Widely documented in animals, behavioural thermoregulation mitigates negative impacts of climate change. Plants experience especially strong thermal variability but evidence for plant behavioural thermoregulation is limited. Along a montane elevation gradient, Argentina anserina flowers warm more in alpine populations than at lower elevation. We linked floral temperature with phenotypes to identify warming mechanisms and documented petal movement and pollinator visitation using time‐lapse cameras. High elevation flowers were more cupped, focused light deeper within flowers and were more responsive to air temperature than low; cupping when cold and flattening when warm. At high elevation, a 20° increase in petal angle resulted in a 0.46°C increase in warming. Warming increased pollinator visitation, especially under cooler high elevation temperatures. A plasticity study revealed constitutive elevational differences in petal cupping and stronger temperature‐induced floral plasticity in high elevation populations. Thus, plant populations have evolved different behavioural responses to temperature driving differences in thermoregulatory capacity.

中文翻译：

---

通过花瓣运动来调节花朵的行为温度


在动物身上得到广泛记录，行为体温调节可以减轻气候变化的负面影响。植物经历特别强烈的温度变化，但植物行为温度调节的证据有限。沿着山地海拔梯度，高山种群中的阿根廷雁花比低海拔种群更温暖。我们将花朵温度与表型联系起来，以识别变暖机制，并使用延时相机记录花瓣运动和传粉者访问。高海拔的花朵比低海拔的花朵更呈杯状，将光线聚焦在花朵内部更深处，并且对气温的反应更灵敏；冷时拔罐，热时压扁。在高海拔地区，花瓣角度增加 20° 会导致气温升高 0.46°C。变暖增加了授粉媒介的访问量，特别是在较冷的高海拔温度下。一项可塑性研究揭示了高海拔群体中花瓣杯形的构成性海拔差异和更强的温度诱导的花可塑性。因此，植物种群对温度产生了不同的行为反应，从而导致了体温调节能力的差异。