Abstract:BackgroundEcotone has been defined as “a multi-dimensional environmentally stochastic interaction zone between ecological systems with characteristics defined in space and time, and by the strength of the interaction” (Hufkens et al. 2009). This is a known concept to define transitional zones between two or more ecological communities, ecosystems or biotic regions. Ecotone forests, dispersed in northern Brazilian Amazonia, are natural formations which have been largely affected by anthropogenic impacts, such a… Show more
“…Os nomes científicos foram corrigidos pela Brazilian Flora Species List (BRAZIL FLORA GROUP, 2015) seguindo o APG-IV (2016). A lista das espécies identificadas em cada parcela pode ser livremente acessada diretamente no Global Biodiversity Information Facility (SILVA et al, 2020) ou em Silva et al (2019). Todas as medidas biométricas realizadas entre 2016-2020, informações geográficas, taxonômicas e detalhes do inventário florestal das 129 parcelas permanentes estão disponíveis na plataforma ForestPlots (https://www.forestplots.…”
Section: Discussionunclassified
“…The scientific names were corrected using the Brazilian Flora Species List (BRAZIL FLORA GROUP, 2015), based on APG-IV (2016). The list of species identified in each plot is available free of charge from the Global Biodiversity Information Facility (SILVA et al, 2020) or Silva et al (2019). All the biometric measurements taken between 2016 and 2020, geographic and taxonomic information, and details of the forest survey conducted in the 129 permanent plots are available on the ForestPlots platform (https://www.forestplots.net/) under the codes ETA, ETB, ETC, ETD, ETE and ETF (SILVA et al, 2021).…”
Monodominance is unusual in the tropics when compared to the high diversity of tropical forests. Peltogyne gracilipes (Leguminosae) is a deciduous tree species that forms monodominant forests in the Brazilian Northern Amazon region. Initial research confirmed that P. gracilipes monodominance was associated with higher soil magnesium content, while recent studies have indicated a larger number of variables, suggesting a more complex hydro-edaphic habitat. As such, the present study aimed to describe the hydro-edaphic habitat (pedoenvironment) where P. gracilipes is monodominant. Edaphic and topographic variables (drainage proxy) were used in a forest inventory conducted in 129 sampling plots. Trees with a stem diameter greater than 10 cm were analyzed. Aboveground biomass was used as a descriptive variable of the different habitats in the study area. A total of 3041 individuals were sampled (298 P. gracilipes). Multivariate analysis demonstrated that the highest P. gracilipes abundance occurred in poorly drained (seasonal flooding) low-altitude habitats (
“…Os nomes científicos foram corrigidos pela Brazilian Flora Species List (BRAZIL FLORA GROUP, 2015) seguindo o APG-IV (2016). A lista das espécies identificadas em cada parcela pode ser livremente acessada diretamente no Global Biodiversity Information Facility (SILVA et al, 2020) ou em Silva et al (2019). Todas as medidas biométricas realizadas entre 2016-2020, informações geográficas, taxonômicas e detalhes do inventário florestal das 129 parcelas permanentes estão disponíveis na plataforma ForestPlots (https://www.forestplots.…”
Section: Discussionunclassified
“…The scientific names were corrected using the Brazilian Flora Species List (BRAZIL FLORA GROUP, 2015), based on APG-IV (2016). The list of species identified in each plot is available free of charge from the Global Biodiversity Information Facility (SILVA et al, 2020) or Silva et al (2019). All the biometric measurements taken between 2016 and 2020, geographic and taxonomic information, and details of the forest survey conducted in the 129 permanent plots are available on the ForestPlots platform (https://www.forestplots.net/) under the codes ETA, ETB, ETC, ETD, ETE and ETF (SILVA et al, 2021).…”
Monodominance is unusual in the tropics when compared to the high diversity of tropical forests. Peltogyne gracilipes (Leguminosae) is a deciduous tree species that forms monodominant forests in the Brazilian Northern Amazon region. Initial research confirmed that P. gracilipes monodominance was associated with higher soil magnesium content, while recent studies have indicated a larger number of variables, suggesting a more complex hydro-edaphic habitat. As such, the present study aimed to describe the hydro-edaphic habitat (pedoenvironment) where P. gracilipes is monodominant. Edaphic and topographic variables (drainage proxy) were used in a forest inventory conducted in 129 sampling plots. Trees with a stem diameter greater than 10 cm were analyzed. Aboveground biomass was used as a descriptive variable of the different habitats in the study area. A total of 3041 individuals were sampled (298 P. gracilipes). Multivariate analysis demonstrated that the highest P. gracilipes abundance occurred in poorly drained (seasonal flooding) low-altitude habitats (
“…Each trail is 5 km long, along which 18-29 plots were established in each one with at least a distance of 150 m between them. This sampling design aimed at capturing small-scale structural variation in tree communities of this ecotone forest (W. Silva et al, 2019b). Swamps and enclaves of savannas were not considered in this study.…”
Section: Sampling Designmentioning
confidence: 99%
“…A total of 3,040 stems (tree = 2,815; palm = 225), corresponding to 140 species (42 botanic families) were used in the analysis. Species composition by sampling plot is presented in the study of W. Silva et al (2019b), and it is also freely available in the Brazilian Biodiversity Information System (W. Silva et al, 2020).…”
Section: Forest Inventorymentioning
confidence: 99%
“…In peripheral zone of Northern Amazonia, a region encompassing much of the Brazilian state of Roraima, at the boundary with Venezuela and Guyana, the ecotone represent a wide transition area between the large Rio Branco-Rio Rupununi savanna and continuous areas of different forest types (Desjardins et al, 1996;. The continuous forest area is formed by an interaction range comprising ombrophilous forests, seasonal forests and some few enclaves of savanna dispersed on hydro-edaphic gradients (Milliken & Ratter, 1998;Carvalho et al, 2018;W. Silva et al, 2019b).…”
The structure of tree communities in tropical forests depends on environmental filters and biotic interactions such as competition and facilitation. Many ecotone forests in Northern Amazonia are intriguingly populated by tree assemblages characterized by distinct abundances of a single species, Peltogyne gracilipes (Leguminosae). It is unclear whether this pattern solely reflects environmental filters or also antagonistic interactions among species with similar habitat requirements. The aim of this study was to determine the response of species richness and composition to environmental filters, and analyze the role of P. gracilipes in structuring tree communities in ecotone forest areas of the Northern Brazilian Amazonia. We sampled 129 permanent plots along a hydro-edaphic gradient. All arboreal individuals with stem diameter ≥10 cm were measured and identified. Multiple regressions were performed to test the effects of environmental filters, and abundance of P. gracilipes on the tree species richness and composition. Species richness and composition responded to the same filters which, in turn, affected species composition directly and indirectly, through the abundance of P. gracilipes. Our results indicate that both abiotic filters and biotic interactions shape the studied tree communities. P. gracilipes can be considered an indicator species of hydro-edaphic conditions, but also is itself a driver of tree community structure.
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