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Population dynamic and habitat relationships of Aphanius iberus (Valenciennes 1846) in a wetland managed for salt exploitation Aphanius iberus is an endemic cyprinodontid of the Iberian Peninsula highly endangered despite management efforts. We present its population dynamic and relationships with the habitat in a wetland managed for salt exploitation. Density showed a seasonal pattern characterized by maxima values during summer and autumn. Changes in water level that drastically increased the salinity should have produced effects on fish abundance by reducing vegetation mats. The species showed changes in microhabitat use which could be linked with its seasonal abundance and the environmental conditions, at mesohabitat scale. Its abundance showed relationships with vegetation mats and the proximity to embankments, areas probably used as a refuge. Results support the need of the biological criteria in the management of wetland in order to maintain populations of this species. The observed effects should be considered when such populations are exposed to recovery actions.

Dinámica poblacional y relaciones con el hábitat de Aphanius iberus (Valenciennes 1846) en un humedal con salinas en explotación