Distribution and Derivation Data

This zip file contains the raw data (reported direct recoveries, estimated recoveries, and estimated harvest) for each population for both adults and young. Within each spreadsheet the first tab shows the actual reported direct recoveries for each state and province within each year. Reward bands were used in 2004 and 2005 and are shown in the table. The second tab shows estimated recoveries calculated by adjusting the reported direct recoveries by a reporting rate. For all populations the reporting rate used came from Zimmerman et al. 2009. In the third tab in order to calculate the estimated harvest a weighting factor (the number of birds one banded bird represents) is needed. The weighting factor is calculated as the population estimate divided by the number of banded birds in a particular year. Estimated harvest is then calculated as the estimated recoveries multiplied by the weighting factor.

本压缩包包含成体与幼体各种群的原始数据，涵盖报告直接回收量、估算回收量与估算收获量三类指标。每份电子表格的首个工作表展示了各年度内各州、各省的实际报告直接回收量；2004年与2005年采用了奖励环志（Reward bands），相关数据已在本工作表的表格中列明。第二个工作表展示了通过报告率校正报告直接回收量后计算得到的估算回收量，所有种群所使用的报告率均源自Zimmerman等人2009年的研究成果。第三个工作表中，为计算估算收获量，需引入权重因子——即单只环志鸟类（banded bird）所代表的种群个体数；该权重因子的计算方式为：对应年度的种群估计值除以该年度的环志鸟类总数量。最终，估算收获量可通过估算回收量与权重因子相乘计算得出。