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Registros recuperados: 5
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Environmental changes in the western Amazônia: morphological framework, geochemistry, palynology and radiocarbon dating data Anais da ABC (AABC)
Horbe,Adriana M.C.; Behling,Hermann; Nogueira,Afonso C.R.; Mapes,Russell.
The sediments from the Coari lake, a “terra firme” lake sculpted into Plio-Pleistocene deposits, and the Acará lake, a flooding-type lake developed on Quaternary sediments in the floodplain of the mid-Solimões river, in the western Amazônia, Brazil, were studied to investigate the environmental condition of their developing. This study includes mineral composition, geochemistry, Pb isotope, palinology, radiocarbon-age and morphological framework of the lakes obtained from SRTM satellite images. The geological and the environmental conditions in the two lakes are highly variable and suggest that their evolution reflect autogenic processes under humid rainforest condition. Although kaolinite, quartz, muscovite, illite, and smectite are the main minerals in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pb isotopes; Lacustrine environment; Paleovegetation; Flooding plain; Holocene.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300008
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Evidences of delayed size recovery in Araucaria angustifolia populations after post-glacial colonization of highlands in Southeastern Brazil Anais da ABC (AABC)
Stefenon,Valdir M.; Behling,Hermann; Gailing,Oliver; Finkeldey,Reiner.
Up to date, little is known about the relationship between historical demography and the current genetic structure of A. Angus As a first effort towards overcoming this lack, microsatellite data scored in six populations and isozyme allele frequencies published for 11 natural stands of this species were analysed in order to assess molecular signatures of populations' demographic history. Signatures of genetic bottlenecks were captured in all analysed populations of southeastern Brazil. Among southern populations, signatures of small effective population size were observed in only three out of 13 populations. Southern populations likely experienced faster recovery of population size after migration onto highlands. Accordingly, current genetic diversity of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Araucaria angustifolia; Genetic bottleneck; Population size recovery; Demographic history; Climate dynamics; Paleobotany.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300005
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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 BABT
Behling,Hermann; Verissimo,Nuno; Bauermann,Soraia; Bordignon,Sergio; Evaldt,Andreia.
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 Araucaria angustifolia which is on the highlands in southern Brazil. The question is whether this occurrence is natural, due to indigenous peoples, or due to plantation by post-Columbian settlers. To trace the origin of this little known southernmost existence of Araucaria angustifolia trees is of particular interest for conservation issues. To address this question we did a vegetation survey and studied a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Late Holocene; Araucaria angustifolia; Pollen analysis; Southern Brazil.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100700
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Model of wetland development of the Amapá coast during the late Holocene Anais da ABC (AABC)
Guimarães,José T.F.; Cohen,Marcelo C.L.; França,Marlon C.; Lara,Rúben J.; Behling,Hermann.
The modern vegetation types, sedimentary sequences, pollen records and radiocarbon dating obtained from three sediment cores from Calçoene Coastal Plain were used to provide a palaeoecological history during the late Holocene of Amapá coastal wetland according to flood regime, sea-level and climatic changes. Based on these records, four phases of vegetation development are presented and they probably reflect the interaction between the flow energy to the sediment accumulation and the brackish/freshwater influence in the vegetation. This work suggests interchanges among time periods characterized by marine and fluvial influence. The longitudinal profile did not reveal the occurrence of mangrove in the sediment deposited around 2100 yr B.P. During the second...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazon river; Climatic changes; Mangrove; Palynology; Sea-level.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200021
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Vegetation and pollen rain relationship from the tropical Atlantic rain forest in Southern Brazil BABT
Behling,Hermann; Negrelle,Raquel R. B..
The relationship between the southern Brazilian tropical Atlantic lowland rain forest and modern pollen rain was studied by pollen traps. The study was carried out on a one hectare plot undisturbed rain forest of the reserve Volta Velha and two secondary forests, ± 50 and 7 years old. About 248 identified tree, shrub and herb species (excluding epiphytes) of 50 families were represented by 126 different pollen and spore types (including non-local taxa). The calculated average influx of pollen rain from the native Atlantic rain forest was 12465 pollen grains per cm² and year. The influx from the ± 50 years old and from the 7 years old secondary forest was relatively low (4112 and 3667 grains per cm² and year, respectively) compared to the undisturbed rain...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Southern Brazil; Modern pollen rain; Tropical Atlantic rain forest; Secondary forest.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500013
Registros recuperados: 5
Primeira ... 1 ... Última
 

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