Spisula solidissima and Ensis directus. Contour plots of bivalve larval concentrations (no. m–3, concentration scale to right of each panel) plotted with lines of constant temperature. Data were collected over 1-wk period when conditions shifted from upwelling (21 August) to downwelling (23, 24, and 25 August) and back to upwelling (27 August). Left-hand column: S. solidissima;
right-hand column: E. directus