what is bio-indicator? How does it help human beings?
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ARTICLE Bioindicators EXPLORE
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A bioindicator is a living organism that gives us an idea of the health of an ecosystem. Some organisms are very sensitive to pollution in their environment, so if pollutants are present, the organism may change its morphologyphysiology or behaviour, or it could even die.
Worms
Changes in the functioning of the nervous systems of worms are used to measure levels of soil pollution. The numbers of earthworms in the soil can also be used to indicate the health of the soil.
One example of a bioindicator is lichens. These plants, which live on surfaces such as trees or rocks or soil, are very sensitive to toxins in the air. This is because they obtain their nutrients mostly from the air. We can tell our forests have clean air by the amount and types of lichens on the trees. Different species of lichen have different levels of susceptibility to air pollution, so we can also get an idea of the level of pollution by observing which species are present.
Nature of science
Living organisms can often be used to indirectly measure levels of chemicals in their environments. Population numbers can also be tracked over time to notice changes that may be a result of changes in the environment.
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