all analyses

Data collected in the field. Subject is the unique identifier of each black-and-white warbler that was sampled during the study. The study was conducted over 4 years (y1=2008, y2=2009, y3=2010, y4=2011). Breeding (N=boreal forest, S=southeast) is based on stable hydrogen isotope values. Timing (E=Early, M=middle, L=Late) is based on the range of capture dates for each sex in a given breeding destination and in a given year. rbc represents the stable carbon isotope value based on red blood cells collected from brachial vein puncture. Cond is a size-specific condition index value. Age and sex of the warbler.