Research Articles: All posts tagged 'species'

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Rapid Microevolution and Fitness Cost 6/6/2011 - by Stephen Caesar MA

Frequently in this column, the phenomenon of fitness cost has been discussed. This is when an organism, as it undergoes minor changes in reaction to changes in its environment, improves in one area of its abilities but pays a price by becoming less fit in another area. These minor changes are known as microevolution, in which the individual organism may undergo noticeable alterations and improvements, but does not become a new, superior species.

Blind Fish See 6/12/2009 - by Stephen Caesar MA

A well-known icon of evolution is the blind fish that lives in numerous caves in Mexico. At some time in the past, sighted fish living in the sunlit waters of Mexico entered lightless caves and, over time, lost the ability to see...

Hybridization Creates New Species 4/14/2009 - by Stephen Caesar MA

When new species appear suddenly in the fossil record, scientists automatically ascribe the new appearance to evolution in the classical Darwinian style. However, it is now known that brand-new, viable, reproducing species can suddenly appear not necessarily through evolution and survival of the fittest, but through the hybridization of separate, already-existing species...

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