The next few questions refer to the following description.
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.
-Which type of reproductive isolation operates to keep the mosquitofish isolated,even when fish from different ponds are reunited in the same body of water?