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To gauge the amount of methylmercury in the environment, the National Park Service launched a research project more than a decade ago that measures the toxin in dragonfly larvae.
Sea squirts spread along the coast BAR HARBOR — An alien invader is popping up more frequently along the local coastline. Very few tunicates, the small marine animals more commonly known as sea squirts, are indigenous to the Northeastern United States and Eastern Canada. Yet, there have been plenty of sightings by beachcombers, fishermen, sea farmers and others whose work is focused in and on the sea. Tunicates come in many varieties. Some look like gelatinous ping pong balls or a clear bubble. Another, called the orange sheath tunicate, is bright orange or red in color with no defined sh...