The Distribution of Amphipoda and Isopoda on the Exposed Shores of the Great Lakes

Abstract

During the summer of 1974 an extensive survey of the shallow water (0-2 m) benthic fauna of the exposed Canadian shores of the Great Lakes was made. This report deals with the distribution of Amphipoda and Isopoda on various substrates in each lake. The amphipods were represented by Pontoporeia affinis, Hyalella azteca, Crangonyx gracilis, C. pseudogracilis, Gammarus fasciatus, G. lacustris and G. pseudolimnaeus. The isopod species were Asellus forbesi, A. intermedius, A. racovitzai and Lirceus lineatus. The distribution of each species is discussed and compared with previously published records.