3.3 Threats to Biodiversity

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Human Activities Causing Species Extinctions

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6 Terms

1

Human Activities Causing Species Extinctions

habitat destruction, introduction of invasive species, pollution, overharvesting, hunting and climate change

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2

Factors for Red List

population size, degree of specialisation, distribution, reproductive potential and behaviour, geographic range and degree of fragmentation, quality of habitat, trophic level, probability of extinction

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3

extinct

no longer survives on Earth

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4

extinct in the wild

only survives in zoos or botanic gardens

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5

Threatened

umbrella term for Critically Endangered, Endangered and Vulnerable species

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6

Causes of Tropical Deforestation

Over-intensive shifting cultivation; Timber extraction; Over-collection of fuelwood for cooking and heating, and for making charcoal; Encroachment and clearance by landless peasant farmers; Clearance for pasture or crops, promoted by cheap land and government tax and financial incentives to encourage international investment - this includes Biofuels like Palm Oil and Sugar Cane

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