02408naa a2200373 a 450000100080000000500110000800800410001902200140006002400540007410000200012824501810014826000090032952012740033865000190161265000160163165000190164765000190166665000130168565000300169865000230172865000180175165000240176965000120179365300140180570000170181970000210183670000180185770000180187570000150189370000220190870000170193070000190194777300680196621876712026-06-25       2022    bl uuuu     u00u1 u    #d  a0895-98117 ahttps://doi.org/10.1016/j.jsames.2022.1037182DOI1 aSCHLEDER, A. A.  aDisentangling sources and variation of organic matter in soda lakes from Nhecolândia (Pantanal, Brazil) based on hydrocarbons and bacterial composition.h[electronic resource]  c2022  aThe Nhecolândia, in the middle of Pantanal-Brazil, is known for the co-existence of soda lakes and freshwater lakes. The distribution and ocurrence of n-alkanes in three cores from the soda and freshwater lakes were studied in order to assess the variation in organic matter. Additionally, variations in bacteria populations were associated with changes in alkalinity or salinity of the studied lakes. Results show a significant change in n-alkanes distribution. Long carbon chain predominated in the uppermost part of the cores (C24 to C33), while short carbon chain prevailed in the deepest parts (C17 to C22), which correspond to ∼3200 yr BP. It is documented that the soda lakes became highly alkaline at some point during the Holocene, causing changes in the microbiota, which is currently dominated by bacteria in the three cores, independently of salinity and alkalinity characteristics. Whereas the NHP and BB2 cores, both from soda lakes, exhibit a relatively high number of different bacteria, with averages of 335 and 300, the BTP core, from a freshwater lake, presented 123 bacteria. Thus, cores from soda lakes show a greater diversity of the bacterial community in comparison to freshwater lakes, despite the existence of an extreme saline environment.  aClimate change  aEnvironment  aHolocene soils  aOrganic matter  aPantanal  aSulfate-reducing bacteria  aMatéria Orgânica  aMeio Ambiente  aMudança Climática  aSulfato  aBiomarker1 aFROEHNER, S.1 aGUERREIRO, R. L.1 aPARRON, L. M.1 aHANSEL, F. A.1 aSÁNEZ, J.1 aMARTINS, C. de C.1 aMALTEMPI, E.1 aBALSANELLI, E.  tJournal of South American Earth Sciencesgv. 114, 103718, 2022.