Journey North - Red-winged blackbird observations by volunteer community scientists across Central and North America (1999-2020)

This data package contains Red-winged Blackbird migration data consisting of 9,352 total observational reports from 1999 - 2020 across North and Central America. These data were collected by 4,647 community scientists for Journey North, a crowdsourced participatory science program of the University of Wisconsin-Madison Arboretum. The Journey North Red-winged Blackbird Project is an ongoing study of Red-winged Blackbird phenology conducted at broad spatial and temporal scales. Since 1999, community scientists have tracked first arrival dates and breeding and feeding behavior as well as the onset of fall migration and presence of Red-winged blackbird species throughout the winter months in the United States. The focal species is the Red-winged Blackbird (Agelaius phoeniceus). Observers also provide estimates of the number of birds sighted. However, observers do not follow standardized methods for counting species observed. Observers do not observe at set times of the day, do not repeat observations regularly, and are not required to provide the length of time during which a specified number of species observed were counted. Therefore, it is recommended that this dataset be analyzed to indicate presence not abundance. Researchers are encouraged to read the rich information provided by volunteers in their comments. These comments provide qualitative information about observational reports. Researchers are also encouraged to refer to submitted photographs that also provide context for observational reports. The Journey North Red-winged Blackbird Project dataset is hosted by the University of Wisconsin-Madison Shared Web Hosting Service.本数据集套件包含红翅黑鹂（Red-winged Blackbird）的迁徙相关数据，涵盖1999年至2020年间北美与中美洲地区的共计9352份观测报告。这些数据由4647位公民科学家为Journey North项目收集，该项目是威斯康星大学麦迪逊分校植物园（University of Wisconsin-Madison Arboretum）发起的众包参与式科学计划。Journey North红翅黑鹂项目是一项在广阔时空尺度上开展的红翅黑鹂物候学长期研究。自1999年起，公民科学家持续追踪记录红翅黑鹂的首次抵达日期、繁殖与取食行为、秋季迁徙起始时间，以及该物种在美国冬季的存续状况。本研究的目标物种为红翅黑鹂（Agelaius phoeniceus）。观测者还会提供目击个体数量的估算值，但未遵循统一的物种计数标准方法：既未固定观测时段，也未定期重复开展观测，且无需提供统计指定观测物种数量的持续时长。因此，建议本数据集仅用于分析物种存在情况，而非种群丰度。鼓励研究者参考志愿者在观测备注中提供的丰富定性信息，同时建议研究者查阅随观测报告一同提交的相关照片，这些照片可为观测内容提供必要的背景补充。Journey North红翅黑鹂项目数据集由威斯康星大学麦迪逊分校共享网络托管服务（University of Wisconsin-Madison Shared Web Hosting Service）托管。