Seasonal variability of free amino acids in two marine bivalves, Macoma balthica and Mytilus spp., in relation to environmental and physiological factors
Kube, S.; Sokolowski, A.; Jansen, J.M.; Schiedek, D. (2007). Seasonal variability of free amino acids in two marine bivalves, Macoma balthica and Mytilus spp., in relation to environmental and physiological factors. Comp. Biochem. Physiol., Part A Mol. Integr. Physiol. 147(4): 1015-1027. http://dx.doi.org/10.1016/j.cbpa.2007.03.012
In: Comparative Biochemistry and Physiology. Part A. Molecular and Integrative Physiology. Elsevier: New York. ISSN 1095-6433; e-ISSN 1531-4332, more
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| Keywords |
Acids > Organic compounds > Organic acids > Amino acids
Acids > Organic compounds > Organic acids > Amino acids > Alanine
Acids > Organic compounds > Organic acids > Amino acids > Glycine
Analysis > Chemical analysis
Analysis > Mathematical analysis > Statistical analysis > Regression analysis
Chemical compounds > Alkali metal compounds > Sodium compounds > Chlorides > Sodium chloride
Chemical compounds > Organic compounds > Carbohydrates > Glycogen
Properties > Chemical properties > Salinity
Properties > Physical properties > Thermodynamic properties > Temperature
Reproduction
Seasons
Secretory organs > Glands > Endocrine glands > Animal reproductive organs > Gonads
Macoma balthica (Linnaeus, 1758) [WoRMS]; Mytilus Linnaeus, 1758 [WoRMS]
Marine/Coastal |
| Author keywords |
bivalve; osmoconformer; free amino acids; salinity; temperature;glycogen; gonadal index |
| Authors | | Top |
- Kube, S.
- Sokolowski, A., more
- Jansen, J.M.
- Schiedek, D., more
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| Abstract |
The seasonal variability of the intracellular free amino acid (FAA) concentration was studied in 5 Macoma balthica populations and 7 Mytilus spp. populations along their European distribution. Because of the well known physiological role of FAA as organic osmolytes for salinity induced cell volume regulation in marine osmoconformers, FAA variations were compared in bivalve populations that were exposed to high vs. low intraannual salinity fluctuations. In general, seasonal FAA variations were more pronounced in M. balthica than in Mytilus spp. In both bivalve taxa from different locations in the Baltic Sea, highest FAA concentrations were found in autumn and winter and low FAA concentrations were measured in summer. Seasonal patterns were less pronounced in both taxa at locations with constant salinity conditions. In contrast to Baltic Sea populations, Atlantic and Mediterranean bivalves showed high FAA concentrations in summer and low values in winter, regardless of seasonal salinity fluctuations. Significant seasonal FAA variations at locations with constant salinity conditions showed that salinity appeared not to be the main factor in determining FAA concentrations. The seasonal patterns of the main FAA pool components, i.e. alanine, glycine and taurine, are discussed in the context of seasonal variations in environmental factors (salinity, temperature) and physiological state (glycogen content, reproductive stage). |
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