Protected areas (PAs) are fundamental to conservation efforts but they are only part of a successful conservation strategy. We examine biodiversity outside PAs in Sundaland, one of the world's most biologically degraded regions. Using the avian order Galliformes as a case study, we identify species that have not been sighted outside PAs within the last 20 years on each individual landmass (i.e., Malay Peninsula, Borneo, Sumatra, Java, and Bali). We estimate these species’ extirpation dates outside PAs using optimal linear estimation and species’ sighting records.

中文翻译：

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保护区外物种的灭绝

保护区（PA）是保护工作的基础，但它们只是成功的保护策略的一部分。我们研究了世界上生物退化最严重的地区之一的桑达兰（PA）以外的生物多样性。以鸟类鸟类鸡形目为例，我们确定了过去20年内在每个陆地上未在PA外部发现的物种（即马来半岛，婆罗洲，苏门答腊，爪哇和巴厘岛）。我们使用最佳线性估计和物种的目击记录来估计这些物种在保护区外的灭绝日期。