@Article{FrançaACCRPLFBGF:2015:MuEvTr,
author = "Fran{\c{c}}a, Marlon C. and Alves, Igor Charles C. and Castro,
Darcil{\'e}a Ferreira and Cohen, Marcelo C. L. and Rossetti,
Dilce de F{\'a}tima and Pessenda, Luiz C. R. and Lorente,
Fl{\'a}vio L. and Fontes, Neuza Ara{\'u}jo and Buso Junior,
Ant{\^o}nio {\'A}lvaro and Giannini, Paulo C{\'e}sar Fonseca
and Francisquini, Mariah Izar",
affiliation = "{Universidade Federal do Par{\'a} (UFPA)} and {Universidade
Federal do Par{\'a} (UFPA)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal do Par{\'a} (UFPA)}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade de S{\~a}o Paulo (USP)} and {Universidade de
S{\~a}o Paulo (USP)} and {Universidade Federal do Par{\'a}
(UFPA)} and {Universidade de S{\~a}o Paulo (USP)} and
{Universidade de S{\~a}o Paulo (USP)} and {Universidade de
S{\~a}o Paulo (USP)}",
title = "A multi-proxy evidence for the transition from estuarine mangroves
to deltaic freshwater marshes, Southeastern Brazil, due to
climatic and sea-level changes during the late Holocene",
journal = "Catena",
year = "2015",
volume = "128",
pages = "155--166",
month = "May",
keywords = "Carbon and nitrogen isotopes, Diatoms, Holocene, Palynology,
Sea-level changes, Southeastern Brazil.",
abstract = "The present study investigates a paleo-estuary at the Doce River
Delta, southeastern Brazil, through a multi-proxy approach that
links palynology, diatoms, sedimentology and geochemistry analyses
(i.e., Total C, Total N, \δ13C and \δ15N). These
analyses, temporally synchronized with five radiocarbon ages,
revealed environmental changes from marine to continental over the
last \∼ 7550 years. The studied sedimentary succession
recorded the upward transition from estuarine channel (until ~
7550 cal yr BP) to estuarine central basin (>~ 7550 to ~ 5250 cal
yr BP) deposits, the latter containing increased mangrove
vegetation, marine and marine/brackish water diatoms. The range of
geochemical values (\δ13C = \− 30\− 10,
\δ15N = 2 \− 8 and C/N = 440) also indicate
marine/estuarine organic matter and C3 terrestrial plants to that
time interval. A following period recorded two phases: lake/ria (~
5250 to ~ 400 cal yr BP) and fluvial channel (~ 400 cal yr BP
until modern age). During this stage, mangroves were replaced by
trees/shrubs and herbs/grasses due to the disconnection with the
marine realm. As a result, the corresponding sediments contain
only organic matter sourced from freshwater and C3 terrestrial
plants (\δ13C = \− 29\− 26, \δ15N = 0
\− 8 and C/N = 1045). The equilibrium between fluvial
sediment supply and relative sea-level changes during the Holocene
controlled the morphologic and vegetation changes in the studied
littoral. The estuary became established during the early Holocene
as a resulted of a eustatic sea-level rise, when the fluvial
sediment supply to the coast was relatively lower due to a dry
period. However, during the late Holocene, the climatic force was
more significant to the development of coastal morphology due to a
wet period that caused an increase in sandy sediment supply to
coastal system. Then, the increase of fluvial discharge associated
to a relative sea-level fall caused a marine regression and
shrinkage of mangroves during the late Holocene. The evaluation of
mangrove dynamics according to climatic and sea-level changes
mainly during the late Holocene is essential for the understanding
of their survival ability under future scenarios, with a probable
accelerated sea-level rise and intensification of extreme climatic
events in southeastern Brazil for the next century.",
doi = "10.1016/j.catena.2015.02.005",
url = "http://dx.doi.org/10.1016/j.catena.2015.02.005",
issn = "0341-8162",
language = "en",
targetfile = "Franca_multi.pdf",
urlaccessdate = "02 maio 2024"
}