Estrutura da vegetação lenhosa em dois fragmentos naturais de florestas inundáveis (impucas) no Parque Estadual do Araguaia, Mato Grosso

Barbosa, Danielle Cristine de Figueiredo; Marimon, Beatriz Schwantes; Lenza, Eddie; Oliveira, Edmar Almeida de; Maracahipes, Leandro

doi:10.1590/s0100-67622011000300009

Cited by 16 publications

(18 citation statements)

References 39 publications

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“…Our results suggest that a first fire event in Neotropical, seasonally flooded forests clearly causes greater mortality of individuals and that species loss increases gradually with increasing wildfire recurrence. For example, impuca 2 showed no signs of fire at T1 (Barbosa et al 2011), but had the highest tree mortality rate of all impucas at T2 (42%) due to a wildfire that occurred in 2008 (Maracahipes et al 2014). On the other hand, impuca 1, which was already degraded by fire at T1 (Barbosa et al 2011) and soon after this had a new record of fire (Maracahipes et al 2014), lost five plant species.…”

Section: Tablementioning

confidence: 99%

“…For example, impuca 2 showed no signs of fire at T1 (Barbosa et al 2011), but had the highest tree mortality rate of all impucas at T2 (42%) due to a wildfire that occurred in 2008 (Maracahipes et al 2014). On the other hand, impuca 1, which was already degraded by fire at T1 (Barbosa et al 2011) and soon after this had a new record of fire (Maracahipes et al 2014), lost five plant species. Effects of fire on plant mortality have also been found recently in other types of tropical forests.…”

Section: Tablementioning

confidence: 99%

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Recurrent wildfires drive rapid taxonomic homogenization of seasonally flooded Neotropical forests

et al. 2018

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SUMMARYRecent evidence has shown that most tropical species are declining as a result of global change. Under this scenario, the prevalence of tolerant species to disturbances has driven many biological communities towards biotic homogenization (BH). However, the mechanisms that drive communities towards BH are not yet thoroughly understood. We tested effects of recurring wildfires on woody species richness and composition in six seasonally flooded Amazonian forests and whether these fires reduce species composition (i.e., taxonomic homogenization) over short periods of time. Our results show that these forests are undergoing taxonomic homogenization in response to recurring fire events. Species richness decreased as a result of local extinctions and floristic similarity increased among forest communities. Fire was selecting tolerant (‘winner’) species and eliminating the more sensitive (‘loser’) species. BH leads to biodiversity erosion, which can deeply alter ecosystem processes such as productivity, nutrient cycling and decomposition, resulting in important consequences for conservation.

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Section: Tablementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

Recurrent wildfires drive rapid taxonomic homogenization of seasonally flooded Neotropical forests

et al. 2018

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“…In addition, the studies by Martins et al [14] and Barbosa et al [57] demonstrated the hydromorphism of Ipucas Gleysols, influenced by the groundwater level near the surface and surface layers characterized by acidic OM and higher surface carbon contents. Some of the nutrients, especially P, are concentrated or bound to the humic fraction at the surface.…”

Section: Discussionmentioning

confidence: 97%

Spatial Variability of the Physicochemical Properties of Soils from Seasonally Flooded Forest Fragments on a Tropical Plain

