The ionic composition of the haemolymph and the urine ofGecarcoidea natalis supplied with either freshwater or saline (70%seawater) for drinking for 30-50 days
| . | Drinking freshwater (N=8) . | . | Drinking saline (N=7) . | . | |||
|---|---|---|---|---|---|---|---|
| . | Haemolymph . | Urine . | Haemolymph . | Urine . | |||
| Osmolality (mosmol kg-1) | 799±29a | 794±29a | 1158±28b | 1147±23b | |||
| [Na+] (mmol l-1) | 374±12a | 387±15a | 542±12b | 526±8b | |||
| [K+] (mmol l-1) | 7.5±0.4a,b | 7.1±0.5a | 9.6±0.5b | 8.7±0.7a,b | |||
| [Ca2+] (mmol l-1) | 15.4±0.7a | 9.4±1.5b | 22.0±0.7c | 13.0±0.7a,b | |||
| [Mg2+] (mmol l-1) | 9.9±1.2a | 12.0±3.3a | 21.7±1.3b | 51.6±5.1c | |||
| [Cl-] (mmol l-1) | 382±11a | 413±14b | 561±17c | 619±15d | |||
| [Cl-]u/[Cl-]h | 1.08±0.02a | 1.11±0.02a | |||||
| Overall [Cl-]u/[Cl]h | 1.09±0.01 (N=15) | ||||||
| . | Drinking freshwater (N=8) . | . | Drinking saline (N=7) . | . | |||
|---|---|---|---|---|---|---|---|
| . | Haemolymph . | Urine . | Haemolymph . | Urine . | |||
| Osmolality (mosmol kg-1) | 799±29a | 794±29a | 1158±28b | 1147±23b | |||
| [Na+] (mmol l-1) | 374±12a | 387±15a | 542±12b | 526±8b | |||
| [K+] (mmol l-1) | 7.5±0.4a,b | 7.1±0.5a | 9.6±0.5b | 8.7±0.7a,b | |||
| [Ca2+] (mmol l-1) | 15.4±0.7a | 9.4±1.5b | 22.0±0.7c | 13.0±0.7a,b | |||
| [Mg2+] (mmol l-1) | 9.9±1.2a | 12.0±3.3a | 21.7±1.3b | 51.6±5.1c | |||
| [Cl-] (mmol l-1) | 382±11a | 413±14b | 561±17c | 619±15d | |||
| [Cl-]u/[Cl-]h | 1.08±0.02a | 1.11±0.02a | |||||
| Overall [Cl-]u/[Cl]h | 1.09±0.01 (N=15) | ||||||
Values are means ± S.E.M.
Haemolymph and urine values are paired within the freshwater (N=8)and the seawater (N=7) groups.
Means that bear the same superscript are not significantly different(repeated-measures ANOVA, Tukey's HSD test, P<0.05).