I policheti dello stagno di Càlic (Alghero-Sardegna). Evoluzione a medio termine dei popolamenti

Resum

Polychaete distribution on soft bottorns of the Calich Lagoon has been studied. Medium term variations have been analyzed with samples carried out to distance of 8 years. From a situation enough diversified, but gradual, along the gradient external inside of the lagoon in 1988, the polychaete community shows a wider homogeneity in 1995 when the inside stations, colonized by a typical brackish and organically enriched water fauna appears clearly separate from the external ones.