If one builds a canal linking a predator-rich pond to a predator-poor pond, then what type(s)of selection should subsequently be most expected among the mosquitofish in the original predator-rich pond, and what type(s)should be most expected among the mosquitofish in the formerly predator-poor pond?
A) stabilizing selection; directional selection
B) stabilizing selection; stabilizing selection
C) less-intense directional selection; more-intense directional selection
D) less-intense disruptive selection; more-intense disruptive selection

Question

Quizplus · Accepted Answer

The creation of the canal will result in the migration of mosquitofish between the two ponds, which will expose the populations to different predation pressures. In the original predator-rich pond, the mosquitofish that are best adapted to survive predation (e.g. those with faster swimming speed or better camouflage) are more likely to survive and pass on their genes. This leads to less-intense directional selection, as the predator pressure is already high. In the formerly predator-poor pond, the introduction of predators will select for mosquitofish that are better at avoiding predation (e.g. those with better hiding skills or breeding strategies). This results in more-intense directional selection as the population is adapting to the new threat. Therefore, the most expected selections are less-intense directional selection among mosquitofish in the original predator-rich pond and more-intense directional selection among mosquitofish in the formerly predator-poor pond.

If One Builds a Canal Linking a Predator-Rich Pond to a Predator-Poor