Changes in the Cerrado vegetation structure: insights from more than three decades of ecological succession

Gonçalves, Rogério Victor; Cardoso, João Custódio Fernandes; Oliveira, Paulo Eugênio; Oliveira, Dênis Coelho de

doi:10.5194/we-21-55-2021

Cited by 33 publications

(14 citation statements)

References 49 publications

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“…072/97 of 4 June 1997) that was created in 1986 by the Federal University of Uberlândia to carry out research in preserved Cerrado environments. It contains several types of vegetation typical of the Cerrado, a large Neotropical savanna ecosystem, including savanna, forest, and open grassland areas (Gonçalves et al, 2021). Climate in the region shows two well defined seasons: one cooler and drier, between May and September; and a warmer and wetter period, from October to April (Rosa et al, 1991).…”

Section: Methodsmentioning

confidence: 99%

“…(2) whether plants with nocturnal flower opening, by often also attracting diurnal pollinators, were in average more important for the multilayer network structure than diurnal plants. We expect that the multilayer network approach would reveal an overlap in plant spe- and open grassland areas (Gonçalves et al, 2021). Climate in the region shows two well defined seasons: one cooler and drier, between May and September; and a warmer and wetter period, from October to April (Rosa et al, 1991).…”

Section: Plantsmentioning

confidence: 99%

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Integrating nocturnal and diurnal interactions in a Neotropical pollination network

et al. 2022

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Plants establish pollination interactions with different groups of animals, including nocturnal ones that establish interactions with economically valuable and culturally important crops, as well as wild plants of conservation concern. Despite the considerable number of studies addressing the structure and dynamic of pollination networks, nocturnal interactions have been relatively overlooked. Using a multilayer network approach and considering diurnal and nocturnal interactions, we aimed to understand how interactions at different periods of the day are integrated and contribute to the network structural pattern. We also aimed to highlight how multilayer networks may give a more nuanced assessment of species importance across layers. We assembled a pollination network of an intensively studied Neotropical area by standardizing interaction data from 16 previous studies into a presence/absence (binary) network. Then, we used a multilayer network approach to evaluate the network modularity and plant species' roles in these different temporal layers. Plants were classified as nocturnal or diurnal according to the onset of floral opening and pollinators were classified according to their foraging period. The network consisted of 178 pollinator species and 158 plant species, with 870 links. Among plant species, 135 species have diurnal floral opening while 23 species are nocturnal. The multilayer network was significantly modular, and these modules differed in the composition of pollinator groups (e.g., hawk moths, bats, bees, hummingbirds), as well as of diurnal and nocturnal plants. We show that diurnal and nocturnal interactions are organized into interconnected modules in the multilayer network. Nocturnal plants had higher values of versatility and multidegree than diurnal plants, due to their role in connecting the two temporal layers. Synthesis. Our study highlights the importance of integrating different pollination systems to understand the importance of distinct components that structure pollination networks. We also illustrate the value of tapping into existing information, particularly species interaction data, from well‐studied biodiversity hotspot areas, to gain a better understanding of how communities are structured. Finally, despite the relative scarcity of nocturnal pollination network studies, we showed nocturnal plants, which often make complementary use of diurnal pollinators, to be important in connecting the temporal layers.

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Section: Methodsmentioning

confidence: 99%

Section: Plantsmentioning

confidence: 99%

Integrating nocturnal and diurnal interactions in a Neotropical pollination network

et al. 2022

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“…For example, as shown in Table 3, the higher producer accuracy for the tree and grassland vegetation class was likely a result of Landsat-8 higher spectral sensitivity in characterizing different types of vegetation cover. That is, the good performance in the classi cation obtained for OLI in the arboreal vegetation class can be attributed to its physicochemical structure of perennial shrub characterized by high leaf density when compared to other vegetations (Gonçalves et al 2021). The high concentration of chlorophyll pigment produced through photosynthesis and the high density of foliage distinguish it from other plant species and land use classes, especially in the near and mid-infrared region of the electromagnetic spectrum (Glass, 2019).…”

Section: Input Spectral Con Guration Analysismentioning

confidence: 99%

Assessment of the land use classification surrounding a dam in the semi arid of Pernamuco/Brazil from OLI, MUX images and WorldCover data

