First egg dates for great tits (Parus major) and blue tits (Cyanistes caeruleus) breeding in three deciduous woods in Cambridgeshire, England in 1993 to 2014

[THIS DATASET HAS BEEN WITHDRAWN]. This dataset contains first egg dates for great tits (Parus major) and blue tits (Cyanistes caeruleus) from Monks Wood, Brampton Wood and Wennington Wood in Cambridgeshire, England, over a 22 year period. The dataset runs from the breeding season in 1993 to the end of the breeding season in 2014. The first egg dates are presented as the number of days from the start date which was set as the 1st April each year. Because the timing of breeding of great tits and blue tits is influenced in large part by ambient temperature and the phenology of their main prey, the data were collected as a measure of spring phenology. These data comprise part of a larger long-term study of the influence of habitat (extent, structure and composition) and landscape factors on abundance, distribution and breeding success of woodland birds in English lowland deciduous woodland. Full details about this dataset can be found at https://doi.org/10.5285/2024e114-6a7e-437d-b3a6-4929967eb1aa

本数据集已撤回。该数据集收录了英国剑桥郡Monks Wood、Brampton Wood和Wennington Wood地区大拟啄木鸟（Parus major）和蓝山雀（Cyanistes caeruleus）的首次产蛋日期，时间跨度为22年。数据集的时间范围从1993年的繁殖季节至2014年繁殖季节结束。首次产蛋日期以自每年4月1日设定的起始日期起算的天数表示。由于大拟啄木鸟和蓝山雀的繁殖时机在很大程度上受环境温度及其主要猎物物候期的影响，因此收集这些数据作为春季物候期的衡量指标。这些数据是关于英格兰低地落叶林中鸟类种群密度、分布和繁殖成功率受栖息地（范围、结构和组成）及景观因素影响的长达数年的长期研究的一部分。关于本数据集的详细信息可在以下链接查阅：https://doi.org/10.5285/2024e114-6a7e-437d-b3a6-4929967eb1aa