Potencial fotosintético de microalgas reportadas en florecimientos y su relación con las propiedades ópticas de la Bahía de Cienfuegos, Cuba
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Fecha
2015-07-08
Autores
Valle Pombrol, Aimee
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Universidad Central "Marta Abreu" de Las Villas
Resumen
El fitoplancton nerítico contribuye significativamente a la producción primaria en la
zona costera, destacándose las diatomeas y los dinoflagelados. La actividad
antropogénica en la zona costera de Cienfuegos ha afectado los valores de la misma, siendo la eutrofización uno de los fenómenos de mayor impacto ambiental. Dichos eventos generan además modificaciones de las propiedades ópticas del agua, los que no han sido debidamente estudiados en dicha región. En el presente trabajo se utiliza un modelo matemático de Cullen et al. (1992), para cuantificar el potencial fotosintético de géneros de microalgas fitoplanctónicas reportadas en eventos de florecimientos en la Bahía de Cienfuegos y su relación con las propiedades ópticas de la columna de agua. Por lo que se caracterizó espacio-temporalmente la variación del coeficiente de atenuación promedio de la luz, el que fue estimado a partir de la profundidad del disco Secchi. Las propiedades ópticas mostraron variación espacial y temporal con un predominio de las aguas C9 (más oscuras) según la clasificación de Jerlov (1976). Los valores del coeficiente de atenuación presentaron máximos temporales en el período lluvioso del año 2012, en estaciones del Lóbulo Norte de la bahía. Thalassiosira spp. manifestó mayor potencial fotosintético que Prorocentrum spp., siendo máxima en las
aguas C9 y menor en las más claras (I). Los perfiles de tasas de fotosíntesis en lacada género y por tanto con su distribución en la columna de agua.
The neritic phytoplankton contributes significantly to primary production in coastal areas, highlighting the diatoms and dinoflagellates taxon. Anthropogenic activity in the coastal area of Cienfuegos had affected the values of the same, where eutrophication phenomena appear to have the greater environmental impact. These events also changes in the water optical properties, which have not been properly studied in the region. In this work was used a mathematical model of Cullen et al. (1992), to quantify the photosynthetic potential of microalgae genera, which have been reported in phytoplankton blooms in the Cienfuegos Bay and its relation with the optical properties of the water column. Therefore spatio-temporally variation of light attenuation coefficient was characterized, which was estimated based on Secchi disk depth. The optical properties of Cienfuegos Bay presented spatial and temporal variations with a predominance of water C9 (darker) described by Jerlov (1976). The attenuation coefficient values show temporary highs in the rainy season of 2012, in stations of the Northern Lobe. Thalassiosira spp. showed higher photosynthetic potential than Prorocentrum spp. Both genera show higher photosynthetic activity in the C9 water and less for the clearest waters (I). Profiles of photosynthesis rates show correspondence with the photophysiologycal characteristics of each genera and thus with its distribution and abundance into the water column ,
The neritic phytoplankton contributes significantly to primary production in coastal areas, highlighting the diatoms and dinoflagellates taxon. Anthropogenic activity in the coastal area of Cienfuegos had affected the values of the same, where eutrophication phenomena appear to have the greater environmental impact. These events also changes in the water optical properties, which have not been properly studied in the region. In this work was used a mathematical model of Cullen et al. (1992), to quantify the photosynthetic potential of microalgae genera, which have been reported in phytoplankton blooms in the Cienfuegos Bay and its relation with the optical properties of the water column. Therefore spatio-temporally variation of light attenuation coefficient was characterized, which was estimated based on Secchi disk depth. The optical properties of Cienfuegos Bay presented spatial and temporal variations with a predominance of water C9 (darker) described by Jerlov (1976). The attenuation coefficient values show temporary highs in the rainy season of 2012, in stations of the Northern Lobe. Thalassiosira spp. showed higher photosynthetic potential than Prorocentrum spp. Both genera show higher photosynthetic activity in the C9 water and less for the clearest waters (I). Profiles of photosynthesis rates show correspondence with the photophysiologycal characteristics of each genera and thus with its distribution and abundance into the water column ,
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Palabras clave
Algas Marinas, Fitoplacton