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Transplanted guppies may experience a behavioral change depending on…
Transplanted guppies may experience a behavioral change depending on predation regime.
Inspection behavior
A "school" of several fish inside a plastic bottle are placed inside a tank along with the guppy being tested. A model of a predator is then placed in the tank and the single guppy's behavior is observed.
Only guppies from high predation locations
Similarly to the schooling data, the same two populations who schooled less also inspected the predator from the school facing side of the predator less as well. But, as far as distance of their approach all
Discussion
Selection pressure by predatory behavior in the guppies habitat did help to shape how the guppies behaved in their experiments
Morphology and life history
Transplant males had more conspicuous coloration
transplanted females took longer to mature and bore bigger offspring
Genetic drift, founder effects, and migration may have had effects on the guppy population's and could explain the differences in behavior witnessed. Particularly, these evolutionary models might explain the behavior of the two populations that schooled less than the other three high predation populations.
Further experiments involving selection and genetics may reveal more in the future.
Guppies from low and high predation locations
As seen with the schooling, guppies from the upper drainages, associated with low predation, inspected the model of the predator less from the school side of the predator than those guppies from lower drainages with higher predation. However, the upper guppies also did not approach the predator as closely as the lower ones did.
Schooling behavior
A "school" of guppies inside a plastic bottle is placed inside a tank along with another plastic bottle that is empty as a control. A single test guppy is added to the tank and its actions are recorded as to if it schools with the fish in the bottle or not.
Only Guppies from high predation locations
Of the guppies from high predation locations two populations showed lower rates of schooling than the other three populations. One of these two had males that showed aggression towards the school itself.
Guppies from low and high predation locations
Guppies from locations at the upper drainages, showed lower incidents of schooling than those with at the lower drainages