Competition leads to:
Interspecific competition can favor reduced overlap in resource use. Over ecological time, individuals may alter behavior or habitat use, producing niche differentiation or ecological compression. Over evolutionary time, selection can drive character displacement: heritable traits diverge because phenotypes using less-contested resources achieve higher fitness. Both outcomes weaken direct competition and can promote coexistence. Competition does not inherently create mutualism, and it need not eliminate both species. Competitive exclusion may remove one species if requirements remain too simil
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13