Time series analyses and Leslie matrix models for the growth rate of habituated groups.

The base case used the actual data for survivorship and fertility throughout the study, without making any adjustments for any types of deaths or veterinary interventions. The additional cases excluded deaths from poaching or respiratory disease, and added deaths when gorillas received veterinary interventions. The rate per gorilla-year equals the number of those deaths or interventions (N), divided by the 5652 gorilla-years observed during this study. The standard errors (SE) for those rates are calculated among the calendar years observed. Numbers in brackets indicate Leslie matrix predictions of the growth rate if 50% of the gorillas treated would have died in the absence of veterinary treatment. See the Methods for estimates of other potential sources of uncertainty in the growth rates.

本研究的基准情景采用全周期内关于存活率与繁殖率的实测数据，未对任何类型的死亡或兽医干预措施进行调整。附加情景则剔除了偷猎或呼吸道疾病导致的死亡案例，并计入大猩猩接受兽医干预时发生的死亡事件。每大猩猩-年（gorilla-year）的发生率等于此类死亡或干预事件的数量（N）除以本研究观测到的5652个大猩猩-年时长。上述发生率的标准误（Standard Error，SE）基于观测覆盖的自然年份计算得出。方括号内的数值为莱斯利矩阵（Leslie Matrix）预测的种群增长率，其假设条件为：若未实施兽医干预，接受治疗的大猩猩中将有50%死亡。有关种群增长率不确定性的其他潜在来源的估算细节，请参见研究方法部分。