@Article{RossettiGrCoVaTaYe:2019:RoLaPl,
author = "Rossetti, Dilce de F{\'a}tima and Gribel, Rog{\'e}rio and Cohen,
Marcelo Cancela Lisboa and Valeriano, M{\'a}rcio de Morisson and
Tatumi, Sonia Hatsue and Yee, M{\'a}rcio",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and {Universidade
Federal do Par{\'a} (UFPA)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal de S{\~a}o Paulo
(UNIFESP)} and {Universidade Federal de S{\~a}o Paulo
(UNIFESP)}",
title = "The role of Late Pleistocene-Holocene tectono-sedimentary history
on the origin of patches of savanna vegetation in the middle
Madeira River, southwest of the Amazonian lowlands",
journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",
year = "2019",
volume = "526",
pages = "136--156",
month = "July",
keywords = "Sedimentary processes, Late Pleistocene-Holocene, Environmental
control, Savanna vegetation, Amazonian lowlands.",
abstract = "Savanna patches are features of the Amazonian landscape that have
been long under intense debate, but there are still questions
about the main factors that have determined their establishment
and evolution within the rainforest matrix. In particular, their
geological substrates were poorly documented. The aim of this work
is to reconstruct the tectono-sedimentary history of four savanna
patches in the middle Madeira River, southwest Amazonia, and
discuss its potential control over the development of the savanna
communities. The approach consisted in the integration of
geomorphological, sedimentological, chronological and floristic
data. The results revealed that the savanna substrates are sandy
deposits aged between 118.9 and 35.6 ky, overlain by late
Pleistocene to Holocene muddier successions <25,700 cal yr BP.
Most of the geologically stable and topographically higher
terrains of the geomorphological unit T1 is dominated by forests.
These intermingle with open habitats formed by renewed
sedimentation that were colonized by tree and shrub species of the
Amazonian biome. By contrast, the ground of unit T2 subsided to a
level that allowed the meandering of the main river. This process
resulted in the replacement of the rainforest by open habitats
dominated by savannas with lower richness and diversity than in
the T1 unit, which were dominated by species with wide
distribution in the cerrado biome of Central Brasil. The cerrado
species might have expanded into this region during Pleistocene
drier climatic episodes, but environmental filters shaped by
geological processes determined the floristic contrasts between
units T1 and T2. The lack of competition with Amazonian species
probably constituted an important factor for the preferential
colonization of arboreal and shrubby species from neighboring
cerrados on meandering scroll bars, marginal levees and crevasse
splays of unit T2.",
doi = "10.1016/j.palaeo.2019.04.017",
url = "http://dx.doi.org/10.1016/j.palaeo.2019.04.017",
issn = "0031-0182",
language = "en",
targetfile = "1-s2.0-S0031018218307132-main.pdf",
urlaccessdate = "27 abr. 2024"
}