Andrew Purdon

Andrew Purdon
MAP Scientific Services

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16
Publications
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141
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Publications

Publications (16)
Article
African elephants (Loxodonta africana) are well-studied and inhabit diverse landscapes that are being transformed by both humans and natural forces. Most tools currently in use are limited in their ability to predict how elephants will respond to novel changes in the environment. Individual-, or agent-based modeling (ABM), may extend current method...
Article
Full-text available
Migration is an important, but threatened ecological process. Conserving migration requires the maintenance of functional connectivity across sufficiently large areas. Therefore, we need to know if, where and why species migrate. Elephants are highly mobile and can travel long distances but we do not know if they migrate. Here, we analysed the move...
Article
Full-text available
Contradictory findings among scientific studies that address a particular issue may impede the conversion of science to management implementation. A systematic review of peer-reviewed studies to generate a single outcome may overcome this problem. The contentious topic of the impact that a megaherbivore such as the savanna elephant have for other s...
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The number of papers published each year since 1947 on the effect that elephant had on the environment. (TIF)
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Frequency distributions of the individual elephant effects (k) on soil properties. (TIF)
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Selection parameters of the candidate generalized linear mixed-effects models that describe the variation in direct effects. (DOCX)
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The PRISMA flow diagram. (DOCX)
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Complete list of scholarly papers on elephant impact. (DOCX)
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R code for the analyses. (DOCX)
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Type, description, and source of the variables included in the generalized linear mixed-effects models to explain elephant impact. (DOCX)
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Selection parameters of the candidate generalized linear mixed-effects models that describe the variation in indirect effects. (DOCX)
Article
Full-text available
Savannas once constituted the range of many species that human encroachment has now reduced to a fraction of their former distribution. Many survive only in protected areas. Poaching reduces the savanna elephant, even where protected, likely to the detriment of savanna ecosystems. While resources go into estimating elephant populations, an ecologic...
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Additional methods and supporting results and references. This file contains Supporting Information Materials and Methods; Figure A (study schematic), Figure B (23 time series and best-fit population models); Figure C (partial residual plots of components of model averaged GLM to explain PIKE values from MIKE sites); Figure D (comparison of GAMs to...

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