Question

Why do invasive species pose such a threat? (Site 1)

short paragraph

Answer 1

Invasive species threaten ecosystems, economies, and human health because they often spread quickly, lack natural predators, and outcompete or prey on native species, leading to reduced biodiversity and disrupted food webs. They can introduce new diseases, hybridize with native species, or alter habitats (for example by changing fire regimes or water flow), which undermines ecosystem services like pollination, water purification, and erosion control. The result is costly damage to agriculture, fisheries, forestry, and infrastructure, plus increased management and restoration expenses.