Robert Guldemond

Robert Guldemond
University of Pretoria | UP · Conservation Ecology Research Unit (CERU)

PhD

About

31
Publications
10,165
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483
Citations
Additional affiliations
January 2006 - present
University of Pretoria
Position
  • Researcher

Publications

Publications (31)
Article
Full-text available
Across Africa, space for conservation is sometimes limited to formally protected areas that have become progressively more isolated. There is a need for targeted conservation initiatives such as the demarcation of landscape connections, defined as areas that encompass environmental variables that promote the natural movement of individuals between...
Article
Full-text available
The influence of protected areas on the growth of African savannah elephant populations is inadequately known. Across southern Africa, elephant numbers grew at 0.16% annually for the past quarter century. Locally, much depends on metapopulation dynamics—the size and connections of individual populations. Population numbers in large, connected, and...
Article
Full-text available
Disturbances that change population structure may evoke transient dynamics that can be assessed within a demographic resilience framework. Conservation management interventions are conceptually disturbances that can be evaluated through such a framework to inform management actions and goals. The Main Camp in Addo Elephant National Park in South Af...
Article
Full-text available
The cause of deaths of 350 elephants in 2020 in a relatively small unprotected area of northern Botswana is unknown, and may never be known. Media speculations about it ignore ecological realities. Worse, they make conjectures that can be detrimental to wildlife and sometimes discredit conservation incentives. A broader understanding of the ecologi...
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...
Data
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)
Data
Selection parameters of the candidate generalized linear mixed-effects models that describe the variation in indirect effects. (DOCX)
Article
Questions Can trends derived from chronosequences (space) be compared with those derived from repeated surveys (time) to validate the use of space-for-time substitution? Can this approach provide insight into the dynamics of vegetation in rehabilitating forests? Location Rehabilitating coastal dune forest in KwaZulu-Natal, South Africa. Methods...
Chapter
Coastal ecosystems are centres of high biological productivity, but their conservation is often threatened by numerous and complex environmental factors. Citing examples from the major littoral habitats worldwide, such as sandy beaches, salt marshes and mangrove swamps, this text characterises the biodiversity of coastline environments and highligh...
Article
Full-text available
We questioned the capability of post-mining rehabilitation and successional changes in coastal vegetation to achieve restoration of dune forest, dung beetle assemblages in the Maputaland Centre of Endemism, South Africa. A repeat 2010 study of structural turnover between dung beetle assemblages across a 33 year successional sere of rehabilitating v...
Article
In their article “Assessing the evidence base for restoration in South Africa,” Ntshotsho et al. attempt to determine whether restoration in South Africa is evidence based by reporting on 10 projects' baseline data collection, goal setting, and monitoring. However, their contribution suffers from two major constraints. First, they confuse assessing...
Article
Aim To examine the response of forest‐dependent and generalist bird assemblages and feeding guilds to patch characteristics of forest fragments in the context of island biogeography and metapopulation theories in an area that supports high levels of species diversity and endemism. Location Dune, riverine, sand and swamp forest fragments in southern...
Article
Full-text available
The apparent influence of elephants on the structure of savannahs in Africa may be enhanced by management activities, fire and other herbivores. We separated the effect elephants have on grasses, woody seedlings (<0.5 m) and saplings (0.5–2 m) from the effect of tree canopies (canopy effect), and herbivory (park effect). We defined the canopy effec...
Article
Full-text available
: Large herbivores such as elephants (Loxodonta africana) apparently have a negative impact on woody vegetation at moderate to high population densities. The confounding effects that fire, drought, and management history have may complicate assignment of such impacts to herbivory. We reviewed 238 studies published over 45 years and conducted a meta...
Chapter
Full-text available
T HE PREVAILING INCREASE IN ELEPHANT numbers across areas of southern Africa raises concern for their impact on biological diversity. Several approaches to elephant management focus on limiting numbers to alleviate these consequences. However, landscape fragmentation, fences, water supple-mentation as well as the shape and size of some conservation...
Article
Full-text available
Elephants confined to protected areas could affect co-occurring species. We expected measurable deviations in the density, species number, turnover and composition, abundance-incidence and rank-abundance patterns of woody plant communities where elephants browse. We examined these variables in the presence (inside South Africa's Tembe Elephant Park...
Article
Full-text available
This article compares aerial survey data from the Kafue NP and surrounding GMAs from 1991 to 2004. This was done in part to check the precision of the counts and in part as a reviews the apparent situation in Zambia which suggests that unlike other southern Afican areas the elepahant population of Zambia is decreasing rather than increasing. The es...
Article
Full-text available
Abstract Weinvestig ated the effects of confinement for spatial and landscape use by elephants inMaputaland. We constructed 95% minimum convex ,polygons ,home range ,areas and used compositional analysis to determine landscape selection. Elephants ,in southern Mozambique roam freely while those in Tembe Elephant Park are confined. Free-ranging indi...
Article
Full-text available
Abstract in English. Thesis (Ph.D.) (Zoology))-University of Pretoria, 2006. Includes bibliographical references. Adobe Acrobat Reader needed to open files.

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