Re: News: Researchers document rapid, dramatic 'reverse evolution' in

(snipped)
"We propose that the most likely cause of this reverse evolution in the
sticklebacks is from the higher levels of trout predation after the sudden
increase in water transparency," said Peichel, ...

This again fits my selection pressure model

The greater the selection pressure (directional or diversifying
selection)
the greater the speed of evolution in the area of selection pressure
And
the lower the seledtion pressure (stabilizing selection)
the lower the speed of evolution in the area of selection pressure.

.

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