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In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, alters biotic interactions or opens new environmental niches.
The last common ancestor of the silversword alliance was likely a mat and rhizome forming plant not more than .3 metres (0.98 ft) tall, with a chromosome number of 2n = 16, and perhaps another similar species. Species of Dubautia however have 2n = 14 chromosomes. How the silverswords' chromosome number arose is a matter of some uncertainty, but ...
For example, 50% of endemic bird areas are found on islands. [2] Endemism is often the result of adaptive radiation. [1] Adaptive radiation is when a single species colonizes an area and rapidly diversifies to fill all of the available niches. A common example is the assemblage of finch species documented by Charles Darwin in the Galapagos ...
For example, Albinaria land snails on islands in the Mediterranean [1] and Batrachoseps salamanders from California [2] each include relatively dispersal-limited, and closely related, ecologically similar species often have minimal range overlap, a pattern consistent with allopatric, nonecological speciation.
All three species of Hawaiian Vaccinium show the opposite pattern of adaptive radiation: they are widespread throughout the Hawaiian islands, and have retained their dispersal capacity, [6] [1] thus suggesting, among other hypotheses, a relatively recent dispersal to the archipelago. However, the extent of Hawaiian Vaccinium’s diversification ...
Anolis lizards are some of the best examples of both adaptive radiation and convergent evolution.Populations of lizards on isolated islands diverge to occupy separate ecological niches, mostly in terms of the location within the vegetation where they forage (such as in the crown of trees vs. the trunk vs. underlying shrubs). [10]
Seen here is adaptive radiation of finch A (Geospiza magnirostris) into three other species of finches found on the Galapagos Islands. Due to the absence of other species of birds, the finches adapted to new niches.
Adaptive radiation is when many species emerge in a short time. Yes, allopatric speciation may have been the manner in which all the species emerged in the adaptive radiation. Still, this does not make the radiation a form of speciation. Radiation is a form of a (large) group of speciations. --Ettrig 17:40, 17 October 2010 (UTC)