Abstract
We quantified the effects of invasive Phragmites australis on estuarine faunal communities using meta-analysis to compare invaded to uninvaded marshes and then evaluated whether ecological restoration could reverse those effects. Relative to uninvaded marshes, the quantity and condition of fauna in invaded marshes was significantly poorer. We detected negative impacts to fauna residing in the mid-Atlantic but not in New England and to fauna utilizing the marsh surface but not to those inhabiting tidal creeks. By taxonomic group, we found that the invasion negatively affected nekton but not invertebrates. Both adult and sub-adult nekton were adversely affected, although the magnitude of the effect on the sub-adults was four times greater than that for adults. Our results indicate that negative effects on fauna within the mid-Atlantic region largely drove the overall results. When restored marshes were compared to uninvaded marshes there were no significant differences across all metrics assessed, suggesting that the negative impacts of the invasion were reversed. A separate qualitative review of trophic data indicated that benthic microalgae and dominant vascular plants are important primary producers at the base of the food web in uninvaded, invaded, and restored salt marshes but the overall quantity and importance of microalgae to diet decreased in highly invaded systems due to decreased light, potentially reducing energy availability. Our analyses revealed that while estuarine communities are adversely affected by P. australis, impacts vary by region, habitat, taxonomic group, and life history stage and that restoration can reverse long-term effects over relatively short time scales.
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Acknowledgments
We thank Carla Lambertini, Daniel Simberloff, and an anonymous reviewer for their constructive comments that greatly improved this manuscript. Many thanks to Peter August for drafting the map of research sites for studies used in our analysis. We also thank the following agencies and organizations for their support: Environmental Protection Agency Science To Achieve Results Graduate Fellowship Program (FP-91710001-0), National Oceanic and Atmospheric Administration National Estuarine Research Reserve Graduate Fellowship Program (NA09NOS4200041), National Science Foundation Integrative Graduate Education and Research Traineeship Grant to the Coastal Institute at the University of Rhode Island (0504103), Philanthropic Educational Organization (Lellis-Dib3158688), Northeast Aquatic Plant Management Society, Rhode Island Natural History Survey and The Nature Conservancy of Rhode Island (Lellis-Dibble 05-30-09), University of Rhode Island Agricultural Experiment Station (RI00H-332, 311000-6044), University of Rhode Island Coastal Fellows Program, and the U.S. and Czech Fulbright Commissions.
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Dibble, K.L., Pooler, P.S. & Meyerson, L.A. Impacts of plant invasions can be reversed through restoration: a regional meta-analysis of faunal communities. Biol Invasions 15, 1725–1737 (2013). https://doi.org/10.1007/s10530-012-0404-9
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DOI: https://doi.org/10.1007/s10530-012-0404-9