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Título

Response of the invader Cortaderia selloana and two coexisting natives to competition and water stress

AutorDomènech, Rosa; Vilà, Montserrat CSIC ORCID
Palabras claveBrachypodium phoenicoides
Alien plants
Festuca arundinacea
Intra- and interspecific competition
Perennial grasses
Relative interaction index
SLA
Root–shoot ratio
Fecha de publicación2008
EditorSpringer Nature
CitaciónBiological invasions (2008) 10:903–912
ResumenAlien species’ resistance and adjustment to water stress and plant competition might largely determine the success of invasions in Mediterranean ecosystems because water availability is often limit- ing biomass production. Two outdoor pot experiments were conducted to test the hypotheses that at the recruitment stage the invader perennial tussock grass Cortaderia selloana is a superior competitor, and that it is more resistant to water stress than the two coexisting native species of the same functional group, Festuca arundinacea and Brachypodium phoe- nicoides. C. selloana reduced aboveground biomass of target native species, but not more than target native species on each other. Moreover, C. selloana did not resist interspecific competition more than target native species. Under control conditions, C. selloana did not have larger specific leaf area (SLA) and root–shoot ratio (R/S) ratio than target native species, contradicting the general statement that these traits are associated to invasiveness. F. arundinacea was the species which performed best but also the one most affected by water stress. Both C. selloana and B. phoenicoides performed in a similar way under water stress conditions. However, the alien species’ capacity to adjust to water stress, indicated by the increase in the root–shoot ratio under moderate and severe water stress, was slightly better than that of B. phoenicoides. Overall, at early recruit- ment stages, C. selloana is not a better competitor than the coexisting native species. However, it seems to be more resistant to water stress because as water becomes scarce C. selloana maximizes water uptake and minimizes water losses more than the native species
Versión del editorhttp://dx.doi.org/10.1007/s10530-008-9243-0
URIhttp://hdl.handle.net/10261/54745
DOI10.1007/s10530-008-9243-0
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