Changes in heart beat rates (HBR) of Brachidontes pharaonis (an invasive Lessepsian species) and Mytilaster minimus (anative Mediterranean species) in response to changes in salinity values from brackish (20) to extreme hyper-saline (75)were investigated both in situ and in the laboratory. The two species displayed different responses to varying salinity, withclear differences in HBR observed between groups investigated at different salinities and between groups originating fromdifferent environments. The native species, adapted to narrow salinity changes as those observed in the superficial waters ofthe Mediterranean Sea, showed signs of stress at salinities slightly above 37 (in the range 37–45). On the other hand, theinvasive species displayed clear signs of stress only at salinities over 45 and exhibited heart activity even under hyper-salineconditions (i.e. salinity = 75). These results indicate that the Lessepsian species has the potential to invade most of the transitionalenvironments across the entire Mediterranean basin. We therefore stress the need of including Brachidontespharaonis in all coastal monitoring programmes assessing the actual and potential spreading of alien species in the Mediterraneanregion.
|Numero di pagine||5|
|Rivista||THE ITALIAN JOURNAL OF ZOOLOGY|
|Stato di pubblicazione||Published - 2011|
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