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Achene buoyancy and germinability of the terrestrial invasive Fallopia x bohemica in aquatic environment: A new vector of dispersion?

Soraya Rouifed 1 Sara Puijalon 1 Marie-Rose Viricel 1 Florence Piola 1
1 Écologie Végétale et Zones Humides
LEHNA - Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés
Abstract : Seed dispersal along watercourses can favour the long-distance migration of invasive species, not only for aquatic or wetland species, but also for terrestrial wind-dispersed plants. It is crucial to investigate the role of watercourses in the dispersal of the knotweed hybrid complex (Fallopia x bohemica) due to its frequent occurrence on riverbanks and production of fertile achenes. For this purpose, we experimentally studied buoyancy and germinability of F. x bohemica achenes in stirred water, over 28 d. We also measured the long-term survival and growth of seedlings according to exposure time to water. After nearly 2 d in the water, 50% of achenes were still afloat. After 3 d, germination occurred in water and the seedlings also floated. Moreover, the exposure of achenes to water, for however long, significantly favoured their germination rate, without affecting seedling survival, compared to a direct planting in soil. Furthermore, a maximum seedling dry mass was reached following exposure to water for 277 h (11.5 d), surpassing significantly the dry mass of seedlings planted directly in soil. Water exposure strongly favours achene germination and seedling survival. Our results demonstrate a high potential for the seeds and seedlings of Fallopia to be dispersed successfully by water.
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https://hal.archives-ouvertes.fr/halsde-00593185
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Submitted on : Friday, May 13, 2011 - 3:10:23 PM
Last modification on : Saturday, December 18, 2021 - 3:59:59 AM

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Soraya Rouifed, Sara Puijalon, Marie-Rose Viricel, Florence Piola. Achene buoyancy and germinability of the terrestrial invasive Fallopia x bohemica in aquatic environment: A new vector of dispersion?. Ecoscience, Ecoscience, 2011, 18 (1), pp.79-84. ⟨10.2980/18-1-3397⟩. ⟨halsde-00593185⟩

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