Table 1.

Semipartial correlation coefficients after multiple regression on CWL, lipid amounts, lipid percentages, and lipid ratios of the SC using habitat and treatment as independent variables (see Methods for details)

Response variable	Habitat R2	Treatment R2	Interaction R2
CWL-whole	0.16**	0.17**	NS
CWL	0.55**	0.05*	NS
Lipid amounts
FFA	0.49**	0.10 NS	0.12*
Ceramide	0.48**	0.01 NS	0.06*
Cerebroside	0.10*	0.01 NS	NS
Lipid percentages
Cholesterol, %	0.13*	0.19**	0.11*
FFA, %	0.41**	0.02 NS	0.06*
Ceramide, %	0.66**	0.06**	NS
Lipid ratios
FFA/ceramide	0.52**	0.12**	NS
Ceramide/cerebroside	0.54**	0.00 NS	0.03*

When the interaction term was significant, we included it in our model. We show only variables for which at least one factor was significant. NS, factor not significant. *, P < 0.05; **, P < 0.01.