Acanthocyclops americanus (Marsh, 1892), first described in Wisconsin (USA), was discovered shortly thereafter Great Britain and then widely distributed the Palearctic. Its current range includes Europe, North Africa, western central Siberia with largest number of findings along migration tracks aquatic birds. Until recently, northern border 60th parallel, but last decade it has expanded furthe...

The Imboassica lagoon, located in the Municipality of Macaé (RJ), is separated from the sea by a sand bar, and its surroundings are partially occupied by residential areas. This coastal lagoon has undergone environmental degradation due to sewage input and artificial sand bar openings. The temporal and spatial variation of environmental variables and zooplankton were studied monthly for four ye...