PB mag has had several articles on Evolution vs Adaptation.

There is IMO a fine line between when adaptation becomes evolution.

The info (status of change) is constantly changing and there are no easy answers.

Here is the start on one article

On The Pond Boss Forum recently there have been discussions on adaptation vs. evolution. This conversation centered around how do fish change, what is the mechanism (environment or genetics) and how long does it take. In Science Class we all learned about Darwin’s theories regarding Evolution. We were taught that Evolution is a slow gradual process. Darwin wrote, "…Natural selection acts only by taking advantage of slight successive variations; she can never take a great and sudden leap, but must advance by short and sure, though slow steps." Parts of Darwin's Theory of Evolution are now a theory in crisis in light of the recent tremendous advances in molecular biology, biochemistry and genetics. Darwin’s prediction was right on a geological scale (Earth’s age) but it has since been shown that evolution of species can happen much faster. In bacteria and insects, single generation change is known to occur. In more advanced species (fish and larger creatures), it was thought that things are more gradual, but still, do occur in sudden bursts.


and a conclusion

The discovery of continuing adult brain neurogenesis in mammals demonstrates that adaptive processes continue to shape the brain well beyond embryonic development. Because fish exhibit extensive neurogenesis in the brain throughout life as compared to mammals it is more likely a life-long process for brain growth in fish. These developments in embryonic and whole life brain development in fish resulting from environmental conditions (adaptation) is proof that adaptive change (through phenotypic plasticity) is quicker , more powerful and far more prevalent than previously thought.

Last edited by ewest; 04/14/22 11:20 AM.