Here are some
images of typical guppy habitats on Trinidad, an island off the coast of Venezuela. Guppies usually occupy the entire length of a stream, from the trickling
headwaters to the much wider and deeper mouth. Dams like the ones seen here often
restrict the upstream movement of some of the more voracious predators, confining
them to the lowermost sections of a stream.
A section of stream
like this deep pool on Trinidad's Aripo River would not only contain guppies, but
also hungry predators.
Dams such as the one
seen here restrict predatory fish movements. A guppy population above the dam would
enjoy little to no predation pressure.
Dams no bigger than this
often keep some predators from moving upstream. Guppies in the pools just above would
face moderate predation levels.
Only the smallest and
least-effective guppy predators would likely find their way into this shallow pool.
Even trickles like this
tributary of the Quare River in Trinidad can sustain guppy populations, so long as
they contain water year-round.