Fechar
Metadados

@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 = "30 nov. 2020"
}


Fechar