Natural selection and guppy antipredator activities.
Predation pressure causes modified guppy behavior such as shoaling (schooling).
The role of natural selection in shaping antipredator behavior can be tested by
- Low-predation pressure in the Paria river leads to a preference for small groups..
- Medium- to high-predation pressure in the Guanapo river leads to larger group
- Very-high-predation pressure om the Tranquille river leads to even larger group