4-24 - Population of a few individuals cannot...

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Unformatted text preview: 4-24-09Population of a few individuals cannot surviveExtinction vortexAttwater prairie chicken-As population declined, genetic diversity declined.-Individuals brought from other populations increased reproduction and population.Can a number of individuals be set?-scientists are reluctant to set a specific number-policymakers want information from scientistsWhat criteria do we use to set limits?-money-land-developmentWho benefits?-ecosystem benefits; seed dispersal, pollinators nutrient recycling-these functions cannot practically or economically be carried out by humansCannot replace species with technologyHow many animals do we want to save?-complex interactions of science, economics, and ethics (cultural, aesthetic, spiritual)-most of human history includes critical and [profound interactions with other organisms. That is now diminished or gone.-if a number is set, it stays static as conditions changeSanderson’s proposed solution:Instead of a single number, a number for each level can be determined.Instead of a single number, a number for each level can be determined....
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This note was uploaded on 06/16/2009 for the course BIO 53665 taught by Professor Iverson during the Spring '07 term at University of Texas.

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4-24 - Population of a few individuals cannot...

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