Abstract
Invasion of Phragmites australis (common reed) in wetlands throughout North America, and particularly the Laurentian Great Lakes Basin, poses significant ecological problems. The extended period of low Great Lakes water levels from 2000 to 2013 created conditions for large expansions of Phragmites in the Great Lakes coastal zone. The following extended period of high water in the Great Lakes during late 2010’s, culminating in record high lake levels in 2020 allowed managers to take advantage of high water by using a cut-to-drown management strategy (i.e., cutting plants below the water surface to stop the flow of atmospheric gases) to control Phragmites populations. To examine the efficacy of a cut-to-drown control strategy, we conducted a controlled-greenhouse study that tested the effect of submergence and timing of cutting (early or late in growing season) on Phragmites growth and viability post treatment. To evaluate Phragmites growth and viability, we measured belowground biomass, rhizome non-structural carbohydrate content (NSC), and rhizome viability following a cut-to-drown treatment. Applying a cut-to-drown treatment reduced average belowground biomass production up to 99%, limited rhizome NSC content up to 83%, and inhibited rhizome viability, regardless of timing of cutting treatments. These results suggest that under high-water conditions, utilizing a cut-to-drown strategy has potential for being a useful control mechanism for Phragmites. However, further research is needed to determine to what extent these results will lead to sustained reductions in growth and viability under field conditions, where rhizome belowground biomass and storage capacity are much larger.
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Acknowledgements
We thank Theresa Gruninger, Alexandra “Sasha” Bozimowski, and Annie Bonds for their tireless efforts in monitoring and harvesting all 162 plants. Additionally, we thank the Ypsilanti Township Recreation and Parks Commission in Michigan for allowing us to collect our plants at North Hydro Park and the University of Michigan Matthaei Botanical Gardens for allowing us to conduct our experiment at their greenhouse facility. We thank Janice Gilbert for providing an early review of this manuscript. Lastly, we thank Michelle Vander Haar of the U.S. Fish and Wildlife Service (USFWS) for development, conceptualization, and continued project participation through our USFWS/USGS Science Support Partnership (Project number: 2021-R3-09), without which this work would not have been possible. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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This study was funded by the U.S. Geological Survey and The U.S. Fish and Wildlife Service Science Support Partnership Project number: 2021-R3-09.
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WAB, SLW, and KPK designed the experiment. SLW and WAB set up and carried out up the experiment. SLW and WAB collected the data. SLW and WAB analyzed the data and prepared the figures. SLW wrote the main manuscript text. WAB and KPK procured the funding and edited the text. All authors reviewed the manuscript.
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Widin, S.L., Bickford, W.A. & Kowalski, K.P. Phragmites management in high water: cutting plants under water limits biomass production, carbohydrate storage, and rhizome viability. Wetlands Ecol Manage 31, 745–756 (2023). https://doi.org/10.1007/s11273-023-09946-z
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DOI: https://doi.org/10.1007/s11273-023-09946-z