<span>The effect of presidential coattail describes when a popular president running for reelection brings additional party candidates into office. This effect is brought about by the popularity of the presidential candidate who brings in supporters that will also vote for his/ her party's candidates. This is in relation to the idiom, ride on coattails, which means riding on another person's success. </span>
Answer:
I would say this is niche partitioning.
Explanation:
Every organism has a certain range of requirements called a niche. The competitive exclusion principle states that two organisms cannot occupy the exact same niche without one out-competing the other. Niche partitioning is basically changing some aspects of a niche so that there is no need for competition.