B000042: mudanças entre as edições

|ind2=#

|data=$a Abstract: Studies indicate that non-native species (especially those considered invasive) can directly influence the biodiversity, structure and functioning of ecosystems, besides to potentially causing economic impacts. In forested streams (≤ 3rd order), specifically, studies indicate that the presence of non-native and non-native invasive tree and/or shrub species in riparian vegetation can affect the functioning of these ecosystems. In this context, this Thesis objectives to evaluate the influence of the presence of non-native and non-native invasive tree and/or shrub species in riparian vegetation on the functioning of streams. For this, I used i) a experimental approach, in Chapters I and II, where I evaluated the influence of Hovenia dulcis Thunb. (Rhamnaceae) – a non-native and invasive tree species with wide occurrence in southern Brazil - on the functioning of subtropical streams and; ii) a theoretical approach, in Chapter III, where I carried out a scientometric study. In Chapter I, I evaluated the effect of the phenology of H. dulcis on the annual temporal pattern and the allochthonous litterfall input into subtropical streams with and without the presence of this species in riparian vegetation. I found that the presence of H. dulcis in riparian vegetation, when at high densities, is capable of change the temporal pattern and the seasonal allochthonous litterfall input into streams, making the input of allochthonous litterfall high in the summer-autumn transition months. In Chapter II, I evaluated the effect of H. dulcis leaves, offered individually and associated with a mixture of native species, on leaf decomposition and on the aquatic invertebrate community in three subtropical streams of the Atlantic Forest. I found that H. dulcis leaves individually available had the highest decomposition and the highest associated invertebrate densities among the foliar treatments. The association with H. dulcis leaves, however, did not change leaf decomposition and the structure and composition of the invertebrate community associated with the leaves of native species. In Chapter III, I performed a scientometric analysis to assess the main trends in publications approaching the effects of non-native and non-native invasive tree and/or shrub species on leaf decomposition and the communities of microorganisms and aquatic invertebrates in streams. Among 127 papers published from 1981 to 2020, I found that: i) the theme 'decomposition' was approached in ~64% of the papers, 'microorganisms' in ~24% and 'invertebrates' in ~81%; ii) these articles were published in 57 journals; iii) 29 countries had studies developed in their territory; iv) 89 non-native and non-native invasive tree and/or shrub species were evaluated; v) 4 spatial scales of comparison (from leaves to streams) were recorded and vi) different metrics were used to assess 'decomposition' (n=3), 'microorganisms' (n=9) and 'invertebrates' (n=18). This Thesis can contribute, first, with the existing knowledge about the effects of the presence of H. dulcis in riparian vegetation on the dynamics of allochthonous litterfall input, the leaf decomposition and the structure and composition of aquatic invertebrate communities in subtropical streams and, second, in a broad ecological context, with the existing knowledge about the influence of the presence of non-native species (especially those considered invasive) in the riparian vegetation of streams on the functioning of these ecosystems.

}}

{{EndOfRecord}}