.... 2. Time course of δ13C and δ15N levels in mucus, liver, white muscle and plasma of gilthead sea bream after one forced meal. (A) δ13C levels and (B) δ15N levels. Values are means±s.e.m. of five individual samples. Different letters indicate significant differences (P<0.05, ANOVA and post hoc...

....   n =9 males and n =10 females. Error bars are 1 s.e.m. The dashed horizontal line signifies the background δ 13 C value of control moths fed the standard diet without 13 C-tracers. A less-negative number indicates more tracer. One-way t -test between sexes, P <0.001. Fig. 1. δ13C in exhaled...

... began on day 0 when the isotopic composition of the diet was changed from C3 to C4. Phase 2 lasted 20 days. Phase 3 began on day 20, when the isotopic composition of the hummingbirds' diet was shifted back to the original C3. Vertical lines denote the days we measured δ13C of exhaled CO2 in fasted...