Table 2. Regression slopes of assessed traits.

	D. buzzatii				D. koepferae
Increasing fraction	Viability	Developmental time	Wing Size	Performance	Viability	Developmental time	Wing Size	Performance
Alkaloids	−0.59*	0.63*	−0.08	−0.47*	−0.04	0.11	−0.54*	−0.07
Non-alkaloids	0.18	0.39	−0.04	0.18	−0.03	0.08	−0.003	−0.2

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<0.05).