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Thresholds of population persistence for the Yangtze finless porpoise:implications for conservation managements 被引量:2
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作者 Zhigang MEI Mao CHEN +4 位作者 Yi HAN Yujiang HAO Jinsong ZHENG Kexiong WANG Ding WANG 《Integrative Zoology》 SCIE CSCD 2021年第4期538-547,共10页
The Yangtze finless porpoise(Neophocaena asiaeorientalis asiaeorientalis),a critically endangered species,is the only cetacean species in the Yangtze River following the functional extinction of baiji(Lipotes vexillif... The Yangtze finless porpoise(Neophocaena asiaeorientalis asiaeorientalis),a critically endangered species,is the only cetacean species in the Yangtze River following the functional extinction of baiji(Lipotes vexillifer).To inform conservation actions,two important questions need to be addressed:what is the threshold value of survival rate,and what is the threshold value of population size?We calculate the instantaneous rate of population increase(¯r)for the Yangtze finless porpoise for various combinations of the calf and the non-calf survival rates.We also test the probability of extinction for different minimum carrying capacities for 100 and 500 years using a stable population model.The threshold value of the non-calf survival rate is never lower than 0.869,but current estimates from field data have been far below this threshold.Our model based on extinction probability and carrying capacity suggests that the threshold for the population size to persist 100 years required 113 animals,and 472 animals are required to persist 500 years.Therefore,we recommend establishing an ex situ reserve network to guarantee the minimum 100-year carrying capacity.To ensure the long-term population viability,we suggest establishing two in situ reserve zones in two lakes and their surrounding reserves to meet a minimum 500-year carrying capacity.In addition,measures to avoid further habitat fragmentation should be priority. 展开更多
关键词 CONSERVATION minimum viable population population viability reserve zones STOCHASTICITY
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Population viability analysis: using a modeling tool to assess the viability of tapir populations in fragmented landscapes 被引量:1
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作者 Emília Patrícia MEDICI Arnaud Leonard Jean DESBIEZ 《Integrative Zoology》 SCIE CSCD 2012年第4期356-372,共17页
A population viability analysis(PVA)was conducted of the lowland tapir populations in the Atlantic Forest of the Pontal do Paranapanema region,Brazil,including Morro do Diabo State Park(MDSP)and surrounding forest fra... A population viability analysis(PVA)was conducted of the lowland tapir populations in the Atlantic Forest of the Pontal do Paranapanema region,Brazil,including Morro do Diabo State Park(MDSP)and surrounding forest fragments.Results from the model projected that the population of 126 tapirs in MDSP is likely to per-sist over the next 100 years;however,200 tapirs would be required to maintain a viable population.Sensitiv-ity analysis showed that sub-adult mortality and adult mortality have the strongest influence on the dynamics of lowland tapir populations.High road-kill has a major impact on the MDSP tapir population and can lead to population extinction.Metapopulation modeling showed that dispersal of tapirs from MDSP to the surrounding fragments can be detrimental to the overall metapopulation,as fragments act as sinks.Nevertheless,the model showed that under certain conditions the maintenance of the metapopulation dynamics might be determinant for the persistence of tapirs in the region,particularly in the smaller fragments.The establishment of corridors con-necting MDSP to the forest fragments models resulted in an increase in the stochastic growth rate,making ta-pirs more resilient to threats and catastrophes,but only if rates of mortality were not increased when using cor-ridors.The PVA showed that the conservation of tapirs in the Pontal region depends on:the effective protection of MDSP;maintenance and,whenever possible,enhancement of the functional connectivity of the landscape,reducing mortality during dispersal and threats in the unprotected forest fragments;and neutralization of all threats affecting tapirs in the smaller forest fragments. 展开更多
关键词 Atlantic Forest FRAGMENTATION lowland tapir minimum viable population population viability analysis
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