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Hydroperiod and Traditional Farming Practices Drive Plant Community Composition on Unregulated Atlantic Floodplain Meadows

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Abstract

The River Shannon, Ireland, among the last unregulated rivers in western Europe, has extensive floodplains and supports rare and endangered species and habitats, of ecological and cultural importance. Unregulated floodplains result in community composition responding directly to natural fluctuations in water level. This study assesses how hydrological factors and farming practices effect flood meadow plant communities. Three main plant communities were identified, forming an uninterrupted ecotone, along a gradient of dry to wet. Habitats of European conservation interest (Lowland Hay Meadows and Molinia Meadows) were well represented. Hydroperiod, calculated using microtopographical measurements, was the primary factor determining community composition and was negatively correlated with elevation and plant species richness. The botanical continuum comprised a range of insect-pollinated species, demonstrating the role of floodplains in providing pollinator services. Climate change projections indicate more prolonged winter flooding in the future, signifying potential range shifts for these plant species and communities; highlighting the need for appropriate conservation measures in the surrounding landscape. Low-intensity farming practices, with minimal fertiliser use and regular hay-mowing, played an essential, secondary role in maintaining plant species diversity. Retaining the floodplain topography, its associated hydrological regime and low-intensity farming practices, are necessary to maintain species diversity and ecosystem services.

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Acknowledgments

This project was funded by the Irish Research Council Science Engineering & Technology (IRCSET) under the Embark Initiative and in part by the NUI Galway, Thomas Crawford Hayes Trust Fund. The authors acknowledge support of the HEA under PRTLI4 for licensing OSI Digital Imagery through the Ryan Institute, NUI Galway. Ordinance Survey Ireland data is included under OSi licence number NUIG220212. Unauthorised reproduction infringes Ordinance Survey Ireland and Government of Ireland copyright. © Ordinance Survey Ireland, 2013. The authors acknowledge the Office of Public Works (OPW) and Electricity Supply Board (ESB) for providing river level data. The authors also acknowledge BirdWatch Ireland for providing assistance. The authors offer very special thanks to the farmers of the callows, for allowing access to their land, giving generously of their time and providing information on their farming practice. We are also grateful to Noel Bugler, David Gowing, Stephen Heery, and Christopher Williams for their help and advice during the research and to two reviewers for their very helpful and constructive comments on an earlier MS.

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Correspondence to Caitriona Maher.

Appendix

Appendix

Table 7 Occasional species belonging to Constancy table (Table 3) for plant relevés
Table 8 Mean environmental variable values and species characteristics for each vegetation sub-group (see Table 3)
Table 9 Species codes and full Latin names

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Maher, C., Sheehy Skeffington, M. & Gormally, M. Hydroperiod and Traditional Farming Practices Drive Plant Community Composition on Unregulated Atlantic Floodplain Meadows. Wetlands 35, 263–279 (2015). https://doi.org/10.1007/s13157-014-0616-0

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