Rapid induction of the heat hardening response in an Arctic insect
Rapid induction of the heat hardening response in an Arctic insect
复制标题
快速诱导北极昆虫的热硬化反应
作者：
M. Sørensen;T. Kristensen;J. M. S. Lauritzen;N. K. Noer;T. Høye;S. Bahrndorff
通过塑料和/或进化反应来应对由于预测的气候变化而导致的不断上升和更加多变的温度的能力，将对北极物种的持久性至关重要。在这里，我们研究了格陵兰种虫Nysius groenlandicus的耐热性可塑性，它生活在温度波动很大的地区。我们用静态(热击倒时间，HKDT)和动态(临界热最大值，CTmax)两种方法测试了格陵兰的耐热性和硬化能力(塑性)。我们发现，格陵兰能够耐受短期高达50摄氏度的温度，而且在热硬化后，它可以迅速提高耐热性。此外，我们发现这种硬化反应在硬化后的几个小时内是可逆的。这些发现与温带和热带昆虫的常见观察结果形成对比，表明一些北极昆虫具有很高的热塑性，这使它们能够应对栖息地的极端温度变化。
The ability to cope with increasing and more variable temperatures, due to predicted climate changes, through plastic and/or evolutionary responses will be crucial for the persistence of Arctic species. Here, we investigate plasticity of heat tolerance of the Greenlandic seed bug Nysius groenlandicus, which inhabits areas with widely fluctuating temperatures. We test the heat tolerance and hardening capacity (plasticity) of N. groenlandicus using both static (heat knock down time, HKDT) and dynamic (critical thermal maximum, CTmax) assays. We find that N. groenlandicus is able to tolerate short-term exposure to temperatures up to almost 50°C and that it can quickly increase heat resistance following heat hardening. Furthermore, we find that this hardening response is reversible within hours after hardening. These findings contrast with common observations from temperate and tropical insects and suggest high thermal plasticity in some Arctic insects which enables them to cope with extreme temperature variability in their habitats.