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2.3 Flows of Energy and Matter (Why is sunlight lost (Reflection from…
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2.4 Biomes, zonation and succession
Biome
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Climate Controls
Precipitation
Needed for photosynthesis, transpiration, and support (turgidity)
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Temperature
Affects the rate of photosynthesis which determines the productivity of an ecosystem (NPP). The more productive a biome, the higher the NPP
Tropical rainforest
Stratified structure, highly layered
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Zonation
Arrangement or pattern of communities in bonds in response to change in some environmental factor over a distance
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Ecological Succession
A long-term change in the composition of a community or the process of a change over time in an ecosystem involving pioneer, intermediate and climax community
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Secondary
Succession occurring in places where a previous community has been destroyed. Faster than a primary succession due to the presence of soil and a seed bank. Takes place after a land clearance that does not involve the loss of the soil and seen and root stocks
Pioneer Communities
The first stage of an ecological succession; contains hardy species able to withstand difficult conditions
Climax Communities
Contains a more complex and stable community than earlier seral stages and is in equilibrium. Contains many more feedback mechanisms
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R-Species
Tend to inhabit unpredictable, rapidly changing environments (early seral stage)
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Produce many, small offsprings that mature rapidly
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K-Species
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Produce few, large offspring that mature slowly
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