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Threats over biodiversity

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Academic year: 2021

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Habitat destruction not only cause species extinction but also cause decrease in population size which results in loss of genetic diversity.

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• The only known living members are being kept in captiviry (in zoo, botanical garden etc.) or they no longer live in their normal habitat –

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• Local extinction • Regional extinction • Ecological extinction

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How many species has been extinct because of habitat destruction is unknown

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Extinction probability of some species is higher than the

others. Overharvesting and the other factos increase the

vulnerability of species.

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The species having populations with small sizes and sparse distribution are more susceptible for extinction.

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Natural Extnction rates

99% of extinctions are related directly or indirectly with human activities.

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Extinction rates in islands

Because of the small size of the distribution areas, number of

populations and the number of individuals extinction rates are

high.

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