Brakefield P M, Liebert T G
Institute of Ecological and Evolutionary Sciences, Leiden University, The Netherlands.
Proc Biol Sci. 2000 Oct 7;267(1456):1953-7. doi: 10.1098/rspb.2000.1235.
Populations of Biston betularia in the region of The Netherlands around Leiden and Rotterdam were resampled. A comparison of three sets of data for 1969-1973, 1988 and 1999 enabled a further examination of declines in melanism. Unlike parallel changes for the black carbonaria form of this species in urban regions of Britain, those inThe Netherlands involve substantial changes in frequencies of at least two of the intermediate insularia morphs as well as an increase in the non-melanic typica morph. The darkest of the three insularia morphs has shown a transitory pulse of increased frequency in The Netherlands. The dynamics are discussed in relation to the history of air pollution and to straightforward predictions about selection.
对荷兰莱顿和鹿特丹周边地区的桦尺蛾种群进行了重新采样。通过比较1969 - 1973年、1988年和1999年的三组数据，能够进一步研究黑化现象的减少情况。与该物种在英国城市地区黑色型桦尺蛾的平行变化不同，荷兰的变化涉及至少两种中间型桦尺蛾形态频率的大幅变化以及非黑化型普通形态的增加。三种中间型桦尺蛾中颜色最深的那种在荷兰出现了频率增加的短暂脉冲。结合空气污染历史和关于选择的直接预测对这些动态变化进行了讨论。
