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Journal articles on the topic 'Amazonian savanna'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Costa-Campos, Carlos Eduardo, and Eliza Maria Xavier Freire. "Richness and composition of anuran assemblages from an Amazonian savanna." ZooKeys 843 (May 9, 2019): 149–69. http://dx.doi.org/10.3897/zookeys.843.33365.

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The Amazonian savannas occupy approximately 150,000 km2 of the Brazilian Amazon, occurring in scattered isolated patches over large areas of forest in the states of Amapá, Amazonas, Pará, Roraima and Rondônia. Despite having considerable variation in the Anuran composition between locations and between the savanna’s physiognomies, a systematic and geographically wide sampling has not been performed for the savanna from Amapá yet, located in the north of Brazil, eastern Amazonia. In this perspective, a study was conducted on the richness, composition, diversity, and abundance of Anuran species

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Costa-Campos, Carlos Eduardo, and Freire Eliza Maria Xavier. "Richness and composition of anuran assemblages from an Amazonian savanna." ZooKeys 843 (May 9, 2019): 149–69. https://doi.org/10.3897/zookeys.843.33365.

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The Amazonian savannas occupy approximately 150,000 km<sup>2</sup> of the Brazilian Amazon, occurring in scattered isolated patches over large areas of forest in the states of Amapá, Amazonas, Pará, Roraima and Rondônia. Despite having considerable variation in the Anuran composition between locations and between the savanna's physiognomies, a systematic and geographically wide sampling has not been performed for the savanna from Amapá yet, located in the north of Brazil, eastern Amazonia. In this perspective, a study was conducted on the richness, composition, diversity, and abundance of Anur

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Devecchi, Marcelo F., Juliana Lovo, Marcelo F. Moro, et al. "Beyond forests in the Amazon: biogeography and floristic relationships of the Amazonian savannas." Botanical Journal of the Linnean Society 193, no. 4 (2020): 478–503. http://dx.doi.org/10.1093/botlinnean/boaa025.

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Abstract Open habitats such as grasslands occupy &lt; 5% of the Amazon and are currently grouped under the broad term Amazonian savanna, covering an area of c. 267 000 km2, mostly in Brazil and Bolivia. These habitats are found isolated within an extensive rainforest matrix, having a distinct flora from the latter. The lower Amazon River is home to several patches of savanna that occupy both south and north banks of the river, in Santarém, Alenquer and Monte Alegre. Although having an abundance of herbaceous plants, most studies on these open areas focus only on tree species, ignoring the

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Campos, Ana Caroline De Souza, and Mário Augusto Gonçalves Jardim. "Composição florística da regeneração de um trecho de savana na Amazônia Oriental." Revista Brasileira de Geografia Física 13, no. 6 (2020): 2777. http://dx.doi.org/10.26848/rbgf.v13.6.p2777-2787.

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O objetivo da pesquisa foi conhecer a composição florística da regeneração natural de um trecho de savana amazônica no estado do Pará. O estudo foi realizado em uma savana na localidade de Itapuá, município de Vigia de Nazaré, Pará a 93 km da cidade de Belém. A coleta de dados ocorreu mensalmente no período de setembro de 2019 a fevereiro de 2020 em 80 subparcelas de 1 x 1m alocadas aleatoriamente correspondente a 480 subparcelas em um total de 480 m2. Em cada subparcela foram identificadas e quantificadas todas as espécies com altura ≤ 1 m. A identificação botânica in loco foi realizada por u

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CASTRO, DARCILÉA F., PAULO E. DE OLIVEIRA, DILCE F. ROSSETTI, and LUIZ C. R. PESSENDA. "Late Quaternary landscape evolution of northeastern Amazonia from pollen and diatom records." Anais da Academia Brasileira de Ciências 85, no. 1 (2013): 35–55. http://dx.doi.org/10.1590/s0001-37652013000100004.

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The main goal of this study was to reconstruct the Late Pleistocene-Holocene floristic composition in an area of the northern Brazilian Amazonia, comparing the results with other Amazonian localities in order to discuss the factors that have influenced phytophysiognomic changes over this time period. The work in eastern Marajó Island at the mouth of the Amazonas River was approached based on analysis of 98 pollen and diatom samples from core data distributed along a proximal to distal transect of a paleoestuarine system. The results indicated high concentration of Rhizophora, associated with a

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Faria, Alessandra Saraiva, Albertina Pimentel Lima, and William Ernest Magnusson. "The effects of fire on behaviour and relative abundance of three lizard species in an Amazonian savanna." Journal of Tropical Ecology 20, no. 5 (2004): 591–94. http://dx.doi.org/10.1017/s0266467404001798.

