Documented known and probable grizzly bear mortalities in the Greater Yellowstone Ecosystem, 2015-2023 (ver. 3.0 April 2024)

We evaluate mortalities for population segments within the DMA by deriving estimates of total mortality for independent-age (equal to or less than 2 years old) females and independent-age males, including estimates of unknown/unreported mortalities based on Cherry et al. (2002). We then determine the total annual mortality rate for these segments as a percent of their respective population estimates. For dependent-age bears (less than 2 years old), we determine the percent of human-caused mortality relative to size of the population segment but do not include estimates of unknown/unreported mortality. Mortality data in this data release represent the individual records documented by the Interagency Grizzly Bear Study Team on an annual basis. Included are all mortality records since 2015. Earlier mortality records can be obtained from annual reports from the Interagency Grizzly Bear Study Team. Literature cited: Cherry, S., M. A. Haroldson, J. Robison-Cox, and C. C. Schwartz. 2002. Estimating total human-caused mortality from reported mortality using data from radio-instrumented grizzly bears. Ursus 13:175-184.

本研究针对DMA范围内的各灰熊种群分组开展死亡状况评估：先估算独立年龄（2岁及以下）雌性与雄性灰熊的总死亡数，其中纳入基于Cherry等人（2002）的研究方法得出的未知/未报告死亡个体估算值。随后，我们以对应种群估算总量的百分比形式，计算上述种群分组的年度总死亡率。针对幼龄灰熊（2岁以下），我们仅统计人为致死占该种群分组规模的百分比，不纳入未知/未报告死亡的估算值。本数据集发布中的死亡数据，均为跨机构灰熊研究小组（Interagency Grizzly Bear Study Team）逐年记录的个体死亡档案，涵盖2015年以来的全部死亡记录；2015年之前的死亡记录可从该研究小组的年度报告中获取。参考文献：Cherry S、Haroldson M A、Robison-Cox J及Schwartz C C，2002年。《利用佩戴无线电遥测项圈的灰熊监测数据，从已报告死亡数估算总人为致死量》，《Ursus》13卷：175-184。