Otávio Miranda Verly, Antonio Miguel Olivo-Neto, Carlos Alberto Ramos Domiciano, Indira Bifano Comini, Simone Silva, Carlos Moreira Miquelino Eleto Torres, Maria Paula Miranda Xavier Rufino, Laiz de Oliveira Sartori, Reginaldo Antonio Medeiros
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引用次数: 0
Abstract
Alien species pose a potential threat to biodiversity, necessitating vigilant monitoring to inform effective control strategies and prevent their invasiveness. The primary objective of this study was to evaluate the impact of alien species on the richness, horizontal structure, and diversity of the tree–shrub layer within a Cerrado-Pantanal transition region fragment. A floristic census was conducted across a fragment of approximately 3.0 ha, measuring all individuals with an aboveground diameter (DAG) ≥ 5.0 cm. The study assessed the statistical significance of diversity variation in the presence and absence of alien species using the Hutcheson t-test and examined the correlation between the proportion of alien species and various community parameters through Pearson’s correlation. The findings revealed a total of 84 species belonging to 34 families, with a total of 2218 recorded individuals. Notably, eight species (9.52%) were identified as alien, distributed across five families. Among the alien species, Leucaena leucocephala (Lam.) de Wit exhibited the highest importance value. However, the analysis indicated that the presence of alien species did not yield a significant variation in diversity, as demonstrated by the applied test with a 5.0% probability level, at both the plot and community levels. Moreover, the correlation analysis indicated that the community variables exhibited a low association with the proportion of individuals belonging to alien species. Specifically, the correlation decreased in the following order: Shannon–Weaver Diversity Index, density of native species, basal area of native species, and richness of native species. The observed low correlation coefficients (r) and nonsignificant p-values (p < 0.05) suggested that the presence of alien species did not exert a significant influence on the richness, structure, and diversity of the tree–shrub layer within the studied fragment. This outcome was likely facilitated by the absence of dominant populations of alien species. Thus, the study concludes that, at least within this specific context, alien species do not exert a significant influence on the assessed community parameters.
期刊介绍:
The Brazilian Journal of Botany is an international journal devoted to publishing a wide-range of research in plant sciences: biogeography, cytogenetics, ecology, economic botany, physiology and biochemistry, morphology and anatomy, molecular biology and diversity phycology, mycology, palynology, and systematics and phylogeny.
The journal considers for publications original articles, short communications, reviews, and letters to the editor.
Manuscripts describing new taxa based on morphological data only are suitable for submission; however information from multiple sources, such as ultrastructure, phytochemistry and molecular evidence are desirable.
Floristic inventories and checklists should include new and relevant information on other aspects, such as conservation strategies and biogeographic patterns.
The journal does not consider for publication submissions dealing exclusively with methods and protocols (including micropropagation) and biological activity of extracts with no detailed chemical analysis.