BIO 126 Lecture Notes - Lecture 5: Habitat Destruction, Peregrine Falcon, Keystone Species
21 Mar 2016
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Document Summary
Conservation biology protects biological diversity at all levels. Humans depend on plants, animals, and microorganisms for a wide range of food, medicine, and industrial products. Preserve essential services of ecosystems, such as clean air and water. Ethical responsibility to protect what are our only known companions in the universe. World"s ecosystems worth more than trillion a year. Species-rich communities are more stable than those with fewer species n o i t c n u f m e t s y s o c. Species diversity (a) diversity-stability hypothesis: redundancy hypothesis. Most species are redundant, they take up space but do not add to diversity n o i t c n u f m e t s y s o c. Species diversity (b) redundancy hypothesis: keystone hypothesis. Ecosystem function plummets as soon as biodiversity declines from its natural levels n o i t c n u f m e t s y s o c.
