Influência Do Regime De Queimadas Sobre a Riqueza E Composição Florística De Uma Savana Isolada Na Amazônia - Peld Oeste Do Pará

Lima, Juliana Maia; Castro, Arlison Bezerra; Lima, Albertina P.; Magnusson, William E.; Landeiro, Victor Lemes; Fadini, Rodrigo Ferreira

doi:10.4257/oeco.2020.2402.06

Cited by 9 publications

(15 citation statements)

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“…Several vegetation properties, such as structure, species richness and composition were correlated with fire regime during the last few decades (Lima et al 2020). Species composition of unburned plots or plots with very low fire frequency was different from with plots that burn frequently.…”

Section: Resultsmentioning

confidence: 99%

“…canopy cover) at forest-savanna boundaries. Finally, fire is probably of cornerstone importance for maintaining the forest-savanna borders in the Alter do Chão region (Lima et al 2020), as it is globally (Hoffmann et al 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Species composition of unburned plots or plots with very low fire frequency was different from with plots that burn frequently. Open savannas were encroached by woody savannas or invaded by forests in the few sites unburned for more than 20 years (Lima et al 2020). Therefore, by affecting vegetation dynamics and diversity, fire could have an indirect effect on vertebrates by changing vegetation structure and cover.…”

Section: Resultsmentioning

confidence: 99%

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Long-term standardized ecological research in an Amazonian savanna: a laboratory under threat

Fadini

Brocardo

Rosa

et al. 2021

An. Acad. Bras. Ciênc.

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A few decades ago, researchers from the National Institute for Amazonian Research (INPA) started a pilot study to integrate the ecological studies of several organisms using monitoring plots, which then became the embryo for the creation of the RAPELD (Rapid Assessments and Long-term Ecological Research) system used by the Program for Biodiversity Research (PPBio) and the Long-term ecological research site POPA (PELD Western Pará). They installed and maintained permanent plots in an Amazonian-savanna patch near to the village of Alter do Chão. Amazonian savannas constitute a threatened ecosystem comprising only 6% of the Amazon biome. Most of the studies focused on three main long-term ecological research questions, but the site was also of importance for other inquiries and for the training of young researchers, contributing 71 articles so far and 32 masters and doctorate theses. Here, we present the experimental design and results of standardized studies in the savannas and forest fragments near Alter do Chão that have been carried out over the years. We discuss the future prospects and local threats to the area (e.g. soy crops and land speculation), and highlight the need to incorporate Alter do Chão villagers in land-use planning in the region.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Long-term standardized ecological research in an Amazonian savanna: a laboratory under threat

Fadini

Brocardo

Rosa

et al. 2021

An. Acad. Bras. Ciênc.

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“…Nas áreas de savanas estudadas (5 ha) destacou-se Fabaceae, Myrtaceae e Malpighiaceae com maior número de espécies e Byrsonima crassifolia (1.413), Curatella americana (660) e Myrcia cuprea (544) com maior número de indivíduos. Resultados semelhantes em quantidade de indivíduos, de famílias e de espécies foram encontrados por Ferreira et al (2015a) no estrato lenhoso em savanas de Roraima; Ferreira et al (2015b) (Lima et al, 2020).…”

Section: Discussionunclassified

“…Estas áreas, por estarem isoladas da distribuição contínua do cerrado, podem apresentar limitações na colonização de espécies, devido à sua grande distância da fonte de propágulos e do mecanismo de dispersão das espécies (Ferreira et al, 2020). No Brasil, a savana é considerada um hotspot de biodiversidade, pelo fato de constituir alta diversidade de espécies, alto grau de endemismo e elevado grau de ameaça em consequência do uso da terra para monocultura e pastagens (Lima et al, 2020).…”

Section: Introductionunclassified

Florística e estrutura do estrato arbóreo em cinco savanas no estado do Pará, Brasil

Coutinho

Neto

Jardim

2021

Rev. Bras. Geog. Fis.

