Regression slopes of assessed traits.

Slope values of regressions for each trait in both increasing fraction treatments (Alkaloids and Non- alkaloids concentrations) for both D. buzzatii and D. koepferae. Asterisks denote significant regressions (p布氏果蝇（D. buzzatii）与克氏果蝇（D. koepferae）在生物碱（Alkaloids）浓度及非生物碱（Non-alkaloids）浓度两类递增分数处理下，各性状的回归斜率值。星号代表回归结果显著（p