engleski

Effect of hypoosmotic stress by low salinity acclimation of Mediterranean mussels Mytilus galloprovincialis on biological parameters used for pollution assessment

In the present study, we investigated the progressive acclimation of the mussel Mytilus galloprovincialis to different reduced seawater (SW) salinities and its effect on several biochemical markers and biotests. Mussels were purchased from a local mariculture facility during summer (SW temperature 27oC, salinity 37.5 psu) and winter (13oC, 37 psu) seasons, and transferred to the laboratory for acclimation to reduced SW salinities (37, 28, 18.5 and 11 psu). At the beginning and at the end of acclimation processes tests of mussel survival in air were provided. After 14 days of acclimation the DNA integrity, p38-MAPK activation, metallothionein induction, oxygen consumption rate, and condition index were measured. Survival in air (SOS test), as a physiological index of mussel’ s health and vitality, had significantly lower LT50 values (11 psu) in the summer, and it seems to be negatively affected by acclimation in comparison to controls (37 psu and mariculture). Condition indexes (CIs) were not significantly different, but mussel’ s acclimation resulted in decline (i.e., a negative trend), especially of CI-2 and CI-3 calculated on the basis of mussel tissue weight and shell sizes. Oxygen consumption rate (VO2) of M. galloprovincialis acclimated to reduced salinities was a concentration-dependent process and increased considerably to about 51% and 65% in lower SW concentrations (28 and 18 psu) compared to control mussels (37 psu). Lower DNA integrity, determined by Fast Micromethod® , was negatively impacted by salinity acclimation and corresponding physiological stress as well. Some differences in 1-D protein expression patterns in control groups and mussels acclimated to 28, 18.5 and 11 psu (SW) were established. Reduced SW salinities (18.5 and 11 psu) resulted in significantly higher p38-MAPK phosphorylation, whereas the SW salinity of 28 psu decreased p-p38 significantly compared to control (37 psu). The concentration of metallothioneins in mussels’ gills was reduced at 28 and 18.5 psu, while significantly higher in 11 psu. Results indicated that SW salinity variation (i.e. hypoosmotic stress) in the marine environment can affect all investigated parameters. This investigation expands our understanding of multifactorial effects of the physical marine environment on the specificity of investigated biomarkers and biotests, providing insight into the acclimation, adaptive and stress response processes of mussels. Effects of environmental factors have to be considered in sampling strategies for monitoring programmes to prevent false interpretation of results.

Mytilus galloprovincialis; biomarkers; salinity; temperature; environmental condition variations; hypoosmotic stress

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