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CONTENTS Preface Introduction 1. Species: Reality and Concepts The Reality of Species Species Concepts Why Are There Species? 2. Studying Speciation The Problem of Speciation Identifying and Measuring Reproductive Isolation Comparative Studies of Isolating Barriers 3. Allopatric and Parapatric Speciation Allopatric Speciation Parapatric Speciation Conclusions 4. Sympatric Speciation Theory Experimental Evidence Evidence from Nature Conclusions 5. Ecological Isolation Habitat Isolation Pollinator (Floral) Isolation Temporal ("Allochronic") Isolation Conclusions 6. Behavioral and Nonecological Isolation Mating System "Isolation" Behavioral Isolation Mechanical Isolation Gametic (Postmating, Prezygotic) Isolation 7. Postzygotic Isolation Extrinsic Postzygotic Isolation Intrinsic Postzygotic Isolation The Frequency of Various Forms of Postzygotic Isolation The Evolution of Extrinsic versus Intrinsic Postzygotic Isolation Genetic Modes of Intrinsic Postzygotic Isolation 8. The Genetics of Postzygotic Isolation Haldane's Rule The Genetic Basis of Postzygotic Isolation 9. Polyploidy and Hybrid Speciation Polyploidy Recombinational Speciation 10. Reinforcement The Data The Theory Alternative Explanations Distinguishing the Alternatives 11. Selection versus Drift Speciation by Selection Speciation by Drift Theoretical Criticisms Recent Peak Shift Models The Data 12. Speciation and Macroevolution Rates of Speciation Factors Affecting Speciation Rates Species Selection Appendix: A Catalogue and Critique of Species Concepts
Library of Congress Subject Headings for this publication: Species