How can climate change create new opportunities for invasive species?

Climate change creates new opportunities for invasive species by altering environmental conditions in ways that favor nonnative organisms over indigenous ones. As global temperatures rise and atmospheric carbon dioxide concentrations increase, several mechanisms facilitate these invasions:

• Enhanced Growth and Reproduction: Higher levels of atmospheric carbon dioxide can boost photosynthesis, directly increasing the growth and reproductive success of certain invasive plants, such as kudzu and Oriental bittersweet.1
• Range Expansion: Warming temperatures allow invasive species and the diseases they carry to colonize habitats that were previously too cold or otherwise unsuitable for them. For example, milder winters can prevent the killing frosts that once limited the populations of certain insects and disease vectors, such as mosquitoes.12
• Disruption of Native Ecosystems: Climate change can stress native species, reducing their ability to compete for resources. When native populations are weakened or displaced by shifting climate patterns, invasive species with higher adaptive capacities can more easily establish breeding populations.312

Ecologists emphasize that monitoring and habitat restoration are essential to mitigate these threats and prevent further biodiversity loss.1