Vanishing Chromosomal Inversion Clines in Drosophila subobscura from Chile: Is Behavioral Thermoregulation to Blame?
Vanishing Chromosomal Inversion Clines in Drosophila subobscura from Chile: Is Behavioral Thermoregulation to Blame?
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DOI：
10.1086/671057
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发表时间：
2013-08-01
影响因子：
2.9
通讯作者：
Santos, Mauro
中科院分区：
文献类型：
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作者：
Castaneda, Luis E.;Balanya, Joan;Santos, Mauro
在20世纪70年代末和80年代初，亚果蝇入侵美洲后，与当地古北区种群中长期存在的染色体倒位克隆平行的染色体倒位克隆迅速进化。然而，新的克隆并没有始终如一地在旧世界的基线上汇聚。我们最近对智利小盾叶蝉种群的调查显示，倒位跃层已经褪色，甚至随着纬度的变化而改变符号。在这里，我们调查了这样一种假设，即倒位跃迁的消失可能是由于Bogert效应，即苍蝇的体温调节行为最终补偿了环境温度的变化，从而缓冲了对与温度相关的性状的选择。我们发现，在智利，雌性苍蝇在温度偏好上的纬度差异(T-p)已经进化，纬度较高的苍蝇平均T-p较低。T-p的塑料反应也减少了纬度温度变化，因为在较低温度下发育的苍蝇更喜欢较温暖的小气候。我们的结果与积极的行为温度调节可以缓冲环境变化和减少热选择对染色体排列等其他性状的潜在影响的想法是一致的。
Chromosomal inversion clines paralleling the long-standing ones in native Palearctic populations of Drosophila subobscura evolved swiftly after this species invaded the Americas in the late 1970s and early 1980s. However, the new clines did not consistently continue to converge on the Old World baseline. Our recent survey of Chilean populations of D. subobscura shows that inversion clines have faded or even changed sign with latitude. Here, we investigate the hypothesis that this fading of inversion clines might be due to the Bogert effect, namely, that flies' thermoregulatory behavior has eventually compensated for environmental variation in temperature, thus buffering selection on thermal-related traits. We show that latitudinal divergence in thermal preference (T-p) has evolved in Chile for females, with higher-latitude flies having a lower mean T-p. Plastic responses in T-p also lessen latitudinal thermal variation because flies developed at colder temperatures prefer warmer microclimates. Our results are consistent with the idea that active behavioral thermoregulation might buffer environmental variation and reduce the potential effect of thermal selection on other traits as chromosomal arrangements.