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Saturday, 5 January 2019

Population Studies and Abiotic factors

 • In population studies of a habitat, we investigate the types of organisms present, the dominant species and the characteristic features of each population. Population features include size, density, frequency, percentage cover and distribution.

 • Population in a habitat are studied by sampling. Common sampling techniques include the quadrat and transect methods.

 • Collected plants are identified and preserved. Such a collection forms a herbarium. Collected animals may be kept alive in aquaria (aquatic forms) and in vivaria (terrestrial forms).

 • Abiotic factors determine the type of biotic community found in a habitat.

 • Abiotic factors common to all habitats include temperature, rainfall , lights, hydrogen ion concentration wind and pressure. Salinity , density, turbidity, water flow, waves, dissolved gases and substratum operate only in aquatic habitats. Relative humidity, land surfaces and soil (edaphic) factors operate in terrestrial habitats.

 • Various methods are available for studying abiotic factors.  
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