@article{fdi:010072030,
  title = {{D}ynamics and fluxes of organic carbon and nitrogen in two {G}uiana {S}hield river basins impacted by deforestation and mining activities},
  author = {{G}allay, {M}. and {M}ora, {A}. and {M}artinez, {J}ean-{M}ichel and {G}ardel, {A}. and {L}araque, {A}lain and {S}arrazin, {M}ax and {B}eaucher, {E}ric and {D}oudou, {J}ean-{C}laude and {L}agane, {C}hristelle},
  editor = {},
  language = {{ENG}},
  abstract = {{D}eforestation and mining activities have proven to be very damaging to rivers because these activities disturb the environmental characteristics of rivers. {T}hus, the concentrations of dissolved organic carbon ({DOC}), particulate organic carbon ({POC}), particulate nitrogen ({PN}), and {C}hlorophyll-a ({C}hl-a) were measured monthly during 2 hydrological years in the {M}aroni and {O}yapock {R}ivers to assess the dynamics and fluxes of organic carbon and nitrogen in these 2 {G}uiana {S}hield basins, which have been strongly ({M}aroni) and weakly ({O}yapock) impacted by deforestation and mining activities. {T}he 2-year time series show that {DOC}, {POC}, {PN}, and {C}hl-a concentrations vary seasonally with discharge in both rivers, indicating a hydrologically dominated control. {T}emporal patterns of {DOC}, {POC}, and {PN} indicate that these variables show maximum concentrations in rising waters due to the yield of organic matter and nitrogen accumulated in soils, which are incorporated into the rivers during rainfall. {H}owever, the {C}hl-a concentrations were at a maximum during low-water stages. {T}he {C}/{N} and {C}/{C}hl-a ratios also showed a seasonal trend, with lower values during the low water periods due to an increase in algal biomass. {D}uring high water, the {POC} in both rivers is the result of terrestrial organic matter, whereas during low-water autochthonous organic matter can reach up to 34% of the {POC}. {T}he mean annual fluxes of {TOC} and {PN} were higher (4.56 x 10(5) ton{C} year(-1) and 1.77 x 10(4) ton{N} year(-1), respectively) in the {M}aroni {R}iver than those (1.84 x 10(5) ton{C} year(-1) and 0.54 x 10(4) ton{N} year(-1), respectively) in the {O}yapock {R}iver. {H}owever, the specific fluxes of {DOC}, {POC}, and {PN} from both basins were nearly the same. {A}lthough gold mining activities are performed in both basins, there is no conclusive evidence regarding the impact of these activities on the dynamics of organic matter and particulate nitrogen in the {M}aroni and {O}yapock {R}ivers.},
  keywords = {{C}hl-a ; fluxes ; {F}rench {G}uiana ; mining ; {PN} ; {TOC} ; {GUYANE} {FRANCAISE}},
  booktitle = {},
  journal = {{H}ydrological {P}rocesses},
  volume = {32},
  numero = {1},
  pages = {17--29},
  ISSN = {0885-6087},
  year = {2018},
  DOI = {10.1002/hyp.11394},
  URL = {https://www.documentation.ird.fr/hor/fdi:010072030},
}