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Wetlands

, Volume 33, Issue 3, pp 527–535 | Cite as

Germination Responses of the Invasive Triadica sebifera and Two Co-occurring Native Woody Species to Elevated Salinity Across a Gulf Coast Transition Ecosystem

  • Shishir PaudelEmail author
  • Loretta L. Battaglia
Article

Abstract

With sea level rise, coastal ecosystems farther inland are expected to experience extended duration of inundation and elevated salinity. However, the effects of elevated salinity on initial recruitment of native and invasive woody species in coastal ecosystems are poorly understood. We assessed effects of elevated salinity across a range of soil types on germination of the invasive Triadica sebifera and two natives, Baccharis halimifolia and Morella cerifera, using growth chamber and greenhouse experiments. In both studies, germination was compared across four salinity levels (0, 10, 20, and 30 g/l). In the greenhouse, percent germination of these species was also compared across soils spanning the five dominant vegetation zones that define a typical coastal transition ecosystem in coastal Mississippi, USA. Final percent germination of all species decreased with increased salinities in both experiments. In the greenhouse, germination of all species was reduced in soils from the most seaward vegetation zones. Overall, there were species-specific germination responses to salinity treatments and soil types. Of the three species, B. halimifolia was least sensitive to increasing salinity. Germination of the invasive Triadica sebifera did not differ across salinity levels in inland soils, displaying plasticity of germination traits. This plasticity may increase the likelihood of successful germination under some degree of salinity stress, and thereby contribute to the inland spread of T. sebifera along coastal transition ecosystems.

Keywords

Global Climate Change Coastal Ecosystems Invasion Sea Level Rise Saltwater Intrusion Soils 

Notes

Acknowledgements

We thank Jerrod Looft and Hannah Kalk for their assistance in the field and greenhouse, Dr. J. Groninger and Dr. D.R. Tindall for providing pots and access to the growth chamber, respectively, and the staff of the Plant Biology greenhouse at Southern Illinois University Carbondale for assistance with the greenhouse experiment. We also thank GBNERR and Dr. M.S. Woodrey for logistical support at the reserve. We are grateful to Dr. David Gibson, Dr. John Groninger, all members of the Battaglia lab, the Associate Editor, and three anonymous reviewers for their insightful suggestions and helpful criticisms of an earlier version of the manuscript.

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Copyright information

© Society of Wetland Scientists 2013

Authors and Affiliations

  1. 1.Department of Plant Biology, Center for EcologySouthern Illinois University CarbondaleCarbondaleUSA

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