In a hypothetical environment, fishes called pike-cichlids are visual predators of large, adult algae-eating fish (in other words, they locate their prey by sight). The population of algae-eaters experiences predatory pressure from pike-cichlids. Which of the following is least likely to result in the algae-eater population in future generations?
A) selection for drab coloration of the algae-eaters
B) selection for nocturnal algae-eaters (active only at night)
C) selection for larger female algae-eaters, bearing broods composed of more, and larger, young
D) selection for algae-eaters that become sexually mature at smaller overall body sizes

Question

Quizplus · Accepted Answer

Selection for larger female algae-eaters, bearing broods composed of more, and larger, young, would likely increase the overall size and number of the algae-eater population, making them less vulnerable to predation by the pike-cichlids. A, B, and D would all result in decreased visibility or vulnerability to predation, so they are more likely to be selected for.

In a Hypothetical Environment, Fishes Called Pike-Cichlids Are Visual Predators