What is the main impact of invasive species on native ecosystems?

The main impact of invasive species on native ecosystems is their ability to outcompete native species for resources. Invasive species often thrive in their new environments due to a lack of natural predators and can quickly establish large populations. They may exploit resources such as food, water, and habitat that native species rely on, leading to a decline in those native populations. This competitive advantage can disrupt existing ecosystems by altering species composition, reducing biodiversity, and changing the dynamics within food webs. As a result, the introduction of invasive species can significantly threaten the balance and health of native ecosystems, often leading to long-term ecological consequences.