At the start of the breeding season, male stickleback fish undergo a number of significant changes

Question

Their bellies become bright red and they become aggressive toward other males of the species, establishing and defending territories in which they build their nests. Although most male-male encounters consist solely of the resident lunging at an intruder, if this fails to drive off the intruder, the resident may bite. Females choose to mate with males that have large territories and well-constructed nests. What would you expect to happen as nest sites become scarcer?
A) The incidence of biting and other aggressive behaviors will increase.
B) Females will begin to choose mates that have no territories.
C) The color of the males will fade.
D) Nest construction will deteriorate.
E) Males will make their territories even larger.

Answer 1

A