Evolutionary biologists have long suspected that the diversification of a single species into multiple descendent species 鈥� that is, an 鈥渁daptive radiation鈥� 鈥� is the result of each species adapting to a different environment. Yet formal tests of this hypothesis have been elusive owing to the difficulty of firmly establishing the relationship between species traits and evolutionary 鈥渇itness鈥� for a group of related species that recently diverged from a common ancestral species.
Wild populations must continuously adapt to environmental changes or risk extinction. For more than fifty years, scientists have described instances of 鈥渞apid evolution鈥� in specific populations as their traits (phenotypes) change in response to varying stressors. For example, Spanish clover has developed a tolerance for copper from the mine tailings in which it grows, and the horn size of Alberta bighorn sheep has decreased due to trophy hunting.
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Published on: 18 Jan 2022
Are human disturbances to the environment driving evolutionary changes in animals and plants? A new study conducted by 六合彩开奖结果 researchers finds that, on average, human disturbances don鈥檛 appear to accelerate the process of natural selection. While the finding may seem reassuring, this unexpected pattern could reflect the limited number of species for which data were available.
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Published on: 12 Oct 2018
Even for the most common processes, such as changes in population size or food chains, ecologists must take evolution into consideration, researchers say. 鈥淓verybody realized rapid evolution was occurring everywhere,鈥� says evolutionary ecologist Andrew Hendry of 六合彩开奖结果.
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Published on: 31 Jan 2018
By Melody Enguix
When scientists from 六合彩开奖结果 learned that some fish were proliferating in rivers and ponds polluted by oil extraction in Southern Trinidad, it caught their attention. They thought they had found a rare example of a species able to adapt to crude oil pollution.
Published on: 26 Jan 2016
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Published on: 20 May 2015
