Habitabilidad primaria del fitoplancton en el Golfo de Ana María, Cuba
Fecha
2015-06-25
Autores
Alvarez Salgueiro, Jessica
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Editor
Universidad Central "Marta Abreu" de Las Villas
Resumen
En el presente trabajo se desarrolla y exponen los resultados de un índice de habitabilidad que cuantifica las potencialidades para la productividad primaria de fitoplancton en nueve estaciones del golfo de Ana María en octubre de 2011, considerando una función de radiación (Radiación Fotosintéticamente Activa (RFA) + Ultravioleta (UV)) y una para el nutriente limitante (Fósforo Reactivo Soluble (PRS)) como los principales factores ambientales que pudieras controlar el proceso. La función de radiación se estimó a partir de un modelo de fotosíntesis, utilizando las irradiancia espectrales obtenidas en los horarios de 1:00 PM y 4:00 PM con la herramienta computacional TUV4.6. Se determinó el tipo óptico de agua de cada estación, a partir del coeficiente de atenuación promedio de la RFA y la profundidad de Secchi. La función de nutrientes fue un índice de eutrofia que considera el nutriente limitante. Se obtuvo un predominio de las aguas C5 oligotróficas. La habitabilidad del fitoplancton en la región mostró una discreta variación espacial y temporal en las escalas analizadas, la cual parece estar principalmente limitada por los nutrientes. La estación 101 y la 27, presentaron el mayor y menor valor de habitabilidad respectivamente. De forma general el índice muestra valores intermedios en la escala de 0-1 y la distribución espacial de los valores del mismo se corresponden con la distribución de la concentración de clorofila a en la zona de estudio.
In this work is developed and presented the results of a habitability index that quantifies the potential for primary productivity of phytoplankton in nine stations of the gulf of Ana Maria in October 2011. We consider a function of radiation (photosynthetically active radiation (PAR)+Ultraviolet (UV)) and the limiting nutrient (reactive soluble phosphorus (RSP)) as the main environmental factors that could control the process. The role of radiation was estimated from a model of photosynthesis, using the spectral irradiance obtained for 1:00 PM and 4:00 PM with the TUV4.6 computational tool. Was determined the optical water type of each stations through the average attenuation coefficient of the PAR and the Secchi depth. The nutrient function was an eutrophication index that consider the limiting nutrient. A predominance of C5 and oligotrophic water was obtained. The habitability of phytoplankton in the region showed a discrete spatial and temporal variation in the analyzed scales, which seems to be mainly limited by nutrients. Stations 101 and 27, showed the highest and lowest value of habitability, respectively. Generally the index shows intermediate values in the range of 0-1 and spatial distribution of the values thereof correspond to the distribution of chlorophyll a concentration in the study area.
In this work is developed and presented the results of a habitability index that quantifies the potential for primary productivity of phytoplankton in nine stations of the gulf of Ana Maria in October 2011. We consider a function of radiation (photosynthetically active radiation (PAR)+Ultraviolet (UV)) and the limiting nutrient (reactive soluble phosphorus (RSP)) as the main environmental factors that could control the process. The role of radiation was estimated from a model of photosynthesis, using the spectral irradiance obtained for 1:00 PM and 4:00 PM with the TUV4.6 computational tool. Was determined the optical water type of each stations through the average attenuation coefficient of the PAR and the Secchi depth. The nutrient function was an eutrophication index that consider the limiting nutrient. A predominance of C5 and oligotrophic water was obtained. The habitability of phytoplankton in the region showed a discrete spatial and temporal variation in the analyzed scales, which seems to be mainly limited by nutrients. Stations 101 and 27, showed the highest and lowest value of habitability, respectively. Generally the index shows intermediate values in the range of 0-1 and spatial distribution of the values thereof correspond to the distribution of chlorophyll a concentration in the study area.
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Palabras clave
Fitoplancton, Golfo de Ana María, Índice de Habitabilidad, Nutrientes, Radiación, Phytoplankton, Gulf of Ana Maria, Habitability Index, Nutrients, Radiation