John Endler

Endler’s hypothesis was correct. Predation heavily influences guppy spot brightness. The
data from the second experiment especially supports this hypothesis. It shows that as predation
increases, spot brightness decreases. Endler’s greenhouse experiments show that without
predation, the spot brightness increases substantially over time. However, in the Cichlid ponds,
the spot brightness decreased substantially over time. The data he obtained from the field are also
consistent with the data form the lab. Finally, the data from the second experiment is very similar
and the same conclusions can be drawn.