Abstract
Abstract Due to the lower salinity, Baltic Mytilus edulis are dwarfed compared to North Sea mussels. The relative sensitivity to pollution of the two populations has been much debated. We have compared the stress response of Mytilus edulis from the Baltic and North Seas to addition of diesel oil in combination with salinity changes. Respiration and NH4-N excretion were found to change synergistically with lowered salinity in Baltic mussels but not in North Sea mussels. Stress effects were generally aggravated by simultaneous lowering of salinity and counteracted by salinity increases. A more pronounced lowering of O/N-ratios of Baltic mussels at ambient salinities indicates that these are more sensitive to additional stress of oil pollution that is superimposed on the already existing salinity stress.
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