Regeneration and colonization abilities of the invasive species Elodea canadensis and Elodea nuttallii under a salt gradient: implications for freshwater invasibility
Salinity plays an important role in macrophyte distribution. The current increase in salinization of native freshwaters could modify their susceptibility to invasion. In this study, we determined the tolerance to salt of two invasive macrophytes: Elodea canadensis and Elodea nuttallii. We analysed their growth, regeneration and colonization abilities and the influence of their phenological stage in their response to salt in a laboratory experiment. Traits of both Elodea species varied according to the season and the salt concentration: they were more affected by salt in autumn than in spring, demonstrating higher salt tolerance in spring than in autumn. The two species were sensitive to different thresholds of salinity, although they were both strongly reduced at 3 g l−1 of salt in autumn. Consequently, salt marshes and brackish waters (salt concentration inferior to 3 g l−1 of salt) are likely to be invaded by both species, but the effect of salt levels superior to 3 g l−1 on plant invasiveness needs to be investigated.
KeywordsBiological invasion Invasiveness Aquatic plants Salinity Traits
We thank Philippe Rousselle for performing the water analysis and Philippe Wagner for field assistance.
- de Oliveira, A. B., N. L. M. Alencar & E. Gomes-Filho, 2013. Comparison between the water and salt stress effects on plant growth and development. In Akinci, S. (ed.), Responses of Organisms to Water Stress. InTech, Rijeka.Google Scholar
- Hauenstein, E. & C. Ramírez, 1986. The influence of salinity on the distribution of Egeria densa in the Valdivia river basin, Chile. Archiv für Hydrobiologie 107(4): 511–519.Google Scholar
- Hutchinson, G. E., 1975. A Treatise on Limnology, Vol. III. Limnological Botany. Wiley, New York: 660 pp.Google Scholar
- May, M. J., T. Vernoux, C. Leaver, M. Van Montagu & D. Inzé, 1998. Glutathione homeostasis in plants: implications for environmental sensing and plant development. Journal of Experimental Botany 49(321): 649–667.Google Scholar
- Petjukevičs, A., A. Batjuka & N. Škute, 2015. The impact of different levels of sodium chloride on the quantitative changes of chlorophyll and carotenoids in chloroplasts of Elodea canadensis (Michx. 1803). Biology 61(1): 34–41.Google Scholar
- Thiébaut, G., S. Muller & M. Tremolières, 2008. Etude comparative de deux espèces végétales aquatiques invasives en France: Elodea nuttallii et E. canadensis. Stratégies adaptatives, facteurs écologiques, polymorphisme génétique des espèces. Contribution au contrôle du phénomène invasif.Google Scholar
- Zimmermann-Timm, H., 2007. Salinisation of inland waters. In Lozan, J., H. Grssl, P. Hupfer, L. Menzel & C. Schönwiese (eds), Water Uses and Human Impacts on the Water Budget. Verlag Wissenschaftliche Auswertungen/GEO, Hamburg: 133–136.Google Scholar