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Most savanna areas are affected by fire (San José & Fariñas 1983, Scholes & Archer 1997), and presumably all of the fauna that normally occurs in them have characteristics that allow them to maintain populations despite regular fires. Fires are frequent in Amazonian savannas and the vegetation is fire adapted. The Amazonian savanna at Alter do Chão suffers regular fires that affect vegetation structure (Sanaiotti & Magnusson 1995). Fires pass quickly in this area, the vegetation recovers most of the pre-fire cover within 6 mo, and there appears to be no long-term effect on soil str

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Santana, Mariana Martins Medeiros de, Rodrigo Nogueira de Vasconcelos, Salustiano Vilar da Costa Neto, Eduardo Mariano Neto, and Washington de Jesus Sant’Anna da Franca Rocha. "Modeling Plant Diversity Responses to Fire Recurrence in Disjunct Amazonian Savannas." Land 14, no. 7 (2025): 1455. https://doi.org/10.3390/land14071455.

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Fire is a key ecological driver in tropical savannas, yet its effects on plant biodiversity remain understudied in Amazonian savannas. This study investigates how fire recurrence influences taxonomic and functional diversity in savanna ecosystems in northeastern Amazonia. We conducted vegetation surveys across five phytophysiognomies in Amapá State, Brazil, and compiled trait data for 226 plant species. Generalized Additive Mixed Models (GAMMs) were used to evaluate the relationships between fire frequency and diversity metrics across five landscape scales. The results showed that taxonomic di

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Mustin, Karen, William D. Carvalho, Renato R. Hilário, et al. "Biodiversity, threats and conservation challenges in the Cerrado of Amapá, an Amazonian savanna." Nature Conservation 22 (October 3, 2017): 107–27. https://doi.org/10.3897/natureconservation.22.13823.

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An Amazonian savanna in northern Brazil known as the Cerrado of Amapá is under imminent threat from poor land-use planning, the expansion of large-scale agriculture and other anthropogenic pressures. These savannas house a rich and unique flora and fauna, including endemic plants and animals. However, the area remains under-sampled for most taxa, and better sampling may uncover new species. We estimate that only ~9.16% of these habitats have any kind of protection, and legislative changes threaten to further weaken or remove this protection. Here we present the status of knowledge concerning t

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Vasconcelos, Marcelo Ferreira de, Sidnei De Melo Dantas, and José Maria Cardoso da Silva. "Avifaunal inventory of the Amazonian savannas and adjacent habitats of the Monte Alegre region (Pará, Brazil), with comments on biogeography and conservation." Boletim do Museu Paraense Emílio Goeldi - Ciências Naturais 6, no. 2 (2021): 119–45. http://dx.doi.org/10.46357/bcnaturais.v6i2.618.

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Knowledge of the avifaunal composition of Amazonian savannas is important in facilitating a greater understanding of the patterns of evolution of the regional biota. Despite this, this vegetation type has been poorly sampled in comparison to adjacent rainforest habitats. The aim of this paper is to provide an avifaunal inventory of the savannas and other adjacent habitats of Monte Alegre, on the left bank of Amazon River, northwestern Pará, Brazil. Our survey is based both on our own fieldwork and on previously-collected specimens deposited in museums. A total of 300 bird species have been rec

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Pandilha, Joandro, José Júlio de Toledo, Luis Cláudio Fernandes Barbosa, William Douglas Carvalho, Jackson Cleiton de Sousa, and José Maria Cardoso da Silva. "Composition, richness and nestedness of gallery forest bird assemblages in an Amazonian savanna landscape: lessons for conservation." PeerJ 9 (December 1, 2021): e12529. http://dx.doi.org/10.7717/peerj.12529.

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Gallery forests are important to the maintenance of a substantial portion of the biodiversity in neotropical savanna regions, but management guidelines specific to this forest type are limited. Here, we use birds as study group to assess if: (1) functional traits can predict the abundance and occupancy of forest species within a savanna landscape, (2) habitat structures influence the taxonomic, functional, and phylogenetic diversity of forest assemblages, and (3) less diverse gallery forest assemblages are a nested subset of more diverse assemblages living near continuous forests. Then, we pro

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Campos, Ana Caroline De Souza, Salustiano Vilar Costa Neto, and Mário Augusto Gonçalves Jardim. "Floristica, estrutura e formas de vida da regeneração de uma savana amazônica, Pará, Brasil." Revista Brasileira de Geografia Física 14, no. 5 (2021): 2550. http://dx.doi.org/10.26848/rbgf.v14.5.p2550-2572.

