasonal) Topography (altitude and depth) Tides, currents and waves Water (salinity, pH and availability) Substrate (surface on which an organism grows or is attached) Space and shelter Oxygen
  13. 13. Biotic Factors of Ecosystems
  14. 14. Availability of food Number of competitors Availability of mates Number of predators Disease causing organisms Limiting factors - anything that makes it difficult for a species to live and grow, or reproduce in its environment.