Modelling and assessment of South African elephant Loxodonta africana population persistence

The use of a quantitative population growth model to investigate the persistence of South African elephant populations is explored. The model provides quantitative assessments of population persistence and confidence intervals for estimated parameters based purely on population size estimates. The a...

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Bibliographic Details
Published in:Environmental modeling & assessment 1999-01, Vol.4 (2-3), p.155-163
Main Authors: A.S. van Jaarsveld, Nicholls, A O, Knight, M H
Format: Article
Language:English
Subjects:
Animal populations
Arachnids
Census of Population
Elephants
Endangered & extinct species
Estimates
Extinction
Growth models
Ivory
Medical prognosis
Metapopulations
National parks
Parks & recreation areas
Poaching
Population growth
Population number
Wildlife management
Zoology
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Summary:The use of a quantitative population growth model to investigate the persistence of South African elephant populations is explored. The model provides quantitative assessments of population persistence and confidence intervals for estimated parameters based purely on population size estimates. The analysis supports the view that most of the larger populations in the region are secure. This view is further supported by a lack of density dependent effects in most of the recovering populations and the high population rates of increase observed. This predominantly positive prognosis is in contrast with that emerging from most of the rest of the African continent where the populations are under greater threat because of habitat restriction and direct human conflict. This preliminary assessment of elephant population persistence suggests that "viable" populations may lie between 400 and 6000 individuals. Although not inconsistent with information-greedy genetic and demographic models, the relationship between population growth versus genetic and demographic models should be further investigated. The implementation of a metapopulation management strategy towards these smaller populations is advocated. In addition, as all of the populations included in this analysis have been afforded some degree of protection since the 1920s, continued protection would be a prerequisite for their continued survival. [PUBLICATION ABSTRACT]
ISSN:1420-2026
1573-2967
DOI:10.1023/a:1019047830364