measurement_data

The file, measurement_data.csv, includes the measured values of the all individuals we used in our quantitative genetic analyses. The first column heading, "Population", indicates used populations in the quantitative genetics. “P1” is D. b. capito; “P2” is D. b. fortunei; “F1” is hybrids produced by crossing D. b. capito and D. b. fortunei; “B1” is backcross population to D. b. capito and “B2” is a backcross population to D. b. fortunei. The second column heading, “HW”, indicate head width. The third, “HL”, indicate head length. The forth, “TW”, indicate thorax width. The fifth, “TL”, indicate thorax length. The sixth, “EW”, indicate elytron width. The seventh, “EL”, indicate elytron length. These measurement values have the unit of millimeter. The last column heading, “Randomly chosen 48 individuals”, indicate the individuals used to determine the eigenvector for the principle component analysis. To remove bias caused by differences in sample size between parent, F1, and backcross populations and to determine PC axes meaningful for quantitative genetic analysis, we first randomly chose 48 individuals from each population (i.e., 240 individuals in total). “TRUE” indicates the chosen individuals. By using the determined eigenvector, we calculated the principle component scores of the other 268 individuals as well as randomly chosen 240 individuals.

文件`measurement_data.csv`包含了本研究定量遗传分析所用全部个体的测量数据。第一列列标题为"Population"，用于标明本研究定量遗传分析中所使用的实验种群："P1"代表D. b. capito；"P2"代表D. b. fortunei；"F1"为D. b. capito与D. b. fortunei杂交获得的杂种后代；"B1"为回交至D. b. capito的回交种群，"B2"为回交至D. b. fortunei的回交种群。第二列列标题为"HW"，代表头宽（head width）；第三列"HL"代表头长（head length）；第四列"TW"代表胸宽（thorax width）；第五列"TL"代表胸长（thorax length）；第六列"EW"代表鞘翅宽（elytron width）；第七列"EL"代表鞘翅长（elytron length），所有测量值的单位均为毫米。最后一列列标题为"Randomly chosen 48 individuals"，指代用于确定主成分分析（principle component analysis）特征向量的个体。为消除亲本种群、F1及回交种群间样本量差异带来的偏差，并确定对定量遗传分析具有意义的主成分轴，我们首先从每个种群中随机选取48个个体（总计240个个体），标记为"TRUE"的个体即为所选样本。基于确定的特征向量，我们计算了其余268个个体以及随机选取的240个个体的主成分得分。