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Hybrid zones can form from secondary contact. A hybrid zone exists where the ranges of two interbreeding species or diverged intraspecific lineages meet and cross-fertilize. . Hybrid zones can form in situ due to the evolution of a new lineage [1] [page needed] but generally they result from secondary contact of the parental forms after a period of geographic isolation, which allowed their ...
A hybrid zone may appear during secondary contact, meaning there would be an area where the two populations cohabitate and produce hybrids, often arranged in a cline. The width of the zone may vary from tens of meters to several hundred kilometers. A hybrid zone may be stable, or it may not.
Hybrizyme is a term coined to indicate novel or normally rare gene variants (or alleles) that are associated with hybrid zones, geographic areas where two related taxa (e.g. species or subspecies) meet, mate, and produce hybrid offspring. [1] The hybrizyme phenomenon is widespread and these alleles occur commonly, if not in all hybrid zones. [2]
It can occur across hybrid zones due to chance, selection or hybrid zone movement. [8] There is evidence that introgression is a ubiquitous phenomenon in plants and animals, [9] [10] including humans, [11] in which it may have introduced the microcephalin D allele. [12]
A tension zone is a transitional zone between two distinctive zones, the zones may be influenced by climatic factors, [1] [2] and geological variation. [ 3 ] creating a floristic tension zone. [ 4 ] A marine tension zone may be affected by variables such as depth, climate or salinity. [ 5 ]
A prediction of reinforcement is that assortive mating should be common in hybrid zones; a prediction that was confirmed in 19 of the 37 cases. [6] A survey of the rates of speciation in fish and their associated hybrid zones found similar patterns in sympatry, supporting the occurrence of reinforcement. [68]
The following is a list of ecoregions in Albania defined by the World Wide Fund for Nature (WWF).. Temperate broadleaf and mixed forests. Balkan mixed forests (Albania, Bosnia and Herzegovina, Bulgaria, North Macedonia, Serbia, Romania, Greece, Kosovo and Turkey)
Map of the regions and zones of Ethiopia. Halaba is a zone in the Central Ethiopia Regional State. [1] It is named after the Halaba people, and covers part of their homeland.. Located in the Great Rift Valley, Halaba zone is bordered on the south by an exclave of Hadiya Zone, on the southwest by the Kembata Zone, on the west and north by Hadiya Zone, on the north east by Lake Shala, and on the ...