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THECAMOEBIANS (TESTACEOUS RHIZOPODS) FROM A TROPICAL LAKE: LA FE RESERVOIR, ANTIOQUIA, COLOMBIA / Rizópodos testáceos (tecamebas) en la Represa La Fe, Antioquia, Colombia

Jaime Escobar, José Ignacio Martínez and Luis Norberto Parra
Caldasia
Vol. 27, No. 2 (Diciembre 30 de 2005), pp. 293-298
Stable URL: http://www.jstor.org/stable/23641647
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
THECAMOEBIANS (TESTACEOUS RHIZOPODS) FROM A TROPICAL LAKE: LA FE RESERVOIR, ANTIOQUIA, COLOMBIA / Rizópodos testáceos (tecamebas) en la Represa La Fe, Antioquia, Colombia
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Abstract

This research describes thecamoebians and explores their utility as environmental bioindicators on La Fe Reservoir, Antioquia, Colombia. Nineteen dredge samples were collected at the sediment-water interface, with a cylindrical dredge in March and October 2001. Temperature, pH, conductivity and total dissolved solids were recorded in situ both at depth and at surface for each sample locality. Counting of thecamoebians was done in the >63μm size fraction until 200 thecamoebians per sample were identified. A total of 6 genera, 14 species and 25 sub-species were found at La Fe Reservoir. Arcella vulgaris and Centropyxis aculeata dominate most of the samples. This study opens the possibility for additional research with thecamoebians as bioindicators of limnological physical parameters in tropical water bodies and calls for a further explanation for the occurrence of A. vulgaris and C. aculeata as the dominating species on this tropical reservoir. Se realiza un inventario de los rizópodos testáceos (tecamebas) del embalse La Fe y se explora su utilidad como bioindicadores ambientales en aguas continentales tropicales. Diecinueve muestras de sedimento fueron colectadas en marzo y octubre de 2001. Se registraron en cada sitio de muestreo la profundidad y las variables físicas: pH, temperatura, conductividad y sólidos totales disueltos (TDS), tanto en superficie como en profundidad. El conteo de las tecamebas se realizó en la fracción >63μm hasta que un total de 200 tecamebas por muestra fueran identificadas. Un total de seis géneros, 14 especies y 25 subespecies fueron encontradas en el embalse La Fe. Las especies Arcella vulgaris y Centropyxis aculeata dominaron la mayoría de las muestras. Este estudio abre la posibilidad para investigaciones posteriores utilizando las tecamebas como bioindicadores de parámetros físicos ambientales en aguas continentales tropicales e invita a estudios posteriores para explicar la dominancia de A. vulgaris y C. aculeata en este embalse tropical.

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