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Invasive Species
What are they anyway?
An 'invasive' is a species of plant, animal, aquatic life or micro-organism that is not native (to Yukon/an ecosystem) and whose introduction or spread is likely to have net negative effects on our society, our economy, our environment, or our health.
The term “invasive” is reserved for the most aggressive species that reproduce rapidly and cause major changes to the areas where they become established.
Frequently Asked Questions
Our FAQ section offers quick answers to common questions about invasive species, including how they spread, how to identify them, and what you can do to help prevent their introduction and movement. If you need more information, feel free to contact us.
IS THERE A DIFFERENCE BETWEEN INTRODUCED SPECIES AND INVASIVE SPECIES?
An introduced species is, with respect to a particular ecosystem, any species, including its seeds, eggs, spores, or other biological material capable of propagating that species, that is not native to that ecosystem. This means that the species was brought to a new environment by anthropogenic means. All invasive species are introduced species, but not all introduced species are invasive.
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An invasive species is any species whose introduction does, or is likely to, cause undesirable or detrimental impacts to humans, animals or ecosystems’. There are different degrees of invasiveness or aggressiveness.
WHY ARE INVASIVE SPECIES SUCH A THREAT?
Invasive species are a major threat to biodiversity, as they can permanently alter landscapes and ecosystem functions. As they spread, they can outcompete native plants and animals, leading to habitat changes and declines in biodiversity—especially when species that depend on specific habitats are displaced.
While invasive plants are of greatest concern in Yukon, there are also invasive animals present, such as goldfish (Carassius auratus) and the Seven-spotted Lady Beetle (Coccinella septempunctata).
HOW ARE INVASIVE PLANTS COMING TO THE YUKON?
Invasive plants are spread through several key pathways including increased travel and trade; transportation, horticulture, gardening, seed-mixtures (revegetation, birdfeed, wildflower mixes), recreation; and wildlife, livestock, humans, and pets.
HOW DO INVASIVE SPECIES SPREAD?
They often spread through human activities such as transporting soil, plants, firewood, boats, or outdoor equipment. Invasive species can also move naturally through wind, water, and wildlife, but human-assisted movement is one of the most common ways they are introduced to new areas.
How can I help prevent the spread of invasive species?
You can help by cleaning, draining, and drying all gear and equipment before moving between locations, avoiding the transport of plants or soil, and using local or certified firewood. Following best practices when recreating, gardening, or working outdoors makes a significant difference in reducing the risk of spread.
How do I report a suspected invasive species?
If you think you’ve found an invasive species, take note of the location and, if possible, take a clear photo for identification. Report the sighting through your local reporting system or contact us directly so it can be reviewed and, if necessary, followed up by the appropriate team.
Can invasive species be removed once they’re established?
Some invasive species can be controlled, managed, or contained once established, but removal is often more difficult and resource-intensive. Early detection and rapid response are key to preventing long-term establishment and limiting their spread.
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