Rudney A. Santos

Rudney A. Santos
Université de Montpellier | UM1 · Institut des Sciences de l’Évolution Montpellier (ISEM)

Dr.

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19
Publications
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178
Citations
Citations since 2016
10 Research Items
175 Citations
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070
2016201720182019202020212022010203040506070

Publications

Publications (19)
Article
The Quaternary palynology commonly requires the use of acids such as hydrofluoric acid (HF), sulfuric acid (H 2 SO 4), and hydrochloric acid (HCl) to extract pollen grains and sediment spores. In some countries, restricted access to these acids makes fossil pollen studies challenging. Here, we propose an alternative pollen processing technique that...
Article
Full-text available
The South American Monsoon System is responsible for the majority of precipitation in the continent, especially over the Amazon and the tropical savannah, known as ‘Cerrado’. Compared to the extensively studied subtropical and temperate regions the effect of the Medieval Climate Anomaly (MCA) on the precipitation over the tropics is still poorly un...
Article
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The origin of modern disjunct plant distributions in the Brazilian Highlands with strong floristic affinities to distant montane rainforests of isolated mountaintops in the northeast and northern Amazonia and the Guyana Shield remains unknown. We tested the hypothesis that these unexplained biogeographical patterns reflect former ecosystem rearrang...
Article
The origin of modern disjunct plant distributions in the Brazilian Highlands with strong floristic affinities to distant montane rainforests of isolated mountaintops in the northeast and northern Amazonia and the Guyana Shield remains unknown. We tested the hypothesis that these unexplained biogeographical patterns reflect former ecosystem rearrang...
Article
Available online xxxx Editor: L. Robinson Keywords: paleoclimate paleo-vegetation speleothems isotopes cave sediments δ 18 O values in speleothems have been utilized to document past changes in South American monsoon intensity. However, changes in regional vegetation and ecosystems have not been part of this discussion, and other cave proxies such...
Article
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Late Holocene hydroclimate variations have been extensively recognized in Amazonia, but the effects of such changes on riverine discharge within the Amazon lowlands are still poorly understood. We investigated a sediment core covering circa 4,000 to 300 cal yr BP collected in the lower valley of the Xingu River (Xingu Ria) in an area under the infl...
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We present two pollen diagrams from the semi-arid Caatinga of the Catimbau National Park, in Pernambuco and from a Mauritia palm forest in the Caatinga/Cerrado ecotone of southern Piauí, NE Brazil, spanning the last 10,000 cal. yrs BP and the last 1,750 cal yrs BP, respectively. These two records contain a signature of the local vegetation and perm...
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The Xingu and Tapajós rivers in the eastern Amazon are the largest clearwater systems of the Amazon basin. Both rivers have “fluvial rias” (i.e., lake-like channels) in their downstream reaches as they are naturally impounded by the Amazon mainstem. Fluvial rias are widespread in the Amazon landscape and most of the sedimentary load from the major...
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The Colônia Deep Drilling Project held its first International Continental Scientific Drilling Program (ICDP) workshop in September 2014 at the University of São Paulo (Brazil). Twenty-seven experts from six countries discussed the feasibility and the expectations of a deep drilling in the structure of Colônia located at the southwestern margin of...
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The Xingu River is a large clearwater river in eastern Amazonia and its downstream sector, known as the Volta Grande do Xingu ("Xingu Great Bend"), is a unique fluvial landscape that plays an important role in the biodiversity, biogeochemistry and prehistoric and historic peopling of Amazonia. The sedimentary dynamics of the Xingu River in the Volt...
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THE PALEOENVIRONMENTAL SIGNIFICANCE OF FUNGAL PALYNOMORPHS IN A QUATERNARY PEAT FROM THE MIDDLE PARAÍBA DO SUL RIVER VALLEY, SP, BRAZIL. This study deals with spores, conidia and hyphae of fungi present in a peatbog core from the Eugenio de Melo district, middle Paraíba do Sul River Valley in the State of São Paulo, Brazil. Dated between 11,240 to...
Article
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ABSTRACT. Ucides cordatus (Linnaeus, 1763) is a hypo-hyper-regulating mangrove crab possessing gills for respiratory and osmoregulatory processes, separated in anterior and posterior sections. They also have hepatopancreas, which is responsible for digestion and absorption of nutrients and detoxification of toxic metals. Each of these organs has sp...
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RESUMO: Por possuir uma grande heterogeneidade ambiental, os registros paleoclimáticos do Estado de São Paulo, no Sudeste do Brasil, fornecem informações significativas sobre a dinâmica vegetacional e climáticas dos mais variados ecossistemas brasileiros desde a fase final do Pleistoceno ate os dias atuais como florestas tropicais pertencentes ao d...
Article
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Recebido em 31.V. 2011. Aceito em 02. V. 2012 RESUMO – Este estudo apresenta palinomorfos identificados em turfas da região de Eugênio de Melo, no Médio Vale do Rio Paraíba do Sul, no estado de São Paulo. As amostras foram extraídas em intervalos de 10 cm, de um testemunho com 3,90 m de profundidade, com idades entre 11400-11220 e 490-290 Cal. anos...
Article
Full-text available
Peat palynomorphs from Eugenio de Melo, middle valley of Paraiba do Sul River, Sao Paulo, Brazil. This paper presents palynomorphs identified in the peats of the Eugenio de Melo region, the middle valley of the Paraiba do Sul River, Sao Paulo State. The samples were collected at intervals of 10 cm from a core with 3.90 m deep, aged between 11400-11...
Article
This paper is about palynological studies realized at Paraíba do Sul river floodplain, in São Paulo. The hole made by vibro-core reached 390 cm depth. The core showed two very similar sedimentation cycles represented by sand in the basis, followed by clay and peat on the top. Besides, the second sequence presents one clay layer on the peat. The fir...

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Projects (2)
Project
The basin of Colônia, São Paulo Brazil, consists of bog type and lacustrine sediments deposited in a regionally unique, near-circular structure of 3.6 km diameter. Results of the geophysical survey showed that the basal layer was reached at ~500 m depth. Our aim is to retrieve a deep drilling and reconstruct a continuous frame of the Quaternary climate and vegetation of the Southern Hemisphere.