Experiment one tested the effects of varying substrates on survival. In each of the three
tanks, 20 random guppies, 5 Rivulus and 5 Blue Acara were added. Each tank represents a
different substrate, the three substrates are sandy, muddy and vegetative. Spot brightness was
measured after 1000 days.
Experiment two tested the effects of varying levels of predation on survival. Only tank 1
was used, representing a constant sandy substrate. Five various levels of predation were tested
separately in this tank. For each trial 20 random guppies were added. Then 0, 4, 8, 12, or 16
predators were added. An equal number of Blue Acara and Rivulus were added, so with eight
predators, there were four Blue Acara and four Rivulus. Spot brightness was measured after 500
days.
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