Fig. 1.

Body mass (means ± SE) of yellow-rumped warblers (Setophaga coronata) fed experimental diets over the first 42 days. Day 1 indicates the start of the experimental diets, and on day 14, birds shift from short day to long day photoperiod. Monounsaturated fatty acids (MUFA; n = 20): black circle and dotted line, n–3 long-chain polyunsaturated fatty acids (PUFA; n = 16): dark gray square and solid line, n–6 PUFA (n = 20): light gray triangle and dotted line. Letters indicate overall significant differences between days (P < 0.05).