Abstract
High latitude salt marsh plant communities are frequently exposed to conspicuous winter ice disturbances, which trigger secondary succession. In this paper, we document the recovery of a northern New England salt marsh from a severe winter icing event in 1998. Ice disturbances that killed plants but that left the underlying peat intact recovered rapidly. However, ice damage that killed plants and removed the underlying peat, led to areas of physiologically harsh edaphic conditions, specifically waterlogged and anoxic soils that limited plant recolonization. A transplant experiment revealed that only the most stress-tolerant plants were capable of invading the most stressful portions of ice disturbances. A second experiment that artificially dried disturbance patches accelerated patch recovery. These data suggest that recovery from intense ice disturbance is dependent on stress-tolerant plants invading edaphically harsh disturbances, eventually facilitating the recolonization of the community. This process likely takes longer than a decade for full recovery to occur in the areas where both plants and the peat base are removed.
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Acknowledgements
This work was supported by a National Estuarine Research Reserve Graduate Fellowship (P.J.E.) and by the Andrew Mellon Foundation (M.D.B.). We thank Caitlin Mullan, Cheryl Helms, and Nancy Emery without whom this project would not have been possible. Michele Dionne and all the staff at the Wells National Estuarine Research Reserve deserve special thanks for facilitating our work at their reserve. This manuscript was greatly improved by the thoughtful comments of C. Mullan, J. Witman, and B. Silliman.
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Ewanchuk, P.J., Bertness, M.D. Recovery of a northern New England salt marsh plant community from winter icing. Oecologia 136, 616–626 (2003). https://doi.org/10.1007/s00442-003-1303-7
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DOI: https://doi.org/10.1007/s00442-003-1303-7