Invasive Invertebrates
Seven-spotted Lady Beetle (Coccinella
Octagonal-tail Worm Dendrobaena octaedra
Multi-coloured Asian Lady Beetle (Harmonia axyridis)
Larch Sawfly (Pristiphora erichsonii)
The latter three often are introduced and disseminated through horticulture. Never acquire or release these species in the Yukon. The two invasive lady beetles are known to compete with native lady beetles such as the Transverse Lady Beetle (Coccinelly transversalis), causing a decrease in their survivorship and abundance. If you detect octogonal-tail worm, please do everything you can to control it and to eradicate it where possible. Never release it in the wild.
Other Invasive Animals
On several occasions, european wild boars/swine/pigs (sus scrofa) have escaped their Yukon enclosures but could be tracked down and destroyed. This species is exceptionally invasive, and can form hybrids with domestic pig (Sus domesticus) that are even more problematic. Southern Canada and the continental USA are at grips with a severe european wild boar infestations. Escapees are know to be able to survive harsh winter conditions.
As well, goldfish (Carassius auratus) and cherry shrimp (Neocaridina davidi) have occasionally been dumped into hot springs such as Takhini’s or warm springs such as Atlin’s.
Some elk (Cervus canadensis) populations are introduced to the Yukon, and others are natural colonizers. Bison (Bison bison) is considered a re-introduction.