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The rivers, streams, lakes, and seacoast of the Granite State are increasingly hosting some unwelcome guests. A slew of invasive species is threatening native plant and animal life, as well as those humans who spend their time working, living, and playing in and around New Hampshire's waterways. We'll take a look at some these ecological enemies, the dangers they pose to commerce and recreation, and what steps are being taken to combat them.

Guests

• Joel Harrington, director of government relations for The Nature Conservancy's New Hampshire chapter. He was formerly the vice-president of policy for the Audubon Society of New Hampshire and the director of government relations for the New Hampshire Lakes Association.
• Amy Smagula, Limnologist with the State Department of Environmental Services, where she coordinates the Exotic Species and Clean Lakes programs.

We'll Also Hear From

• James "Jeb" Byers, Associate Professor of Zoology at the University of New Hampshire