Ransberry Victoria E, MacMillan Heath A, Sinclair Brent J
Department of Biology, University of Western Ontario, London, Ontario N6G 1L3, Canada.
Physiol Biochem Zool. 2011 Nov-Dec;84(6):553-9. doi: 10.1086/662642. Epub 2011 Oct 14.
Critical thermal minimum (CT(min)), a measure of chill-coma onset temperature, and chill-coma recovery (CCR), the time taken to recover from chill coma, are common metrics of thermal tolerance in insects. We investigated the relationship between CT(min) and CCR in a single population of adult Drosophila melanogaster exposed to a range of rearing (14°, 21.5°, and 27°C), acclimation (5 d at 6° or 29°C), and hardening (1 h at 0° or 36°C) conditions. CT(min) ranged from -4.2° to 8.8°C and CCR from 12.1 to 55.1 min, and CT(min) and CCR varied in the same direction: populations with low CT(min) tended to have short CCR. Acclimation had a greater effect on CT(min) and CCR than short-term hardening. There was a significant positive rank correlation between CT(min) and CCR, but the relationship was demonstrably curvilinear, suggesting that although plasticity in these measures is correlated through the central part of the relationship, there is no relationship between CT(min) and CCR across a range of values generated by phenotypic plasticity. This implies that the mechanisms underlying plasticity in CT(min) are not entirely shared with those underlying CCR.
临界热最小值（CT(min)）是衡量寒颤昏迷起始温度的指标，而寒颤昏迷恢复时间（CCR）是从寒颤昏迷中恢复所需的时间，它们是昆虫耐热性的常见指标。我们研究了暴露于一系列饲养条件（14°C、21.5°C和27°C）、驯化条件（在6°C或29°C下5天）和硬化条件（在0°C或36°C下1小时）下的单一成年黑腹果蝇群体中CT(min)与CCR之间的关系。CT(min)范围为-4.2°C至8.8°C，CCR范围为12.1至55.1分钟，且CT(min)和CCR的变化方向相同：CT(min)较低的群体往往CCR较短。驯化对CT(min)和CCR的影响大于短期硬化。CT(min)与CCR之间存在显著的正秩相关，但这种关系明显呈曲线状，这表明尽管这些指标的可塑性在关系的中心部分相关，但在由表型可塑性产生的一系列值范围内，CT(min)与CCR之间不存在关系。这意味着CT(min)可塑性的潜在机制与CCR的潜在机制并不完全相同。
