Diatom fluxes in a tropical, oligotrophic lake dominated by large-sized phytoplankton
Por:
Ardiles, V, Alcocer, J, Vilaclara, G, Oseguera, LA, Velasco, L
Publicada:
1 ene 2012
Categoría:
Aquatic Science
Resumen:
Alchichica is a warm-monomictic, oligotrophic lake whose phytoplanktonic biomass is dominated by large size (average ca. 55 mu m) diatoms. The fast sinking phytoplankton leads to silica, and other nutrient exportation out of the productive zone of the lake. The aim of the present study was to identify and measure the sedimentation fluxes of the diatom species and their temporal dynamics to better understand the magnitude of silica and carbon fluxes. Sediment-traps were exposed at three different depths and collected monthly. A total of 13 diatom species were observed in the traps. The maximum diatom flux was in February (304 x 10(6) cells m(-2) day(-1)) related to the winter diatom bloom. The diatom silica (DSi) fluxes varied from 2.2 to 2,997 mg m(-2) day(-1) and the diatom carbon (DC) fluxes from 1.2 to 2,918 mg m(-2) d(-1). Cyclotella alchichicana was the main contributor (> 98%) to the total DSi and DC fluxes. The annual diatom (15 x 10(9) cells m(-2) year(-1)), DSi (147 g m(-2) ye
Filiaciones:
Ardiles, V:
Univ Nacl Autonoma Mexico, Programa Posgrad Ciencias Mar & Limnol, Tlalnepantla 54090, Estado De Mexic, Mexico
Alcocer, J:
Univ Nacl Autonoma Mexico, FES Iztacala, Proyecto Invest Limnol Trop, Tlalnepantla 54090, Estado De Mexic, Mexico
Vilaclara, G:
Univ Nacl Autonoma Mexico, FES Iztacala, Proyecto Invest Limnol Trop, Tlalnepantla 54090, Estado De Mexic, Mexico
Oseguera, LA:
Univ Nacl Autonoma Mexico, Programa Posgrad Ciencias Mar & Limnol, Tlalnepantla 54090, Estado De Mexic, Mexico
Univ Nacl Autonoma Mexico, FES Iztacala, Proyecto Invest Limnol Trop, Tlalnepantla 54090, Estado De Mexic, Mexico
Velasco, L:
Univ Nacl Autonoma Mexico, Programa Posgrad Ciencias Biol, Tlalnepantla 54090, Estado De Mexic, Mexico
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