Acadia National Park (ACAD) lies within a transition zone of the Maine coastline, containing ecological communities typical of both southwestern and "downeast" coastal Maine. Eleven of these communities, or "associations" as defined within the United States National Vegetation Classification, are rare within the state of Maine, and one is globally rare. The NPS Northeast Temperate Network (NETN) is establishing a long-term forest monitoring program in 10 national park units within the northeastern US. This program is designed to detect trends in forest condition. At ACAD, the network has...