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- 1. Evolutionary Biology
- 2. Species Concepts and Their Application
- 3. Morphological Species Characters and Sibling Species
- 4. Biological Properties of Species
- 5. Isolating Mechanisms
- 6. The Breakdown of Isolating Mechanisms (Hybridization)
- 7. The Population, Its Variation and Genetics
- 8. Factors Reducing the Genetic Variation of Populations
- 9. Storage and Protection of Genetic Variation
- 10. The Unity of the Genotype
- 11. Geographic Variation
- 12. The Polytypic Species of the Taxonomist
- 13. The Population Structure of Species
- 14. Kinds of Species
- 15. Multiplication of Species
- 16. Geographic Speciation
- 17. The Genetics of Speciation
- 18. The Ecology of Speciation
- 19. Species and Transpecific Evolution
- 20. Man as a Biological Species
- Glossary
- Bibliography
- Index