Louis C, Jourdan M, Cabanac M
Am J Physiol. 1986 Jun;250(6 Pt 2):R991-5. doi: 10.1152/ajpregu.1986.250.6.R991.
Gryllus bimaculatus were infected with an intracellular prokaryote, Rickettsiella grylli, then reared either at fixed temperatures or in a temperature gradient (22-36 degrees C) where they could select the temperature they preferred. Only 50% of the infected insects reared at 28 degrees C or less survived after 20 days, against 75% of those reared at 30 degrees C or more and 90% of those in the temperature gradient. Examination of smears of insect tissue showed that all (100%) of the infected insects reared between 23 and 29 degrees C had developed a strong rickettsial infection. Only 20% of the insects reared in a gradient of temperature showed signs of strong infection. Body temperature of crickets in the temperature gradient, recorded using thin thermocouples, was 33 degrees C in infected crickets and 26.6 degrees C in controls. It is concluded that thermoregulatory behavior was used by the insects to produce a fever when infected with Rickettsiella grylli. This protected them and increased survival capacity.
将双斑蟋蟀感染一种细胞内原核生物——蟋蟀立克次氏体，然后将它们饲养在固定温度下或温度梯度环境（22 - 36摄氏度）中，在温度梯度环境下它们可以选择自己偏好的温度。在28摄氏度及以下温度饲养的受感染昆虫，20天后只有50%存活，而在30摄氏度及以上温度饲养的昆虫存活率为75%，在温度梯度环境中的昆虫存活率为90%。对昆虫组织涂片的检查表明，在23至29摄氏度之间饲养的所有（100%）受感染昆虫都发生了严重的立克次氏体感染。在温度梯度环境中饲养的昆虫只有20%表现出严重感染的迹象。使用细热电偶记录的温度梯度环境中蟋蟀的体温，受感染蟋蟀为33摄氏度，对照蟋蟀为26.6摄氏度。得出的结论是，昆虫在感染蟋蟀立克次氏体时利用体温调节行为来产生发热。这保护了它们并提高了生存能力。
