Abstract
Non-native Spartina spp. have invaded many coastal saltmarshes worldwide. Introduced Spartina may cause problems like displacement of native vegetation and hybridisation with native species, leading to changes to relevant ecosystem services and saltmarsh geomorphology. Here we report the extensive and so far overlooked replacement of the native Spartina maritima by non-native S. anglica and S. townsendii along 400 km of the coast of the north-western Adriatic Sea (Mediterranean Sea). We analysed the distribution of both native and non-native Spartina spp. along the six main saltmarsh areas in the region, and produced maps of their presence by using a combination of genetic tools, morphological analysis and geotagged photographs, complemented with field observations. We also reviewed historical herbaria from the region to explore when the first non-native introductions could have occured. We found that S. anglica and S. townsendii are unexpectedly widespread, having established along the whole study region, in one lagoon totally replacing the local native species. Its introduction happened virtually unnoticed, and misidentified herbarium specimens date back as early as 1987. We discuss the ecological implications of this overlooked extensive replacement, and the need for a comprehensive assessment of the status of the saltmarshes in this region, both to protect the few remaining patches of the native S. maritima and control the spread of the non-native species across the Mediterranean Sea.
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Acknowledgements
We thank Dr. Filippo Piccoli, the Orto Botanico ed Erbario di Ferrara and the Orto Botanico di Padova for their kind assistance and providing access to historical herbarium samples. For their help in the field and laboratory work, we are very thankful to Elena Piccioni, Giovanni Nobili and the Corpo Forestale dello Stato Emilia Romagna. Thanks also goes to Veronica Lo for access to photographs, to Nico De Storme for help in lab analyses and to Malika Ainouche for general advice and guidance. This research was funded by the Erasmus Mundus MARES Ph.D. Programme (FPA 2011-0016), and by project TETRIS—Observing, modelling and Testing synergies and TRade-offs for the adaptive management of multiple Impacts in coastal Systems (PRIN 2010–2011 grant 2010PBMAXP_003, Italian Ministry of Education, University and Research).
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Wong, J.X.W., Costantini, F., Merloni, N. et al. The widespread and overlooked replacement of Spartina maritima by non-indigenous S. anglica and S. townsendii in north-western Adriatic saltmarshes. Biol Invasions 20, 1687–1702 (2018). https://doi.org/10.1007/s10530-017-1654-3
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DOI: https://doi.org/10.1007/s10530-017-1654-3