Dear MarMamers We are happy to share our new article about how dive depth affects dolphins’ heart rates. We found that the deeper the dolphins dived, the slower their hearts beat. This may happen because water pressure compresses their lungs as they dive deeper, which helps slow the heart and save oxygen. We also found that breathing before a dive was linked to heart rate, showing how closely breathing and the heart work together during diving. We hope you enjoy the article and the details are below and also a link to the open access article. If you have any questions, please do not hesitate to contact the first author at: fcoliveira.050402@gmail.com Title: The heart responds to pressure via the lung: Dive depth alters cardiac control in bottlenose dolphins Authors: Cunha Oliveira, F. et al. Abstract: Marine mammals face the dual challenge of foraging underwater while relying on limited oxygen stores, making efficient oxygen management essential for survival. The dive response, which includes bradycardia and peripheral vasoconstriction, helps conserve oxygen for critical organs, such as the heart and brain. While the heart rate (HR) is known to decline with dive duration, the independent effect of dive depth, often confounded by longer dives, remains unclear. To isolate this effect, we measured HR and heart rate variability (HRV) in seven bottlenose dolphins (Tursiops truncatus) during voluntary dives to 0.5 m, 5 m and 10 m, with controlled dive durations ranging from 60, 90 and 120 s. We found that both HR and HRV decreased with increasing dive depth and duration, and that pre-dive breathing rate was positively correlated with HR before and during diving. Additionally, minimal activity to maintain depth did not influence cardiac metrics. These findings support the hypothesis that hydrostatic pressure influences cardiac function during diving, likely through its effects on lung volume. This study underscores the power of comparative physiology to reveal how air-breathing marine animals finely regulate cardiovascular function in response to environmental changes. Understanding these mechanisms is not only fundamental to evolutionary biology but also critical for predicting how diving species may be impacted by climate-driven changes in ocean temperature and hydrostatic pressure. Open access url: https://physoc.onlinelibrary.wiley.com/doi/10.1113/JP290923 e-mail: fcoliveira.050402@gmail.com