Falling apart? Insights and lessons from three recent studies documenting rapid and severe decline in terrestrial mammal assemblages of northern, south-eastern and south-western Australia

摘要: Context Since European settlement in 1788, much of the Australian terrestrial mammal fauna has declined or become extinct. The pattern of, and reason for, that decline was little documented, is now difficult to decipher. Many species are still declining, providing (an unfortunate) opportunity better document process, identify causal factors attempt redress problem. Aim We compare trends abundance reported three recent longitudinal studies conservation reserves Australia. were not established with intention documenting decline, but marked simultaneous co-existing most striking feature their results. Methods Long-term monitoring Kakadu National Park, Northern Territory (2001–04 2007–09), Upper Warren region Western Australia (since 1974) Great Otway Victoria 1975) principally relied on trapping, also some spotlighting sand plots, changes respective assemblages. Key results Decline species, across taxonomic groups, diets size classes, mostly involved <5500g. differed protocols varied degree which potential monitored, thereby constraining interpretation drivers declines. Inappropriate fire regimes predation by feral cats likely contributing at least two study areas, periods markedly below-average rainfall implicated areas. Conclusions conclude following: (1) may be failing maintain elements biodiversity they protect, substantially enhanced management required this problem; (2) current threats, assemblages highly unstable; (3) substantial increase effective long-term programs an adaptive framework needed; (4) such will more insightful if monitor driving population change. Implications Native declines community disassembly occurring elsewhere. critical for assessing done well, it can guide efficient deliver outcomes.