but this time you start the test with an even mix of all four guppy types (brightest, bright, drab, and drabbest). You've also placed a whole host of guppy predators in the test pool: 30 rivulus ...

you find a significant decline in the number of moderately colored guppies. The brightest males and drabbest males are still faring pretty well under the extreme predation pressure, but all others ...