Assessing the potential invasiveness of Cortaderia selloana in Sardinian wetlands through seed germination study / Gianluigi Bacchetta in Plant Biosystems, vol. 144, n°3 (Année 2010)

Public [article]  inPlant Biosystems > vol. 144, n°3 (Année 2010) . - pp. 518-527 Titre : Assessing the potential invasiveness of Cortaderia selloana in Sardinian wetlands through seed germination study Type de document : Livre Auteurs : Gianluigi Bacchetta, Auteur ; C. A. Dettori, Auteur ; Francesco Mascia, Auteur ; F. Meloni, Auteur ; Lina Podda, Auteur Année de publication : 2010 Article en page(s) : pp. 518-527 Langues : Anglais Catégories : [Espèces (in biblio)] Cortaderia selloana (Schult. & Schult.f.) Asch. & Graebn. [habitats/milieux] ZH - Zones humides [Thèmes] Herbe de la pampa Mots-clés : germination  écologie  plante invasive  salinité Résumé : "The present work is focused on the study of abiotic factors that may favour seed germination and the potential invasiveness of Cortaderia selloana, with particular attention to wetlands. Germination tests were conducted at the Sardinian Germplasm Bank (BG‐SAR), testing different temperatures and percentages of NaCl in order to determine the optimal ecological conditions at which germination occurs and the effect of salt on seed germination and viability, as well as on seedling development. Seeds completely germinated at every temperature tested, but the highest germination rate was found at 25°C. Salinity did not prevent seeds from germinating, but it affected germination rate and seedling vigour." (source : auteurs) Type de publication : périodique Référence biblio : Bacchetta G., Dettori C.-A., Mascia F., Meloni F., Podda L., 2010 - Assessing the potential invasiveness of Cortaderia selloana in Sardinian wetlands through seed germination study. Plant Biosystems, 144 (3) : 518-527. ID PMB : 62683 DOI : 10.1080/11263500903403465 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=62683 [article]

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Cortaderia selloana seed germination under different ecological conditions / Roser Domènech in Acta Oecologica, vol. 33, n°1 (Année 2008)

Public [article]  inActa Oecologica > vol. 33, n°1 (Année 2008) . - pp. 93-96 Titre : Cortaderia selloana seed germination under different ecological conditions Type de document : Livre Auteurs : Roser Domènech, Auteur ; Vilà Montserrat, Auteur Année de publication : 2008 Article en page(s) : pp. 93-96 Langues : Français Catégories : [Espèces (in biblio)] Cortaderia selloana (Schult. & Schult.f.) Asch. & Graebn. [Thèmes] Herbe de la pampa Mots-clés : plante exotique  test de germination  lumière  gradient de texture du sol Résumé : "Biological invasions are causing the extinction of native species and modifying ecosystem functions. Invasion success depends, among other factors, on the biological attributes of the invaders and the abiotic characteristics of the recipient community. Cortaderia selloana is a gynodioecious perennial grass native to South America which is considered invasive worldwide. It is known that seedlings of this species tolerate a wide range of environmental conditions. However, the abiotic factors that may favour its seed germination have not been studied in much detail. For this reason, we conducted an array of germination tests with different degrees of shading, soil textures and water availability. Although C. selloana usually grows in disturbed sites where light is highly available, we found that seed germination was higher under shaded conditions than under 100% light. Seed germination was higher in sandy soil textures and decreased in soils which contained increased levels of clay. Mature C. selloana plants have been reported to tolerate water stress, yet we found that the shortage of water availability constrained seed germination to approximately 60%. Overall, C. selloana seeds seem to germinate under a wide range of environmental conditions, yet germination rate can be improved under shading, high levels of sand and with high water availability." (source : auteurs) Type de publication : périodique Référence biblio : Domènech R., Montserrat V., 2008 - Cortaderia selloana seed germination under different ecological conditions. Acta Oecologica, 33 (1) : 93-96. ID PMB : 62684 DOI : 10.1016/j.actao.2007.09.004 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=62684 [article]

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The expansion history of a sexual and asexual species of Cortaderia in California, USA / John Lambrinos in Journal of Ecology, vol. 89, n°1 (Année 2001)

