The lower and upper thermal activity thresholds of adult and larval Balaustium hernandezi von Heyden (Acari: Erythraeidae) are compared with those of its prey Tetranychus urticae Koch (Acari: Tetranychidae). Adult female B. hernandezi retain ambulatory function (CTmin) and movement of appendages (chill coma) at significantly lower temperatures (5.9 and −2.1 °C, respectively) than those of larval B. hernandezi (8.1 and −1.7 °C) and T. urticae (10.6 and 10.3 °C). There is no significant difference between the temperature at which adult and larval B. hernandezi and T. urticae cease walking as the temperature is raised (CTmax) (46.7, 46.3 and 47.3 °C, respectively). However, both life stages of B. hernandezi cease movement (heat coma) below the upper locomotory limits of T. urticae (46.8, 46.7 and 48.7 °C, respectively). Adult B. hernandezi have significantly faster walking speeds than larvae and T. urticae across a range of temperatures. The lower thermal activity threshold data indicate that B. hernandezi would make an effective biological control agent in temperate climates; however, the extent of the low temperature tolerances of the species suggests the potential to establish in a northern European climate.

中文翻译：

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捕食性螨Balaustium hernandezi的热阈值

将成虫和幼虫 Balaustium hernandezi von Heyden (Acari: Erythraeidae) 的热活动阈值上限和下限与其猎物 Tetranychus urticae Koch (Acari: Tetranychidae) 进行比较。与幼虫 B. hernandezi（8.1 和 -1.7 °C）和 T 相比，成年雌性 B. hernandezi 在显着较低的温度（分别为 5.9 和 -2.1 °C）下保持行走功能（CTmin）和附属物的运动（冷昏迷） . 荨麻疹（10.6 和 10.3 °C）。随着温度升高（CTmax），成虫和幼虫 B. hernandezi 和 T. urticae 停止行走的温度之间没有显着差异（分别为 46.7、46.3 和 47.3 °C）。然而，B. hernandezi 的两个生命阶段都会在荨麻疹的运动上限（分别为 46.8、46.7 和 48.7 °C）以下停止运动（热昏迷）。成人 B。在一定温度范围内，hernandezi 的步行速度明显快于幼虫和 T.​​ urticae。较低的热活动阈值数据表明 B. hernandezi 在温带气候中是一种有效的生物防治剂；然而，该物种对低温的耐受程度表明有可能在北欧气候中建立。