Estudio de la asociación de ostrácodos en sedimentos actuales de balsas de las Bardenas Reales de Navarra

Laburpena

In this paper we study two cores recovered in two recent ponds (Cortinas and Piezarrey) from Bardenas Reales de Navarra to determine the recent environmental evolution of two ponds having a different facies association. The pond of Cortinas presents greatest stability in a water level through time, with the consequent establishment of the environment for the development of ostracods. Recently, this pond is affected by warm,mesohaline and slightly basic water with high dissolved oxygen content, being abundant Limnocythere inopinata in the living assemblage. The pond of Piezarrey is characterized by having a silting during the last years and the consequent decrease in the water level. This generates very eutrophicathes conditions that would be unfavorable to the maintenance of a rich and diverse ecosystem. The recent influence of warm, oligohaline and basic water with high dissolved oxygen content favors the dominance of Cypridopsis vidua in this pond.