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High Reinvasion Potential of Phragmites australis in a Delaware River (USA) Tidal Freshwater Marsh Following Chemical Treatment: the Role of the Seedbank

  • Applied Wetland Science
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Abstract

Management of the invasive Phragmites australis haplotype has focused on controlling its abundance in wetlands where it reduces biodiversity. However, little information is available on establishment of native communities and reinvasion by seed following removal using herbicides. The potential for reinvasion and development of native vegetation were evaluated using a seedbank assay and a vegetation survey along gradients from the channel edge to the marsh interior (0, 5 and 20 m distance) in three tidal freshwater marsh sites - Natural, treatment 6 months prior (Treated), and untreated (Phragmites). Recolonization potential from the seedbank was high with >18,500 seedlings m−2 in Treated samples. Richness and density of native species were low in the interior of Treated and Phragmites sites as compared to the Natural marsh. Few species were present in Treated site vegetation 11 months following treatment where P. australis litter comprised a large proportion of the cover. Results indicate that planting native vegetation to outcompete P. australis seedlings and total removal of P. australis to cut off the seed supply may be necessary for successful longer-term restoration and establishment of native species.

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Data Availability

Seedling data is in the Supplemental Table and vegetation data is available upon request.

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Acknowledgements

Logistical support was provided by Mercer County Park Commission (Emily Blackman, Alexandria Kosowski, Alex Rivera, Jenn Rogers, Kelly Rypkema, and Jillian Stark) and NJ Department of Transportation (Jason Nowak); field help was provided by Kirk Raper and Nick Alpeza; Jen Scheibner and Alexis Windecker ably assisted with greenhouse duties. Rider University provided greenhouse space. Mark Gallagher from Princeton Hydro, Princeton, NJ provided treatment information. This research was funded by NSF Coastal SEES 1325466. We appreciate the careful reviews of two anonymous reviewers.

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This research was funded by NSF Coastal SEES 1325466.

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T. Elsey-Quirk and M.A. Leck conceived of, designed and implemented the study and wrote the manuscript. M.A. Leck maintained the greenhouse and identified the seedlings. Field surveys were conducted by T. Elsey-Quirk and M.A Leck. T. Elsey-Quirk analyzed the data.

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Correspondence to Tracy Elsey-Quirk.

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Elsey-Quirk, T., Leck, M.A. High Reinvasion Potential of Phragmites australis in a Delaware River (USA) Tidal Freshwater Marsh Following Chemical Treatment: the Role of the Seedbank. Wetlands 41, 12 (2021). https://doi.org/10.1007/s13157-021-01398-6

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