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Latest Adaptive radiation Stories

Evolution Is Predictable Shown by Lizards
2013-07-19 10:21:14

University of California - Davis If you could hit the reset button on evolution and start over, would essentially the same species appear? Yes, according to a study of Caribbean lizards by researchers at the University of California, Davis, Harvard University and the University of Massachusetts. The work is published July 19 in the journal Science. The predictability of evolution over timescales of millions of years has long been debated by biologists, said Luke Mahler, a postdoctoral...

Madagascar No Longer An Evolutionary Hotspot Research Suggests
2013-07-10 16:49:38

University of Rochester Madagascar has long been known as a hotspot of biodiversity. Although it represents only one percent of the earth's area, it is home to about three percent of all animal and plant species on the planet. But research suggests the island's heyday of species development may be all but over. "A staggering number of species are found only on Madagascar," said Daniel Scantlebury, a Ph.D. student in biology, "but this research shows there are limits to the number of...

Explosive Evolution Need Not Follow Mass Extinctions
2012-02-14 04:26:34

Following one of Earth's five greatest mass extinctions, tiny marine organisms called graptoloids did not begin to rapidly develop new physical traits until about 2 million years after competing species became extinct. This discovery, based on new research, challenges the widely held assumption that a period of explosive evolution quickly follows for survivors of mass extinctions. In the absence of competition, the common theory goes, surviving species hurry to adapt, evolving new...

'Head-first' Diversity Drove Vertebrate Evolution
2011-12-21 09:32:25

New study of fish fossil records near extinction events contradicts previous models The history of evolution is periodically marked by explosions in biodiversity, as groups of species try out a wide range of shapes and sizes. With a new analysis of two such adaptive radiations in the fossil record, researchers have discovered that these diversifications proceeded head-first. By analyzing the physical features of fossil fish that diversified around the time of two separate extinction...

2011-07-04 12:33:23

The question of why there are so many species in the sea and how new species form remains a central question in marine biology. Below the waterline, about 30% of Hawai'i's marine species are endemic "“ being found only in Hawai'i and nowhere else on Earth "“ one of the highest rates of endemism found worldwide. But where did this diversity of species come from? Hawai'i is famous for its adaptive radiations (the formation of many species with specialized lifestyles from a single...


Word of the Day
sough
  • A murmuring sound; a rushing or whistling sound, like that of the wind; a deep sigh.
  • A gentle breeze; a waft; a breath.
  • Any rumor that engages general attention.
  • A cant or whining mode of speaking, especially in preaching or praying; the chant or recitative characteristic of the old Presbyterians in Scotland.
  • To make a rushing, whistling, or sighing sound; emit a hollow murmur; murmur or sigh like the wind.
  • To breathe in or as in sleep.
  • To utter in a whining or monotonous tone.
According to the OED, from the 16th century, this word is 'almost exclusively Scots and northern dialect until adopted in general literary use in the 19th.'
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