Particulate Organic Carbon in the Tropical Usumacinta River, Southeast Mexico: Concentration, Flux, and Sources
Por:
Cuevas-Lara, Daniel, ALCOCER, JAVIER, Cortes-Guzman, Daniela, Soria-Reinoso, Ismael F., Garcia-Oliva, Felipe, Sanchez-Carrillo, Salvador, Oseguera, Luis A.
Publicada:
1 jun 2021
Resumen:
Particulate organic carbon (POC) derived from inland water plays an
important role in the global carbon (C) cycle; however, the POC dynamic
in tropical rivers is poorly known. We assessed the POC concentration,
flux, and sources in the Usumacinta, the largest tropical river in North
America, to determine the controls on POC export to the Gulf of Mexico.
We examined the Mexican middle and lower Usumacinta Basin during the
2017 dry (DS) and rainy (RS) seasons. The POC concentration ranged from
0.48 to 4.7 mg L-1 and was higher in the RS, though only in the middle
basin, while remaining similar in both seasons in the lower basin. The
POC was predominantly allochthonous (54.7 to 99.6%). However,
autochthonous POC (phytoplankton) increased in the DS (from 5.1 to
17.7%) in both basins. The POC mass inflow-outflow balance suggested
that floodplains supply (C source) autochthonous POC during the DS while
retaining (C sink) allochthonous POC in the RS. Ranging between 109.1
(DS) and 926.1 t POC d(-1) (RS), the Usumacinta River POC export to the
Gulf of Mexico was similar to that of other tropical rivers with a
comparable water discharge. The extensive floodplains and the ``Pantanos
de Centla'' wetlands in the lowlands largely influenced the POC
dynamics and export to the southern Gulf of Mexico.
Filiaciones:
Cuevas-Lara, Daniel:
Univ Nacl Autonoma Mexico, Programa Posgrad Ciencias Mar & Limnol, Av Univ 3000, Mexico City 04510, DF, Mexico
ALCOCER, JAVIER:
Univ Nacl Autonoma Mexico, FES Iztacala, Grp Invest Limnol Trop, Av Barrios 1, Los Reyes Iztacala 54090, Tlalnepantla, Mexico
Cortes-Guzman, Daniela:
Univ Nacl Autonoma Mexico, Programa Posgrad Ciencias Mar & Limnol, Av Univ 3000, Mexico City 04510, DF, Mexico
Soria-Reinoso, Ismael F.:
Univ Nacl Autonoma Mexico, Programa Posgrad Ciencias Mar & Limnol, Av Univ 3000, Mexico City 04510, DF, Mexico
Garcia-Oliva, Felipe:
Univ Nacl Autonoma Mexico, Inst Invest Ecosistemas & Sustentabilidad, AP 27-3, Morelia 58090, Michoacan, Mexico
Sanchez-Carrillo, Salvador:
CSIC, Museo Nacl Ciencias Nat, Dept Biogeoquim & Ecol Microbiana, Serrano 115 Dpdo, Madrid 28006, Spain
Oseguera, Luis A.:
Univ Nacl Autonoma Mexico, FES Iztacala, Grp Invest Limnol Trop, Av Barrios 1, Los Reyes Iztacala 54090, Tlalnepantla, Mexico
Gold, All Open Access; Gold
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