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Se estudio la clasificacion trofica y la cinetica temporal de las razones P/B, P/R, PPN/PPB y R/B en la zona de represa del embalse Riogrande II (06o35'--06o28'N, 75o32'--75o25'O). Se midieron la produccion primaria bruta (PPB) y la neta (PPN) y la respiracion (R) en cinco profundidades dentro de la zona fotica. Los muestreos se realizaron cada mes, entre julio 2002 y junio 2003. La biomasa fitoplantonica (B) se cuantifico en muestras integradas dentro de la zona fotica. A partir de los valores maximos de los perfiles de PPB y R se establecieron los coeficientes fotosinteticos (PPBmax/B) y metabolico (Rmax/B), y la razon PPBmax/Rmax. La razon entre los valores medios de PPN y PPB muestra que PPN fue 5,2 veces PPB, lo que denota mayor R. Estas consideraciones implican que: 1) la estructura de biomasa presente se mantiene dada la neguentropia relativamente alta; y 2) metabolicamente, el sistema en la zona de represa es mas autotrofico que heterotrofico, comportandose como un sumidero de carbono; por ello, parte de la biomasa no se respira, lo que implica que hay PPN disponible en el embalse. El coeficiente metabolico oscilo alrededor de la unidad, confirmando la relativa estabilidad del ensamblaje fitoplanctonico, con algunos periodos catabolicos, pero primando los de caracter anabolico, lo que efectivamente convierte el sistema en un sumidero de Carbono capaz de mantenerse en condicion estable y resistente a los aportes entropicos.  La razon P/R, con un valor medio de 1,61, muestra claramente un desbalance entre el material producido y el eliminado o consumido por R. Considerando la concentracion de B fitoplanctonica (17,1 A 11,7 mgCl.a.m -3 ), la represa del cuerpo de agua investigado es eutrofica. Los valores medios del coeficiente de asimilacion confirman esta condicion. TROPHIC CLASSIFICATION AND TEMPORAL KINETICS OF Production and conumption IN THE PHOTIC LAYER OF the DAM ZONE IN AN EQUATORIAL COLOMBIAN RESERVOIR. We have studied the kinetic temporal and trophic classification of P/B, P/R, NPP/GPP, and R/B ratios in the dam zone of Riogrande II reservoir II (06o35'57”-- 06o28'79”N, 75o32'17”--75o25'85”O). We measured gross (GPP) and net (NPP) primary production and respiration (R) at five depths within the photic zone. Samples were taken every month between July 2002 and June 2003. Phytoplankton biomass (B) was quantified in samples integrated within the photic zone. From the maximum values of GPP and R profiles, photosynthetic coefficient (GPPmax/B), GPPmax/Rmax ratio and metabolic coefficient (Rmax/B) were established. The ratio between the mean values of NPP and GPP shows that NPP was 5.2 times GPP, reflecting higher R. These considerations imply that: 1) the structure of biomass present remains due to the neguentropy relatively high; and 2) metabolically, the system in the dam zone is more autotrophic than heterotrophic, behaving as a carbon sink; therefore, part of the biomass is not breathed implying that there is available PPN. The metabolic coefficient ranged around the unit, confirming the relative stability of the phytoplankton assemblage, with some catabolic periods, but prioritizing the anabolic character, which effectively present the system as a carbon sink capable to maintain a stable condition and resistant to entropic contributions. P/R ratio, with an average value of 1.61, shows clearly an imbalance between the produced material and the removed or consumed by R. Considering the concentration of phytoplankton biomass (17.1 A 11.7 mgCl.a.m -3 ), the dam zone of the investigated water body is eutrophic. The mean value of photosynthetic coefficient confirms this condition.

oecologia australis

CLASIFICACIÓN TRÓFICA Y CINÉTICA TEMPORAL DE LAS RELACIONES ENTRE PRODUCCIÓN Y CONSUMO EN LA CAPA FÓTICA DE LA PRESA DE UN EMBALSE ECUATORIAL COLOMBIANO