Sustainability and Conservation Strategies of Reintroduced Crested Ibis Population in Tongchuan,Shaanxi Based on Population Viability Analysis
Although population viability analysis(PVA)is widely used in the conservation management of endangered spe-cies,a daunting challenge of how to incorporate internal and external factors that affect the long-term maintenance of their populations still exists.After decades of conservation efforts,the wild population of the crested ibis(Nipponia nippon)has increased from seven to approximately 4,400 individuals.Several reintroduction programs have also been implemented in China,Japan and Korea,respectively.Previous study suggested that demographic stochasticity,catastrophes,and sex ra-tio were the main factors affecting the stable growth of the wild population of the crested ibis.However,assessing the long-term impacts from these variables on the reintroduced population is lacking,which adversely affects the implementation of conservation measures in the released areas.From 2014 to 2023,field data on the life history of the reintroduced crested ibis population in Tongchuan City was collected.An individual-based Vortex model(Version 10.0)was then used to predict the future viability of the population by incorporating adaptive patterns of ibis movement in relation to carrying capacity,mor-tality,dispersal,sex ratio and catastrophe frequency.Results showed that the survival probability of the reintroduced crested ibis population in Tongchuan City was 99.10%over the next 100 years.The population size was estimated to be 508,and the population genetic diversity was estimated to be 0.9304.Sensitivity analysis showed that population size and extinction probability were primarily dependent on carrying capacity,fledgling mortality and survival rate of dispersers.Therefore,subsequent conservation priorities should be the carrying capacity enhancement,increasing survival rate of dis-persers and reducing mortality.
Crested ibis(Nipponia nippon)Population viability analy-sisCarrying capacityMortalityDispersalReintroductionVortex model
NETL
NSTL
万方数据
维普
