Abstract
Lily Fen is a 6 hectare, well-developed, patterned fen located on Swans Island, Maine. In contrast to other patterned fens in Maine, Lily Fen occupies a coastal location and lies approximately 100 kilometers south of the geographic area where these landforms commonly occur. It is a poor fen dominated by Sphagnum species, including S. pulchrum, S. papillosum, and S. cf. flavicomans, with some intermediate or rich fen taxa such as Cladium mariscoides and Carex exilis. Calcium concentrations are less than 2 mg/L, and the pH is relatively high (ca. 6.0), both probably as a result of enhanced cation inputs from marine aerosols and complete nitrate reduction. High summer precipitation, input of nutrient-rich marine aerosols, a large catchment to basin ratio, highly permeable catchment soils, and a relatively steeply sloping surface likely contribute to the well-developed strings, flarks, and pools at this site.
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