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Aquatic Invasive Species are some of the greatest threats to lake health in the Northwoods.Once an invasive establishes itself in a water body, it can cost thousands of dollars to remove it, if removing it is even possible at all.Rusty crayfish has been one such invasive species.First introduced to Trout Lake in Vilas County in the late 70s and 80s, the crayfish quickly settled in with population estimates in the thousands by the late 2000s.But now it seems nature is correcting course.

Global warming may also be affecting a global water circulation system abbreviated AMOC that includes the Gulf Stream, that river of ocean water that moves warm tropical water north along the east coast of North America before veering off toward Europe.

Fall is a time of transition in the Northwoods. The leaves are changing colors. Birds are migrating south. And people are getting ready for winter.In this episode of All Things Outdoors WXPR’s Katie Thoresen and Wisconsin DNR Conservation Warden Tim Otto talk about the changes their seeing in the Northwoods.