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1 April 2007 THE EFFECT OF HYPOXIA AND ANOXIA ON OSMOTIC AND IONIC REGULATION IN THE BRACKISH WATER ISOPOD SADURIA ENTOMON (LINNAEUS) FROM THE GULF OF GDAÑSK (SOUTHERN BALTIC)
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Abstract

The experimental material for the investigations was collected from the deep zones of the Gulf of Gdañsk. The experiments were performed at salinities of 3.0 PSU (96.87 mmol/kg), 7.3 PSU (235.73 mmol/kg), 15 practical salinity unit (PSU) (484.39 mmol/kg) and 25 PSU (807.32 mmol/kg) in conditions of hypoxia (saturation = 15% O2), anoxia (saturation <1% O2) and control conditions in aerated water (saturation = 100% O2), at a constant temperature of 10°C. Hypoxia (saturation = 15% O2) had no statistically significant effect (P > 0.05) on the osmoregulation of S. entomon in comparison with the control samples. Anoxia (saturation <1% O2) decreased the osmotic concentration of hemolymph in S.entomon. After 6 h only at salinity 3 PSU there was a statistically significant difference between the anoxic and control samples (P < 0.05). After 96 h there was a statistically significant tendency (P < 0.05) for the osmotic concentrations to decrease in anoxic conditions at all the salinities tested except 25 PSU. A tendency was observed for the Na concentrations in the hemolymph to decrease in anoxic conditions, which was statistically significant at salinity 7.3 PSU (P < 0.05) after 96 h but not statistically significant at the other salinities tested. The results show a low concentration of K in the hemolymph of S. entomon and slight fluctuations of K concentrations, but at environmental salinities the K concentration decreases under anoxic conditions but not to a statistically significant extent (P > 0.05).

ALDONA DOBRZYCKA-KRAHEL and ANNA SZANIAWSKA "THE EFFECT OF HYPOXIA AND ANOXIA ON OSMOTIC AND IONIC REGULATION IN THE BRACKISH WATER ISOPOD SADURIA ENTOMON (LINNAEUS) FROM THE GULF OF GDAÑSK (SOUTHERN BALTIC)," Journal of Shellfish Research 26(1), 147-152, (1 April 2007). https://doi.org/10.2983/0730-8000(2007)26[147:TEOHAA]2.0.CO;2
Published: 1 April 2007
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