Matching field-based ranges in brackish water gradients with experimentally derived salinity tolerances of Conrad’s false mussel (Mytilopsis leucophaeata cochleata) and zebra mussel (Dreissena polymorpha)

Population density in relation to salinity for Mytilopsis leucophaeata cochleata (regression line: Y = 3373.3 + 12.5X + 134.2X2 ; p=0.012) and Dreissena polymorpha (regression line Y = -9729.7 + 9330.4X – 1854.1X2 ; p=0.494) in the North Sea canal, together with the observations of Van Couwelaar and Van Dijk (1989), M. l. cochleata (regression line: Y = 69.8 + 483.3X + 52.8X2 ; p=0.467) and D. polymorpha (regression line: Y = 1221.3 – 15.2X – 81.1X2 ; p=0.283).