浙江茶尺蠖地理种群已分化成为不同种

【目的】明确茶尺蠖Ectropis obliqua Prout不同地理种群的种群分化和生殖隔离程度。【方法】对分别在浙江杭州和衢州两地田间采集的茶尺蠖杭州种群（H）和衢州种群（Q）两个种群，进行形态学鉴定、生物学特征观察以及正反交试验。【结果】形态学与生物学观察结果表明，除Q种群的体形较大和体翅颜色略深外，两个种群的外部形态、生殖器解剖结构和雌蛾产卵量等基本相同。遗传杂交试验结果表明，无论是正交还是反交，杂交后均能获得子一代（F1）；与种群内自交相比，杂交后雌成虫的产卵量下降，卵的孵化率显著降低；幼虫的历期明显缩短且化蛹时间分布不规则，蛹重变轻；蛹的羽化率降低，羽化的成虫雌雄性比严重失调。【结论】茶尺蠖杭州种群（H）和衢州种群（Q）两个种群存在生殖隔离，有明显的种群分化，应属于不同种。

Geographic populations of the tea geometrid,Ectropis obliqua (Lepidoptera: Geometridae) in Zhejiang,eastern China have differentiated into different species

【Aim】 This study aims to evaluate the degrees of differentiation and reproduction isolation in different geographic populations of the tea geometrid, Ectropis obliqua Prout. 【Methods】 Investigations of morphological, biological properties and reciprocal cross experiments were carried out in Hangzhou population (H) and Quzhou population (Q) of E. obliqua, which were collected in the field of Hangzhou and Quzhou, Zhejiang, respectively.【Results】 Morphological and biological observation revealed that individuals of population Q had larger body shape and darker wing color than population H, whereas no observable difference in external morphology, genital structure or female fecundity was found between the two populations. Significantly fewer eggs were laid in the reciprocal cross experiments than in self-cross experiment (control). The F1 generation was always obtained with decreased egg hatching rate. The larval duration of the F1 generation was significantly shortened, the temporal distribution of pupation was irregular and pupal weight became lighter as compared with those of parents. The eclosion rate of F1 generation was reduced and the sex ratio was extremely disordered. 【Conclusion】 The results suggest that reproductive isolation and differentiation exist between population H and Q of E. obliqua, and these two geographic populations should be different species.