Figure 4. Measurements of δ18O (‰ Vienna Standard Mean Ocean Water, ± 2 standard deviations) made at WiscSIMS from the otolith core to the edge of Transect A (upper panel) and Transect B (lower panel). Solid vertical line indicates approximate transition between juvenile and adult phases (age-7). Dashed vertical lines indicate locations of annual growth zones, with calendar years of formation labeled in italic type (1981-2007).