Yes, ecology shapes evolution, but guppies show reverse also true
Sunday, February 7, 2010 - 12:00
in Biology & Nature
In the natural stream communities of Trinidad, guppy populations live close together, but evolve differently. Upstream, fewer predators mean more guppies but less food for each; they grow slowly and larger, reproduce later and less, and die older. Downstream, where predators thrive, guppies eat more, grow rapidly, stay small, reproduce quickly and die younger...