Natural Hybridization and Evolution
by Arnold, Michael L.Format: Paperback
Pub. Date: 1997-01-30
Publisher(s): Oxford University Press
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Summary
This study draws on data from numerous sources that support the paradigm of natural hybridization as an important evolutionary process. The review of these data results in a challenge to the framework used by many evolutionary biologists, which sees the process of natural hybridization as maladaptive because it represents a violation of divergent evolution. In contrast, this book presents evidence of a significant role for natural hybridization in furthering adaptive evolution and evolutionary diversification in both plants and animals.
Author Biography
Michael L. Arnold has conducted studies on the evolution of both animals and plants, especially plant hybrid zones. He is Associate Professor in the Department of Genetics at the University of Georgia
Table of Contents
| Natural Hybridization: Definitions and History | p. 3 |
| Natural hybridization: Definitions | p. 3 |
| Natural hybridization: History of investigations | p. 5 |
| Summary | p. 10 |
| Natural Hybridization and Species Concepts | p. 11 |
| Introduction | p. 11 |
| The Biological Species Concept | p. 13 |
| The Recognition Species Concept | p. 16 |
| The Cohesion Species Concept | p. 18 |
| The Phylogenetic Species Concept | p. 19 |
| Natural hybridization and species concepts: Illuminators or impediments? | p. 20 |
| Summary | p. 21 |
| Natural Hybridization: Frequency | p. 23 |
| Introduction | p. 23 |
| Frequency and distribution of natural hybridization in plants | p. 24 |
| The fossil record | p. 25 |
| Floral surveys | p. 26 |
| Heterogeneities | p. 26 |
| Phylogenetic approach | p. 29 |
| Phylogenetic approach and falsifying hybrid speciation hypotheses | p. 41 |
| Frequency and distribution of natural hybridization in animals | p. 44 |
| Bosmina fossil record | p. 45 |
| Surveys of taxonomic groups | p. 47 |
| Heterogeneities | p. 50 |
| Phylogenetic approach | p. 52 |
| Summary | p. 63 |
| Reproductive Parameters and Natural Hybridization | p. 64 |
| Introduction | p. 64 |
| Premating barriers in plants | p. 66 |
| Premating behavior in animals | p. 69 |
| The per locus | p. 69 |
| Gamete recognition | p. 74 |
| Post-insemination processes in animals | p. 78 |
| Podisma and Chorthippus | p. 79 |
| Allonemobius | p. 79 |
| Tribolium | p. 80 |
| Post-pollination barriers in plants | p. 83 |
| Haplopappus | p. 84 |
| Perennial species of Helianthus | p. 87 |
| Annual species of Helianthus | p. 87 |
| Iris fulva x I. hexagona | p. 90 |
| Iris fulva x I. brevicaulis | p. 94 |
| Self- and hetero-incompatibility | p. 98 |
| Self-incompatibility: Introduction | p. 99 |
| Self- and hetero-incompatibility in plants: Similarities and differences | p. 105 |
| Postzygotic inviability and hybrid formation | p. 106 |
| Hetero-incompatibility in animals and plants: common patterns and a model | p. 108 |
| Summary | p. 111 |
| Natural Hybridization: Concepts and Theory | p. 113 |
| Introduction | p. 113 |
| Bounded Hybrid Superiority model | p. 116 |
| Mosaic model | p. 118 |
| Tension Zone model | p. 122 |
| Expectations | p. 123 |
| Case studies | p. 124 |
| Fitness estimates of hybrids and their parents | p. 140 |
| Chromosome races of Sceloporus grammicus | p. 143 |
| Mercenaria mercenaria and M. campechiensis | p. 144 |
| Artemisia tridentata ssp. tridentata and A. t. ssp. vaseyana | p. 144 |
| Iris fulva and I. brevicaulis | p. 145 |
| A new conceptual framework: The "Evolutionary Novelty" model | p. 147 |
| Rarity of F[subscript 1] formation, recency of contact, and the association of hybridization with ecotones and disturbance | p. 148 |
| Formation of later generation hybrids | p. 150 |
| Exogenous and endogenous selection and the structuring of hybrid zones | p. 151 |
| Summary | p. 154 |
| Natural Hybridization: Outcomes | p. 155 |
| Introduction | p. 155 |
| Natural hybridization and the origin of evolutionary lineages | p. 156 |
| Homoploid speciation | p. 156 |
| Polyploid speciation | p. 160 |
| Outcomes of natural hybridization | p. 162 |
| Natural hybridization, positive selection, and introgression | p. 162 |
| Natural hybridization, introgression, and habitat invasion | p. 172 |
| Natural hybridization and conservation biology | p. 175 |
| Summary | p. 180 |
| Natural Hybridization: Emerging Patterns | p. 182 |
| Viewpoint redefined | p. 182 |
| Vision redefined | p. 183 |
| References | p. 187 |
| Index | p. 213 |
| Table of Contents provided by Syndetics. All Rights Reserved. |
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