Key result
White Sea bivalves Mytilus edulis and Modiolus modiolus maintained relatively high levels of cardiac activity (5.26 and 3.49 beats/min, respectively) without cardiac arrest during winter.
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Bivalves Mytilus edulis and Modiolus modiolus maintain relatively high cardiac activity without cardiac arrest during winter, exhibiting short-term rhythms connected to the tidal cycle.
A noninvasive method was applied to study the heart rates of the White Sea bivalves Mytilus edulis and Modiolus modiolus in a long-term field experiment during the winter. No cardiac arrest and relatively high levels of cardiac activity (5.26 and 3.49 beats/min, respectively) were observed in both species. Oscillations of heart rate and signal amplitude with wavelengths of 3 to 6, 9 to 16, and 18 to 24 h were found. The oscillations of heart rate and cardiac signal amplitude occurred simultaneously and were connected with the tidal cycle only in the case of the short-term rhythms.
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Bakhmet et al. (2010) studied Cardiac activity in bivalves. Winter environmental conditions was evaluated on Heart rate and cardiac signal amplitude. White Sea bivalves Mytilus edulis and Modiolus modiolus maintained relatively high levels of cardiac activity (5.26 and 3.49 beats/min, respectively) without cardiac arrest during winter.
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