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Showing 1 to 14 of 14 for “"Hybrid Zones"”.
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Mechanisms for partial reproductive isolation in a Bombina hybrid zone in Romania
… isolation in the case of secondary contact. Hybrid zones are ideal study systems in which to investigate mechanisms for the inhibition of gene flow. This thesis describes a mosaic hybrid zone between the ecologically differentiated fire-bellied toads Bombina bombina and B. variegata. I show …
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The Genetic Impacts of Mytilus Galloprovincialis On M. Trossulus In Northern Japan
… on the communities in which they invade. Through hybridization, invasive species also threaten the genetic integrity of the native species by means of genetic pollution. In the marine environment, the Mediterranean mussel Mytilus galloprovincialis is a highly invasive species that has successfully …
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Hybridization and the genetics of wing colour-pattern diversity in Heliconius butterflies
… drift. However, it is now recognized that hybridization between already divergent populations constitutes another important source of genetic and phenotypic variation, upon which natural and/or sexual selection can operate. Hence, the idea that hybridization can actually promote …
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Phylogeographic structure of the Atlantic pupfish, Cyprinodon variegatus (Cyprinodontidae), along the eastern coast of North America: Evidence from mitochondrial nucleotide sequences
… be may be possible to determine if secondary hybrid zones developed as a result of the last retreat of ice from North America during the Pleistocene, about 17,000 years ago. A definitive monophyletic northern clade was found using parsimony, distance, and maximum likelihood phylogenetic …
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Population Genetics and Speciation in the Plant Genus Silene (section Elisanthe)
… The maintenance of the species despite frequent hybridization at present-day hybrid zones is discussed. The fifth chapter discusses S. diclinis, a rare endemic found only in Valencia, Spain. The nature of population structuring and the evolutionary history of this species were investigated using …
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Hybridization Between the Watersnakes <i>Nerodia sipedon</i> and <i>Nerodia fasciata,</i> in the Carolinas: A Morphological and Molecular Approach
… and to study the dynamics across their hybrid zone in the Carolinas. Many of the morphological characters exhibited significant interspecific differences, although only the number of dorsally complete crossbands (CBa) was diagnostic by itself. A discriminant function analysis of …
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Morphometric Characterization of a <i>Mercenaria</i> spp. (Bivalvia) Hybrid Zone: Paleontological and Evolutionary Implications
Paleontological documentation of hybridization events has the potential to address a multitude of evolutionary and paleobiological issues unanswerable by purely biological means. However, previous studies of modern hybrids suggest that their morphology is often insufficient for their reliable …
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Evolutionary genetics and genomics of flower colour loci in an Antirrhinum hybrid zone
… maintenance of diversity between populations. In hybrid zones, loci that establish a barrier to gene flow between populations remain divergent, whereas neutral unlinked loci become mixed. In those instances, fit allelic combinations across several loci can be maintained through selection, but this …
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Staging frontier dynamics : interplay at the periphery of Manaus
… the Frontier has the potential for coupling and hybridization towards a new common project, one where built space and natural space are no longer mutually exclusive, but instead work within a systematic relationship that can adapt to land use transformations through time. The Amazonian frontier …
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Evolutionary history and hybridization in Passerina buntings
… importance to evolutionary biology and hybrid zones offer unique natural laboratories in which to investigate the ecological and evolutionary processes important in creating and maintaining biological diversity. By comparing introgression patterns of different loci, researchers can begin …
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Speciation Genomics in Australian Meliphagoid Birds
… flow between populations. While sampling across hybrid zones provide insight for an intermediate stage of speciation, comparative studies of multiple contact zones between populations at different stages of speciation would expand our broader understanding of the process itself. Suture zones …
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Speciation Genomics in Australian Meliphagoid Birds
… flow between populations. While sampling across hybrid zones provide insight for an intermediate stage of speciation, comparative studies of multiple contact zones between populations at different stages of speciation would expand our broader understanding of the process itself. Suture zones …
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Bighead and silver carp hybridization in the Mississippi River Basin: prevalence, distribution, and post-zygotic selection
Hybridization is a pervasive evolutionary phenomenon in plant and animal taxa. Understanding the evolutionary consequences of hybridization is dependent upon the ability to adequately detect genetically admixed individuals, characterize the maternal contribution and structure of hybrid zones, and …