"Breath holding" as a thermoregulation strategy in the deep-diving scalloped hammerhead shark.
深潜路氏双髻鲨以屏息方式调节体温

Authors / 作者: Royer M, Meyer C, Royer J, Maloney K, Cardona E, Blandino C, Fernandes da Silva G, Whittingham K, Holland KN.
Journal / 期刊: Science (New York, N.Y.)
Year / 年份: 2023
DOI: 10.1126/science.add4445
Publisher / 出版社: https://www.science.org/doi/10.1126/science.add4445
Abstract source / 摘要来源: https://europepmc.org/article/MED/37167384

Author abstract / 作者原文摘要
Fish moving between different thermal environments experience heat exchange via conduction through the body wall and convection from blood flow across the gills. We report a strategy of preventing convective heat loss at the gills during excursions into deep, cold water by the tropical scalloped hammerhead shark (Sphryna lewini). Adult scalloped hammerhead sharks dive rapidly and repeatedly from warm (~26°C) surface waters to depths exceeding 800 meters with temperatures as low as 5°C. Biologgers attached to adult sharks show that warm muscle temperatures were maintained throughout the deepest portion of each dive. Substantive cooling only occurred during the latter stages of the ascent phase and, once initiated, was rapid. Heat transfer coefficient modeling indicated that convective heat transfer was suspended, probably by suppressing gill function during deep dives. This previously unobserved strategy has broad similarities to marine mammal "breath hold" diving.

Summary basis / 解读依据
摘要解读依据已查看的索引作者摘要；如已保存全文，可用于进一步阅读。
Summary based on the inspected indexed author abstract; archived full text, when available, is provided for further reading.

Key findings / 主要发现
生物记录仪显示，路氏双髻鲨从温暖表层下潜至超过八百米的寒冷水域时，仍保持较高肌肉温度；快速降温发生于上升后期。传热模型提示其暂时抑制了经鳃发生的对流换热。
Biologgers recorded scalloped hammerheads maintaining warm muscle temperatures during dives from warm surface water to depths beyond 800 metres in much colder water. Rapid cooling began late in ascent, and heat-transfer modeling suggested that gill-mediated convective heat exchange had been temporarily suppressed.

Conclusions / 结论
推断的鳃功能抑制与海洋哺乳动物屏息潜水类似，可能帮助深潜觅食时保温；鳃闭合属于机制解释，并非直接观察结果。
The inferred suppression of gill function resembles breath-hold diving in marine mammals and may conserve heat during deep foraging. Gill closure is a mechanistic interpretation rather than a direct observation.

Relevance / 关联说明
直接研究清单物种，或研究广义类群中的代表物种。
Direct research on the listed species or a representative of the broadly named group.