Consulta: creatorFacets:"Jasper,André"
Registros recuperados: 6
Data/hora: 12/06/2024 00:34:11

Changes of wood anatomical characters of selected species of Araucaria- during artificial charring - implications for palaeontology
Provedor de dados: 39
Autores: Osterkamp,Isa Carla; Lara,Daniela Müller de; Gonçalves,Thaís Alves Pereira; Kauffmann,Marjorie; Périco,Eduardo; Stülp,Simone; Machado,Neli Teresinha Galarce; Uhl,Dieter; Jasper,André.
ABSTRACT Charcoal is widely accepted as evidence of the occurrence of palaeo-wildfire. Although fossil charcoal remains have been used in many studies, investigation into the anatomical changes occurring during charring are few. The present study analyses changes in selected anatomical characters during artificial charring of modern wood of three species of the genus Araucaria (i.e. Araucaria angustifolia, Araucaria bidwillii and Araucaria columnaris). Wood samples of the studied species was charred under controlled conditions at varying temperatures. Measurements of anatomical features of uncharred wood and artificial charcoal were statistically analysed. The anatomical changes were statistically correlated with charring temperatures and most of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Araucariaceae; Araucaria angustifolia; Araucaria bidwillii; Araucaria columnaris; Charcoal; Wood.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200198

A família Cactaceae na Bacia Hidrográfica do Rio Taquari, RS, Brasil
Provedor de dados: 39
Autores: Bruxel,Juliane; Jasper,André.
O levantamento das espécies da família Cactaceae na Bacia Hidrográfica do Rio Taquari, RS, Brasil foi realizado com o objetivo de conhecer a diversidade e a distribuição desta importante família botânica, uma vez que não existem dados sobre a mesma para a região. Foram encontradas 11 espécies distribuídas em cinco gêneros: Cereus hildmannianus K. Schumann, Lepismium cruciforme (Vellozo) Miquel, Lepismium warmingianum (K. Schumann) Barthlott, Lepismium houlletianum (Lemaire) Barthlott, Lepismium lumbricoides (Lemaire) Barthlott, Rhipsalis floccosa ssp. pulvinigera (G.A. Lindberg) Barthlott &amp;amp; N.P. Taylor, Rhipsalis teres (Vellozo) Steudel, Rhipsalis cereuscula Haworth, Parodia ottonis (Lehmann) N.P. Taylor, Parodia haselbergii (Haage ex. Ruempler)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cactaceae; Diversidade; Bacia Hidrográfica do Rio Taquari; Levantamento.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062005000100008

Charcoal remains from a tonstein layer in the Faxinal Coalfield, Lower Permian, southern Paraná Basin, Brazil
Provedor de dados: 42
Autores: Jasper,André; Uhl,Dieter; Guerra-Sommer,Margot; Abu Hamad,Abdalla M. B; Machado,Neli T. G.
Fossil charcoal has been discovered in the Faxinal Coalfield, Early Permian, Rio Bonito Formation, in the southernmost portion of the Paraná Basin, Brazil. Three types of pycnoxylic gymnosperm woods recovered from a single tonstein layer are described and confirm the occurrence of paleowildfire in this area. A decrease of the charcoal concentration from the base to the top within the tonstein layer indicates that the amount of fuel declined during the deposition probably due to the consumption of vegetation by the fire. The presence of inertinite in coals overlying and underlying the tonstein layer indicates that fire-events were not restricted to the ash fall interval. The integration of the new data presented in the current study with previously...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Charcoal; Gymnosperms; Volcanic ashes; Coal deposits; Gondwana; Late Palaeozoic.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200009

The Botrychiopsis genus and its biostratigraphic implications in Southern Paraná Basin
Provedor de dados: 42
Autores: Jasper,André; Guerra-Sommer,Margot; Cazzulo-Klepzig,Miriam; Menegat,Rualdo.
Botrychiopsis has been considered an important floristic element of Westphalian/Artinskian associations of the Paraná Basin. The occurrence of Botrychiopsis in roof-shales of the Rio Bonito Formation in Southern Paraná Basin (Quitéria area), supported by the identification of Botrychiopsis valida, enlarges the genus biochron. Consequently, the stratigraphic hierarchy for Botrychiopsis plantiana and Botrychiopsis valida was defined for the Paraná Basin. Although it is climatically controlled and related to a deglaciation icehouse stage, stratigraphic distribution of the genus presents a substantial climate tolerance, from cold/cool to warm/temperate conditions. A new phytostratigraphic zonation is proposed for the southern portion of the basin that includes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Botrychiopsis; Biostratigraphy; Paraná Basin; Permian; Palaeoclimatology; Gondwana.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400009

Coricladus quiteriensis gen. et sp. nov., a new conifer in Southern-Brazil Gondwana (Lower Permian, Paraná Basin)
Provedor de dados: 42
Autores: Jasper,André; Ricardi-Branco,Fresia; Guerra-Sommer,Margot.
A new taxon of conifers (Coricladus quiteriensis) is described based on megafloristic remains from the roofshale level at the Quitéria Outcrop (Rio Bonito Formation - Lower Permian - Southern Paraná Basin - Rio Grande do Sul - Brazil). This megafloristic community is included in the Botrychiopsis Zone - Botrychiopsis valida Sub-Zone (Kungurian/Roadian). The assemblage, preserved as impressions, do not present remains of epidermic characters, and is composed mainly of isolated vegetative branches with spirally disposed acicular leaves, presenting a conspicuous central vein and also isolated fertile branches with sparse and irregular leaves and terminal cones. Leafless principal branches, organically connected with sterile and fertile branches, are rare....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coricladus quiteriensis; Paleobotany; Taxonomy; Coniferopsida; Gondwana; Lower Permian.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100012

Record of the genus Lycopodites in the Lower Permian of Paraná Basin, Brazil
Provedor de dados: 42
Autores: Salvi,Juliana; Jasper,André; Ricardi-Branco,Fresia; Bernardes-de-Oliveira,Mary Elizabeth C.; Guerra-Sommer,Margot.
The genus Lycopodites, which encompasses the herbaceous forms of the lycopsids, presents broad time and spacial distribution during the Paleozoic in the Northern Hemisphere, with its initial records dating from the European Devonian. As to Gondwanan Paleozoic, to this moment, only Lycopodites amazonica Dolianiti had been reported for the Amazonian Middle Devonian (Curuá Group). Thus, the specimens reported in this study such as Lycopodites sp., coming from sedimentary rocks of the Itararé Subgroup, São Paulo State, and Lycopodites riograndensis sp. nov., collected in Rio Bonito Formation, Rio Grande do Sul, represent the oldest fertile forms recorded for Gondwana and the first ones to be described for the Paraná Basin. Its presence in layers, deposited...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopodites sp.; Lycopodites riograndensis sp. nov.; Gondwana; Lower Permian; Paraná Basin.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300015