Itasca Biological Station Bear Paw Point Breeding Bird Census, 1979-2024

This dataset is part of an ongoing effort that began in 1979 at the University of Minnesota Itasca Biological Station to conduct an annual census of breeding bird territories on Bear Paw Point every spring. Students enrolled in Field Ornithology used an established 50x50 meter grid (11.5 hectares total plot size) and walked gridlines, identifying bird songs and estimating the number of singing males heard to determine the number of breeding territories for different species present on Bear Paw Point.本数据集系明尼苏达大学伊塔斯卡生物站（University of Minnesota Itasca Biological Station）自1979年启动的长期研究项目的组成部分，该项目每年春季均会对熊爪点（Bear Paw Point）的繁殖鸟类领地开展年度普查。修读野外鸟类学（Field Ornithology）课程的学生，依托预设的50×50米网格（总样地面积11.5公顷）沿网格线开展调查，通过识别鸟鸣并估算所听到的鸣唱雄性个体数量，以此确定熊爪点上各现存鸟类物种的繁殖领地数量。