Final answer:
The displacement of native ant species is a consequence of the red imported fire ant invasion in the U.S.; these invasive ants are aggressive and have led to declines in native populations.
Step-by-step explanation:
Considering the ecological challenges posed by the red imported fire ant, an invasive species in the U.S., the correct statement is that the displacement of native ant species is a consequence of the red imported fire ant invasion. The red imported fire ants (Solenopsis invicta) are known for their aggressive behavior towards other ant species, leading to significant declines in native ant populations. The presence of red imported fire ants has not shown any benefits to native ant species, and their predatory behavior coupled with lack of natural predators in the U.S. has facilitated their spread and the associated ecological damage.
Furthermore, these invasive ants are not herbivores; they display omnivorous feeding habits, preying on a variety of organisms, including other insects. The aggressive competition and potential for displacement illustrated here is mirrored in other invasive species cases, where the introduction and subsequent successful establishment in new environments can lead to various ecological consequences, such as reducing biodiversity and causing extinction of native species.