Struttura delle comunità zoobentoniche del Rio Bunnari (Sardegna settentrionale)

Temporal and spatial variation of macrozoobenthic communities
along the Rio Bunnari was studied. Three areas were sampled
according to E.B.I. index method in autumn and spring. In
the high and down stream a notable number of taxa was present,
whereas in the medium zone, down of the artificial lake,
most stenoecious taxa desappeared. This fact could be related
to the high eutrophication level of the lake that represents a
local limited environmental disturbance. Down stream of this zone
the presence of a rich macrozoobenthic community showed
its notable potentialities of homeostasis evidenced also by the
biotic index.