Geographic and seasonal patterns and limits in the adaptive response to temperature of European Mytilus spp. and Macoma balthica populationsSeasonal variability of free amino acids in two marine bivalves, Macoma balthica and Mytilus spp., in relation to environmental and physiological factorsPatterns of organic osmolytes in two marine bivalves, Macoma balthica, and Mytilus spp., along their European distribution