Sifeddine Abdelfettah auteur aut IRD Meyers P. A. auteur aut IRD Cordeiro R. C. auteur aut IRD Albuquerque A. L. S. auteur aut IRD Bernardes M. auteur aut IRD Turcq Bruno auteur aut IRD Abrao J. J. auteur aut IRD text journalArticle eng text/pdf born digital access Elemental and isotopic compositions of organic matter in surficial sediments from five transects across Lagoa do Caco (Brazil) were analyzed to identify the depth-related processes that affect the production and deposition of sedimentary organic matter in this shallow tropical lake. Each of four transverse transects began at a margin dominated by aquatic macrophytes (Eleocharis), crossed the central deep part of the lake, and terminated in the opposite, macrophyte-dominated margin. In each transect, TOC concentrations, C/N ratios, and delta C-13 values decreased between 0 and 4 m, whereas delta N-15 values increased. The variables remained stable in sediment from 4 m water depth to the center of the lake at 10 m. The depth-related patterns reflect differences in both the delivery and the deposition of organic matter in the lake. Organic matter is produced in abundance in the marginal area by emersed and submerged macrophyte vegetation that diminishes with depth and disappears at 4 meters. After the disappearance of macrophytes, organic matter is produced at low rates principally by open-lake phytoplankton. Drawdown of dissolved oxygen is high in the lake margins, but it is low in the oligotrophic open waters of the lake. Preservation of organic matter is consequently better in sediments of the lake margins than in deep waters. The depth-related pattern of organic matter delivery and deposition in the sediments of Lagoa do Caco, in which water levels are sensitive to groundwater fluctuations, shows that the elemental and isotopic compositions of sediment organic matter can provide a record of changes in the paleohydrology of this and other similar shallow lake systems. specialized Sediment organic carbon concentration C-org/N-total values delta C-13(org) delta N-15(total) Lacustrine sedimentation Lacustrine organic matter sources 064 036 45 3 385-396 2011 0921-2728 https://www.documentation.ird.fr/hor/fdi:010053515 10.1007/s10933-011-9506-0 0921-2728 [F B010053515] https://www.documentation.ird.fr/hor/fdi:010053515 https://www.documentation.ird.fr/intranet/publi/2011/05/010053515.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-05-31 2017-08-23 fdi:010053515 fre