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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 do caule ao nível do solo (DCNS3cm) ≥ 3 cm e adotando-se a distribuição em classes de altura estratificadas em CI (≤ 4,19 m), CII (4,2-7,56 m) e CIII (≥ 7,57 m) e; em classes de diâmetro em CI (3-7 cm), CII (7,1-12 cm), CIII (12,1-17 cm), CIV (17,1-22 cm) e CV (≥ 22,1 cm). Em cinco ha de savanas foram registrados 3.984 indivíduos, distribuídos em 33 famílias, 54 gêneros e 69 espécies. Fabaceae (8), Myrtaceae (6) e Malpighiaceae (5) destacaram-se com maior riqueza e Malpighiaceae em abundância. Byrsonima crassifolia (1.413), Curatella americana (660) e Myrcia cuprea (544) obtiverm maior número de indivíduos e valor de importância em todas as áreas, acompanhadas por Himatanthus articulatus e Hancornia speciosa. A classe CI de altura e de diâmetro agrupou o maior número de indivíduos e a maior diversidade e grau de similaridade florística entre as classes CI e CII. A hiperdominância de indivíduos das espécies de maior participação na estrutura vertical, típicas das savanas amazônicas, indica uma adequação a ambientes com condições distróficas, em solos arenosos ácidos e com baixo conteúdo de nutrientes e; assegura afirmar que estas áreas de savanas são jovens, ainda em fase de desenvolvimento. Floristic and structure of the woody species in five savannas in the state of Pará, BrazilA B S T R A C T Amazonian savannas form environmentally degraded and underestimated ecosystems, especially with regard to the dynamics of vegetation and the ecological processes that occur. With the objective of determining the floristic composition and the structure of plant communities in fragments of disjointed Cerrado, this work was developed in five coastal oreadic areas, located in the Northeast of Pará and Ilha do Marajó, PA. Data collections were performed following the Minimum Phytosociological Assessment protocol in landscapes with a higher level of conservation, including live woody specimens, with stem diameter at ground level (DCNS3cm) ≥ 3 cm and adopting stratified height classes: CI (≤ 4.19 m), CII (4.2-7.56 m) and CIII (≥ 7.57 m) and diameter classes in CI (3-7 cm), CII (7.1-12 cm), CIII (12.1-17 cm), CIV (17.1-22 cm) and CV (≥ 22.1 cm). In five ha of savannas 3,984 individuals were registered, distributed in 33 families, 54 genera and 69 species. Fabaceae (8), Myrtaceae (6) and Malpighiaceae (5) stood out with greater wealth and Malpighiaceae in abundance. Byrsonima crassifolia (1413), Curatella americana (660) and Myrcia cuprea (544) stood out in number of individuals and importance value in all areas, accompanied by Himatanthus articulatus and Hancornia speciosa. The data showed that the CI class of height and diameter grouped the largest number of individuals and the largest number of individuals, diversity and degree of floristic similarity between classes CI and CII. The hyper-dominance of individuals of the species with greater participation in the vertical structure, typical of the Amazonian savannas, indicates an adaptation to environments with dystrophic conditions, in acidic sandy soils and with low nutrient content and; ensures that these savanna areas are young, still under development.Keywords: Phytosociology; structural classes; typical species.

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Effects of fire regime on the bird community in an Amazonian savanna

et al. 2023

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Savannas are ecosystems maintained by fires, characterized by a fire-adapted biota, and savanna patches occur in Amazonia in patches surrounded by tropical forest. Different fire regimes can generate structurally diverse vegetation, and savanna birds are known to be closely related to vegetation structure. However, long-term approaches and interaction of fire with other environmental factors need to be explored for the better understanding of the effects of habitat fire on birds. In an Amazonian landscape composed by savanna and forest, we investigate the effects of different fire regimes in a 12-ha area in three periods through 23 years. We also examined the effects of frequency and extent of fires, tree cover, and distance to forest on bird composition in twelve 3.7ha savannas plots. Birds were surveyed with mist-nets and species were classified as to their habitat use by comparison of registers in forest and savanna plots through visual/acoustical surveys. After 13 years of fire suppression, many forest species colonized the area and some savanna species were lost. Fire frequency and tree coverage affect avifauna communities. The avifauna was sensitive to the occurrence of fires, independent of fire extent. After one fire event in a plot that had been protected from fire for 12 years, some savanna species returned. These results highlight the effects of the fire regime on birds species composition and indicate that many savanna bird species depend on the occurrence of regular fires.

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Influência Do Regime De Queimadas Sobre a Riqueza E Composição Florística De Uma Savana Isolada Na Amazônia - Peld Oeste Do Pará

Cited by 9 publications

References 0 publications

Long-term standardized ecological research in an Amazonian savanna: a laboratory under threat

Long-term standardized ecological research in an Amazonian savanna: a laboratory under threat

Florística e estrutura do estrato arbóreo em cinco savanas no estado do Pará, Brasil

Effects of fire regime on the bird community in an Amazonian savanna

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