@Article{CohenRosPesFriOli:2014:LaPlGl,
author = "Cohen, Marcelo Cancela Lisboa and Rossetti, Dilce de F{\'a}tima
and Pessenda, Luiz Carlos Ruiz and Friaes, Yuri and Oliveira,
Paulo Eduardo de",
affiliation = "Laboratory of Coastal Dynamics, Federal University of Par{\'a} /
Faculty of Oceanography, Federal University of Par{\'a} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Late Pleistocene glacial forest of Humait{\'a} Western Amazonia",
journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",
year = "2014",
volume = "415",
pages = "37--47",
note = "{Informa{\c{c}}{\~o}es Adicionais:
http://dx.doi.org/10.1016/j.palaeo.2013.12.025.}",
keywords = "PALEOCLIMA, Quatern{\'a}rio, Amaz{\^o}nia, POLEN, {\'u}ltimo
glacial.",
abstract = "Glacial-aged vegetation dynamics of the Humait{\'a}Western
Brazilian Amazonia were studied by pollen, sedimentary facies, 14C
dating, \δ13Corg and C/Nmolar. Two sediment cores were taken
to a depth of 10 and 8 m from areas covered by grassland and
dense/open forest, respectively. The deposits represent a
succession of sediment accumulation in active channel (N42,600 cal
yr B.P.), abandoned channel/floodplain (N42,600 to ~39,000 cal yr
B.P.), and oxbow lake sedimentary environments (~39,000 cal yr
B.P. to modern). The predominance of mud sediments, depletion of
\δ13Corg and decrease in C/Nmolar values identify the lake
establishment. In these settings, low energy subaqueous conditions
were developed, locally favoring preservation of a pollen
assemblage representing herbaceous vegetation, some modern taxa
from Amazonia and cold-adapted plants from the Andes represented
by Alnus (211%), Hedyosmum (217%), Weinmannia (018%), Podocarpus
(04%), Ilex (04%) and Drymis (01%), at least between N42,600 and
b35,200 cal yr B.P. The herbs and modern taxa from Amazonia
persisted through the Holocene, while the cold pollen assemblage
became absent. The co-occurrence of Alnus with other cold adapted
plants from the Andes during the late Pleistocene indicates that
Alnus probably penetrated the Western Amazonia lowland or was
growing closer to the study site due to cooler temperatures during
glacial times. The present study presents the first report of a
glacial age forest containing Alnus in areas of the Brazilian
Amazonian lowlands. In addition to its palaeogeographical
importance, this work demonstrates the effectiveness of using a
combination of proxies for reconstructing sedimentary environments
associated with vegetation.",
issn = "0031-0182",
label = "lattes: 0307721738107549 2 CohenRosPesFriOli:2014:LaPlGl",
language = "en",
targetfile = "1-s2.0-S0031018213005622-main.pdf",
urlaccessdate = "03 maio 2024"
}