Public [article]  inJournal of Ecology > vol. 89, n°1 (Année 2001) . - pp. 88-98 Titre : The expansion history of a sexual and asexual species of Cortaderia in California, USA Type de document : Livre Auteurs : John Lambrinos, Auteur Année de publication : 2001 Article en page(s) : pp. 88-98 Langues : Anglais Catégories : [Espèces (in biblio)] Cortaderia selloana (Schult. & Schult.f.) Asch. & Graebn. [Thèmes] Herbe de la pampa Mots-clés : évolution  histoire  consanguinité  plante envahissante Résumé : "The expansion histories of two South American species of Cortaderia, similar in morphology but differing profoundly in their breeding systems, were compared in California, USA. Both species were introduced to California in the mid-1800s, but herbarium records indicate that the sexual C. selloana has expanded spatially at twice the rate of the asexual C. jubata. The invasiveness of C. selloana has increased over time, whereas that of C. jubata has remained relatively constant. Populations of C. selloana now occupy more vegetation types and more non-ruderal habitats than C. jubata. Populations of C. selloana have experienced directional morphological change, whereas the morphology of C. jubata has been constant over the 90 years for which preserved specimens are available. The invasion of an alien species appears to be a malleable process, rather than a singular event. Species traits, such as inbreeding, can be advantageous at some stages but disadvantageous at others. Alien species also adjust over time to the novel and diverse selective regimes that they encounter as they expand spatially. Sexual species may have a greater ability to adjust to diverse selective landscapes relative to asexual species." (source : auteur) Type de publication : périodique Référence biblio : Lambrinos J., 2001 - The expansion history of a sexual and asexual species of Cortaderia in California, USA. Journal of Ecology, 89 (1) : 88-98. ID PMB : 62685 DOI : 10.1046/j.1365-2745.2001.00524.x Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=62685 [article]

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Wind effects on dispersal patterns of the invasive alien Cortaderia selloana in Mediterranean wetlands / S. Saura-Mas in Acta Oecologica, vol. 27, n°2 (Année 2005)

Public [article]  inActa Oecologica > vol. 27, n°2 (Année 2005) . - pp. 129-133 Titre : Wind effects on dispersal patterns of the invasive alien Cortaderia selloana in Mediterranean wetlands Type de document : Livre Auteurs : S. Saura-Mas, Auteur ; F. Lloret, Auteur Année de publication : 2005 Article en page(s) : pp. 129-133 Langues : Anglais Catégories : [Espèces (in biblio)] Cortaderia selloana (Schult. & Schult.f.) Asch. & Graebn. [habitats/milieux] ZH - Zones humides [Thèmes] Bassin méditerranéen [Thèmes] Herbe de la pampa Mots-clés : ombre des semences  anémochorie  dissémination des graines Résumé : "Dispersal and establishment of recruits are key steps in the seed invasion process of alien plants. We analysed the effects of wind on the dispersal pattern of Cortaderia selloana, an invasive alien tussock grass in the wetlands of the Mediterranean basin. C. selloana dispersal curves (with QDx values, it is seed density at a given distance from the focal plant) for the four orientations north, east, south, and west, fitted well with exponential negative functions. Strong northern winds had a significant effect on the seed dispersal of C. selloana, so we found a greater number of seeds in the southward focal plants. This wind-orientation effect was found at relatively short distances (from 1 to 20 m), whereas no significant differences were found in orientations at 30 or more meters from the focal plants probably due to the seeds’ decreasing ability to remain in the air. The spatial distribution of recruits showed a similar pattern to that of the seed dispersal, with more recruits in a south orientation. This study demonstrates that wind is a notable factor determining invasive patterns of an anemochorous invasive species such as C. selloana at a local scale. This effect scales up from the dispersal phase to the seedling recruitment stages." (source : auteurs) Type de publication : périodique Référence biblio : Saura-Mas S., Lloret F., 2005 - Wind effects on dispersal patterns of the invasive alien Cortaderia selloana in Mediterranean wetlands. Acta Oecologica, 27 (2) : 129-133. ID PMB : 62686 DOI : 10.1016/j.actao.2004.12.001 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=62686 [article]

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