One of Canada's worst invasive species may have arrived naturally
Most invasive species are introduced into the areas where they become damaging. That's part of why they tend to be so successful in taking over new environments and causing billions of dollars in damage.
A recent study suggests that one of North America's most damaging invasive species, the spiny water flea, may have arrived in the region centuries before humans introduced it. The spiny water flea, known scientifically as Bythotrephes longimanus and Bythotrephes cederströmii, is a tiny aquatic animal that can wreak ecological and economic havoc in new environments.
Traditionally, it was believed to have been unintentionally transported from Europe to Lake Ontario by cargo ships in the early 1980s. However, researchers have now discovered evidence that this may not be the case. In Three Mile Lake in Muskoka, Ontario, they found spiny water flea jaws dating back more than 350 years, predating the arrival of European settlers in the area.
This finding challenges the conventional understanding of the species' introduction and raises questions about how and why it became such a prevalent and problematic invasive species in North America. The spiny water flea's presence in the region predates the completion of the St. Lawrence Seaway in 1959, which would have allowed easier transport from Europe.
The researchers propose that climate change and the natural migration patterns of waterfowl may have facilitated the spiny water flea's arrival in North America, highlighting the complex factors that contribute to the spread of invasive species.
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