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O objetivo do trabalho foi caracterizar a fitossociologia e as formas de vida da regeneração natural em uma savana amazônica. O estudo foi realizado em uma savana na localidade de Itapuá no município de Vigia de Nazaré, Pará. A coleta dos dados foi realizada de setembro de 2019 a novembro de 2020 em 677 parcelas de 1m x 1m distribuídas aleatoriamente. Em cada parcela foram identificadas e quantificadas todas as espécies com altura ≤ 1 m. A identificação botânica in loco foi realizada por um parabotânico do Museu Paraense Emilio Goeldi (MPEG). A organização das famílias foi de acordo com APG IV

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Duivenvoorden, Joost F., and Antoine M. Cleef. "Amazonian savanna vegetation on the sandstone plateau near Araracuara, Colombia." Phytocoenologia 24, no. 1-4 (1994): 197–232. http://dx.doi.org/10.1127/phyto/24/1994/197.

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Maksic, Jelena, Marilia Harumi Shimizu, Gilvan Sampaio de Oliveira, Igor Martins Venancio, Manoel Cardoso, and Felipe Alexandre Ferreira. "Simulation of the Holocene climate over South America and impacts on the vegetation." Holocene 29, no. 2 (2018): 287–99. http://dx.doi.org/10.1177/0959683618810406.

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We provide a comprehensive analysis of the Holocene climate and vegetation changes over South America through numerical simulations. Holocene climate for several periods (8 ka, 6 ka, 4 ka, 2 ka, and present) were simulated by an atmospheric general circulation model, forced with orbital parameters, CO2 concentrations, and sea surface temperature (SST), while the analysis of the biome distributions was made with a potential vegetation model (PVM). Compared with the present climate, our four simulated periods of the Holocene were characterized by reduced South Atlantic Convergence Zone intensity

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Pessoa, Marcos José Gomes, Leonardo Maracahipes-Santos, Josias Oliveira dos Santos, et al. "Floristic composition, diversity and edaphic effects in two rocky savanna communities in the Amazon and Cerrado, Brazil." Ciência Florestal 31, no. 3 (2021): 1383–406. http://dx.doi.org/10.5902/1980509841937.

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Despite the uniqueness and reach of the flora from natural savannas in the Brazilian Amazon, and the existence of studies on its origin and diversity, there are no local studies associating floristic patterns with soil properties in savanna enclaves in the Amazon region of the state of Mato Grosso. Floristic composition and diversity were compared between a woody community from a rocky savanna inselberg in a transition region (RTS) between the two largest South American biomes (Cerrado-Amazon), and an enclave of rocky savanna in the Amazon (RAS), and the effects of soil properties were investi

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Fadini, Sarah Rosane M. C., Reinaldo I. Barbosa, Rafael Rode, Viviane Corrêa, and Rodrigo F. Fadini. "Above-ground biomass estimation for a shrubby mistletoe in an Amazonian savanna." Journal of Tropical Ecology 36, no. 1 (2019): 6–12. http://dx.doi.org/10.1017/s0266467419000294.

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AbstractMistletoes are considered keystone species on woodlands and savannas worldwide, providing a food resource for a diversified fauna, as well as a nutrient-enriched litter. Infections can be large (∼1–3 m) and, in some parts of the Amazonian savannas, parasitize up to 70% of hosts locally. Despite these facts, biomass of mistletoes is rarely investigated. Here we constructed allometric models to predict the biomass stock of the shrubby mistletoe Psittacanthus plagiophyllus in an Amazonian savanna. In addition, we determined whether host size could be used as a proxy for mistletoe biomass.

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Magnusson, William E. "Reproductive Cycles of Teiid Lizards in Amazonian Savanna." Journal of Herpetology 21, no. 4 (1987): 307. http://dx.doi.org/10.2307/1563972.

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Magnusson, William E. "Body Temperatures of Field-Active Amazonian Savanna Lizards." Journal of Herpetology 27, no. 1 (1993): 53. http://dx.doi.org/10.2307/1564905.

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Sanaiotti, T�nia M., and Renato Cintra. "Breeding and Migrating Birds in an Amazonian Savanna." Studies on Neotropical Fauna and Environment 36, no. 1 (2001): 23–32. http://dx.doi.org/10.1076/snfe.36.1.23.8878.

