1.5 Life Processes in the Biosphere

Comprehensive notes on Unit 1 - The Living Environment, Chapter 5 - Life Processes in the Biosphere.

Covers topics such as Adaptation - and the factors affecting it; Ecological Succession; and Natural Population Economies - and the patterns we see.

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  • Created by: Joe
  • Created on: 30-12-11 11:54

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1.5. Life Processes in the Biosphere
o Populations are adapted to a range of tolerance; large gene pool = easier to adapt to changes.
Controls distribution of species. Adaptation to extreme conditions eliminates competition, but may limit habitat.
Low = no enzymes, Hot =…

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e.g. forest elephants create waterhole clearing (bais), gorillas, deer, antelope depend on these.
Grouping Organisms (taxonomy) & Environments
o TAXONOMY ­ study of grouping organism: groups are called taxons; e.g. genus ­ group of closely related species
o SPECIES = A group of very similar organisms which naturally form a…

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Diversity & Ecological Stability
o Stable environments = areas with higher diversity & less extreme abiotic factors.
o SIMPSON'S DIVERSITY INDEX is commonly used ­ you have to learn this!!

The higher the value, the higher the biodiversity

o We estimate that there are many species still undiscovered (2 million…

Page 5

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Carrying capacity: regulates a population because the Density Dependant Factors become stronger if a
population exceeds the CC or weaker when a population feels below the CC ­ resulting in stability.
Predator:Prey Relationships: at times when prey is plentiful, predator numbers will increase after a lag time;
prey numbers will…


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