José Tasso F Guimarães

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Long-term human-induced impacts have significantly changed the Amazonian landscape. The most dramatic land cover and land use (LCLU) changes began in the early 1970s with the establishment of the Trans-Amazon Highway and large government projects associated with the expansion of agricultural settlement and cattle ranching, which cleared significant tropical(More)
Limnological characteristics of the Violão and Amendoim lakes, in the Serra dos Carajás, Amazon, were studied interannually (2013-2014). Climate data indicate anomalous conditions during the 2013 rainy period with higher rainfall and lower temperature in the beginning (November). Lake levels were influenced after the first and second hour of each rainfall,(More)
Two sediment cores sampled from a varzea (N 02°34′38′′, W 50°53′17′′) and mangrove area (N 02°35′59′′, W 50°52′08′′) in Amapá littoral, northern Brazil, were studied through pollen and spectrophotometric analysis in order to compare biological and chemical signals of mangrove vegetation recorded by sediments during the late Holocene. According to the pollen(More)
Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ13C, δ15N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Holocene paleoclimatology of the southeast Amazonia. The(More)
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