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Whitney, Bronwen S., T. Luke Smallman, Edward TA Mitchard, John F. Carson, Francis E. Mayle, and M. Jane Bunting. "Constraining pollen-based estimates of forest cover in the Amazon: A simulation approach." Holocene 29, no. 2 (2018): 262–70. http://dx.doi.org/10.1177/0959683618810394.

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Pollen dispersal and deposition (PDD) modelling has been instrumental in reconstructing historical vegetation in temperate regions, but its application has been limited in the tropics where there is greatest uncertainty in past land cover change. Here, we apply PDD modelling to Amazonian savanna and forested ecosystems. Empirical pollen data from lakes situated in southwestern Amazonia were used to calibrate the PDD model for a two-component landscape of forest and non-forest. The PDD model was then used to simulate pollen assemblages for different combinations of landscape arrangements (the m

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Oliveira, Rodrigo, Hugo Farias, Ricardo Perdiz, Veridiana Scudeller, and Barbosa Reinaldo Imbrozio. "Structure and tree species composition in different habitats of savanna used by indigenous people in the Northern Brazilian Amazon." Biodiversity Data Journal 5 (September 28, 2017): e20044. https://doi.org/10.3897/BDJ.5.e20044.

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Woody plant diversity from the Amazonian savannas has been poorly quantified. In order to improve the knowledge on wood plants of these regional ecosystems, a tree inventory was carried out in four different habitats used by indigenous people living in the savanna areas of the Northern Brazilian Amazon. The habitats were divided into two types (or groups) of vegetation formations: forest (riparian forest, forest island, and <i>buritizal</i> = <i>Mauritia</i> palm formation) and non-forest (typical savanna). The inventory was carried out in two hectares established in the Darora Indigenous Comm

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RECODER, RENATO SOUSA, FRANCISCO DAL VECHIO, SERGIO MARQUES-SOUZA, et al. "Geographic variation and taxonomy of red-tailed Gymnophthalmus (Squamata: Gymnophthalmidae) from Amazonian Savannas." Zootaxa 4497, no. 1 (2018): 61. http://dx.doi.org/10.11646/zootaxa.4497.1.4.

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Gymnophthalmus represents a challenging group for systematics of microteiid lizards. Due to scarcity of exemplars and molecular data, the taxonomy of the genus has been unstable, and six of its eight species are considered part of a poorly-delimited complex of unisexual and bisexual species. Unnamed populations of red-tailed Gymnophthalmus from savanna enclaves in Amazon, similar to G. vanzoi but with differences in color pattern, have been noted in the literature. Here, we used molecular and morphological data to test the taxonomic status of the Central Amazonian red-tailed Gymnophthalmus (G.

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Falleiro, Rodrigo de Moraes, Maristella Aparecida Corrêa, Luciano Carregosa Carregosa dos Santos, and Marcelo Siqueira De Oliveira. "Evaluation of traditional fire management in an Amazonian savanna." Biodiversidade Brasileira - BioBrasil, no. 1 (August 4, 2020): 12. http://dx.doi.org/10.37002/biobrasil.v10i1.1501.

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CRUZ, PAULO VILELA, and NEUSA HAMADA. "A new species of Harpagobaetis Mol, with amended diagnosis of the genus, and new considerations on predatory species of Baetidae (Ephemeroptera) from South America." Zootaxa 4551, no. 2 (2019): 195. http://dx.doi.org/10.11646/zootaxa.4551.2.4.

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A remarkable new predatory species of Baetidae was collected in a relict patch of Amazonian savanna in Brazil. The feeding habit of the nymph of this new species is very rare in mayflies. Baetidae is composed of more than 900 species, but only 12 are considered to be predators; in South America, the only species recognized as a predator is Harpagobaetis gulosus Mol 1986. The objectives of this study are to describe Harpagobaetis brigada sp. nov., based on nymphs and to amend the diagnosis of the genus. The predatory habit of the nymphs of the new species was confirmed by gut-content analysis a

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Rocha, Loriene Gomes da, Ben Hur Marimon Junior, Amauri de Castro Barradas, et al. "Fire-Induced Floristic and Structural Degradation Across a Vegetation Gradient in the Southern Amazon." Forests 16, no. 8 (2025): 1218. https://doi.org/10.3390/f16081218.

