Two recently discovered fish species, both found in waters off a small island. The two species are very similar in general structure, but there are two key differences between them. In species A, males are brightly patterned with blue, red, and purple scales, whereas the females are drab, and males are much larger than females. In species B, males and females are the same size, and both are a dull brown color that blends in with the sandy bottom. You have decided to do an in-depth study of these two species, but to get your research grant, you must first develop some predictions about what you will find. What differences in behavior do you predict (list as many as you can think of)? How might the evolutionary histories of the two species differ?
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The situation where one gender develops a different plumage pattern or morphology is known as sexual dimorphism. Male birds often display elaborate plumage and colors as a means for attracting a mate. Mate selection is a strong selective pressure and has resolute in the development of special traits and behaviors. When sexual dimorphism exist there is usually an elaborate mating pattern incorporated into ...
Paragraph examining the evolution of sexual dimorphism in some species and not others. Web references provided.