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BIOLOGY UNIT 6 - ECOSYSTEMS (Abiotic Factors - non-living tree…
BIOLOGY UNIT 6 - ECOSYSTEMS 
Practical
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Biodiversity
Human actions including waste production, deforestation & global warming are reducing biodiversity
Population of the world currently rising - over 7 billion people due to modern medicine & farming methods
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= variety of different species or organisms on Earth, or within an ecosystem
Indicator species - living thing that marks a treat of environment/habitat e.g.. moths indicate air quality with colour of wings
Competition
Resources
Plants need light, space, water & mineral ions (nutrients) from the soil
Animals need space, food, water & mates
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Interdependence
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Stable communities - all the species & environmental factors in balance so population sizes roughly constant e.g.. tropical rainforests & ancient oak woodlands
Interdependence - in community each species depends on others for food, shelter, pollination & seed dispersal
Abiotic Factors - non-living
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Biotic Factors - living
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Adaptations
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Food Web - Diagram of What Eats What
Food Chain- What's Eaten by What
Populations of prey & predators go up & down in cycles e.g.. more grass means more rabbits = more foxes = less rabbits = less foxes
Producers eaten by primary consumers, which are eaten by secondary consumers, eaten by tertiary consumers e.g.. dandelions -> rabbits -> fox
Producers - produce own food using energy from sun e.g.. green plants or algae which make glucose by photosynthesis
Deforestation & Land Use
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We use land for building, quarrying, farming & dumping waste
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Waste Management
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Water
Chemicals used on land (fertilisers, pesticides) can be washed into water
Sewage & toxic chemicals from industry can pollute lakes, rivers & oceans, affecting plants & animals
Global Warming
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Carbon dioxide & methane (greenhouse gases) trap energy from the sun affecting the temperature of the Earth
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Maintaining Local & Global Biodiversity
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