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Climate change and landscape fragmentation have made fires the primary drivers of forest degradation in Southern Amazonia. Understanding their impacts is crucial for informing public conservation policies. In this study, we assessed the effects of repeated fires on trees with a diameter ≥10 cm across three distinct vegetation types in this threatened region: Amazonian successional forest (SF), transitional forest (TF), and ombrophilous forest (OF). Two anthropogenic fires affected all three vegetation types in consecutive years. We hypothesized that SF would be the least impacted due to its mo

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Vilela, Lucas, Carlos Eduardo Costa-Campos, Jackson Cleiton De Sousa, and Thiago Ribeiro De Carvalho. "Reproductive and defensive calls of Hydrolaetare schmidti (Anura: Leptodactylidae) from the Amazonian savanna of Amapá in northern Brazil." Zootaxa 5538, no. 5 (2024): 497–500. https://doi.org/10.11646/zootaxa.5538.5.11.

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Vilela, Lucas, Costa-Campos, Carlos Eduardo, Sousa, Jackson Cleiton De, Carvalho, Thiago Ribeiro De (2024): Reproductive and defensive calls of Hydrolaetare schmidti (Anura: Leptodactylidae) from the Amazonian savanna of Amapá in northern Brazil. Zootaxa 5538 (5): 497-500, DOI: 10.11646/zootaxa.5538.5.11, URL: http://dx.doi.org/10.11646/zootaxa.5538.5.11

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RIBEIRO-JÚNIOR, MARCO A., and SILVANA AMARAL. "Catalogue of distribution of lizards (Reptilia: Squamata) from the Brazilian Amazonia. IV. Alopoglossidae, Gymnophthalmidae." Zootaxa 4269, no. 2 (2017): 151. http://dx.doi.org/10.11646/zootaxa.4269.2.1.

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We present distribution data of all Alopoglossidae and Gymnophthalmidae lizards known from the Brazilian Amazonia, totaling 54 species-level taxa, belonging to 17 genera and two families. This represents 22 more species-level taxa than previously reported. Data were based on 17,431 specimens deposited in three North American and eight Brazilian museums, including the main collections harboring Amazonian material. Most species (~80%) are endemic to Amazonia; non-endemic species are mainly associated with open vegetation (savanna) enclaves or open dry (semideciduous) forest in Amazonia, with a f

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Boss, Roberta Lúcia, and José Maria Cardoso da Silva. "Core and transient species in an Amazonian savanna bird assemblage." Revista Brasileira de Ornitologia 22, no. 4 (2014): 374–82. http://dx.doi.org/10.1007/bf03544274.

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Sebastiani, Renata, and Maria Candida Henrique Mamede. "Two new species of Janusia (Malpighiaceae) from Brazil." Hoehnea 41, no. 1 (2014): 121–27. http://dx.doi.org/10.1590/s2236-89062014000100011.

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Two new Brazilian species of Janusia are described and illustrated: Janusia diminuta, restricted to the Restinga vegetation in Northern Rio de Janeiro State; and Janusia paraensis, which is known from the Amazonian savanna vegetation in Pará State. Their diagnostic features are pointed out and a discussion of their relations to other species of Janusia are provided herewith.

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RIBEIRO-JÚNIOR, MARCO A., and SILVANA AMARAL. "Catalogue of distribution of lizards (Reptilia: Squamata) from the Brazilian Amazonia. III. Anguidae, Scincidae, Teiidae." Zootaxa 4205, no. 5 (2016): 401. http://dx.doi.org/10.11646/zootaxa.4205.5.1.

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We present distribution data of all Anguidae, Scincidae, and Teiidae lizards known from the Brazilian Amazonia, totaling 29 species-level taxa, belonging to 14 genera. This represents 11 more species-level taxa than previously reported for these families in this area. Data were based on literature and 46,806 specimens deposited in three North American and eight Brazilian museums, including the main collections harboring Amazonian material. Most species (~55%) are endemic to Amazonia. Except for Ameiva ameiva, that is present in several environments and domains, non-endemic species are either a

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BORGES, SÉRGIO HENRIQUE, CINTIA CORNELIUS, CAMILA RIBAS, et al. "What is the avifauna of Amazonian white-sand vegetation?" Bird Conservation International 26, no. 2 (2015): 192–204. http://dx.doi.org/10.1017/s0959270915000052.

