Bio-indicators
A bio-indicator or biological
indicator is any species or group of species whose function or status reveals
the qualitative status of the environment. Biological indicators are used to
document and understand changes in earth’s living systems especially changes
caused by the activities of an expanding human population. Bio-indicators of
soil health give us information about soil structure, development, nutrient
storage and biological activities.
Biological indicator characterises
the state of an ecosystem and brings its modifications. Lichen is a natural bio-indicator of climate change and air
pollution effect. It is a combination of an alga and a fungus which live
together in symbiotic association. Lichen
is a sensitive environmental parameter like temperature, humidity, wind and air
pollutants. It gives information about changes in climate, air quality and biological
process.
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