@Article{FreitasACCTGVCLBATT:2020:GlTrMi,
               author = "Freitas, Lucas and Appolinario, Luciana and Calegario, Gabriela 
                         and Campe{\~a}o, Mariana and Tschoeke, Diogo and Garcia, Gizele 
                         and Ven{\^a}ncio, Igor Martins and Cosenza, Carlos A. N. and 
                         Leomil, Luciana and Bernardes, Marcelo and Albuquerque, Ana Luiza 
                         and Thompson, Cristiane and Thompson, Fabiano",
          affiliation = "{Universidade Federal do Rio de Janeiro (UFRJ)} and {Universidade 
                         Federal do Rio de Janeiro (UFRJ)} and {Universidade Federal do Rio 
                         de Janeiro (UFRJ)} and {Universidade Federal do Rio de Janeiro 
                         (UFRJ)} and {Universidade Federal do Rio de Janeiro (UFRJ)} and 
                         {Universidade Federal do Rio de Janeiro (UFRJ)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal 
                         do Rio de Janeiro (UFRJ)} and {Universidade Federal do Rio de 
                         Janeiro (UFRJ)} and {Universidade Federal Fluminense (UFF)} and 
                         {Universidade Federal Fluminense (UFF)} and {Universidade Federal 
                         do Rio de Janeiro (UFRJ)} and {Universidade Federal do Rio de 
                         Janeiro (UFRJ)}",
                title = "Glacial-interglacial transitions in microbiomes recorded in 
                         deep-sea sediments from the western equatorial Atlantic",
              journal = "Science of the Total Environment",
                 year = "2020",
               volume = "746",
                pages = "e140904",
                month = "Dec.",
             keywords = "Metagenomics, Sediment core, Bioindicator, Amazon river, 
                         Microbiome modulation.",
             abstract = "In the late Quaternary, glacial-interglacial transitions are 
                         marked by major environmental changes. Glacial periods in the 
                         western equatorial Atlantic (WEA) are characterized by high 
                         continental terrigenous input, which increases the proportion of 
                         terrestrial organic matter (e.g. lignin, alkanes), nutrients (e.g. 
                         iron and sulphur), and lower primary productivity. On the other 
                         hand, interglacials are characterized by lower continental 
                         contribution and maxima in primary productivity. Microbes can 
                         serve as biosensors of past conditions, but scarce information is 
                         available on deep-sea sediments in the WEA. The hypothesis put 
                         forward in this study is that past changes in climate conditions 
                         modulated the taxonomic/functional composition of microbes from 
                         deep sediment layers. To address this hypothesis, we collected 
                         samples from a marine sediment core located in the WEA, which 
                         covered the last 130 kyr. This region is influenced by the 
                         presence of the Amazon River plume, which outputs dissolved and 
                         particulate nutrients in vast oceanic regions, as well as the 
                         Parnaiba river plume. Core GL-1248 was analysed by shotgun 
                         metagenomics and geochemical analyses (alkane, lignin, perylene, 
                         sulphur). Two clusters (glacial and interglacial-deglacial) were 
                         found based on taxonomic and functional profiles of metagenomes. 
                         The interglacial period had a higher abundance of genes belonging 
                         to several sub-systems (e.g. DNA, RNA metabolism, cell division, 
                         chemotaxis, and respiration) that are consistent with a past 
                         environment with enhanced primary productivity. On the other hand, 
                         the abundance of Alcanivorax, Marinobacter, Kangiella and aromatic 
                         compounds that may serve as energy sources for these bacteria were 
                         higher in the glacial. The glacial period was enriched in genes 
                         for the metabolism of aromatic compounds, lipids, isoprenoids, 
                         iron, and Sulphur, consistent with enhanced fluvial input during 
                         the last glacial period. In contrast, interglacials have increased 
                         contents of more labile materials originating from phytoplankton 
                         (e.g. Prochlorococcus). This study provides new insights into the 
                         microbiome as climatic archives at geological timescales.",
                  doi = "10.1016/j.scitotenv.2020.140904",
                  url = "http://dx.doi.org/10.1016/j.scitotenv.2020.140904",
                 issn = "0048-9697",
             language = "en",
           targetfile = "freitas_glacial.pdf",
        urlaccessdate = "27 abr. 2024"
}