Population Viability Analysis of a Long-Lived Freshwater Turtle, Hydromedusa maximiliani (Testudines: Chelidae)

2012 ◽  
Vol 11 (2) ◽  
pp. 162-169 ◽  
Author(s):  
Shirley Famelli ◽  
Sarah Cristina Piacentini Pinheiro ◽  
Franco Leandro Souza ◽  
Rafael Morais Chiaravalloti ◽  
Jaime Bertoluci
Keyword(s):  
Population Viability Analysis ◽  
Population Viability ◽  
Freshwater Turtle ◽  
Viability Analysis

scholarly journals Distribution range and population viability of Emys orbicularis in Slovakia: a review with conservation implications

2021 ◽  
Vol 44 ◽  
pp. 141-161
Author(s):  
Enikő Horváth ◽  
Martina Martvoňová ◽  
Stanislav Danko ◽  
Peter Havaš ◽  
Peter Kaňuch ◽  
...  
Keyword(s):  
Activity Patterns ◽  
Population Viability Analysis ◽  
Population Viability ◽  
Freshwater Turtle ◽  
Isolated Populations ◽  
Term Survival ◽  
Emys Orbicularis ◽  
Turtle Species ◽  
Viability Analysis ◽  
Probability Of Extinction

The European pond turtle (Emys orbicularis) is the only native freshwater turtle species in Slovakia. Due to watercourse regulations in the middle of the 20th century, its range became fragmented and, currently, there are only two isolated populations. From a total of 1,236 historical records in Slovakia, most observations (782 records) came from the area of the Tajba National Nature Reserve (NNR). Three of the population viability analysis models (‘baseline’, ‘catastrophe’, ‘nest protection during a catastrophe’) indicated the extinction of the population in Tajba, with the highest probability of extinction occurring during a catastrophic event (probability of extinction 1.00). We also evaluated information about the activity patterns of seven radio-tracked individuals and about the number of destroyed nests from the area. During the period 2017–2021, we recorded only two turtles leaving the aquatic habitat of Tajba. An alarming fact is the massive number of destroyed nests found in the area during the study period (Tajba 524; Poľany 56). Our results indicate that the population in the Tajba NNR require immediate application of management steps to ensure its long-term survival.

scholarly journals Can we reestablish a self-sustaining population? A case study on reintroduced Crested Ibis with population viability analysis

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yashuai Zhang ◽  
Fang Wang ◽  
Zhenxia Cui ◽  
Min Li ◽  
Xia Li ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Population Size ◽  
Carrying Capacity ◽  
Wild Population ◽  
Population Viability Analysis ◽  
Population Viability ◽  
Viability Analysis ◽  
Crested Ibis ◽  
Reintroduced Population

Abstract Background One of the most challenging tasks in wildlife conservation and management is clarifying which and how external and intrinsic factors influence wildlife demography and long-term viability. The wild population of the Crested Ibis (Nipponia nippon) has recovered to approximately 4400, and several reintroduction programs have been carried out in China, Japan and Korea. Population viability analysis on this endangered species has been limited to the wild population, showing that the long-term population growth is restricted by the carrying capacity and inbreeding. However, gaps in knowledge of the viability of the reintroduced population and its drivers in the release environment impede the identification of the most effective population-level priorities for aiding in species recovery. Methods The field monitoring data were collected from a reintroduced Crested Ibis population in Ningshan, China from 2007 to 2018. An individual-based VORTEX model (Version 10.3.5.0) was used to predict the future viability of the reintroduced population by incorporating adaptive patterns of ibis movement in relation to catastrophe frequency, mortality and sex ratio. Results The reintroduced population in Ningshan County is unlikely to go extinct in the next 50 years. The population size was estimated to be 367, and the population genetic diversity was estimated to be 0.97. Sensitivity analysis showed that population size and extinction probability were dependent on the carrying capacity and sex ratio. The carrying capacity is the main factor accounting for the population size and genetic diversity, while the sex ratio is the primary factor responsible for the population growth trend. Conclusions A viable population of the Crested Ibis can be established according to population viability analysis. Based on our results, conservation management should prioritize a balanced sex ratio, high-quality habitat and low mortality.

Unsustainable harvest of dugongs in Torres Strait and Cape York (Australia) waters: two case studies using population viability analysis

2004 ◽  
Vol 7 (4) ◽  
pp. 417-425 ◽  
Author(s):  
Robert Heinsohn ◽  
Robert C. Lacy ◽  
David B. Lindenmayer ◽  
Helene Marsh ◽  
Donna Kwan ◽  
...  
Keyword(s):  
Case Studies ◽  
Population Viability Analysis ◽  
Population Viability ◽  
Viability Analysis ◽  
Cape York ◽  
Torres Strait

Comment on sea lion population viability analysis

Polar Biology ◽  
2012 ◽  
Vol 35 (10) ◽  
pp. 1617-1618 ◽  
Author(s):  
Paul A. Breen ◽  
David J. Gilbert ◽  
Paul J. Starr
Keyword(s):  
Population Viability Analysis ◽  
Population Viability ◽  
Sea Lion ◽  
Viability Analysis
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