Natural Hybridization and EvolutionThis 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. |
Contents
| 3 | |
| 11 | |
Frequency | 23 |
4 Reproductive Parameters and Natural Hybridization | 64 |
Concepts and Theory | 113 |
Outcomes | 155 |
Emerging Patterns | 182 |
References | 187 |
Index | 213 |
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Common terms and phrases
alleles allopolyploid allozyme analyses Anderson anomalus barriers Barton and Hewitt Bombina brevicaulis Caledia captiva Chorthippus chromosome clade clines conspecific cpDNA crosses Cruzan and Arnold debilis demonstrate distribution divergent Drosophila environment-dependent evolution example exogenous selection F₁ fertilization fitness of hybrid forms frequency of hybrid Furthermore gametes gametophytic gene flow genomes genus Gly Thr Gly Grant and Grant habitats haplotypes Helianthus heterospecific pollen hexagona hybrid classes hybrid genotypes hybrid individuals hybrid populations hybrid progeny hybrid speciation hybrid zone hypothesis indicate introgression inviability involved Iris fulva Kyriacou loci male markers mating Mayr melanogaster molecular Moreton morphological mtDNA Nasrallah natural hybridization nuclear parental genotypes pattern petiolaris phylogenetic phylogeny plants and animals pollen tube pollen tube growth polyploid rDNA recombinant red wolf relative reproductive isolation Rieseberg Shaw simulans Soltis Species Concept sperm sporophytic Stebbins studies subspecies Szymura taxa taxon taxonomic Tension Zone model Thr Gly Thr tion Torresian variation
Popular passages
Page 64 - it must not be supposed that bees would thus produce a multitude of hybrids between distinct species; for if a plant's own pollen and that from another species are placed on the same stigma, the former is so prepotent that it invariably and completely destroys
Page 64 - If pollen from a distinct species be placed on the stigma of a castrated flower, and then after the interval of several hours, pollen from the same species be placed on the stigma, the effects of the former are wholly obliterated, excepting in some rare cases.
Page 113 - Pure species have of course their organs of reproduction in a perfect condition, yet when intercrossed they produce either few or no offspring. Hybrids, on the other hand, have their reproductive organs functionally impotent.
Page 19 - an irreducible (basal) cluster of organisms, diagnosably distinct from other such clusters, and within which there is a parental pattern of ancestry and descent
Page 18 - the most inclusive group of organisms having the potential for genetic and/or demographic exchangeability
Page 16 - that most inclusive population of individual biparental organisms which share a common fertilization system
Page 17 - ("that most inclusive population of individual biparental organisms which share a common fertilization system"; Paterson, 1985).