Abiotic factors = the physcial or non-living aspects to an ecosystem. These include:
• Climatic factors, such as temperature; water/humidity; light/shade;current (wind/water), frost
• Edaphic (soil) factors, such as pH; mineral supply; soil texture; soil moisture.
• Topographic factors, such as altitude, slope, aspect .
• Human factors, such as pollution.
• Catastrophes, such as floods and fire .
Abiotic factors can vary within a habitat, giving microclimates in microhabitats.
Abiotic factors tend to be density-independent factors, i.e. the size of the effect is independent of thesize of the population. For example a low light intensity will limit plant growth regardless of the number of plants present.
Many abiotic factors vary with the seasons, and this can cause a periodic oscillation in the population size.
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