What is a key characteristic of invasive species?

A key characteristic of invasive species is their ability to outcompete native species and disrupt ecosystems. This competitive advantage often stems from their fast growth rates, high reproduction potential, or the absence of natural predators in their new environments. As invasive species establish themselves, they can deplete resources such as food, space, and nutrients, leading to declines in native species populations. This disruption can fundamentally alter ecosystem functions, biodiversity, and habitat structure, making it a significant ecological concern.

In contrast, the other options imply misunderstandings about invasive species. They are not inherently beneficial, as they often harm the local ecosystems they invade. Being native to the environments they invade contradicts the definition of invasive species, which are, by definition, non-native. Finally, while some invasive species might require heavy management, the need for chemical treatments is not a defining characteristic but rather a potential response to their threat.