The water reservoir La Playa (upper basin of the Chicamocha River) is a receptor system of residual water and works as a flow regulator to optimize an irrigation district. Although, it is a strategic system, there is no information about water quality. The plankton structure and relationship with physical and chemical variables was evaluated for two contrasting hydro-climatic periods (October 2011 and February 2012) and three stations (lacustrine, transition and riverine). According to principal component analysis during high rainfall oxygen concentration increased and lower transparency was recorded; during the dry season, conductivity was higher but phosphorus concentration was lower. Twenty-one species of planktonic algae and ten species of zooplankton were identified. The highest abundance was for Coelastrum microporum (74 %), Euglena sp. (21 %), Keratella tropica (79 %) and Metacyclops mendocinus (32 %). On the temporal scalel, no replacement of dominant species was found. This is considered indicative of their high trophic level and tolerance to variations in dissolved oxygen, pH and electrical conductivity. Despite the observed high environmental stress (physical and chemical fluctuations and concentration of organic load), these species are able to adapt to these changes.
Abstract (es):
El embalse La Playa (cuenca alto del río Chicamocha, Boyacá), es receptor de aguas residuales y funciona como regulador de caudal con fines de optimizar un distrito de riego. A pesar de ser un sistema estratégico no hay información de su estado de calidad. Se evaluó la estructura del plancton y la relación con algunas variables físicas y químicas en dos épocas hidro-climáticas contrastantes (octubre 2011, febrero 2012) y en tres estaciones (zona riverina, zona transición y zona lacustre). Según el análisis de componentes principales, en lluvias se registró mayor concentración de oxígeno y baja transparencia; en tiempo seco, conductividades altas y baja concentración de fósforo. Se identificaron 21 especies de algas planctónicas y 10 especies de zooplancton. La mayor abundancia fue para Coelastrum microporum (74 %), Euglena sp. (21 %), Keratella tropica (79 %) y Metacyclops mendocinus (32 %). A nivel temporal, no se presentó un reemplazamiento en el dominio de estas especies, por tanto se consideran indicadoras de elevado nivel trófico y de tolerancia a variaciones de oxígeno disuelto, pH y conductividad eléctrica. A pesar que el sistema expresa alta tensión ambiental (fluctuación física y química y a la concentración de carga orgánica), estas especies tienen la capacidad de adaptarse a estos cambios.
Keywords:
Zooplancton, Fitoplancton, Estrés ambiental, Eutroficación, Embalse La Playa (es)
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How to Cite
Rodríguez-Zambrano, A. P., & Aranguren-Riaño, N. J. (2014). Comunidad planctónica de un embalse con alta tensión ambiental: La Playa, cuenca alta del río Chicamocha (Tuta, Boyacá), Colombia. Biota Colombiana, 15(2). Retrieved from https://revistas.humboldt.org.co/index.php/biota/article/view/323
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