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SummaryWhite-sand vegetation (WSV) is a rare vegetation type in the Amazon basin that grows in nutrient impoverished sandy soils that occur as patches of variable size. Associated with this vegetation is bird assemblage that has not yet been fully characterized. Based on published species inventories and our own field data we compile a checklist of bird species recorded in WSV. In addition, we compared the avifauna of WSV with that found in savanna patches, another type of Amazonian open vegetation. WSV hosted a distinctive avifauna including endemic and threatened species. The number of bird

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Calle-Rendón, Bayron R., José Julio de Toledo, Karen Mustin, Ivan M. Vasconcelos, and Renato R. Hilário. "Priority areas for conservation of primates in a threatened Amazonian savanna." Journal for Nature Conservation 65 (February 2022): 126109. http://dx.doi.org/10.1016/j.jnc.2021.126109.

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Penha, Deliane Vieira, and Patrícia Chaves de Oliveira. "Convergence of physiological responses in woody plants in an Amazonian savanna." Brazilian Journal of Botany 42, no. 3 (2019): 575–79. http://dx.doi.org/10.1007/s40415-019-00546-x.

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Albernaz, Ana L. K., Selvino Neckel-Oliveira, William Magnusson, and Albertina Lima. "Diversity and distribution of frogs in an Amazonian savanna in Brazil." Amphibia-Reptilia 21, no. 3 (2000): 317–26. http://dx.doi.org/10.1163/156853800507516.

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AbstractWe studied the distribution of anurans in savanna, regrowth and mature forest at the mouth of the Tapajós river in Brazilian Amazonia. We sampled 31 sites on the right bank of the Tapajós river and on the shores of lakes nearby, and recorded all acoustic and visual observations of frogs. We found 18 anuran species: Leptodactylidae (8), Hylidae (7), Bufonidae (2) and Pseudidae (1). The distribution of species indicated that some species are generalists and others are restricted to certain habitats. The species at Alter do Chão are a subset of those found in forested sites in Amazonia. L

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Pequeno, Pedro A. C. L., Ciro Campos, and Reinaldo Imbrozio Barbosa. "Ants offset bottom-up control of spiders in Amazonian savanna trees." Acta Oecologica 121 (November 2023): 103955. http://dx.doi.org/10.1016/j.actao.2023.103955.

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Khorsand Rosa, Roxaneh, Reinaldo Imbrozio Barbosa, and Suzanne Koptur. "How do habitat and climate variation affect phenology of the Amazonian palm, Mauritia flexuosa?" Journal of Tropical Ecology 29, no. 3 (2013): 255–59. http://dx.doi.org/10.1017/s0266467413000242.

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Abstract:Although the dioecious palm, Mauritia flexuosa plays a pivotal role in Amazonian ecology and economy, little is known about its flowering and fruiting patterns. We investigated the role of habitat and inter-annual precipitation in the phenology of M. flexuosa. We calculated sex ratios and recorded phenology for 20 mo in four populations (N = 246) of savanna–forest ecotone (two sites) and forest (two sites) habitat in Roraima, Brazilian Amazonia. Sex ratios were significantly female-biased, and >98% of females set fruit. No significant relationship was found between habitat and sex.

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Layme, Viviane Maria Guedes, Albertina Pimentel Lima, and William Ernest Magnusson. "Effects of fire, food availability and vegetation on the distribution of the rodent Bolomys lasiurus in an Amazonian savanna." Journal of Tropical Ecology 20, no. 2 (2004): 183–87. http://dx.doi.org/10.1017/s0266467403001263.

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We investigated the relative influences of vegetation cover, invertebrate biomass as an index of food availability and the short-term effects of fires on the spatial variation in densities of the rodent Bolomys lasiurus in an Amazonian savanna. Densities were evaluated in 31 plots of 4 ha distributed over an area of approximately 10×10 km. The cover of the tall grass (Trachypogon plumosus), short grass (Paspalum carinatum), shrubs and the extent of fire did not explain the variance in densities of Bolomys lasiurus. Food availability alone explained about 53% of the variance in B. lasiurus dens

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SILVA, Libério Junio da, Deborah Pinheiro DICK, Djennifer NECKEL, et al. "Effects of fire on soil organic matter in northern Amazonian forest fragments." Acta Amazonica 52, no. 1 (2022): 13–22. http://dx.doi.org/10.1590/1809-4392202100133.

