![]() ![]() These physiologic changes highlight the need for studies of mechanisms, and have translational potential for oyster aquaculture practices.Ĭardiac control is relatively conserved between phyla, despite inter- and intra-species differences for example, myogenic propagation of cardiac electrical impulses and the excitatory and inhibitory regulation of heart rate (HR) retain common design principles across evolutionarily distant organisms (Koester et al., 1979). Application of the method during an acute cooling challenge revealed that cool temperature acclimation preserved active cardiac contraction in oyster spat and increased time-domain HRV responses, whereas warm acclimation enhanced asystole. T a22 spat ( P < 0.001), whereas a lack of defined peaks in spectral density precluded frequency-domain analysis. Time-domain HRV was inversely related to temperature and elevated in T a10 vs. T a22 spat when asystole was included in analysis ( P = 0.026). The rate of HR decrease during cooling was less in T a10 vs. ![]() Spat became asystolic at low temperatures, particularly T a22 spat (T a22: 8/8 vs. HR was related to T exp in both acclimation groups. The temperature ramp (TR) protocol comprised 2☌ steps (10 min/experimental temperature, T exp) from 22☌ to 10☌ to 22☌. 22☌-T a10 or T a22, respectively each n = 8) would preserve cardiac phenotype (assessed via HR variability, HRV analysis and maintained cardiac activity) during acute temperature changes. We used the method to address the hypothesis that cool acclimation (10☌ vs. The system is housed within a temperature-controlled chamber and video microscopy imaging of the heart was coupled with video edge-detection to measure cardiac contraction, inter-beat interval, and heart rate (HR).
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