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Population dynamics of Heterocypris incongruens (Ramdohr, 1808) (Ostracoda, Cyprididae) in relation to diet type (algae and organic waste) and amount of food

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Population growth patterns of the ostracod, Heterocypris incongruens have been studied using the green alga, Scenedesmus acutus or organic waste from a water treatment plant as food, and using dry weight equivalents of 5.8, 11.6, and 23.2 μg ml−1 for 50 days. H. incongruens, in our study, reproduced only parthenogenetically. The colour of the eggs and the carapace valves differed depending on the type of food. Populations cultured on the algae appeared bright orange-coloured, while those on organic waste were pale yellow. Regardless type and concentration of food, H. incongruens had a long lag phase of about 3 weeks, after which the exponential phase began that continued for the next 20 to 30 days. In treatments containing an algal diet, the density of H. incongruens increased with the increase of food level from 5.8 to 11.6 μg ml−1. However, a further increase in food density did not result in a higher peak of abundance. In the treatments containing organic waste, population density was higher (about 1.6 ind. ml−1) at 5.8 and 11.6 μg ml−1, but it decreased to half this density with a further increase in the amount of food (23.2 μg ml−1). The rate of population increase (r) of H. incongruens ranged from 0.03 to 0.07 per day, depending on food type and concentration. Se estudiaron los patrones de crecimiento poblacional del ostrácodo Heterocypris incongruens utilizando el alga verde Scenedesmus acutus o desechos orgánicos de una planta de tratamiento de aguas residuales como alimento bajo diferentes densidades (como los equivalentes de peso seco de 5,8, 11,6 y 23,2 μg ml−1) durante 50 días. H. incongruens en nuestro estudio sólo se reproduce partenogenéticamente. El color de los huevos y las valvas de los ostrácodos difiere dependiendo del tipo de alimentos. Los cultivados en alga presentaron un color naranja brillante, mientras que los cultivados con residuos orgánicos mostraron un color amarillo pálido. Independientemente del tipo de alimento y la concentración, H. incongruens presentó una larga fase de adaptación de aproximadamente 3 semanas. Una vez que la fase exponencial se inició, esta tuvo una duración de 20 a 30 días. En los tratamientos de la dieta que contienen algas, la densidad de H. incongruens aumentó cuando se elevó la concentración de alimento de 5,8 a 11,6 μg ml−1. Sin embargo, al incrementar la densidad en los alimentos no se reflejó en las abundancias máximas de la población de H. incongruens. Dentro de los tratamientos que contienen residuos orgánicos, la densidad de población fue mayor (alrededor de 1,6 ind. ml−1) a 5,8 y 11,6 μg ml−1, pero se redujo a la mitad con mayor aumento de la densidad de los alimentos (23,2 μg ml−1). La tasa de aumento de la población (r) variaron entre 0,03 a 0,07 por día, dependiendo del tipo de alimentos y la concentración.

Affiliations: 1: Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Mexico City, Mexico; 2: Laboratorio de Zoología Acuática, División de Investigación y Posgrado, Edificio UMF, Universidad Nacional Autónoma de México, Campus Iztacala, AP 314, CP 54090, Tlalnepantla, State of Mexico, Mexico; 3: UIICSE, División de Investigación y Posgrado, Universidad Nacional Autónoma de México, Campus Iztacala, AP 314, CP 54090, Tlalnepantla, State of Mexico, Mexico


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