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ABSTRACT Forest fires incorporate pyrogenic organic matter into the soil, affecting the characteristics of soil organic matter (SOM) due to its high aromaticity, increasing its renewal time. However, the factors that control the concentration of pyrogenic organic matter and its chemical composition and structure are still little known. Forest fragments dispersed in a savanna matrix of the northern Brazilian Amazon are frequently impacted by fires, which can affect the composition of SOM within the fragments. The aim of this study was to analyse the chemical composition of SOM in the border and

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Araújo, Maria Aparecida, Antônio Elielson Rocha, Izildinha Miranda, and Reinaldo Barbosa. "Hydro-edaphic conditions defining richness and species composition in savanna areas of the northern Brazilian Amazonia." Biodiversity Data Journal 5 (July 26, 2017): e13829. https://doi.org/10.3897/BDJ.5.e13829.

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Studies on plant communities in the Amazon have reported that different hydro-edaphic conditions can affect the richness and the species composition of different ecosystems. However, this aspect is poorly known in the different savanna habitats. Understanding how populations and plant communities are distributed in these open vegetation areas is important to improve the knowledge about which environmental variables influence the occurrence and diversity of plants in this type of regional ecosystem. Thus, this study investigated the richness and composition of plant species in two savanna areas

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Ratter, J. A., S. Bridgewater, R. Atkinson, and J. F. Ribeiro. "Analysis of the floristic composition of the Brazilian cerrado vegetation II: Comparison of the woody vegetation of 98 areas." Edinburgh Journal of Botany 53, no. 2 (1996): 153–80. http://dx.doi.org/10.1017/s0960428600002821.

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An analysis was made of the floristic composition of 98 areas of cerrado and Amazonian savanna, encompassing most of the area of such vegetation in Brazil. A total of 534 species of trees and large shrubs were recorded for these areas, of which 158 (30%) occurred at a single site only. Such unicates and taxa without determinations to specific level were excluded from the study since they provide no basis for comparison. The data were analysed by three techniques of multivariate analysis: (a) a divisive hierarchical classification by Two-way Indicator Species Analysis (TWINSPAN). (b) an agglome

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Ferreira Melo, Valdinar, Ariane Evald, Paulo Roberto Ribeiro Rocha, et al. "Long-Term impact of rice cultivation on soil quality indicators in Northern Amazonia Savanna." Scientia Agropecuaria 16, no. 2 (2025): 143–54. https://doi.org/10.17268/sci.agropecu.2025.012.

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Changes in soil attributes following changes in management strategies in rice cultivation can alter soil quality, either positively or negatively. The aim of this study was to evaluate soil quality indicators, based on physical, chemical and microbiological soil attributes in Amazonian savanna under rice cultivation with different ages. The research was conducted in five areas under continuous rice cultivation during 1, 3, 8, 13, and 25 years, compared with local reference native vegetation. Soil samples were collected at 0-10 cm depth and evaluated for physical attributes such as texture and

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Pereira, Joana C., and Eduardo Viola. "Close to a Tipping Point? The Amazon and the Challenge of Sustainable Development under Growing Climate Pressures." Journal of Latin American Studies 52, no. 3 (2020): 467–94. http://dx.doi.org/10.1017/s0022216x20000577.

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AbstractThis commentary examines the challenge of sustainable development in the Amazon, arguing that global efforts to mitigate climate change and current Amazonian policies are clearly inadequate to prevent global warming and deforestation from tipping the forest into a savanna. It analyses the growing climate pressures jeopardising the Amazon's resilience; the erratic Brazilian, Bolivian, Colombian, Ecuadorian and Peruvian governance of the forest; and the failure of the Amazon Cooperation Treaty Organization (ACTO) to establish long-term forest conservation policies in the region. The rese

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MEIRELLES, JULIA, and LUCAS F. BACCI. "Miconia renatogoldenbergii (Miconieae, Melastomataceae), a new species from savanna enclaves in southern Amazonia, Brazil." Phytotaxa 298, no. 2 (2017): 187. http://dx.doi.org/10.11646/phytotaxa.298.2.9.

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A new species of Miconia section Miconia, subsection Seriatiflorae from the Brazilian Amazonian region is described. Miconia renatogoldenbergii has a wide distribution in areas of savanna and forest understory in the states of Pará, Mato Grosso and Rondônia. It is similar to M. punctata as both species have chartaceous leaves with rusty lepidote indument on the abaxial surface. The new species can be distinguished by its mucronate leaf apex, a thyrse with short scorpioid branches, and subulate anthers, with round apex, dehiscent through an apical pore and with cordate connective appendages.

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Mustin, Karen, William D. Carvalho, Renato R. Hilário, et al. "Biodiversity, threats and conservation challenges in the Cerrado of Amapá, an Amazonian savanna." Nature Conservation 22 (October 3, 2017): 107–27. http://dx.doi.org/10.3897/natureconservation.22.13823.

