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Ajouter le résultat dans votre panierAllelopathic invasive tree (Rhamnus cathartica) alters native plant communities / Robert J. Warren in Plant ecology, vol. 218, n°10 (Septembre 2017)
Titre : Allelopathic invasive tree (Rhamnus cathartica) alters native plant communities Type de document : texte imprimé Auteurs : Robert J. Warren, Auteur ; Adam C. Labatore, Auteur ; Marco M. Candeias, Auteur Année de publication : 2017 Article en page(s) : pp. 1233-1241 Langues : Anglais (eng) Résumé : "Many plants release allelopathic chemicals that can inhibit germination, growth, and/or survival in neighboring plants. These impacts appear magnified with the invasion of some non-native plants which may produce allelochemicals against which native fauna have not co-evolved resistance. Our objective was to examine the potential allelopathic impact of an invasive non-native shrub/tree on multiple plant species using field observation and experimental allelopathy studies. We surveyed and collected an invasive, non-native tree/shrub (Rhamnus cathartica) at Tifft Nature Preserve (a 107-ha urban natural area near Lake Erie in Buffalo, NY). We also surveyed understory plant communities in the urban forest to examine correlations between R. cathartica abundance and local plant community abundance and richness. We then used experimental mesocosms to test if patterns observed in the field could be explained by adding increased dosages of R. cathartica to soils containing five plant species, including native and non-native woody and herbaceous species. In the highly invaded urban forest, we found that herbaceous cover, shrubs and woody seedlings negatively covaried with R. cathartica basal area and seedlings density. In the mesocosm experiments, R. cathartica resulted in significant decreases in plant community species richness, abundance, and shifted biomass allocation from roots. Our results provide evidence that R. cathartica is highly allelopathic in its invaded range, that R. cathartica roots have an allelopathic effect and that some plant species appear immune. We suggest that these effects may explain the plant’s ability to form dense monocultures and resist competitors, as well as shift community composition with species-specific impacts." Type de publication : périodique Référence biblio : Warren R., Labatore A., Candeias M., 2017 - Allelopathic invasive tree (Rhamnus cathartica) alters native plant communities. Plant ecology, 218 (10) : 1233-1241. DOI : 10.1007/s11258-017-0766-2 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65878
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Titre : Measuring succession : methods for establishing long-term vegetation monitoring sites Type de document : texte imprimé Auteurs : Merilynn Schantz, Auteur ; Erin Espeland, Auteur ; Sara Duke, Auteur Année de publication : 2017 Article en page(s) : pp. 1201-1212 Langues : Anglais (eng) Mots-clés : communauté végétale succession végétale espèce végétale envahissante suivi à long terme modélisation caractérisation de la végétation Résumé : "Successional stages are often characterized by dominant plant species (species with the highest cover) and their effect on the structure and function of an area through time. However, the plant species determining the ecosystem properties and plant community dynamics may not be the dominant, especially when it is exotic. Understanding plant community dynamics in ecosystems that are uncharacterized and/or affected by invasive plant species requires a data-driven approach and proper placement of monitoring plots. To generate robust datasets on vegetation change through time, monitoring plot placement must consider the scale of ecological variation for both vegetation and soils and plots would ideally be replicated within similar ecological site types to quantify the consistency of successional transitions. We characterized soil and vegetation across and within seven floodplains affected by Russian olive (Elaeagnus angustifolia L.) along the Yellowstone River in southeastern Montana, USA. Using modern Classification and Regression Trees (CART) and multivariate net differentiation, we identified five distinct plant community types, or classes, characterized by their tertiary woody plant cover, not the primary species, Russian olive. Our findings indicate that Russian olive communities differ across space, and these riparian areas can be classified into distinct plant community types. Characterizing plant community types via this analytical approach should allow practitioners to modify management decisions and forecast succession within relevant plant communities." (source : auteurs) Type de publication : périodique Référence biblio : Schantz M., Espeland E., Duke S., 2017 - Measuring succession : methods for establishing long-term vegetation monitoring sites. Plant ecology, 218 (10) : 1201-1212. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65879
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