A southern population (S) from Xiushui County (29°1′N, 114°4′E) and a northern population (N) from Shenyang city (41°48′N, 123°23′E) of the cabbage beetle, Colaphellus bowringi vary greatly in their life-history traits, and may serve as an excellent model with which to study the inheritance of life-history traits. In the present study, we performed intraspecific hybridization using the two populations, comparing the key life-history traits (fecundity, development time, body weight, growth rate, and sexual size dimorphism (SDD)) between the two populations (S♀ × S♂ and N♀ × N♂) and their two hybrid populations (S♀ × N♂ and N♀ × S♂ populations) at 19, 22, 25, and 28°C. Our results showed that there were significant differences in life-history traits between the two parental populations, with the S population having a significantly higher fecundity, shorter larval development time, larger body weight, higher growth rate, and greater weight loss during metamorphosis than the N population at almost all temperatures. However, these life-history traits in the two hybrid populations were intermediate between those of their parents. The life-history traits in the S × N and N × S populations more closely resembled those of the maternal S population and N population, respectively, showing maternal effects. Weight loss for both sexes was highest in the S population, followed by the S × N, N × S, and N populations at all temperatures, suggesting that larger pupae lost more weight during metamorphosis. The changes in SSD with temperature were similar between the S and the S × N populations and between the N and the N × S populations, also suggesting a maternal effect. Overall, our results showed no drastic effect of hybridization on C. bowringi, being neither negative (hybrid inferiority) nor positive (heterosis). Rather, the phenotypes of hybrids were intermediate between the phenotypes of their parents.

中文翻译：

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白菜甲虫 Colaphellus bowringi（鞘翅目：Chrysomelidae）北部和南部种群之间杂交的关键生活史特征的遗传

一个来自修水县（29°1′N，114°4′E）的南方种群（S）和一个来自沉阳市（41°48′N，123°23′E）的白菜甲虫的北方种群（N），鲍林锦鲤它们的生活史特征差异很大，可以作为研究生活史特征遗传的极好模型。在本研究中，我们使用两个种群进行了种内杂交，比较了两个种群之间的关键生活史特征（繁殖力、发育时间、体重、生长速度和性大小二态性（SDD））（S♀ × S ♂ 和 N♀ × N♂）及其两个杂交种群（S♀ × N♂ 和 N♀ × S♂ 种群）在 19、22、25 和 28°C 下。我们的研究结果表明，两个亲代种群的生活史性状存在显着差异，S种群的繁殖力明显更高，幼虫发育时间更短，体重更大，生长速度更快，变态过程中体重减轻更多。几乎所有温度下的 N 种群。然而，两个杂交种群的这些生活史特征介于其父母之间。S × N 和 N × S 种群的生活史特征分别更接近于母体 S 种群和 N 种群，显示出母体效应。在所有温度下，S 种群的两性体重减轻最多，其次是 S × N、N × S 和 N 种群，这表明较大的蛹在变态过程中减重更多。SSD 随温度的变化在 S 和 S × N 种群之间以及 N 和 N × S 种群之间是相似的，也表明母体效应。总体而言，我们的结果显示杂交对 S × N 和 N × S 种群的生活史特征分别更接近于母体 S 种群和 N 种群，显示出母体效应。在所有温度下，S 种群的两性体重减轻最多，其次是 S × N、N × S 和 N 种群，这表明较大的蛹在变态过程中减重更多。SSD 随温度的变化在 S 和 S × N 种群之间以及 N 和 N × S 种群之间是相似的，也表明母体效应。总体而言，我们的结果显示杂交对 S × N 和 N × S 种群的生活史特征分别更接近于母体 S 种群和 N 种群，显示出母体效应。在所有温度下，S 种群的两性体重减轻最多，其次是 S × N、N × S 和 N 种群，这表明较大的蛹在变态过程中减重更多。SSD 随温度的变化在 S 和 S × N 种群之间以及 N 和 N × S 种群之间是相似的，也表明母体效应。总体而言，我们的结果显示杂交对 和 N 种群在所有温度下，表明较大的蛹在变态过程中失去了更多的重量。SSD 随温度的变化在 S 和 S × N 种群之间以及 N 和 N × S 种群之间是相似的，也表明母体效应。总体而言，我们的结果显示杂交对 和 N 种群在所有温度下，表明较大的蛹在变态过程中失去了更多的重量。SSD 随温度的变化在 S 和 S × N 种群之间以及 N 和 N × S 种群之间是相似的，也表明母体效应。总体而言，我们的结果显示杂交对C.鲍林吉，既不是消极的（混合劣势）也不是积极的（杂种优势）。相反，杂种的表型介于其父母的表型之间。