Abstract

We sampled beetles at plots on different altitudes of the Barguzin ridge (54°30′ N 109°50′ E) in 1988–2014: the coast (500 m a.s.l.), low mountains (720 m a.s.l.), middle mountains (1004 m a.s.l.), and high mountains (1667 m a.s.l.). The selected specimens of Pterostichus montanus have been measured for six morphometric traits: the length and the width of elytra, pronotum, and head. Sample size is 968 specimens. The results have been processed in Past3 and R Software. Altitude and sex affect the beetle body size significantly: the smallest beetles dwell at the coast. At other altitudes, the beetle body size does not differ. Sexual size dimorphism (SSD) is female-biased. The highest values of SSD are in the width of elytra and head. The mean value of SSD upon all six traits was the highest at low mountains. RMA II models result in positive regression coefficients in the beetles at all studied altitudes. The body-size variation is the same in females and males. Intercepts are negative in most cases under study, and regression coefficients values are greater than one. This suggests that males were more sensitive to the environmental impact.

中文翻译：

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地面甲虫Pterostichus montanus Motsch的体型和性别大小二态性变化。（鞘翅目，鞘翅目）在海拔梯度中

摘要

我们在1988–2014年的Barguzin山脊（54°30′N 109°50′E）不同高度的地块上采样了甲虫：沿海地区（500 m asl），低山地区（720 m asl），中山地区（1004 m asl）和高山（1667 m asl）。精选的檀香紫檀标本已经对六个形态特征进行了测量：鞘翅，鞘膜和头部的长度和宽度。样本数量为968个样本。结果已在Past3和R Software中进行了处理。海拔和性别会显着影响甲虫的体型：最小的甲虫居住在海岸。在其他高度，甲虫的体型没有变化。性大小二态性（SSD）受女性偏见。SSD的最高值是在鞘翅和头部的宽度。在低山区，所有六个特征的SSD平均值最高。RMA II模型在所有研究的海拔高度下都使甲虫的回归系数为正。男性和女性的体型差异相同。在研究中的大多数情况下，截距均为负，回归系数值大于1。