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Geographical isolation represents a major speciation factor in most animals and plants and causes a physical barrier to gene flow between populations, leading to the emergence of new species [11,43]. Barriers to gene flow (reproductive barriers in sexual organisms) may be raised by neutral processes such as genetic drift.
27 Απρ 2012 · The focus here is on outlining some of these major developments, specifically in the context of paleontology, by emphasizing the significance of geographic isolation and allopatric speciation, punctuated equilibria, and the Turnover Pulse Hypothesis to evolutionary theory.
Reproductive isolation. The environment may impose an external barrier to reproduction, such as a river or mountain range, between two incipient species but that external barrier alone will not make them separate, full-fledged species.
18 Απρ 2012 · Geographic isolation (vicariance) or geographic merging (geodispersal) can occur for a variety of reasons (sea level rise, splitting of continents, mountain building). In addition, the growth of a large supercontinent (or breakup) may change the climatic zonation on the globe and form a different type of barrier for species migration.
Geographic isolation is known to contribute to divergent evolution, resulting in unique phenotypes. Oftentimes morphologically distinct populations are found to be interfertile while reproductive isolation is found to exist within nominal ...
20 Ιαν 2010 · Under what conditions does geographic isolation constitute a reproductive isolating barrier? and How do we estimate the “importance” of different isolating barriers? Here, we address these questions, providing historical background and offering some new perspectives.
Geographic isolation refers to the separation of populations by physical barriers, such as mountains, rivers, or distances, which prevents them from interbreeding. This separation can lead to the development of distinct evolutionary paths, ultimately contributing to the process of allopatric speciation as isolated groups adapt to their unique ...
