Term
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Definition
| Term used to describe changes of an ecosystem overtime in the species that occupy a particular area |
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Term
FIRST STAGE OF SUCCESSION |
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Definition
| Colonisation; by pioneer species. |
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Term
WHAT ARE PIONEER SPECIES? |
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Definition
They produce lots of wind dispersed seeds/spores to reach isolated conditions easily
Rapid germination of seeds - no dormancy
Ability to photosynthesis - not dependent on animals
Fix nitrogen from atmosphere because there is little nutrients in the soil
Tolerant to extreme conditions |
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Term
WHAT HAPPENS IN SUCESSION? |
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Definition
| At each stage, the soil becomes more nourished so more species can survive. The new species outcompete the old so a new community is formed |
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Term
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Definition
| Weathering of rock produces sand/soil. As plants decompose, they release nutrients to support community |
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Term
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Definition
| Plants that shed all leaves together in one season |
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Term
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Definition
Final stage of succession
stable state
balanced equilibrium
animals and plants |
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Term
HOW DO ANIMALS GET INTRODUCED? |
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Definition
| The plants provide food for them and habitats |
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Term
WITHIN CLIMAX COMMUNITIES |
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Definition
| Dominant plant and animal species |
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Term
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Definition
Non living environment becomes less hostile
greater number and variety of habitats
increased biodiversity
more complex food webs
increased biomass |
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Term
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Definition
Due to land clearing - forest fires/agriculture
More rapid - spores/seeds alive in soil
Doesn't begin with pioneer species
begins with species from other succesional stages |
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Term
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Definition
Primary colonisers
Pioneer species
Hostile conditions
Low biodiversity |
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Term
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Definition
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Term
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Definition
| Secondary colonisers - outcompete primary, soil more hospitable more species |
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Term
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Definition
| Tertiary colonisers - outcompete secondary, more species, more diverse more hospitable |
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Term
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Definition
Scrubland
small trees and shrubs |
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Term
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Definition
Climax community
Equilibrium |
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Term
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Definition
| Management of the earths natural resources so maximum use can be made from them in the future |
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Term
MAIN REASONS FOR CONSERVATION |
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Definition
Ethics - other species should co exist with us
economic - big gene pool - millions of subatances with possible value
cultural - inspiration to artists, writers, poets
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Term
BAD POINTS OF CLIMAX COMMUNITIES |
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Definition
Many species that existed before are no longer present in them
habitats have disappeared
out competed
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Term
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Definition
| Manage succesion that prevents the change to the next stage |
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