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Fig. 2. Unidirectional, whole-body Na+ (A) and Cl– (B) uptake rates of Culex quinquefasciatus, a freshwater-obligate (open columns), and C. tarsalis, a euryhaline osmoconformer (filled columns), held in Irvine tapwater, low-NaCl medium for 2 or 7 days, 30 % sea water (SW) for 2 days and acutely transferred to 50 % sea water at 10 h post-transfer. Values are means + S.E.M.; N=5–12 for Na+ uptake, N=6–7 for Cl– uptake. * denotes a significant difference from the tapwater value (P<=0.05). {ddagger} denotes a significant difference from the 30 % seawater value (P<=0.05). § denotes a significant difference between species for a given treatment (P<=0.05).