Category Archives: Invasive Species

MN DNR Updates Endangered and Threatened Species Lists

For the first time since 1996, the Minnesota DNR has updated the list of endangered and threatened animals and plants in the state, adding over 180 species. Listed species are categorized as either endangered, threatened or of special concern. The list is based on scientific field studies and public hearings held over the past year.…

Northern Forests Threatened by Global “Worming”

In the March 25 Minneapolis Star Tribune, Lee Frelich, director of the University of Minnesota’s Center for Forest Ecology notes that the lowly earthworm, often thought of as a friend to the backyard gardener, is actually a dangerous invasive. Earthworms threaten northern forests by eating the duff and litter of the forest floor. This causes…

Warming Water and Invasive Species Changing the Character of Quetico-Superior Lakes

The Lake Superior summer water temperatures are increasing more rapidly than regional air temperatures.  According to an article in the Ely Timberjay, the surface water temperatures of Lake Superior increased approximately 6 degrees F between 1979 and 2006. This is significantly greater than regional atmospheric warming. How this change will impact biodiversity and the proliferation…

“Savannification” Still Expected in North Woods

University of Minnesota forest ecologist Lee Frelich continues to foresee a transition from forest to savanna taking place at the margins of Minnesota’s north woods. Newly published research suggests that within the century, the climate and ancillary factors will make significant changes to the state’s prairie/forest border.

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Gypsy Moth Numbers Increasing

The number of gypsy moths in northern Minnesota continues to rise, despite successful efforts to eradicate established populations of the exotic insect.

The Minnesota Department of Agriculture reported recently that it trapped 28,000 gypsy moths in the state in 2009, more than double the 2008 count.

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