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Figure 1


Fig. 1. Plasma sodium (Na+) (mEq l–1) (A,B) and plasma chloride (Cl–) concentrations (µEq l–1) (C,D) in ammocoetes (white bars) and transformers (grey bars) of P. marinus. (A,C) Ammocoetes and transformers (stages 3–5) acclimated to freshwater (FW) and 25{per thousand} salinity and sampled from the Fort River, MA, USA (hatched bars). (B,D) Ammocoetes and transformers (stage >=6) acclimated to deionized water (DW), freshwater (FW) or saline water of 10, 20, 30 and 35{per thousand}. Bars with like characters are not significantly different (ANOVA; P<0.05). Upper and lower case characters are used for transformers and ammocoetes, respectively, in B and D. Asterisks indicate a significant difference from the ammocoetes at a given salinity.





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