Macrozoobenthos del Fiume Silis (Sardegna settentrionale)

This research deals with the composition and structure of macrozoobenthic
community of River Silis, Northern Sardinia.
Samplings, carried out in different periods of the year, allowed
to display the seasonal evolution of communities. Results showed
a scarce diversification of taxa but a well structured community.
The recolonization, after summer drought, was also
observed. At the starting of this process the most resistent organisms
were present, and increasing the flow, new taxa appeared
raising notable values of density. Data, utilized to determine
the water quality by means of E.B.I. method, show that class
of River Silis varies from II-I in the upperstream to III-II in the
downstream. These results point-out a situation of environmental
disturbance due to urban wastes and summer drought.