Opposing clines for high and low temperature resistance in Drosophila melanogaster
Opposing clines for high and low temperature resistance in Drosophila melanogaster
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DOI：
10.1046/j.1461-0248.2002.00367.x
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发表时间：
2002-09-01
期刊：
影响因子：
8.8
通讯作者：
Hallas, R
中科院分区：
文献类型：
--
作者：
Hoffmann, AA;Anderson, A;Hallas, R
在昆虫中，物种比较表明温度上限和纬度之间的关联较弱，而温度下限之间的关联较强。为了比较物种内的热反应的纬度模式，我们认为在果蝇的耐热性和耐寒性的纬度变化。我们发现，从澳大利亚东部沿海的17-24个种群的比较，这些极端温度的阻力相反的倾斜。击倒时间热休克增加对热带，而恢复时间冷休克减少对温带纬度。冷休克后的死亡率也呈现出一种临床模式。与纬度的斜相关性是线性的，并与最冷月份的最低温度（抗寒性）和最暖月份的最高温度（耐热性）有关。这表明，在物种内，高温和低温反应都可以随纬度变化，作为选择的直接或间接影响的结果。
In insects, species comparisons suggest a weak association between upper thermal limits and latitude in contrast to a stronger association for lower limits. To compare this to latitudinal patterns of thermal responses within species, we considered latitudinal variation in heat and cold resistance in Drosophila melanogaster . We found opposing clines in resistance to these temperature extremes in comparisons of 17-24 populations from coastal eastern Australia. Knockdown time following heat shock increased towards the tropics, whereas recovery time following cold shock decreased towards temperate latitudes. Mortality following cold shock also showed a clinal pattern. Clinal associations with latitude were linear and related to minimum temperatures in the coldest month (for cold resistance) and maximum temperatures in the warmest month (for heat resistance). This suggests that within species both high and low temperature responses can vary with latitude as a consequence of direct or indirect effects of selection.