@Article{MoraesFCFPRFBM:2017:LaHoMa,
author = "Moraes, Caio A. and Fontes, Neuza A. and Cohen, Marcelo C. L. and
Fran{\c{c}}a, Marlon Carlos and Pessenda, Luiz C. R. and
Rossetti, Dilce de F{\'a}tima and Francisquini, Mariah I. and
Bendassolli, Jos{\'e} A. and Macario, Kita",
affiliation = "{Universidade Federal do Par{\'a} (UFPA)} and {Universidade
Federal do Par{\'a} (UFPA)} and {Universidade Federal do
Par{\'a} (UFPA)} and {Instituto Federal do Par{\'a}} and
{Universidade de S{\~a}o Paulo (USP)} 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 Fluminense (UFF)}",
title = "Late holocene mangrove dynamics dominated by autogenic processes",
journal = "Earth Surface Processes and Landforms",
year = "2017",
volume = "42",
number = "13",
pages = "2013--2023",
month = "Oct.",
keywords = "C and N isotopes, climate, Holocene, palynology, relative sea
level.",
abstract = "Generally, palaeoenvironmental interpretations consider only
allogenic processes, when autogenic factors may have a strong
influence on proxies of stratigraphic sequences. For instance, the
Holocene history of the vegetation along the southern littoral of
the State of Bahia in north-eastern Brazil is characterized by
mangrove dynamics controlled by allogenic processes. However, over
smaller timescales (similar to 700years), autogenic processes may
have controlled vegetation dynamics and hence observed pollen
distribution. This work proposes tidal channel dynamics as one of
the main cause for changes in pollen assemblage along the studied
stratigraphic profiles during the last centuries, based on
sedimentology, pollen and elemental analysis (C-13, N-15 and C/N)
and radiocarbon dating of sedimentary organic matter from two
cores sampled from an abandoned meander and a tidal flat at the
mouth of the Jucurucu River. One core was sampled from a mangrove
formed during the past similar to 550cal yr bp. Another core
recorded sediments in a varzea forest (swamp seasonally and
permanently inundated by freshwater) located similar to 2.7km from
the current shoreline, which displayed a maximum age of similar to
680cal yr bp. Two facies associations were identified: tidal
channel (A) and tidal flat/oxbow lake (B). This work proposes
allogenic processes as the main driving forces controlling the
wetlands dynamics at the studied site during the Holocene.
However, our data also reveal that part of the changes in
vegetation over the last similar to 700years reflect tidal
channels and tidal flats development, which represent autogenic
processes. The change in timescale analysis from the Holocene to
recent centuries may have weakened the influence of allogenic
factors. However, this needs interpretation with reference to the
spatial scale of the depositional environment as the larger the
depositional system analyzed, the stronger the influence of
autogenic processes on stratigraphic sequences over longer
timescales.",
doi = "10.1002/esp.4167",
url = "http://dx.doi.org/10.1002/esp.4167",
issn = "0197-9337",
language = "en",
targetfile = "moraes_late.pdf",
urlaccessdate = "27 abr. 2024"
}