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On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences.
-If one builds a canal linking a predator-rich pond to a predator-poor pond, then what type of selection should subsequently be most expected among the mosquitofish in the original predator-rich pond, and what type should be most expected among the mosquitofish in the formerly predator-poor pond?

Question

Quizplus · Accepted Answer

After the linking of the ponds, there would be an increase in gene flow between the predator-rich and predator-poor ponds. This would reduce the differences in swimming abilities of mosquitofish in the two ponds. Thus, the directional selection for swimming ability in the predator-poor pond would become more intense, as fish with better swimming ability would have an advantage in avoiding predators. In the predator-rich pond, where short, fast swimming bursts were advantageous, the selection pressure would be less intense as fish with continuous swimming abilities would have a higher chance of survival with reduced predation pressure. Therefore, the mosquitofish in the predator-poor pond would experience more intense directional selection, while the mosquitofish in the predator-rich pond would experience less intense directional selection in response to the linking of the ponds.

Please Use the Following Information to Answer the Question(s) Below