Hydro-edaphic conditions defining richness and species composition in savanna areas of the northern Brazilian Amazonia

Araújo, Maria Aparecida de Moura; Rocha, Antônio Elielson Sousa da; Miranda, Izildinha Souza; Barbosa, Reinaldo Imbrózio

doi:10.3897/bdj.5.e13829

Cited by 4 publications

(4 citation statements)

References 31 publications

(29 reference statements)

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“…From an ecological standpoint, Coutinho (2016) considered that the ecology of the cerrado, with deep soils and water table, differs from that of the Amazonian savannas, where the soils are often waterlogged due to the presence of rocks lying at the surface or not far below it. Araújo et al (2017) found that the waterlogged savannas (also known as campinaranas) have considerable higher herbaceous plant diversity and abundance than the more drained sites. Similar sites in the Amazon were already described as swampy savannas (Pires-O'Brien, 1992).…”

Section: Affinities Of the Amazonian Savannasmentioning

confidence: 99%

Beyond forests in the Amazon: biogeography and floristic relationships of the Amazonian savannas

Devecchi

Lovo²,

Moro

et al. 2020

Botanical Journal of the Linnean Society

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Open habitats such as grasslands occupy < 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 relevant non-woody component of the vegetation. Our objectives were to provide new surveys of seed plants for two Amazonian savanna sites and to take the opportunity to revisit the biogeographical links between Amazonian savanna, Amazonian canga vegetation and the central Brazilian cerrado (CBC) and caatinga, analysing woody and herbaceous plants. We created a floristic database that includes sites of Amazonian savannas, including campinarana, coastal scrub (restinga), CBC and Amazonian campos rupestres (on canga or other substrate). We compared those sites using multivariate analyses to find out the degree of floristic resemblance between sites. We prepared a new list of 406 species of seed plants [336 in Parque Estadual de Monte Alegre (PEMA) and 117 in Serra do Itauajuri (SI)], including 23 new records for the state of Pará and some putative new species for science. The Amazonian savannas form three loosely arranged groups, whereas the Amazonian canga formed a cohesive assemblage. Both groups were contrasted against cerrado and caatinga sites and had a distinctive flora from both. Sites from north-western Pará (Alter do Chão, PEMA and SI) were grouped with their northern counterparts in Roraima. An improved representation of the flora of these sites is provided, with more insight into the relationship between the Amazonian savanna sites and other vegetation types. It is worrying that recent changes of the Brazilian legislation place open environments, such as PEMA, in the path of vulnerability to disturbance and destruction.

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Section: Affinities Of the Amazonian Savannasmentioning

confidence: 99%

Beyond forests in the Amazon: biogeography and floristic relationships of the Amazonian savannas

Devecchi

Lovo²,

Moro

et al. 2020

Botanical Journal of the Linnean Society

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“…The savanna region of the state of Roraima is the largest savanna area of the Brazilian Amazon, occurring in the northern state of Roraima ( Barbosa et al 2007 ; Araújo et al 2017 ). The savanna area of Roraima is locally referred as lavrado , “ campos do rio Branco " or " campos de Roraima ", and covers an area of over 40,000 km 2 within the large Rio Branco-Rupununi landscape complex, which extends into the Republic of Guyana and Venezuela ( Barbosa and Fearnside 2005 , Barbosa and Campos 2011 ).…”

Section: Introductionmentioning

confidence: 99%

Structure and tree species composition in different habitats of savanna used by indigenous people in the Northern Brazilian Amazon

Oliveira

Farias

Perdiz

et al. 2017

BDJ

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BackgroundWoody 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 buritizal = Mauritia palm formation) and non-forest (typical savanna). The inventory was carried out in two hectares established in the Darora Indigenous Community region, north of the state of Roraima.New informationThe typical savanna is the most densely populated area (709 stems ha-1); however, it has the lowest tree species richness (nine species, seven families) in relation to typical forest habitats: riparian forest (22 species, 13 families and 202 stems ha-1), forest islands (13 species, 10 families and 264 stems ha-1), and buritizal (19 species, 15 families and 600 stems ha-1). The tree structure (density and dominance) of the forest habitats located in the savanna areas studied in this work is smaller in relation to forest habitats derived from continuous areas of other parts of the Amazon. These environments are derived from Paleoclimatic fragmentation, and are currently affected by the impact of intensive use of natural resources as timberselective logging and some land conversion for agriculture.

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“…The current region is covered by savannas vegetation known locally as "lavrado" (Carneiro-Filho, 1992;Barbosa & Miranda, 2004;Barbosa et al, 2007;Nascimento & Lins, 2018), which consists of grasses and sedges, in open areas, and added with shrub and tree species in areas of more closed vegetation (Miranda & Absy, 2000;Barbosa & Miranda, 2004;Hollowell et al, 2007;Morais & Carvalho, 2015;Araújo et al, 2017). The "lavrado" is also formed by an undefined network of islands of forests dominated by Mauritia flexuosa L.f., being part of the drainage system sometimes associated with paleochannels, called "veredas" (Palm swamps) (Barbosa & Miranda, 2004;Morais & Carvalho, 2015).…”

Section: Vegetation Formationmentioning

confidence: 99%

First record of plant macrofossil from the Boa Vista Formation, Takutu Basin, Roraima State, Brazil

Oliva¹,

Souza²,

Iannuzzi³

et al. 2022

Rev. bras. paleontol.

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Clayey intraclasts containing leaves preserved as impressions and compressions were collected from the Takutu River channel in the State of Roraima, Brazil. In the present study, 23 leaf fragments are described (morphologically and anatomically) and their taxonomic identity is proposed. These fossiliferous intraclasts were suggested in previous studies as coming from the Boa Vista Formation (Upper Pleistocene–Holocene). With the aim of finding new evidence to support this correlation, X-ray diffractometry (XRD) and Laser induced-breakdown spectroscopy (LIBS) analysis were performed, comparing the fossiliferous sample with two outcrops from the Boa Vista Formation. The results evidenced the chemical and mineralogical similarity between the fossiliferous intraclasts and both outcrops, suggesting their correlation with the Boa Vista Formation. Taxonomically, the specimens were recognized as fossil representatives of Dilleniaceae Salisb., Byrsonima Rich. ex Kunth (Malpighiaceae), Zanthoxylum L. (Rutaceae), and other six morphotypes. These taxa represent typical elements of the savanna (lavrados) of Roraima. The anatomical-cutillary characters of the mummified leaves indicate the dominance of xeromorphic plants, similar to the predominant woody species in the “lavrado” today, thus suggesting the same climatic-environmental conditions. Keywords: fossil leaves, leaf architecture, cuticular anatomy, angiosperm, Cenozoic.

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Hydro-edaphic conditions defining richness and species composition in savanna areas of the northern Brazilian Amazonia

Cited by 4 publications

References 31 publications

Beyond forests in the Amazon: biogeography and floristic relationships of the Amazonian savannas

Beyond forests in the Amazon: biogeography and floristic relationships of the Amazonian savannas

Structure and tree species composition in different habitats of savanna used by indigenous people in the Northern Brazilian Amazon

First record of plant macrofossil from the Boa Vista Formation, Takutu Basin, Roraima State, Brazil

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