COMPOSICIÓN DE LA DIETA DE Asplanchna girodi (PLOIMA, ASPLANCHNIDAE) EN UN EMBALSE ALTOANDINO ECUATORIAL EN COLOMBIA BASADO EN OBSERVACIONES DE CAMPO

Juan Jaramillo

Abstract


Asplanchna girodi (de Guerne, 1888) es un rotífero depredador de amplia distribución en ecosistemas dulceacuícolas templados y tropicales. De esta especie en particular, se conoce poco acerca de su dieta y sus preferencias alimenticias en condiciones naturales, ya que la mayoría de trabajos relacionados con este aspecto se han desarrollado en condiciones de laboratorio. Durante un corto programa de monitoreo en el Embalse La García, un embalse alto andino ecuatorial localizado en la región central del departamento de Antioquia (Colombia), en el que esta especie alcanzó una densidad total de 2296,2 ind.L-1, se estudió la composición de la dieta de A. girodi con base solamente en la observación directa, bajo el microscopio, de los organismos contenidos en los estómagos de todos los individuos presentes en las muestras. Entre junio y septiembre de 2014, se tomaron, mensualmente, en tres estaciones de monitoreo, muestras integradas de cinco profundidades en toda la columna de agua, con una botella muestreadora de 10 L de capacidad. El material recogido fue filtrado a través de una red de plancton de 30 µm de ojo de malla. Se encontró que A. girodi, presentó una preferencia trófica amplia que incluyó el forrajeo de un dinoflagelado (Ceratium, Schrank), cinco especies de rotíferos y un cladócero.  Estos resultados llevan a concluir que posiblemente A. girodi sea una especie oportunista, toda vez que el consumo está dirigido a las especies de mayor disponibilidad (en este caso Ceratium), con el mayor ahorro de energía, puesto que no se invierte en la búsqueda de presas específicas y a su vez se constituiría en un importante factor de control de poblaciones de fitoplancton.


THE DIET COMPOSITION OF Asplanchna girodi (PLOIMA, ASPANCHNIDAE) IN AN EQUATORIAL HIGH ANDEAN RESERVOIR IN COLOMBIA BASED ON FIELD OBSERVATIONS:  Asplanchna girodi (de Guerne, 1888) is a predatory rotifer of wide distribution in temperate and tropical freshwater ecosystems. Of this species, little is known about its diet and its food preferences under natural conditions, since most of the work related to this aspect has been carried out under laboratory conditions. During a short monitoring program at La García Reservoir, a high Andean equatorial reservoir located in the central region of the department of Antioquia (Colombia), in which this species reached a total density of 2.296,2 ind.L-1, studied the composition of the A. girodi diet based only on the direct observation, under the microscope, of the organisms contained in the stomachs of all the individuals present in the simples. Between June and September 2014, integrated samples composed of five depths were taken monthly at three monitoring stations in the entire water column, with a sampling bottle of 10 L capacity. The collected material was filtered through a 30µm plankton net of mesh eye. It was found that A. girodi, presented a wide trophic preference that included the foraging of a dinoflagellate (Ceratium, Schrank), five species of rotifers and a cladoceran. These results lead to the conclusion that A. girodi is possibly an opportunistic species, since consumption is directed at the species with the highest availability (in this case Ceratium) and with the greatest energy savings, since no investment is made in the search for specific prey and in turn would become an important factor in controlling phytoplankton populations.


Keywords


diet; feeding selectivity; gut contents; rotifer

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References


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