@article{fdi:010053515,
  title = {{D}elivery and deposition of organic matter in surface sediments of {L}agoa do {C}aco ({B}razil)},
  author = {{S}ifeddine, {A}bdelfettah and {M}eyers, {P}. {A}. and {C}ordeiro, {R}. {C}. and {A}lbuquerque, {A}. {L}. {S}. and {B}ernardes, {M}. and {T}urcq, {B}runo and {A}brao, {J}. {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{E}lemental and isotopic compositions of organic matter in surficial sediments from five transects across {L}agoa do {C}aco ({B}razil) were analyzed to identify the depth-related processes that affect the production and deposition of sedimentary organic matter in this shallow tropical lake. {E}ach of four transverse transects began at a margin dominated by aquatic macrophytes ({E}leocharis), crossed the central deep part of the lake, and terminated in the opposite, macrophyte-dominated margin. {I}n each transect, {TOC} concentrations, {C}/{N} ratios, and delta {C}-13 values decreased between 0 and 4 m, whereas delta {N}-15 values increased. {T}he variables remained stable in sediment from 4 m water depth to the center of the lake at 10 m. {T}he depth-related patterns reflect differences in both the delivery and the deposition of organic matter in the lake. {O}rganic matter is produced in abundance in the marginal area by emersed and submerged macrophyte vegetation that diminishes with depth and disappears at 4 meters. {A}fter the disappearance of macrophytes, organic matter is produced at low rates principally by open-lake phytoplankton. {D}rawdown of dissolved oxygen is high in the lake margins, but it is low in the oligotrophic open waters of the lake. {P}reservation of organic matter is consequently better in sediments of the lake margins than in deep waters. {T}he depth-related pattern of organic matter delivery and deposition in the sediments of {L}agoa do {C}aco, 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.},
  keywords = {{S}ediment organic carbon concentration ; {C}-org/{N}-total values ; delta ; {C}-13(org) ; delta {N}-15(total) ; {L}acustrine sedimentation ; {L}acustrine ; organic matter sources},
  booktitle = {},
  journal = {{J}ournal of {P}aleolimnology},
  volume = {45},
  numero = {3},
  pages = {385--396},
  ISSN = {0921-2728},
  year = {2011},
  DOI = {10.1007/s10933-011-9506-0},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053515},
}