Mainland Sea Caves - Winter Conditions
Follow this link for information on winter conditions at the mainland sea caves: what to wear, what to bring, how to get there, and things you should know. More »
There are current closures of areas within the Apostle Islands National Lakeshore. Click for more information and see if these closures will affect your trip. More »
“The two great destroyers of biodiversity are, first habitat destruction and, second, invasion by exotic species.” –E.O. Wilson
The spread of invasive species is recognized as a major factor contributing to ecosystem change and instability leading to biodiversity reduction. Preventing non-native invasives from becoming established has a much better rate of success than eliminating the species once it is established. At the Apostle Islands, both aquatic and terrestrial species continually threaten the park. From microscopic organisms to large trees, the potential is always there for non-native species to invade and overtake the fragile ecosystems that make the lakeshore a popular destination for hikers, boaters, and sightseers alike.
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Non-native invasive species
What can be done?
Spreading non-native invasive species
Apostle Islands National Lakeshore non-native species reports
Did You Know?
Brownstone (sandstone) was shipped from quarries in the Apostle Islands at the end of the 19th century to midwestern cities like Chicago, Milwaukee, Detroit, Cleveland, Minneapolis, and St. Paul where it was used to build some of the cities' most distinctive landmarks.