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Interactions of the water primrose with other invasive macrophyte species and two native species

Abstract : The success of invasive species has been attributed to the ability to displace other species by direct competition. We studied possible interactions between three South American species (Ludwigia grandiflora, Egeria densa, Myriophyllum aquaticum) and two European plant species (Ceratophyllum demersum, Mentha aquatica). The three exotic species are currently in expansion phase in European freshwaters. Ludwigia grandiflora (the water primrose) and Myriophyllum aquaticum occur in their emerged growth form in dense stands and in their submerged shoots. In this study, we investigate the growth of the six species in monoculture and in mixed spatial pattern. The experiments were conducted in containers placed in greenhouse during one month in spring 2011. The Relative Growth Rate (RGR) was measured and the competitive abilities of each species were determined. The RGR of the water primrose was higher when it was in the presence of Myriophyllum aquaticum and Mentha aquatica than on the presence of Ceratophyllum demersum and Egeria densa. A dense stand of Ludwigia grandiflora stimulated the growth of Egeria densa. The growth characteristics of Ludwigia grandiflora, of Myriophyllum aquaticum and Egeria densa species can explain their coexistence in ponds and in streams and the water primrose dynamic. No direct competition was established between the three species coming from the same biogeographical range.
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Conference papers
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https://hal.inrae.fr/hal-02747131
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Submitted on : Wednesday, June 3, 2020 - 11:25:33 AM
Last modification on : Friday, July 16, 2021 - 10:20:02 AM

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  • HAL Id : hal-02747131, version 1
  • PRODINRA : 295407

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Gabrielle Thiebaut, Camille Puech, Lise Thouvenot, F. Martínez, F. Rozé. Interactions of the water primrose with other invasive macrophyte species and two native species. 2. World Conference on Biological Invasions and Ecosystem Functioning, Nov 2011, Mar del Plata, Argentina. ⟨hal-02747131⟩

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