Slow rate of molecular evolution in high-elevation hummingbirds

被引:52
作者
Bleiweiss, R
机构
[1] Univ Wisconsin, Dept Zool, Madison, WI 53706 USA
[2] Univ Wisconsin, Zool Museum, Madison, WI 53706 USA
关键词
Andes; DNA hybridization; molecular clock; oxygen metabolism;
D O I
10.1073/pnas.95.2.612
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Estimates of relative rates of molecular evolution from a DNA-hybridization phylogeny for 26 hummingbird species provide evidence for a negative association between elevation and rate of single-copy genome evolution, This effect of elevation on rate remains significant even after taking into account a significant negative association between body mass and molecular rate. Population-level processes do not appear to account for these patterns because (i) all hummingbirds breed within their first year and (ii) the more extensive subdivision and speciation of bird populations living at high elevations predicts a positive association between elevation and rate, The negative association between body mass and molecular rate in other organisms has been attributed to higher mutation rates in forms with higher oxidative metabolism. As ambient oxygen tensions and temperature decrease with elevation, the slow rate of molecular evolution in high-elevation hummingbirds also may have a metabolic basis, A slower rate of single-copy DNA change at higher elevations suggests that the dynamics of molecular evolution cannot be separated from the environmental context.
引用
收藏
页码:612 / 616
页数:5
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