Abstract
Campsurus nymphs are among the most abundant mayflies in neotropical aquatic habitats. The abundance patterns and secondary production of Campsurus violaceus were analyzed monthly from April 2005 to March 2006 in lakes with different degrees of connectivity in the floodplain of the Middle Paraná River. Significant differences were estimated for the abundance and secondary production of the species among the studied lakes. The patterns in the abundance of nymphs were correlated to substrate characteristics (type of substrate, content of detritus), water transparency, and conductivity of lakes and the variations in the life cycle were related to temperature. Degree of connectivity of lakes was the main factor in determining differences among populations, as it influenced local conditions, finally determining regional dissimilarities in abundance pattern and secondary production for the species. Las ninfas de Campsurus se encuentran dentro de las efímeras más abundantes en ambientes acuáticos neotropicales. Se analizaron los patrones de abundancia y la producción secundaria de Campsurus violaceus en lagunas con diferente nivel de conectividad mensualmente entre Abril de 2005 y Marzo de 2006. Se estimaron diferencias significativas entre las lagunas estudiadas en la abundancia y producción secundaria de la especie. Los patrones de abundancia de ninfas se correlacionaron con las características del sustrato (tipo de sustrato, contenido de detrito), transparencia del agua y conductividad de las lagunas y las variaciones en el ciclo de vida se relacionaron con la temperatura. El nivel de conectividad fue el factor principal en determinar diferencias entre las poblaciones al influenciar las condiciones locales, determinando disimilitudes regionales en el patrón de abundancia y en la producción secundaria de la especie.
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