ECOLOGY, ecosystems, biotic and abiotic factors, organism interactions, interdependence, parasitic, mutual relationships, interdependence, environmental changes, effects on populations

Doc Brown's biology exam revision study notes

 This page will help you answer questions such as ...  What is an ecosystem?  What are biotic factors?  What are abiotic factors?  Why do populations of species rise and fall?  How do environmental changes affect communities?

Sub-index for this page on ecosystems

(1) Introduction: Ecology and ecosystems: technical terms and definitions explained

(2) Competition for resources

(3) Effects of environmental changes on communities - introduction and abiotic factors

(4) Methods of surveying-monitoring pollution - measuring abiotic factors

(5) Changes in communities - biotic factors and populations

(6) Examples of how a population might change in size when a biotic/abiotic factor changes

(7) More examples of interactions - interdependence - mutualism and parasitism

See also Ecological surveying - using quadrats and transects and two other important sections

Food chains and webs, trophic levels, pyramids of biomass & numbers, transfer efficiency

Biodiversity, land management, waste management, maintaining ecosystems - conservation

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 Doc Brown's Biology exam study revision notes

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