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Figure 2


Fig. 2. Red-phase and green-phase male crabs respond differently to a hyposalinity challenge. Crabs were acclimated to 33 ppt seawater (SW) for one week and then transferred to 5 ppt SW for 24 h. (A) Some red-phase males (37 and 30%) had detectable MF in 33 ppt SW at 11°C and 18°C, respectively. Hyposalinity treatment increased the percentage (94 and 92%, respectively; N=12; ***P<0.001; Fisher's exact test). (B) Red-phase males with detectable MF had similar MF levels at each temperature and salinity (values ± s.e.m.; P>0.05; N=12). (C) Few green-phase crabs had detectable MF at either temperature in 33 ppt SW. Only one responded to 5 ppt SW at 11°C whereas 100% did at 18°C (N=12; ***P<0.001; Fisher's exact test).