Which statement best describes invasive species?

Prepare for the Maine Fish and Game Officer Test. Study with flashcards and multiple choice questions, each question features hints and explanations. Get ready for your exam!

Invasive species are non-native organisms whose introduction to a new area can cause harm to ecosystems, the economy, or human health. The statement that best describes this is the one defining invasives as non-native and capable of causing harm locally. This captures both origin and impact, which distinguishes invasives from native species (which belong to the local ecosystem) and from native species that are simply overabundant or introductions that have little or no impact. In practice, recognizing invasives helps officers focus on prevention, detection, and rapid response to protect habitats, fisheries, and public health. For context, non-native species such as certain aquatic plants or pests can spread quickly, outcompete native species, alter ecosystems, and create economic or health problems.