NilssonOrtman2014_Headwidth_Data-1

Head widths (”hw”) of larvae of six species of damselflies (”spec”) reared in the laboratory at three or four temperatures ("temp"). Head widths are in the unit of millimeter. Head widths were measured at four different ages (”day”). These measurements were made immediately following hatching (day = 0),and at the age of 42, 84 and 126 days. Different species and populations were reared in three different years (”year”). Each species was sampled from populations at three different latitudes, namely near its southern range limit, at the core of its range and near the northern range limit (”lat”, coded as s, c and n, respectively). At each latitude, between two and four subpopulations were sampled (”pop”). The latitude (”lat”) and longitude (”long”) is given for each subpopulation. For a list of populations and abbreviations, please refer to Table S1 in the published paper. From each subpopulations, full-sib larvae were reared from several families (”fam”), i.e. they were hatched from eggs laid by a single female, and from each family we reared 5 individual larvae (”ind”) at each temperature.

本数据集涵盖在实验室条件下于3或4种温度（temperature, "temp"）下饲养的6种蜻蛉（damselflies）幼虫的头宽（head width, "hw"）数据，头宽单位为毫米。头宽测量于4个不同日龄（day, "day"）开展：孵化当日（日龄=0）、42日龄、84日龄及126日龄，其中孵化当日的测量于孵化后即刻完成。
不同物种（species, "spec"）及种群的饲养实验分3个不同年份（year, "year"）开展。每个物种均从3个不同纬度的种群中采样，分别对应其分布范围的南界附近、分布区核心及北界附近（latitude, "lat"，分别编码为s、c、n）。
每个纬度下会采样2至4个亚种群（population, "pop"），每个亚种群均记录了其纬度（lat）与经度（longitude, "long"）。种群列表及其缩写详情请参见已发表论文中的表S1。
从每个亚种群的多个家系（family, "fam"）中饲养全同胞幼虫——这些幼虫均由单头雌性成虫所产的卵孵化而来；每个家系在每个温度下均饲养5头幼虫（individual, "ind"）。