The Relationship between Chill-Coma Onset and Recovery at the Extremes of the Thermal Window ofDrosophila melanogaster
Critical thermal minimum (CTmin), 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 CTminand CCR in a single population of adultDrosophila m...
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Veröffentlicht in: | Physiological and biochemical zoology 2011-11, Vol.84 (6), p.553-559 |
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Sprache: | eng |
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Zusammenfassung: | Critical thermal minimum (CTmin), 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 CTminand CCR in a single population of adultDrosophila melanogasterexposed 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. CTminranged from −4.2° to 8.8°C and CCR from 12.1 to 55.1 min, and CTminand CCR varied in the same direction: populations with low CTmintended to have short CCR. Acclimation had a greater effect on CTminand CCR than short-term hardening. There was a significant positive rank correlation between CTminand 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 CTminand CCR across a range of values generated by phenotypic plasticity. This implies that the mechanisms underlying plasticity in CTminare not entirely shared with those underlying CCR. |
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ISSN: | 1522-2152 1537-5293 |
DOI: | 10.1086/662642 |