Júnior

Pacheco

2022

Preprint

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Detecting changes in land cover helps policymakers to understand the dynamics of environmental changes to ensure sustainable development in the Caatinga Biome. Thus, the identification of spatial features by Remote Sensing emerged as an important research aspect and, therefore, an adequate and accurate methodology for land cover mapping was necessary. In this study, Landsat-8 and CBERS-4 satellite data captured by the Operational Land Instrument (OLI) and the Regular Multispectral Camera (MUX) were used for classification and accuracy analysis for six land cover classes around the dam ‘Barra do Juá’, located in the semi-arid region of Pernambuco state. Recent high resolution images from the European program WorldCover were used as spatial and thematic reference images. The approach developed provided land cover maps for each dataset. After the comparative analysis with the reference product, an accuracy of the producer and average user of 62.44% and 71.74% for MUX and 60.88% and 62.38% for OLI were obtained, respectively. Spatial and spectral characteristics of the images were the main causes of the variability found in the thematic accuracy coefficients. The results obtained showed that the CBERS-4 MUX presented more satisfactory land cover maps than the Landsat-8 OLI data. However, for the classes of natural vegetation, OLI presented better results than MUX.

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“…Alien grasses can form dense clumps that exclude many other herbaceous species in the Cerrado grasslands (Pivello et al, 1999), causing changes in different aspects of the ecosystem such as reduced water drainage (Rossiter et al, 2004). In addition, anthropogenic factors such as alterations in the fire dynamics and habitat fragmentation have led to tree and shrub encroachment in open vegetation ecosystems (Stevens et al, 2017;Gonçalves et al, 2021). Native trees have a great role in the encroachment process, in which domination by a single species reduces richness, leading to biotic homogenization (Barbosa da Silva et al, 2016;Utaile et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Decrease in species richness and diversity, and shrub encroachment in Cerrado grasslands: A 20 years study

Souza

Ferreira

Munhoz

2022

Applied Vegetation Science

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Question:The Cerrado is a global biodiversity hotspot, highly threatened by changes in land use. Alterations in species composition and the colonization of Cerrado grasslands by woody species can lead to long-term changes in these communities. In this study, we investigated changes over 20 years in three grassland areas, in terms of species richness and diversity and growth-form cover, as well as the effects of shrub and grass encroachment on species richness.Location: Cerrado Brazilian savanna, moist grassland and dry shrub grassland. Areas under low and high anthropogenic pressure.Methods: Plant species composition and cover were sampled on seven occasions between the years 2000 and 2020, in permanent line-transects. We compared plant cover, richness, diversity and growth-form cover between the periods for each area.Next, we developed mixed-effect linear models to test whether species richness in grasslands at the latest sampling event was altered by species representing 70% of the species cover at this time.Results: Grasslands located in areas under higher anthropogenic pressure presented reduced richness and diversity, and cover concentrated on a few species of shrubs and large tussock grasses. Moist grassland undergoing encroachment by the native shrub Trembleya parviflora had lost over 50% of its diversity since encroachment. In the same area, a shrub grassland undergoing encroachment by native shrub Raulinoreitzia tremula, three native grass species and one exotic grass presented significantly reduced species richness. The moist grassland in an area under low anthropogenic pressure showed a reordering of the species cover over time, but a decrease in species richness. Conclusion:We observed changes in plant richness, diversity, cover, composition and growth-form cover over a period of 20 years in grassland communities. We found, however, different trajectories in the three grassland areas sampled, mainly due to the encroachment of a few species, leading to floristic homogenization in grasslands located in areas under high anthropogenic pressure.

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Changes in the Cerrado vegetation structure: insights from more than three decades of ecological succession

Cited by 33 publications

References 49 publications

Integrating nocturnal and diurnal interactions in a Neotropical pollination network

Integrating nocturnal and diurnal interactions in a Neotropical pollination network

Assessment of the land use classification surrounding a dam in the semi arid of Pernamuco/Brazil from OLI, MUX images and WorldCover data

Decrease in species richness and diversity, and shrub encroachment in Cerrado grasslands: A 20 years study

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