@Article{ZaniRosCohPesCre:2012:InLaEv,
               author = "Zani, Hiran and Rossetti, D. F. and Cohen, Marcelo and Pessenda, 
                         Luiz Carlos Ruiz and Cremon, {\'E}dipo Henrique",
          affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Influence of landscape evolution on the distribution of floristic 
                         patterns in northern Amazonia revealed by \δ13C data",
              journal = "Journal of Quaternary Science",
                 year = "2012",
               volume = "27",
               number = "8",
                pages = "854--864",
                month = "Nov.",
             keywords = "\δ,13C isotope, climate, landscape evolution, megafan, open 
                         vegetation patches.",
             abstract = "The Amazonian lowlands include large patches of open vegetation 
                         which contrast sharply with the rainforest, and the origin of 
                         these patches has been debated. This study focuses on a large area 
                         of open vegetation in northern Brazil, where \δ13C and, in 
                         some instances, C/N analyses of the organic matter preserved in 
                         late Quaternary sediments were used to achieve floristic 
                         reconstructions over time. The main goal was to determine when the 
                         modern open vegetation started to develop in this area. The 
                         variability in \δ13C data derived from nine cores ranges 
                         from \−32.2 to \−19.6, but with nearly 60% of data 
                         above \−26.5. The most enriched values were detected only 
                         in ecotone and open vegetated areas. The development of open 
                         vegetation communities was asynchronous, varying between estimated 
                         ages of 6400 and 3000 cal a BP. This suggests that the origin of 
                         the studied patches of open vegetation might be linked to 
                         sedimentary dynamics of a late Quaternary megafan system. As 
                         sedimentation ended, this vegetation type became established over 
                         the megafan surface. In addition, the data presented here show 
                         that the presence of C4 plants must be used carefully as a proxy 
                         to interpret dry paleoclimatic episodes in Amazonian areas.",
                  doi = "10.1002/jqs.2602",
                  url = "http://dx.doi.org/10.1002/jqs.2602",
                 issn = "0267-8179",
                label = "lattes: 7888258901938956 5 ZaniRosCohPesCre:2012:InLaEv",
             language = "en",
        urlaccessdate = "30 abr. 2024"
}