Hybrids and hybrid zones
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منابع مشابه
Hybrid zones and the speciation continuum in Heliconius butterflies.
Tropical butterflies in the genus Heliconius have long been models in the study of the stages of speciation. Heliconius are unpalatable to predators, and many species are notable for multiple geographic populations with striking warning colour pattern differences associated with Müllerian mimicry. A speciation continuum is evident in Heliconius hybrid zones. Examples range from hybrid zones acr...
متن کاملUsing differential introgression in hybrid zones to identify genomic regions involved in speciation.
Hybrids between species provide information about the evolutionary processes involved in divergence. In addition to creating hybrids in the laboratory, biologists can take advantage of natural hybrid zones to understand the factors that shape gene flow between divergent lineages. In the early stages of speciation, most regions of the genome continue to flow freely between populations. Alternati...
متن کاملAn evaluation of narrow hybrid zones in vertebrates
A review of the literature on vertebrate hybridization reveals the existence of a number of narrow hybrid zones. Three hypotheses have been suggested to explain the occurrence of these zones. The ephemeral-zone hypothesis states that hybridization will end either in speciation or fusion of the hybridizing taxa by means of introgression. The dynamic-equilibrium hypothesis allows the possibility ...
متن کاملInterploidy hybridization in sympatric zones: the formation of Epidendrum fulgens × E. puniceoluteum hybrids (Epidendroideae, Orchidaceae)
Interspecific hybridization is a primary cause of extensive morphological and chromosomal variation and plays an important role in plant species diversification. However, the role of interploidal hybridization in the formation of hybrid swarms is less clear. Epidendrum encompasses wide variation in chromosome number and lacks strong premating barriers, making the genus a good model for clarifyi...
متن کاملDaphnia hybridization along ecological gradients in pelagic environments: the potential for the presence of hybrid zones in plankton.
The relative homogeneity of pelagic environments has been regarded as the reason for the absence of hybrid zones for hybridizing planktonic Daphnia (Crustacea: Cladocera); occasional dominance of interspecific hybrids over parental species was explained by their temporal superiority in fluctuating environments. However, water bodies with spatially varying environmental conditions might facilita...
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