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.本数据集为野外采集所得。Subject字段为本次研究中所有采样的黑白森莺（Black-and-white Warbler）的唯一识别编号。本研究周期为4年（y1=2008、y2=2009、y3=2010、y4=2011）。繁殖地信息（N代表北方针叶林，S代表东南部）基于稳定氢同位素（stable hydrogen isotope）值判定。采样时间（E代表早期，M代表中期，L代表晚期）依据特定繁殖地与特定年份内各性别个体的捕获日期区间确定。rbc字段代表通过臂静脉穿刺（brachial vein puncture）采集的红细胞（red blood cells）样本所测得的稳定碳同位素（stable carbon isotope）值。Cond字段为体型特异性身体状况指数值。数据集包含该个体的年龄与性别信息。