Could a Legal Ivory Trade Reverse Present Declines in Elephant Populations in Africa? Predictions from an Engineer's Population Simulation Model

2016 ◽  
Author(s):  
Rowan B Martin
Keyword(s):  
Simulation Model ◽  
Ivory Trade ◽  
Population Simulation

scholarly journals Population Simulation Model ofSitophilus zeamais(Coleoptera: Curculionidae) in Grain Stores in West Africa

1999 ◽  
Vol 28 (5) ◽  
pp. 836-844 ◽  
Author(s):  
William G. Meikle ◽  
Niels Holst ◽  
Richard H. Markham
Keyword(s):  
West Africa ◽  
Simulation Model ◽  
Grain Stores ◽  
Population Simulation

scholarly journals Comparing the Lifestyle Interventions for Prediabetes: An Integrated Microsimulation and Population Simulation Model

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Amin Khademi ◽  
Lu Shi ◽  
Amir Ali Nasrollahzadeh ◽  
Hariharaprabhu Narayanan ◽  
Liwei Chen
Keyword(s):  
Simulation Model ◽  
Lifestyle Interventions ◽  
Population Simulation

Crocodylus johnstoni in the McKinlay Area, N.T. VIII. A Population Simulation Model

1985 ◽  
Vol 12 (3) ◽  
pp. 541 ◽  
Author(s):  
AMA Smith ◽  
GJW Webb
Keyword(s):  
Simulation Model ◽  
Population Increase ◽  
Natural Rate ◽  
River Population ◽  
Return Rates ◽  
Crocodylus Johnstoni ◽  
Research Activities ◽  
Sensitivity Tests ◽  
Estimated Error ◽  
Population Simulation

A population simulation model was constructed for the McKinlay River population of the freshwater crocodile Crocodylus johnstoni. C, johnstoni are long-lived reptiles (50 y +) which take 9-16 years to reach maturity. As a consequence, the effects of legal hunting before 1963 are still reflected in an unstable population age structure. No quantitative data on the original population densities exist, nor are there data on the densities at which equilibrium can be expected in the future. The model examines the dynamics of a population which is still expanding and does not take into account density-dependent factors which may ultimately limit the population. If the population was undisturbed for 10 years, the model predicted the mean natural rate of population increase would be 1 .5% per annum. However, the population has been disturbed during research activities, and when these disturbances and manipulations were simulated the model predicted a 4% decrease in the population between 1979 and 1983. Independent surveys in both 1979 and 1983 indicated a 5% decrease in the population. This consistency has been interpreted as indicating that the model's predictions are not grossly erroneous. Sensitivity tests were carried out in which most parameters in the model were independently varied by plus or minus their estimated error, while other parameters were held constant. The resultant changes in the estimated population size after 10 years indicated the model was most sensitive to the age-specific mortality estimates. C. johnstoni management has the conservation requirement of maintaining or even enhancing the density of wild populations. Sustained-yield harvesting can theoretically be achieved without compromising this requirement by harvesting eggs and/or hatchlings, and later returning a proportion of the harvest to the population when they are larger and have a greater probability of surviving. When released into the wild, captive-raised C. johnstoni survive as well as wild ones of equivalent sizes. The model was used to simulate egg and hatchling harvests with different collection and return rates, and different ages of returned animals. It was also used to simulate harvests of post-hatchling crocodiles, without a return of captiveraised animals.

scholarly journals A theoretical model for the prevention of Banana Moko (Musa AAB Simmonds)

F1000Research ◽  
2020 ◽  
Vol 9 ◽  
pp. 1443
Author(s):  
Marly Grajales Amorocho ◽  
Anibal Muñoz Loaiza
Keyword(s):  
Theoretical Model ◽  
Differential Equations ◽  
Simulation Model ◽  
Ordinary Differential Equations ◽  
Logistic Growth ◽  
Maximum Capacity ◽  
Linear Ordinary Differential Equations ◽  
Variable Population ◽  
Population Simulation ◽  
Over Time

A population simulation model with non-linear ordinary differential equations is presented, which interprets the dynamics of the banana Moko, with prevention of the disease and population of susceptible and infected plants over time. A crop with a variable population of plants and a logistic growth of replanting is assumed, taking into account the maximum capacity of plants in the delimited study area.

Novel simulation model for many-body multipole dispersion interactions

1998 ◽  
Vol 94 (3) ◽  
pp. 417-433 ◽  
Author(s):  
MARTIN VAN DER HOEF ◽  
PAUL MADDEN
Keyword(s):  
Simulation Model ◽  
Dispersion Interactions ◽  
Many Body
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