scholarly journals Reserve size, dispersal and population viability of wide ranging carnivores: the case of jaguars in Emas National Park, Brazil

2020 ◽  
Author(s):  
S. P. Finnegan ◽  
L. Galvez‐Bravo ◽  
L. Silveira ◽  
N. M. Tôrres ◽  
A. T. A Jácomo ◽  
...  
Keyword(s):  
National Park ◽  
Population Viability ◽  
Reserve Size

Preliminary predictions of the impacts of habitat area and catastrophes on the viability of Mahogany Glider Petaurus gracilis populations

1999 ◽  
Vol 5 (1) ◽  
pp. 56 ◽  
Author(s):  
Stephen M. Jackson
Keyword(s):  
Population Size ◽  
Population Viability Analysis ◽  
Adult Mortality ◽  
Population Viability ◽  
Key Populations ◽  
Management Options ◽  
Viability Analysis ◽  
Reserve Size ◽  
The Impact ◽  
Negative Population

The population viability analysis (PVA) program VORTEX was used to examine the viability of different sized populations of the Mahogany Glider Petaurus gracilis, and to examine the impact of a one in a hundred year catastrophe (each requiring a different reserve size) of different severities on different sized populations. The PVA showed that populations up to 300 individuals (1 500 ha) have a negative population growth rate, high losses of genetic diversity and a greater than 5% chance of extinction within 100 years. Populations of 400?700 individuals (2 000?3 500 ha) showed a decreasing trend in population size suggesting they are likely to become extinct after 100 years. A population of 800 individuals (4 000 ha) was needed for the population size to stabilize. Sensitivity analysis showed adult mortality of greater than 25% to be important in decreasing the viability of populations. Populations of 400 were resistant to a one in 100 year catastrophe which had a 20% mortality and 20% decrease in reproduction. When the mortality was 70%, with 70% decrease in reproduction, a population of 1 000 still had a 12% chance of extinction. As only approximately 50% of the available habitat appears to be occupied, an area up to 8 000 ha (800 individuals) is suggested to be required to maintain viable populations of Mahogany Gliders. A number of management options are recommended including the retention of habitat, establishing corridors between key populations, and using fire to minimize rainforest expansion.

Population Viability of Arctic Grayling in the Gibbon River, Yellowstone National Park

2010 ◽  
Vol 30 (6) ◽  
pp. 1582-1590 ◽  
Author(s):  
Amber C. Steed ◽  
Alexander V. Zale ◽  
Todd M. Koel ◽  
Steven T. Kalinowski
Keyword(s):  
Yellowstone National Park ◽  
National Park ◽  
Population Viability ◽  
Arctic Grayling

scholarly journals Assessing the Relative Impacts of Roadkill and Nest Poaching on the Population Viability of the Blue-and-Yellow Macaw, Ara ararauna (Aves: Psittaciformes), in a Brazilian National Park

Diversity ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 652
Author(s):  
Carine Firmino Carvalho-Roel ◽  
Oswaldo Marçal Júnior
Keyword(s):  
At Risk ◽  
National Park ◽  
Population Viability ◽  
Adult Survival ◽  
Illegal Trade ◽  
Mobile Species ◽  
Adult Females ◽  
Highly Sensitive ◽  
Viable Population ◽  
First Time

The blue-and-yellow macaw (Ara ararauna) is suffering from higher roadkill rates (RK) at the Emas National Park (ENP), an important Brazilian National Park in the Cerrado biome. This species is also a victim of nest poaching for illegal trade. We modeled the blue-and-yellow macaw population’s viability in ENP and how this viability is affected by roadkill and nest poaching. We hereby report that the species is critically at risk and could be extinct in about a decade when considering both threats. Without considering any threat, 150 individuals are necessary to maintain a viable population. When individuals are harvested at a roadkill rate of 0.008 individuals/km/year and at twice this level, the viability figures increase to 4500 and 7500 birds, respectively. For nest poaching, we estimated that 2000 individuals are required to maintain a viable population. When both threats are present, 5000 individuals are necessary. The dynamics of the population are highly sensitive to the age at which females reproduce for the first time and the proportion of reproducing adult females, followed by the rate of adult survival. Our model demonstrates how even a non-threatened highly mobile species, such as the blue-and-yellow macaw, may be at risk due to human activities.

scholarly journals Population Viability Analysis of the Endangered Roan Antelope in Ruma National Park, Kenya, and Implications for Management

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Johnstone K. Kimanzi
Keyword(s):  
National Park ◽  
Habitat Management ◽  
Expert Knowledge ◽  
Population Decline ◽  
Population Viability Analysis ◽  
Population Viability ◽  
Management Options ◽  
Viability Analysis ◽  
Management Interventions ◽  
Sustainable Conservation

Population viability analysis (PVA) was used to (1) establish causes of roan population decline for the past 30 years in Ruma National Park (RNP), the only park where wild roans remain in Kenya, and (2) predict the probability of roan persistence under existing and alternative management options. PVA was done using long-term data based on population dynamics, life history, climatic conditions, and expert knowledge. Poaching was identified as the main cause of roan decline in RNP. Several antipoaching and prioritized habitat management interventions to promote population recovery and sustainable conservation of roans are described. PVA predictions indicated that, without these interventions, the roan population cannot persist more than 3 decades. Furthermore, ensuring sustainable conservation of roans in RNP will boost tourism in Western Kenyan and thus alleviate poverty in this part of the country. Improved income from tourism will reduce the possible pressures from hunting and give greater incentives for local people to be actively engaged in roan conservation.

Ultrastructural Localization of Phycocyanin in the Acidophilic, Thermophilic Alga, Cyanidium Caldarium

1973 ◽  
Vol 31 ◽  
pp. 462-463
Author(s):  
M. R. Edwards ◽  
J. D. Mainwaring
Keyword(s):  
Yellowstone National Park ◽  
National Park ◽  
Ultrastructural Localization ◽  
Review Of Literature ◽  
Cyanidium Caldarium ◽  
Taxonomic Rank ◽  
Thin Sections ◽  
Standard Methods ◽  
Laboratory Cultures

Although the general ultrastructure of Cyanidium caldarium, an acidophilic, thermophilic alga of questionable taxonomic rank, has been extensively studied (see review of literature in reference 1), some peculiar ultrastructural features of the chloroplast of this alga have not been noted by other investigators.Cells were collected and prepared for thin sections at the Yellowstone National Park and were also grown in laboratory cultures (45-52°C; pH 2-5). Fixation (glutaraldehyde-osmium), dehydration (ethanol), and embedding (Epon 812) were accomplished by standard methods. Replicas of frozenfracture d- etched cells were obtained in a Balzers apparatus. In addition, cells were examined after disruption in a French Press.

Home range size, utilization and spatial organization of Pine Martens in Bial'owieza National Park, Poland

Mammal Review ◽  
2000 ◽  
Vol 30 (3-4) ◽  
pp. 232-232
Author(s):  
A. Zalewski ◽  
W. Jedrzejewski
Keyword(s):  
Home Range ◽  
National Park ◽  
Spatial Organization ◽  
Home Range Size ◽  
Range Size ◽  
Pine Martens
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