Worker Ant CTmin

CTmin = critical thermal minimum in degrees Celsius; ColonyID = identity of the colony from which the individual worker ants were tested; habitat.designation = whether the habitat is "urban" or "rural"; longitude = the decimal degrees longitude of the collection site of the colony; latitude = the decimal degrees latitude of the collection site of the colony; treatment = the temperature treatment under which the colonies were reared in the laboratory, including 21, 23, 25, 27, or 29 degrees Celsius; city = the urbanization cline from which the colonies were obtained, including "Knx" (Knoxville, TN), "Cin" (Cincinnati, OH), "Cle" (Cleveland, OH)

CTmin（critical thermal minimum，临界低温下限）：以摄氏度为单位的临界低温下限；ColonyID：供试工蚁所属蚁群的唯一标识；habitat.designation：栖息地类型命名，分为"城市（urban）"或"乡村（rural）"；longitude：蚁群采集位点的十进制度数经度；latitude：蚁群采集位点的十进制度数纬度；treatment：实验室饲养蚁群所采用的温度处理条件，涵盖21、23、25、27或29摄氏度；city：蚁群来源的城市化梯度样带，包括"Knx"（田纳西州诺克斯维尔）、"Cin"（俄亥俄州辛辛那提）、"Cle"（俄亥俄州克利夫兰）