Rapid Speciation of Fish New Evidence For Evolution

on October 11, 2008

PhysOrg: “The Color of Evolution: How One Fish Became Two Fish” Evolution observed in nature—again! Will it convince us this time?

On a somewhat regular basis, we read reports that scientists have observed evolution in action—right before their very eyes! Time and time again, reading beyond the headline reveals that “devolution” might be the better word: the observed organism is losing genetic information as natural selection preserves certain genes and eliminates others as species interact with their environments. Losing such genetic information in creatures is the opposite of molecules-to-man evolution.

Cichlid speciation occurs when changes in how they see leads to changes in mate selection.

So what about the new cover-story study published in a recent issue of the journal Nature—might it include a more compelling account of Darwinian evolution?

The study reported on the rapid speciation of cichlid species of fish in Lake Victoria (in central Africa). Lake Victoria holds more than 500 cichlid species, which “play a leading role because of their rapid speciation and remarkable diversity,” PhysOrg reports. According to the study, cichlid speciation occurs when changes in how they see leads to changes in mate selection. This is surprising, since the most common mechanism for speciation begins when populations become geographically isolated and adapt to different environmental conditions.

In the case of the cichlids, however, the difference is one of perception. It seems that red light penetrates deeper into Lake Victoria’s murky waters than blue light. Not coincidentally, male fish in shallow waters tend to be green or blue, whereas in deeper waters, the males are a brilliant red.

“These fish specialized to different microhabitats,” explained the University of Maryland’s Karen Carleton, one of the study team members. “The visual system then specialized to the light environment at these depths and the mating colors shifted to match. Once this happened, these two groups no longer interbred and so became new species.”

In other words, one cichlid species that likely could see both types of light and included all of the possible colors has “evolved” (speciated) into separate species whose senses are limited and who only exhibit certain colors. So as usual, rather than a case of information-adding evolution (which is required for the molecules-to-man narrative of Darwinism), this is just another observation of natural selection weeding out information as speciation occurs, resulting in organisms that are custom-tailored to their environment but lack the genetic diversity their ancestors had.

Very interesting is that much of Carleton’s research on the role of animal sensing in speciation is to be presented at the University of Maryland’s Bioscience Research and Technology Review Day (coming next month), part of the university’s ongoing celebration of the 200th anniversary of Charles Darwin’s birth.

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