Barbosa

Fernandes

Siqueira

et al. 2019

Applied and Environmental Soil Science

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Flooded ecosystems are conditioned to seasonal floods that promote specific soil conditions, such as low oxygen, hydromorphism, and peculiar chemical reactions. These environments are dependent on flood pulses that determine specific ecological conditions. Ipucas are seasonally flooded discontinuous forest patches that occur exclusively in the Araguaia Plain in Central Brazil. They are located 0.40 to 1.20 m lower than the surrounding plain, which promotes an accumulation of rainwater for five to six months of the year, being entirely or partially dry during the dry season. The aim of this study was to evaluate the horizontal (centre and edge) and vertical (depths: 0–0.20 m and 0.20–0.40 m) variability of physicochemical parameters in Ipucas soils, attempting to establish the importance of flood pulses and the leaching of surrounding areas in soil formation and composition. Samples were collected during the dry season in three Ipucas of similar size and circularity using a Dutch auger. The results reveal that flood pulses promote the deposition of sediments eroded from the surrounding plain, homogenizing the characteristics of the surface soil, from the edge to the centre of the Ipucas. However, biogeochemical processes, also linked to temporary flooding, account for the differences between the surface and deeper soil horizons because anoxic conditions during flooding promote chemical reactions characteristic of anaerobic environments, modifying the pH and organic matter content, in addition to the gleying of soils subjected to flooding, which are then covered by sediments after the dry season. Finally, Ipucas soils are susceptible to anthropic changes and are dependent on seasonal flood pulses.

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“…Just before the wet season and prior to flooding, we selected two areas, a seasonally flooded forest (regionally called ‘impuca’) (Barbosa et al . , Maracahipes et al . ) and a non‐flooded forest, near the visitor center along the margin of the Coco River, ca 4.5 km apart.…”

Section: Methodsmentioning

confidence: 99%

“…This protected area is surrounded by the Araguaia, Coco, and Java es rivers, which promote the formation of many islands, lakes, and flooded forests. Just before the wet season and prior to flooding, we selected two areas, a seasonally flooded forest (regionally called 'impuca') (Barbosa et al 2011, Maracahipes et al 2014) and a non-flooded forest, near the visitor center along the margin of the Coco River, ca 4.5 km apart. In these areas, the soil varied from alluvial to lateritic, and was covered by a thick layer of leaf litter.…”

Section: Methodsmentioning

confidence: 99%

Juxtaposition and Disturbance: Disentangling the Determinants of Lizard Community Structure

et al. 2015

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Disturbance alters the structure and dynamics of communities. Here, we examined the effects of seasonal flooding on the lizard community structure by comparing two adjacent habitats, a seasonally flooded and a non-flooded forest, in a Cerrado-Amazon ecotone area, the Cantão State Park, Tocantins state, Brazil. Despite the strong potential impact of seasonal flooding, the only significant environmental difference detected was more termite mounds in non-flooded forests. Species richness was significantly higher in the non-flooded forest. Colobosaura modesta, followed by Mabuya frenata and Anolis brasiliensis, were the only species that differed in number of captures between sites. Colobosaura modesta was exclusively found in the non-flooded forest, while Anolis brasiliensis was the most captured in the flooded forest. Mabuya frenata is indicated as an indicator species in the flooded forest, and Colobosaura modesta in the non-flooded forest. We found a significant association between lizard abundances and habitat characteristics, with flooding, canopy cover, and logs being the best predictors. A phylogenetic community structure analysis indicated a lack of structure in both lizard assemblages. Overall, we show that seasonal flooding can strongly impact species richness and species occurrence patterns, but not phylogenetic community structure. The Amazon-Cerrado transition is undergoing pronounced transformations due to deforestation and climate change. Despite being species-poor compared with central areas in Amazon or Cerrado, this ecotone harbors species with important adaptations that could hold the key to persistence in human-disturbed landscapes or during periods of climate change.Abstract in Portuguese is available with online material.

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Estrutura da vegetação lenhosa em dois fragmentos naturais de florestas inundáveis (impucas) no Parque Estadual do Araguaia, Mato Grosso

Cited by 16 publications

References 39 publications

Recurrent wildfires drive rapid taxonomic homogenization of seasonally flooded Neotropical forests

Recurrent wildfires drive rapid taxonomic homogenization of seasonally flooded Neotropical forests

Spatial Variability of the Physicochemical Properties of Soils from Seasonally Flooded Forest Fragments on a Tropical Plain

Juxtaposition and Disturbance: Disentangling the Determinants of Lizard Community Structure

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