speciation

(redirected from Species barrier)
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Words related to speciation

the evolution of a biological species

References in periodicals archive ?
We have identified a striking example of two viruses that are repeatedly overcoming the species barrier with catastrophic consequences," said Stephen Price from University College London's Genetics Institute and author of the research.
Certain human activities enabled some pathogens to cross the species barrier directly.
Avian influenza viruses are highly species-specific, but have, on rare occasions, crossed the species barrier to infect humans.
It turned out that males of other species were attracted to females who didn't have these signals, so that seemed to eliminate the species barrier.
Despite the millions of cases of bird flu among birds, there have been few human deaths because it is difficult for the virus to jump the species barrier.
As more animals are raised in industrial-style operations, confining them by the tens of thousands, it is likely that other diseases will emerge and jump the species barrier from animal to humans.
The viruses are normally species specific and only infect pigs, but they sometimes cross the species barrier to cause disease in humans.
This could mean that the virus is most deadly after jumping the species barrier between pigs and humans, and becomes less lethal in succeeding generations of human-to-human transmission.
Now, in "Nephilim Stargates: The Year 2012 and the Return of the Watchers," he asks, "What if, by corrupting the species barrier in which each creature was to recreate after its 'own kind,' Watchers (or demons) had successfully mingled human-animal DNA, creating something new, a construct that God had not made, manipulating genetic material and crossing the species barrier, which God had forbade, resulting in a body they could incarnate within?
Only the H5, H7 and H9 versions of in-fluenza A - the type of flu which can cause pandemic have crossed the species barrier to humans.
The paper, published in the Proceedings of the Royal Society of London, Series B, looks at how new killer diseases such as AIDS, Ebola and bird flu have leapt the species barrier to humans in the past three decades.
PARIS: Scores of infectious diseases have emerged to threaten humans in the past decades as viruses leap the species barrier from wild animals and bacteria mutate into antibiotic-resistant strains, scientists reported on Wednesday.
But Ken Bell, 80, the former managing director of Ken Bell Seafood Company, said researchers should test on him rather than risk breaking the species barrier during cell research on human-animal embryos.
Of the few avian influenza viruses that have crossed the species barrier to infect humans, H5N1 has caused the largest number of detected cases of severe disease and death in humans," according to the Web site for the Centers for Disease Control and Prevention.
It is one of the few avian-influenza viruses to have crossed the species barrier to infect humans, and it is the most deadly of those that have crossed the barrier.