Impact of invasive grasses on Cerrado under natural regeneration

dc.contributor.authorDamasceno, Gabriella [UNESP]
dc.contributor.authorSouza, Lara
dc.contributor.authorPivello, Vânia R.
dc.contributor.authorGorgone-Barbosa, Elizabeth [UNESP]
dc.contributor.authorGiroldo, Paula Z.
dc.contributor.authorFidelis, Alessandra [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversity of Oklahoma
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.description.abstractCerrado is the Brazilian neotropical savanna threatened by invasive African grasses. We aimed to quantify the impact of invasive Melinis minutiflora and Urochloa brizantha on the cover of different functional groups (native graminoids, forbs, shrubs) and the structure (bare soil and the cover of natives’ and invasives’ dead biomass) of regenerating plant communities. We hypothesized that the impact of invasives would be negative and more pronounced in the rainy period, given the great influence of seasonality in savannas. In three community types (non-invaded, invaded by M. minutiflora and invaded by U. brizantha) we evaluated the cover of functional groups and structural components by sampling 120 1 m × 1 m plots, four times a year. Using the Cohen’s D impact index, we showed that both invasive species reduced the cover of all native functional groups, decreased bare soil and increased total dead cover. Greatest effects occurred when M. minutiflora was present. M. minutiflora’s impact on total graminoids varied from positive in the Early-Dry season to negative in the Mid-Dry season, while the negative impact of U. brizantha on bare soil became more pronounced from the dry to the rainy season. Differences in the impacts caused by the invasive species are probably due to the large biomass produced by M. minutiflora versus the fast colonization and soil occupancy by U. brizantha. Overall, invaded versus non-invaded communities differed in structure, as well as both invaded communities differed from each other. Our results demonstrate the need to control these species for conservation and restoration of Cerrado ecosystems.en
dc.description.affiliationLaboratory of Vegetation Ecology Instituto de Biociências Universidade Estadual Paulista (UNESP), Rio Claro. Av. 24A, 1515
dc.description.affiliationOklahoma Biological Survey & Department of Microbiology and Plant Biology University of Oklahoma, 111 E. Chesapeake Street
dc.description.affiliationDepartamento de Ecologia Universidade de São Paulo, Rua do Matão, Trav. 14, 321
dc.description.affiliationUnespLaboratory of Vegetation Ecology Instituto de Biociências Universidade Estadual Paulista (UNESP), Rio Claro. Av. 24A, 1515
dc.identifier.citationBiological Invasions.
dc.relation.ispartofBiological Invasions
dc.rights.accessRightsAcesso aberto
dc.subjectBiodiversity conservation
dc.subjectCommunity restoration
dc.subjectMelinis minutiflora
dc.subjectNeotropical savanna
dc.subjectUrochloa brizantha
dc.titleImpact of invasive grasses on Cerrado under natural regenerationen


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