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Pereira Uchoa, Sandra Catia, Ronaldo Jaques Pain, Jose Maria Arcanjo Alves, Deyse Cristina Oliveira Silva, Valdinar Ferreira Melo, and Samuel Silva. "Doses and potassium partitioning methods in soybean production components in an Amazonian savanna." REVISTA AGRO@MBIENTE ON-LINE 12, no. 4 (2018): 258. http://dx.doi.org/10.18227/1982-8470ragro.v12i4.5332.

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After nitrogen, potassium is the macronutrient most required by soybean. To meet soy bean growth demands, it is necessary to use high K doses, which can lead to losses via leaching. The objective of the current study was to evaluate the effect of doses and methods of K fertilization on the components of soybean production, in the Yellow Latosol of an Amazonian savanna. The experiment was conducted using randomized complete block design with four replicates. Plots consisted of two fertilization methods (M1 – fertilization on planting and at 35 days after emergence

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Mesquita, Daniel Oliveira, Gabriel Corrêa Costa, and Guarino Rinaldi Colli. "ECOLOGY OF AN AMAZONIAN SAVANNA LIZARD ASSEMBLAGE IN MONTE ALEGRE, PARÁ STATE, BRAZIL." South American Journal of Herpetology 1, no. 1 (2006): 61–71. http://dx.doi.org/10.2994/1808-9798(2006)1[61:eoaasl]2.0.co;2.

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Magnusson, William E., Albertina P. Lima, Allessandra S. Faria, Reynaldo L. Victoria, and Luiz A. Martinelli. "SIZE AND CARBON ACQUISITION IN LIZARDS FROM AMAZONIAN SAVANNA: EVIDENCE FROM ISOTOPE ANALYSIS." Ecology 82, no. 6 (2001): 1772–80. http://dx.doi.org/10.1890/0012-9658(2001)082[1772:sacail]2.0.co;2.

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Rossetti, D. F., S. Almeida, D. D. Amaral, C. M. Lima, and L. C. R. Pessenda. "Coexistence of forest and savanna in an Amazonian area from a geological perspective." Journal of Vegetation Science 21, no. 1 (2010): 120–32. http://dx.doi.org/10.1111/j.1654-1103.2009.01129.x.

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Gottsberger, Gerhard, and Wilfried Morawetz. "Development and distribution of the epiphytic flora in an Amazonian savanna in Brazil." Flora 188 (1993): 145–51. http://dx.doi.org/10.1016/s0367-2530(17)32258-2.

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Hirst, Joseph, Joy S. Singarayer, Umberto Lombardo, and Francis Mayle. "Constraining the population size estimates of the pre-Columbian Casarabe Culture of Amazonian Bolivia." PLOS One 20, no. 5 (2025): e0325104. https://doi.org/10.1371/journal.pone.0325104.

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The capacity of Amazonian environments to support large indigenous societies prior to European Contact has long been a contentious area of debate, particularly in regions where pre-Columbian cultures are known to have constructed large, spatially complex earthworks. Here, we provide the first range of supported population estimates for the Casarabe Culture of the Bolivian Llanos de Moxos – one of the most complex pre-Columbian societies yet documented in Amazonia. Between 400 and 1400 CE, the Casarabe Culture inhabited this forest-savanna mosaic landscape, where they constructed hundreds of mo

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Costa coutinho, Joxleide Mendes, Salustiano Vilar Costa Neto, and Mário Augusto Gonçalves Jardim. "Florística e estrutura do estrato arbóreo em cinco savanas no estado do Pará, Brasil." Revista Brasileira de Geografia Física 14, no. 1 (2021): 215. http://dx.doi.org/10.26848/rbgf.v14.1.p215-228.

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As savanas amazônicas formam ecossistemas ambientalmente degradados e subestimados, sobretudo no que se refere à dinâmica da vegetação e aos processos ecológicos ocorrentes. Com o objetivo de determinar a composição florística e a estrutura de comunidades vegetais em fragmentos de Cerrado disjunto, este trabalho foi desenvolvido em cinco áreas oreádicas costeiras, localizadas no Nordeste Paraense e Ilha do Marajó, PA. Os dados foram coletados seguindo o protocolo de Avaliação Fitossociológica Mínima em paisagens com maior nível de conservação, incluindo exemplares lenhosos vivos, com diâmetro

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