Clean Rivers in Maine Lead to Black Fly Swarms

Maine struggled with polluted rivers for years, and it took a lot of effort to get them cleaned up. After the Clean Water Act was passed in 1972, the clean-up tasks in rivers such as the Penobscot and Kennebec began, and now Maine residents are enjoying dozens of species that weren’t seen while the rivers were polluted. Unfortunately, they’re also dealing with an infestation of black flies, which are very sensitive to pollution and thrive in pristine flowing waters.

From Boston.com:

It’s an unintended barometer of good ecological health, but Maine officials are adamant they will not mess with nature in any way to provide relief.

“They can be so thick you breathe them in and they get stuck in your throat. They even get under your eyelids,” said Julia Brilliott, an Eastport resident who showed off four lumpy red welts on the back of her neck after climbing Mount Katahdin in Baxter State Park last week.

For the uninitiated, black flies are blood-sucking insects with a menacing reputation worthy of a late-night science fiction movie. Not all bite humans - some feed on other mammals and birds - but those that do are relentless daytime feeders. Even the nonbiting flies are often despised because they emerge by the millions in warm months and, lured by the carbon dioxide we exhale, swarm around people.

Situations like this require a tricky balance. Obviously, it’s better for the rivers to be clean so that more species can thrive – and animals like birds and trout feed on the flies. Though other states like Pennsylvania use chemicals to kill the fly larvae, which they claim are safe for the ecosystem, Maine officials refuse to use them, having the foresight to realize that a substance that’s toxic to one organism will likely be toxic to others as well.

Hopefully Maine officials will find a solution before residents decide that they’ve had enough of the black flies and get back to pollutin’.

Link [Boston.com]
Photo credit: Flickr user Benimoto

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