Macroinvertebrate communities were compared in dredged and undredged areas of the St. Lawrence near Cape Vincent, N.Y., by sampling with a Ponar dredge in 3 seasons. No significant differences existed in numbers of Gammarus spp. and species of Oligochaeta between dredged and undredged areas. The chironomids Pseudochironomus and Stictochironomus spp. were significantly less abundant and Clinotan...