The quaternary lacustrine deposits of the Serra dos Carajás (state of Pará, Brazil): ages and other preliminary results

Soubiès, François; Suguío, Kenitiro; Martin, Louis; Leprun, Jean-Claude; Servant, Michel; Turcq, Bruno; Foumier, M.; Delaune, Mireille; Sifeddine, Abdelfettah

doi:10.11606/issn.2317-8078.v0i8p223-243

Cited by 24 publications

(31 citation statements)

References 13 publications

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“…, 1998 ). A basin at Serra dos Carajás in the north Brazilian plateau has yielded evidence from both sedimentology and palynology of drier periods during which rain forest was absent ( Soubies et al. , 1991 ).…”

Section: Palaeoclimatologymentioning

confidence: 99%

Neotropical seasonally dry forests and Quaternary vegetation changes

Pennington

Prado

Pendry

2000

Journal of Biogeography

980

788

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Seasonally dry tropical forests have been largely ignored in discussions of vegetation changes during the Quaternary. We distinguish dry forests, which are essentially tree‐dominated ecosystems, from open savannas that have a xeromorphic fire‐tolerant, grass layer and grow on dystrophic, acid soils. Seasonally dry tropical forests grow on fertile soils, usually have a closed canopy, have woody floras dominated by the Leguminosae and Bignoniaceae and a sparse ground flora with few grasses. They occur in disjunct areas throughout the Neotropics. The Chaco forests of central South America experience regular annual frosts, and are considered a subtropical extension of temperate vegetation formations. At least 104 plant species from a wide range of families are each found in two or more of the isolated areas of seasonally dry tropical forest scattered across the Neotropics, and these repeated patterns of distribution suggest a more widespread expanse of this vegetation, presumably in drier and cooler periods of the Pleistocene. We propose a new vegetation model for some areas of the Ice‐Age Amazon: a type of seasonally dry tropical forest, with rain forest and montane taxa largely confined to gallery forest. This model is consistent with the distributions of contemporary seasonally dry tropical forest species in Amazonia and existing palynological data. The hypothesis of vicariance of a wider historical area of seasonally dry tropical forests could be tested using a cladistic biogeographic approach focusing on plant genera that have species showing high levels of endemicity in the different areas of these forests.

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Section: Palaeoclimatologymentioning

confidence: 99%

Neotropical seasonally dry forests and Quaternary vegetation changes

Pennington

Prado

Pendry

2000

Journal of Biogeography

980

788

View full text Add to dashboard Cite

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“…Program Siderite also imprints the sandy aspect of the sediments and develops corroded rhombohedra crystals covered by kaolinite. The two siderite beds have been already recognized by Soubiés et al (1991) in other lakes from Serra Sul and Costa et al (2005) from Serra Norte in Carajás region.…”

Section: Facultad De Ciencias De La Tierra Universidad Autónoma De Nmentioning

confidence: 64%

International Lateinamerika-Kolloquium 2009

Möller-McNett¹

2009

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“…This serra of pre-Cretaceous age is enclosed by the Araguaia and Itacaiúnas rivers. It is located about 540 km south of Belém in southeastern Pará, Brazil, and has an elevational range of 300 to 800 m (Soubies et al 1991;Silva 1993;Cleef & Silva 1994;Piló et al 2015). On the Serra dos Carajás, this species can be locally common on the ferruginous ironstone upland ridges that are covered with iron breccia generically known as canga (Piló et al 2015).…”

Section: Taxonomic Treatmentmentioning

confidence: 99%

Brasilianthus (Melastomataceae), a new monotypic genus endemic to ironstone outcrops in the Brazilian Amazon

2016

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A new monotypic genus, Brasilianthus carajensis, is described from Carajás Mineral Province where it is restricted to campo rupestre vegetation on ironstone outcrops (canga) that form island-like lenses nestled in the Amazon rainforest of southeastern Pará, Brazil. Among neotropical capsular-fruited Melastomataceae, Brasilianthus is distinguished by a unique combination of characters: annual habit; haplostemonous, 4-merous flowers; tubulose-subcylindric hypanthia with erect, narrowly obovate deciduous calyx lobes that are widest distally and well-spaced basally; short cupulate-campanulate anthers with a wide truncate apical pore; biaristate ventral staminal appendages; 4-locular ovary with an apex crowned by four persistent ± deltoid appendages; absence of placental intrusions in mature capsules; and subcochleate seeds with a costate testa. These morphological characters are congruent with DNA sequence data that show Brasilianthus nested within the Marcetia alliance of the tribe Melastomeae where it is sister to Nepsera aquatica. These two genera are in turn sister to Ernestia pullei and Appendicularia thymifolia. A comprehensive description of Brasilianthus is presented together with diagnostic illustrations, images of plants in the wild, a distribution map, SEM images of seeds, a geospatial conservation assessment based on IUCN criteria, and comparisons with generic relatives in the Marcetia alliance.Key words: haplostemony, Marcetia alliance, phylogeny, Serra dos Carajás, canga ResumoUm novo gênero monotípico, Brasilianthus carajensis, é descrito da Província Mineral de Carajás, onde é restrito à vegetação de campo rupestre sobre afloramentos ferruginosos (canga), que formam ilhas rupestres na floresta amazônica no sudeste do estado do Pará, Brasil. Entre as espécies de Melastomataceae neotropicais com frutos capsulares, Brasilianthus distinguese por uma combinação única de caracteres: hábito anual; flores tetrâmeras haplostêmones; hipanto tubuloso e subcilíndrico com lobos do cálice eretos, decíduos, estreitamente obovais, com a parte distal mais larga e base claramente espassada; anteras curtas, cupulado-campanuladas com um amplo poro apical truncado; apêndices ventrais estaminais biaristados; ovário tetralocular, com um ápice coroado por quatro apêndices ± deltóides persistentes; ausência de intrusões da placenta em cápsulas maduras; e sementes subcocleadas com testa costada. Estas características morfológicas são congruentes com os dados de sequência de DNA que mostram Brasilianthus inseridos na aliança Marcetia da tribo Melastomeae, onde é grupo irmão de Nepsera aquatica. Estes dois gêneros são, por sua vez, grupo irmão de Ernestia pullei e Appendicularia thymifolia. Uma descrição completa de Brasilianthus é apresentada, assim como ilustrações diagnósticas, imagens das plantas no habitat, micrografia eletrônica de varredura de sementes, uma avaliação do estado de conservação com base em critérios da IUCN, e comparações com gêneros relacionados na aliança Marcetia.

show abstract

The quaternary lacustrine deposits of the Serra dos Carajás (state of Pará, Brazil): ages and other preliminary results

Cited by 24 publications

References 13 publications

Neotropical seasonally dry forests and Quaternary vegetation changes

Neotropical seasonally dry forests and Quaternary vegetation changes

International Lateinamerika-Kolloquium 2009

Brasilianthus (Melastomataceae), a new monotypic genus endemic to ironstone outcrops in the Brazilian Amazon

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