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Seasonal Changes in Calcium and Glucose Concentrations in Different Body Fluids of Anodonta Anatina (L.) (Bivalvia: Unionidae)

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Samples of haemolymph, extrapallial fluid and mantle cavity fluid for calcium and glucose analyses were taken in different seasons immediately after mussel collection in the field in order to see whether the calcium and glucose concentrations varied seasonally. Peak calcium concentrations in the haemolymph and extrapallial fluid (between 5 and 6 mmol/l) were found in summer when the water temperature was highest, and were lower (about 4.1-4.6 mmol/l) at other times. They only differed from each other in March, when the extrapallial fluid contained less calcium (about 3.5 mmol/l). Calcium concentration in the mantle cavity fluid was clearly higher than in the surrounding water but, during the whole year, significantly lower than in the haemolymph (about 3-4.5 mmol/l). The haemolymph glucose concentration was at its highest (about 110-125 μmol/l) in late spring and late summer, and the lowest value (50 μmol/l) was detected at midsummer between the two aforementioned peaks. During this time, mussels are releasing their gametes and rapid shell growth has begun. In the extrapallial fluid, glucose concentration was at its lowest (about 100-140 μmol/l) in summer, and from autumn to early summer it was significantly higher than in the haemolymph (140-220 μmol/l). In the mantle cavity fluid, glucose concentration was as high, or nearly as high, as in the haemolymph. The mantle cavity thus serves as a "pre-blood chamber" in the exchange of electrolytes and metabolites between the animal and the environment.

Affiliations: 1: Department of Biosciences, Division of Animal Physiology, P.O. Box 17, FIN-00014 University of Helsinki, Finland


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