Accelerating population decline of Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis)

摘要: The Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis) is now the only cetacean species in River following probable extinction of baiji (Lipotes vexillifer). However, population abundance estimates and genetic diversity studies both indicate that declining may also become extinct wild near future. We used data from 279 stranded porpoises were collected along middle lower reaches since 1978 to construct life tables for before after 1993. Demographic rate reveal an accelerating decline according instantaneous increase ((r) over bar), (r) bar = -0.0159 (SD 0.0135) -0.0625 0.0169). Using individual-based Leslie matrix model, there a high probability (86.06%) within next 100 years. Effective conservation measures must be enacted immediately. pattern provides startling demonstration how rapid economic development without adequate environmental control leads deterioration natural habitats threatens native extremely rapid. This research emphasizes need precautionary action other riverine systems containing freshwater species. (C) 2012 Elsevier Ltd. All rights reserved.