Pollen Record
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Reconstruction of the Late Pleistocene to Late Holocene vegetation transition using packrat midden and pollen evidence from the Central Mojave Desert
ABSTRACT The Mojave Desert of the American West is characterized by plant species that reflect a unique mixture of winter precipitation and summer monsoon climate. Currently, the Mojave Desert experiences a strong summer monsoonal pattern with weak winter precipitation. Data from pollen and packrat midden analyses have revealed a history of Mojave Desert veg
Acta Bot. Bras.. Publicado em: 12/09/2019
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2. A methodological proposal for the recovery of palynomorphs from snow and ice samples
ABSTRACT The procedures for a set of techniques to recover grains of pollen 26 and spores from liquid samples are described. Liquefied samples of matrices, such as melting lakes, snow and ice, can provide a record of climatic and environmental events at different geographic and temporal scales. The need for standardization of techniques was demonstrated in r
Acta Bot. Bras.. Publicado em: 09/04/2018
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3. Paleoenvironmental evolution of the coastal plain of Southern Brazil: palynological data from a Holocene core in Santa Catarina State
ABSTRACT This paper presents a paleoenvironmental reconstruction from palynological analyses of a sedimentary core of Holocene age, drilled at municipality of Garopaba (Santa Catarina), Southern Brazil. A total of 46 samples was collected for palynological analyses in the 450 cm-long core PCSC-3, as also three samples for radiocarbon dating and granulometric
An. Acad. Bras. Ciênc.. Publicado em: 23/10/2017
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4. Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae)
ABSTRACT The genus Oldenlandia (Rubiaceae) has a conflicting generic delimitation, with representatives that show different floral syndromes. Oldenlandia salzmannii is a marshy herb that is widespread in South America. It is heterostylous, specifically distylous, and self-compatible. Recent molecular phylogenetic studies found that this species forms a clade
Acta Bot. Bras.. Publicado em: 10/11/2016
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5. Late Holocene Vegetation History and Early Evidence of Araucaria angustifolia in Caçapava do Sul in the Lowland Region of Rio Grande do Sul State, Southern Brazil
Little is known about the southernmost occurrence of small areas with Araucaria angustifolia populations in Caçapava do Sul in low elevated areas of Rio Grande do Sul State, about 130 km to the south of to the highlands of southern Brazil where the main distribution of Araucaria is found. This occurrence is about 130 km further south to the main area of Ara
Braz. arch. biol. technol.. Publicado em: 29/04/2016
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6. Composição molecular e origem paleobotânica de âmbares da bacia do Araripe, Formação Santana
The terpenoid composition of seven amber samples from Araripe Basin (Santana Formation, Crato Member) has been analyzed by gas chromatography-mass spectrometry to determine their botanical origin. The diterpenoids, which have been identified in the fossil resin extracts are derived primarily from the abietane class, e.g., dehydroabietane, 4-epidehydroabietol
Química Nova. Publicado em: 2009
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7. A Holocene pollen record of savanna establishment in coastal Amapá
O objetivo deste estudo foi investigar a influência do clima e atividades antrópicas em ecótonos de savanas da Amazônia Brasileira. Os registros palinológicos e de microcarvões do Lago Márcio (Amapá) foram utilizados a fim de fornecer a história paleoecológica desta região durante o Holoceno. Foi utilizada a técnica de DCA (Análise de Correspond
Anais da Academia Brasileira de Ciências. Publicado em: 2008-06
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8. Vegetation and hydrology changes in Eastern Amazonia inferred from a pollen record
Análises de pólen, carvões e datações C foram conduzidas em um testemunho coletado no lago Tapera (Amapá) com o objetivo de interpretar a história paleoambiental desta parte da Amazônia. Uma das técnicas de análises multivariadas, Análise de Correspondência Destendenciada (DCA), foi utilizada a fim de melhor visualizar a distribuição e similari
Anais da Academia Brasileira de Ciências. Publicado em: 2008-03
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9. Guilda de flores de Ãleo do Parque Nacional do Catimbau: fenologia, polinizaÃÃo e sistema reprodutivo
The oil flowers are agrouped in nine families (Iridaceae and Orquidaceae â Monocots; Cucurbitaceae, Malpighiaceae, Plantaginaceae, Calceolariaceae, Solanaceae, Primulaceae and Krameriaceae â Eudicots), whose mais pollinators evolved independently inside two families ao Apoidea: Mellitidae and Apidae, whereas the bees of Centridini, Ctenoplectrini, Tapinota
Publicado em: 2008
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10. Ecologia do bicudo-do-algodoeiro Anthonomus grandis Boheman, 1843 (Coleoptera:Curculionidae) no Cerrado do Brasil Central
The boll weevil Anthonomus grandis Boheman, 1843 (Coleoptera: Curculionidae), one of the main pests of cotton, was introduced in Brazil in 1983. It causes the most serious damage to the crop, such as the falling of the flower buds, destruction of bolls and reduced linter production. The serious pest status of the boll weevil is mainly due to its high reprodu
Publicado em: 2007
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11. ATIVIDADE SAZONAL E MORFOMETRIA DE FORÍDEOS (DIPTERA:PHORIDAE) E SEUS PARASITÓIDES EM COLMÉIAS DA TRIBO MELIPONINI (HYMENOPTERA: APIDAE) NA AMAZÔNIA.
Dipteres of the Phoridae family are important meliponiculture plagues in Amazon. Its larvae are extremely voracious consuming, in a short space of time, all the honey, pollen, and larval food, and eating larvae and pupas of bees. This work verifies the species of phorid that parasite beehives in meliponary in the municipal district of Amazonas (Manaus, Berur
Publicado em: 2006
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12. Sistematica de Acosmium s.l. (Leguminosae, Papilionoideae, Sophoreae) e estudos de morfologia de plantulas e numeros cromossomicos
Acosmium Schott (Leguminosae, Papilionoideae, Sophoreae) is a neotropical genus comprising 18 species. In the last revision of the genus four sections were recognized by Yakovlev, distinguished by the ratio between the length ofthe calyx teeth with the length of the calyx tube, curvature of radic1e and stamens number. The general aim of this thesis was to ev
Publicado em: 2005