Why is biodiversity important?

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Presentation transcript:

Why is biodiversity important? © 2016 Paul Billiet ODWS

Why is biodiversity important? Ecological Economic Aesthetic Ethical Glasswing Butterfly (Greta oto) © 2016 Paul Billiet ODWS

Tropical rain forest & biodiversity Tropical rainforests = about 7% of the Earth’s land surface (about 9 million km2) They contain about 50% of the known species They are being cleared for timber or agriculture 76 000 km2 lost per year At this rate they will all be cleared in 100 years. Biological Conservatiuon I Spellerberg & S Hardes 1992 CUP © 2016 Paul Billiet ODWS

Ecological reasons High biodiversity = a healthy ecosystem Ecosystems under stress from over exploitation or pollution, will show low diversity Once diversity is lost from an ecosystem it cannot recover easily Species need to migrate back in from neighbouring ecosystems Extinction is forever. © 2016 Paul Billiet ODWS

Aesthetic reasons People like diverse habitats The money people are prepared to spend on it suggests this Animals and plants give us pleasure. US Fisheries & Wildlife Services © 2016 Paul Billiet ODWS

Ethical reasons Destroying biodiversity is denying a renewable resource to future generations It is denying a source of pleasure to future generations When a species becomes extinct a unique combination of genetic information is lost forever One thinking, reasoning species (Homo sapiens) does not have the moral right to exterminate other species. US Geological Survey © 2016 Paul Billiet ODWS