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Biodiversity Sydney Morning Herald © 2016 Paul Billiet ODWS.

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Presentation on theme: "Biodiversity Sydney Morning Herald © 2016 Paul Billiet ODWS."— Presentation transcript:

1 Biodiversity Sydney Morning Herald © 2016 Paul Billiet ODWS

2 What is biodiversity? The total number of species living in an ecosystem Recently attention has been focussed on global biodiversity and the extinction of species due to human activities. © 2016 Paul Billiet ODWS

3 How many species are there?
At present about 1.5 million have been named That is not certain as there is no common database Estimates for the total number of species range from 5 to 30 million. Biological Conservatiuon I Spellerberg & S Hardes 1992 CUP © 2016 Paul Billiet ODWS

4 Why can’t we know the exact number of species?
We have not explored every part of the biosphere yet Most species are less than 1mm long so they are easily overlooked Apart from the popular taxonomic groups like birds and mammals there are not enough experts to identify the more obscure and “esoteric” groups Species become extinct before they have been discovered. Biological Conservatiuon I Spellerberg & S Hardes 1992 CUP © 2016 Paul Billiet ODWS

5 Extinction is forever Species have become extinct in the past
What is new is the rate at which it is happening now Species disappear at a regular rate Today the rate is 10 to 100 times greater. Biological Conservatiuon I Spellerberg & S Hardes 1992 CUP © 2016 Paul Billiet ODWS

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