Evidence for a robust sex-specific trade-off between cold resistance and starvation resistance in Drosophila melanogaster
Evidence for a robust sex-specific trade-off between cold resistance and starvation resistance in Drosophila melanogaster
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DOI：
10.1111/j.1420-9101.2004.00871.x
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发表时间：
2005-07-01
影响因子：
2.1
通讯作者：
Telonis-Scott, M
中科院分区：
文献类型：
--
作者：
Hoffmann, AA;Hallas, R;Telonis-Scott, M
在昆虫中，脂质代谢的变化可能是耐寒和抗饥饿之间权衡的基础。为了验证这一点，我们研究了独立的黑腹果蝇品系的相关反应，这些品系被选择为增强抗寒性和增强抗饥饿性。饥饿系表现出与其他黑腹d.p elogaster种群相关的模式，包括更高的脂质水平和更强的抗干燥能力，尽管选择的系没有表现出其他研究中发现的更长的发育时间。与权衡假说一致，通过死亡率测量，抗饥饿能力增强的选系对冷胁迫的抵抗力下降，而抗寒冷能力增强的选系对饥饿的抵抗力下降。为了消除造成这些模式的无意选择的可能性，来自两种选择制度的选种和对照系进行杂交，形成大量繁殖种群，这些种群在建立同雌系之前被留下四代。通过对来自两种选择制度的这些品系的耐饥性和抗寒性进行评分，我们证实了雌性对这些胁迫的抗性之间存在负相关，而雄性则没有。讨论了在食物资源有限的寒冷条件下，这种权衡对生存的潜在影响。
In insects changes in lipid metabolism may underlie a trade-off between cold resistance and starvation resistance. To test this we examined correlated responses in independent sets of Drosophila melanogaster lines selected for increased cold resistance and increased starvation resistance. The starvation lines showed correlated patterns found in other D. melanogaster populations selected for this trait, including higher lipid levels and increased resistance to desiccation, although the selected lines did not show a longer development time as found in some other studies. Consistent with the trade-off hypothesis, selected lines with increased starvation resistance showed decreased resistance to a cold stress as measured by mortality, whereas selected lines with increased cold resistance showed a decrease in starvation resistance. To counter the possibility of inadvertent selection accounting for these patterns, selected and control lines from both selection regimes were crossed to form mass bred populations, which were left for four generations prior to establishing isofemale lines. By scoring starvation and cold resistance in these lines derived from both sets of selection regimes, we confirmed the negative association between resistance to these stresses in females but not in males. Potential implications of this trade-off for surviving cold conditions when food resources are limiting are discussed.