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Spring Nights Are Filled with Amphibian Chorus

April 29, 2008 - On a rainy night when the temperature is above 40 degrees you can not only hear the chorus of frogs but see Maine's wonderful amphibians.

Keep your eyes peeled for frogs and salamanders coming out of the woods, crossing your yard, the road, or whatever obstacle might be in their way. These critters are making their annual migration from winter habitat to breeding habitat - they are headed for vernal pools.

Vernal pools are generally small depressions in the woods that fill with water during spring and fall, and frequently dry up in the summer. These woodland pools don't have fish living in them and don't have an inlet or outlet that allows fish to get to them. That's why they make great nurseries for tadpoles, and baby salamanders.

In fact, in Maine, vernal pools provide the primary breeding habitat for wood frogs, spotted, blue-spotted and four-toed salamanders and fairy shrimp. They also provide critical habitat for some endangered species such as the Blanding's turtle and the ringed boghaunter dragonfly.

Vernal pools are valuable to many other animals as well. All of those hundreds of eggs that the frogs and salamanders lay are meals for hungry skunks, weasels and other larger animals, including bears. In addition, deer and moose visit the pools in early spring for fresh leaves because vernal pools tend to green up earlier than the rest of the woods.

The surviving eggs hatch within a few weeks and tadpoles and larvae emerge. Once the young frogs and salamanders leave the pool, they are still hunted by skunks and weasels and lots of other animals looking for food.

The frogs and salamanders that survive make their way to either a forested swamp or some dry part of the woods to spend the summer. Wood frogs have been shown to migrate up to 1,000 feet from the pond they were born in to find summer habitat - that's a long way for an animal that small.

Next spring, this new generation of frogs and salamanders will make their way back to the same vernal pool in which they were born, to start the process all over again. It's important to protect not only the vernal pool itself, but also the land around the pools.

A new law, enacted by the Maine Legislature in 2007, has helped to protect the vernal pools and surrounding areas to make sure this continuing cycle of life can take place.

To learn more about vernal pools go to MaineDEP.com and click on the Keyword "vernal pools."

This column was submitted by Mary Pierce, formerly an Environmental Specialist with the Maine Department of Environmental Protection's Bureau of Land and Water Quality. E-mail your environmental questions to infoDEP@maine.gov or send them to In Our Back Yard, Maine DEP, 17 State House Station, Augusta, ME 04333.

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