Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental, Buenos Aires, Argentina.
Instituto de Biodiversidad y Biología Experimental y Aplicada. CONICET-UBA, Buenos Aires, Argentina.
J Med Entomol. 2019 Jun 27;56(4):997-1003. doi: 10.1093/jme/tjz022.
Temperature is recognized as the most influential abiotic factor on the distribution and dispersion of most insect species including Rhodnius prolixus (Stål, 1859) and Triatoma infestans (Klug, 1834), the two most important Chagas disease vectors. Although, these species thermotolerance range is well known their plasticity has never been addressed in these or any other triatomines. Herein, we investigate the effects of acclimation on thermotolerance range and resistance to stressful low temperatures by assessing thermal critical limits and 'chill-coma recovery time' (CCRT), respectively. We found positive effects of acclimation on thermotolerance range, especially on the thermal critical minimum of both species. In contrast, CCRT did not respond to acclimation in either. Our results reveal the plasticity of these Triatomines thermal tolerance in response to a wide range of acclimation temperatures. This presumably represents a physiological adaptation to daily or seasonal temperature variation with concomitant improvement in dispersion potential.
温度被认为是影响大多数昆虫物种分布和扩散的最具影响力的非生物因素，包括 Rhodnius prolixus（Stål，1859）和 Triatoma infestans（Klug，1834），这两种是最重要的恰加斯病传播媒介。尽管这些物种的耐热范围广为人知，但它们的可塑性在这些或任何其他三锥虫中从未被研究过。在此，我们通过评估热临界极限和“冷昏迷恢复时间”（CCRT），分别研究了驯化对耐热范围和对低温胁迫的抗性的影响。我们发现驯化对耐热范围有积极影响，特别是对两种物种的热临界最小值。相比之下，CCRT 在任何一种情况下都没有对驯化做出反应。我们的结果揭示了这些三锥虫对热耐受性的可塑性，以适应广泛的驯化温度。这大概代表了对日常或季节性温度变化的生理适应，同时提高了扩散潜力。
