Inbreeding, the mating of close kin, and outbreeding, the mating of distant relatives or unrelated organisms, have long been important subjects to evolutionary biologists. Inbreeding reduces genetic diversity in a population, increasing the likelihood that genetic defects will become widespread and deprive a population of the diversity it may need to cope with its environment. Most plants and animals have evolved behavioral and morphological mechanisms to avoid inbreeding. However, today many endangered species exist only in small, very isolated populations where inbreeding is unavoidable, so it has become a concern for conservationists. In this volume, twenty-six experts in evolution, behavior, and genetics examine the causes and consequences of inbreeding. The authors ask whether inbreeding is as problematic as biologists have thought, under what ecological conditions inbreeding occurs, and whether organisms that inbreed have mechanisms to dampen the anticipated problems of reduced genetic variation.
The studies, including theoretical and empirical work on wild and captive populations, demonstrate that many plants and animals inbreed to a greater extent than biologists have thought, with variable effects on individual fitness. Graduate students and researchers in evolutionary biology, animal behavior, ecology, and conservation biology will welcome this wide-ranging collection.
1. Sex, Mating Systems, Inbreeding, and Outbreeding Nickolas M. Waser Part One Theoretical Perspectives 2. Theory and Data Pertinent to the Relationship between Heterozygosity and Fitness Jeffry B. Mitton 3. The Evolution of Inbreeding in Haploidiploid Organisms John H. Werren 4. Genetic Incompatibility as a Eugenic Mechanism Marcy K. Uyenoyama 5. Inbreeding and the Evolution of Social Behavior Richard E. Michod 6. The Statics and Dynamics of Mating System Evolution Donald M. Waller 7. Small Populations, Inbreeding, and Speciation Daniel J. Howard 8. The Natural and Unnatural History of Inbreeding and Outbreeding William M. Shields Part Two Empirical Perspectives 9. Population Structure, Optimal Outbreeding and Assortative Mating in Angiosperms Nickolas M. Waser 10. Inbreeding and Outbreeding in marine Invertebrates Nancy Knowlton and Jeremy B. C. Jackson 11. Inbreeding and Outbreeding in Fishes, Amphibians, and Reptiles Bruce Waldman and Jeffrey S. McKinnon 12. Evidence for and Consequences of Inbreeding in the Cooperative Spiders Susan E. Riechert and Rose Marie Roeloffs 13. Inbreeding in Birds Ian Rowley, Eleanor Russell, and Michael Brooker 14. The Natural History of Inbreeding and Outbreeding in Small Mammals Andrew T. Smith 15. Inbreeding and Outbreeding in Captive Populations of Wild Animal Species Robert C. Lacy, Ann Petric, and Mark Warneke 16. Dispersal, Kinship, and Inbreeding in African Lions Craig Packer and Anne E. Pusey 17. Inbreeding and Outbreeding in Primates: What's Wrong with "The Dispersing Sex"? Jim Moore Part Three: Epilogue 18. Inbreeding in Egypt and This Book: A Childish Perspective William D. Hamilton