Narrator:        This is Science Today. Commercial harvesting of fish and wildlife is quickly reshaping the wild populations that remain due to the practice of harvesting vast numbers of species and targeting large, reproductively mature individuals. Those were the findings of a novel study led by Chris Darimont of the University of California, Santa Cruz, which coincidentally was released during the 200^th year of Charles Darwin's birth.

Darimont:       This work comes at a timely period in which scientists are recognizing that Darwin was indeed right - and in fact, organisms can change within populations very, very quickly and as it turns out, our work shows that among the most rapidly changing organisms on the planet, ones that are changing so fast that even Darwin might be shocked, really underscores the presence and power of natural selection acting in an increasingly unnatural world. A world in which humans are becoming a dominant selective force.

Narrator:        For Science Today, I'm Larissa Branin.