Invasive Species 101 | National Geographic

Invasive Species: A Growing Threat

Understanding Invasive Species

• Invasive species are non-native organisms that significantly damage local ecosystems, economies, and human health. They compete with native wildlife for resources, leading to ecological imbalance.

• The Department of Agriculture is implementing strict measures to protect endangered trees from invasive species, highlighting the urgency of the situation.

Human Impact on Invasive Species Introduction

• Many invasive species are introduced through human activities, such as boats transporting organisms between water bodies. An example is the zebra mussel, which clogs pipes and disrupts beaches in the Great Lakes.

• Some invasive species are intentionally introduced; for instance, cane toads were brought to Australia in the early 20th century for pest control but have since caused a decline in native predator populations.

Broader Implications of Invasives

• In addition to animals, bacteria, fungi, and plants can also be invasive. The black wattle tree in South Africa serves as an example; it was introduced for timber but now threatens local water supplies due to its high consumption of water.

• The economic impact of invasive species is staggering—over a trillion dollars annually worldwide—due to their effects on health, ecosystems, and infrastructure.

Prevention Strategies Against Invasive Species

• Effective prevention methods include cleaning boats before moving them between waters, not releasing exotic pets into the wild, and planting gardens with native species. These actions can help mitigate the spread of invasives.