Lect+27+Biodiversity+Theory+and+Trends+_UCB+Environmental+Science+10_

Lect+27+Biodiversity+Theory+and+Trends+_UCB+Environmental+Science+10_

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11 Biodiversity Theory Adam B. Smith | University of California, Berkeley Environmental Science 10 | April 1, 2011
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22 1. Loss and knowledge of diversity 2. Paradox of competition •. Self-inhibition •. Niche partitioning •. Trade-offs •. Dominance/tolerance? •. Disturbance Biodiversity Theory: Outline 3. “Correlates” of diversity •. Diversity diversity •. Evolutionary dynamics •. Productivity 4. Diversity-stability debate
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species loss illusions responses to climate change range shifts grinnell project Adam B. Smith | 3 Marine Turtles 6 in 7 Cyca ds 3 in 4 Conifer s 35% Mammals 1 in 4 Primate s 1 in 2 IUCN 2008, 2006 WWF 2008 Bird s 12% Coral s 28% Amphibian s 33% Current rates of species endangerment
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44 Knowledge of global diversity 10-30 million species total worldwide, but most are unknown
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55 1. Loss and knowledge of diversity 2. Paradox of competition •. Self-inhibition •. Niche partitioning •. Dominance/tolerance? •. Trade-offs •. Disturbance Biodiversity Theory: Outline 3. “Correlates” of diversity •. Diversity diversity •. Evolutionary dynamics •. Productivity 4. Diversity-stability debate
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66 Paradox of competition: Competitive exclusion GF Gause’s competitive exclusion principle: No two species can coexist indefinitely if they use exactly the same resources. Paramecium aurelia vs. Paramecium caudatum . vs. Paramecium aurelia wins. Gause 1934
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77 Paradox of competition Paradox of competition: Why do we have so many species given that species often require the same resources? Some answers: 1. Self-inhibition 2. Niche partitioning 3. Trade-offs 4. Dominance/tolerance? 5. Disturbance Colorado sub-alpine meadow
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88 Paradox of competition Paradox of competition: Why do we have so many species given that species often require the same resources? Some answers: 1. Self-inhibition 2. Niche partitioning 3. Trade-offs 4. Dominance/tolerance? 5. Disturbance Species can coexist if they each inhibit themselves more than they inhibit the growth of the other species intra specific competition > inter specific competition for both species
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99 Paradox of competition Paradox of competition: Why do we have so many species given that species often require the same resources? Some answers: 1. Self-inhibition 2. Niche partitioning 3. Trade-offs 4. Dominance/tolerance? 5. Disturbance Spatial clustering causes species to compete with themselves more than others. Colorado sub-alpine meadow
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1010
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1111 Paradox of competition Paradox of competition: Why do we have so many species given that species often require the same resources?
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This note was uploaded on 08/01/2011 for the course PSYC 132 taught by Professor Phillip during the Spring '11 term at Arkansas.

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Lect+27+Biodiversity+Theory+and+Trends+_UCB+Environmental+Science+10_

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