EFFETS DE L’ARBUSTE ENVAHISSANT RHODODENDRON PONTICUM L. SUR QUELQUES ESPECES INDIGENES DE L’ILE DE RÙM (ÉCOSSE DU NORD-OUEST)

Abstract : Effects of the invasive shrub Rhododendron ponticum L. on some native species on Rùm Island (Northwest Scotland).-In 1763, the shrub Rhododendron ponticum L. has been introduced on the British Isles for its ornamental value. The species is currently naturalized in many islands and is considered as one of the most invasive species of Great Britain. This study highlights the effects of Rhododendron ponticum on some native species on the Isle of Rùm (Northwest Scotland, Great Britain) in the frame of reforestation programs with native woody species. We compared plant diversity, species richness, abundance, and diversity indices in (1) 100 m² plots located in both invaded and not invaded heathlands by Rhododendron ponticum, and (2) under thickets of either Ilex aquifolium (indigenous species) or Rhododendron ponticum (invasive species) in understory environment. Our results show that plant diversity decreases with Rhododendron ponticum establishment and particularly for Dryopteris dilatata and Dryopteris filix-mas in the understory. Plots invaded by Rhododendron ponticum have lower diversity indices and these indices are greater under Ilex aquifolium thickets than those of Rhododendron ponticum in the understory. These findings lead us to consider that Rhododendron ponticum decreases native species diversity on the Isle of Rùm. Furthermore, our results also show that the indigenous species Ilex aquifolium seems to reduce the abundance of Rhododendron ponticum in the understory environment. We suggest that Ilex aquifolium can be viewed as a key species in reforestation programs against Rhododendron ponticum invasion on the Isle of Rùm.
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Arthur Messerli, Sébastien Larrue. EFFETS DE L’ARBUSTE ENVAHISSANT RHODODENDRON PONTICUM L. SUR QUELQUES ESPECES INDIGENES DE L’ILE DE RÙM (ÉCOSSE DU NORD-OUEST). Revue d'Ecologie, Terre et Vie, Société nationale de protection de la nature, 2015. ⟨hal-01953334⟩

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