TY - JOUR

T1 - In-situ long term monitoring of cardiac activity of two bivalve species from the White Sea, the blue mussel Mytilus edulis and horse mussel Modiolus modiolus

AU - Bakhmet, Igor N.

AU - Sazhin, Andrey

AU - Maximovich, Nikolay

AU - Ekimov, Dmitry

N1 - Funding Information: This work was supported by a Russian Foundation for Basic Research (projects no. 12-04-93081A and no. 16-04-00820 ?) and by federal funding for government-ordered project theme no. 0221-2014-0033. Publisher Copyright: © Marine Biological Association of the United Kingdom 2018. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Cardiac activity of two White Sea Bivalvia species - Mytilus edulis and Modiolus modiolus - was monitored in situ for one full calendar year every 4 days. During the year, we also assessed the temperature and salinity of the ambient seawater (at intervals of 1 min), measured phytoplankton concentration (every 4 days) and checked the reproductive status of the molluscs (every 2 weeks). Our field study showed a significant linear correlation between the molluscs' heart rates and the temperature of the ambient seawater. However, during specific periods of the year, we observed that phytoplankton composition or reproductive status became the dominant influence over cardiac activity. Phytoplankton concentrations were generally found to be low throughout the entire year, but two peak periods of drastically elevated phytoplankton concentration were found (April and May), and during April the peak heart rates of the blue mussels significantly increased. Spawning time took place in the middle of June, and at this time the cardiac activity of the molluscs did not change in spite of a 4°C temperature increase in the ambient seawater. Monitoring of the heart rates of the real intertidal blue mussels (animals located at the middle part of intertidal) revealed periodic fluctuations in cardiac activity that correlated strongly with tidal fluctuations. Cardiac activity in M. modiolus was significantly lower than in M. edulis from 9 May to 25 November. On the basis of our data, we concluded that the molluscs' cardiac activity can serve not only as an indicator of the animals' physiological conditions, but also as an indicator of changes in ambient factors.

AB - Cardiac activity of two White Sea Bivalvia species - Mytilus edulis and Modiolus modiolus - was monitored in situ for one full calendar year every 4 days. During the year, we also assessed the temperature and salinity of the ambient seawater (at intervals of 1 min), measured phytoplankton concentration (every 4 days) and checked the reproductive status of the molluscs (every 2 weeks). Our field study showed a significant linear correlation between the molluscs' heart rates and the temperature of the ambient seawater. However, during specific periods of the year, we observed that phytoplankton composition or reproductive status became the dominant influence over cardiac activity. Phytoplankton concentrations were generally found to be low throughout the entire year, but two peak periods of drastically elevated phytoplankton concentration were found (April and May), and during April the peak heart rates of the blue mussels significantly increased. Spawning time took place in the middle of June, and at this time the cardiac activity of the molluscs did not change in spite of a 4°C temperature increase in the ambient seawater. Monitoring of the heart rates of the real intertidal blue mussels (animals located at the middle part of intertidal) revealed periodic fluctuations in cardiac activity that correlated strongly with tidal fluctuations. Cardiac activity in M. modiolus was significantly lower than in M. edulis from 9 May to 25 November. On the basis of our data, we concluded that the molluscs' cardiac activity can serve not only as an indicator of the animals' physiological conditions, but also as an indicator of changes in ambient factors.

KW - Cardiac activity; in situ; Modiolus modiolus; monitoring; Mytilus edulis; phytoplankton; reproductive status; White Sea

KW - Cardiac activity

KW - in situ

KW - Modiolus modiolus

KW - monitoring

KW - Mytilus edulis

KW - phytoplankton

KW - reproductive status

KW - White Sea

UR - http://www.scopus.com/inward/record.url?scp=85055529147&partnerID=8YFLogxK

U2 - 10.1017/S0025315418000681

DO - 10.1017/S0025315418000681

M3 - Article

AN - SCOPUS:85055529147

VL - 99

SP - 833

EP - 840

JO - Journal of the Marine Biological Association of the United Kingdom

JF - Journal of the Marine Biological Association of the United Kingdom

SN - 0025-3154

IS - 4

ER -