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Abstract
Blackfly occurrence was investigated on thirty plain streams of the low plain of the Friuli Venezia Giulia Region (NE Italy). Four species were found: Simulium erythrocephalum, S. angustitarse, S. ornatum, and S. paraequinum. Blackfly diffusion was larger than that reported in previous studies. Associations were found among Simuliidae species, hydrophyte species and water velocity.