Consulta: subjectFacets:"Palaeofires"
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A Holocene pollen record of savanna establishment in coastal Amapá
Provedor de dados: 42
Autores: Toledo,Mauro B. de; Bush,Mark B.
The main goal of this study was to investigate how climate and human activities may have influenced ecotonal areas of disjoint savannas within Brazilian Amazonia. The fossil pollen and charcoal records of Lake Márcio (Amapá) were used to provide a Holocene palaeoecological history of this region. Detrended correspondence analysis (DCA) was used to enhance the patterns of sample distribution along the sediment core. A marked vegetation change from closed forests with swamp elements to open flooded savanna at c. 5000 yrs BP was evident from the pollen record. Charcoal analysis revealed a pattern of increased accumulation of particles coincident with the establishment of savannas, suggesting higher fire frequency and human impacts near the lake. A 550-year...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollen record; Palaeofires; Amazonia; Savannas; Climate change; Palaeoecology.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200013