4105_Tutorial_6

4105_Tutorial_6 - What Kind of Value Does Biodiversity...

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What Kind of Value Does Biodiversity Have?
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Use Value – direct and indirect Nonuse Value – existence value and bequest value
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Use Value: Direct Use  – for example Extraction of timber from a forest Or nonconsumptive – appreciation of a landscape Indirect Use  – wetlands purify water (ecosystem services)
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Nonuse Values : Existence value – knowledge that it exists, even if you’ll never see it Bequest Value – knowing we will hand something down to future generations
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Habitat Degradation & Loss
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Data for Galapagos plants from van der Werff (1983) Vegetatio Species-Area Curves Area No. species A very consistent pattern of  species distribution
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Habitat Destruction, Loss, Degradation… At least 83% of the Earth’s land surface has been  transformed by human activities (Sanderson et al . 2002) About 60% of Earth’s ecosystems are considered  degraded  or unsustainably used (Millennium Ecosystem Assessment 2005) 98% of U.S. streams and rivers have been fragmented  (see next lecture) by dams (Benke 1990)
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This note was uploaded on 07/07/2011 for the course BIOL 4015 taught by Professor Prowell during the Summer '08 term at LSU.

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4105_Tutorial_6 - What Kind of Value Does Biodiversity...

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