Influencia espacial del patrón trófico en la estructura de la comunidad zooplanctónica en un embalse tropical urbano en Brasil

Influence of spatial trophic patterns on the zooplankton community structure in a tropical urban reservoir in Brazil

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Juan Carlos Jaramillo Londoño
Simone Paula dos Santos
Ricardo Motta Pinto Coelho

Resumen

Se evaluó el efecto de la entrada de nutrientes, principalmente nitrógeno y fósforo, en la estructura de la comunidad zooplanctónica, incluida la diversidad, la equidad, la dominancia y la riqueza, en la Represa de Pampulha, en la ciudad de Belo Horizonte, Brasil. Las muestras fueron tomadas el 15 de septiembre de 2009 en 23 estaciones de muestreo, cubriendo completamente el embalse. El análisis espacial mostró que la riqueza de especies disminuyó gradualmente en los sitios con mayor cantidad de nutrientes; los copépodos y rotíferos incrementaron su densidad a lo largo de este mismo gradiente espacial (principalmente Thermocyclops decipiensMetacyclops mendocinus y Brachionus calyciflorus). Los mapas temáticos que describen la distribución horizontal de algunas variables mostraron que las áreas con concentraciones de nutrientes más altos estuvieron asociados con un incremento en la dominancia y una disminución de la diversidad y la riqueza de especies.

 

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