SACCONE, Patrick; PAGÈS, Jean-Philippe; GIREL, Jacky; BRUN, Jean-Jacques; MICHALET, Richard

doi:10.1111/j.1469-8137.2010.03289.x

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SACCONE, Patrick
Ecosystèmes montagnards [UR EMGR]
Laboratoire d'Ecologie Alpine [LECA]

PAGÈS, Jean-Philippe
Ecosystèmes montagnards [UR EMGR]

GIREL, Jacky
Laboratoire d'Ecologie Alpine [LECA]

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Article de revue

Ce document a été publié dans

New Phytologist. 2010, vol. 187, n° 3, p. 831-842

Wiley

Résumé en anglais

• Here, we analysed the role of direct and indirect plant interactions in the invasion process of Acer negundo along a natural successional gradient in the Middle Rhone floodplain (France). We addressed two questions: What are the responses of the invasive Acer seedlings to native communities’ effects along the successional gradient? What are the effects of the invasive Acer adult trees on the native communities? • In the three communities (Salix, Acer and Fraxinus stands) we transplanted juveniles of the invasive and juveniles of the natives within the forest and in experimental gaps, and with and without the herb layer. We also quantified changes in understory functional composition, light, nitrogen and moisture among treatments. • Acer seedlings were directly facilitated for survival in the Salix and Acer communities and indirectly facilitated for growth by adult Acer through the reduction of the abundance of highly competitive herbaceous competitors. • We conclude that direct facilitation by the tree canopy of the native pioneer Salix is very likely the main biotic process that induced colonization of the invasive Acer in the floodplain and that indirect facilitation by adult conspecifics contributed to population establishment.< Réduire

Mots clés

FACILITATION

INDIRECT FACILITATION

INVASION

FORÊT RIPICOLE

FACILITATION INDIRECTE

INTERACTION BIOTIQUE

Mots clés en anglais

ACER NEGUNDO

COMPETITION

FOREST SUCCESSION

RIPARIAN FORESTS

ERABLE PANACHE