Distribution and ecology of benthic foraminifera in the Santoña estuary, Spain

The living and dead assemblages in the Santoña estuary were studied seasonally order to determine distribution abundance of benthic foraminifera this area. Samples collected from Winter 1983 summer 1985 document seasonal variation faunas various ecological factors intertidal zone. Salinity is thought be main control two different biofacies characterising upper lower areas have been defined. Ammonia beccarii Haynesina germanica are most dominant forms throughout with Miliammina fusca as co-dominant Quinqueloculina seminulum estuary. species also but latter agglutinated indigenous component much more abundant. This compositional difference caused by production rates change environmental conditions within analysed compared using Fisher a diversity index, Triangular plot wall types Sanders similarity index.