Academic literature on the topic 'African elephant – Effect of poaching on'
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Journal articles on the topic "African elephant – Effect of poaching on"
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Farah, Naima, and John R. Boyce. "Elephants and mammoths: the effect of an imperfect legal substitute on illegal activity." Environment and Development Economics 24, no. 3 (February 27, 2019): 225–51. http://dx.doi.org/10.1017/s1355770x18000554.
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AbstractIn response to the CITES ban on trade in elephant ivory, mammoth ivory began to be produced in post-Soviet Russia. We investigate how this substitute to elephant ivory has affected the poaching of elephants. We argue that the early success of the 1989 ivory ban at increasing the African elephant population was driven in part by increasing supply of mammoth ivory. The more recent increases in poaching appear to be driven by increasing demand and falling African institutional quality. We find that absent the 80 tonnes of Russian mammoth ivory exports per annum 2010–2012, elephant ivory prices would have doubled from their $ 100 per kilogram level and that the current poaching level of 34,000 elephants per year may have increased by as many as 55,000 elephants per year on a population of roughly half a million animals.
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Foley, Charles A. H., and Lisa J. Faust. "Rapid population growth in an elephant Loxodonta africana population recovering from poaching in Tarangire National Park, Tanzania." Oryx 44, no. 2 (January 12, 2010): 205–12. http://dx.doi.org/10.1017/s0030605309990706.
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AbstractWe studied the demography of a subpopulation of African elephants Loxodonta africana in Tarangire National Park, Tanzania, from 1993 to 2005. The Tarangire elephants had been affected by heavy poaching prior to 1993. We monitored 668 individually known elephants in 27 family groups. The population increased from 226 to 498 individuals, with mean group size increasing from 8.4 to 18.3. The average annual growth rate was 7.1% (range 2.0–16.9%). This approaches the maximal growth rate for African elephants, with corresponding minimal values for demographic parameters. The mean interbirth interval was 3.3 years, mean age of first reproduction 11.1 years, average annual mortality of elephants younger than 8 years 3%, and average annual mortality of adult females 1%. Probability of conceiving was positively correlated with annual rainfall. No significant density-dependent effects were recorded. Rapid growth was aided by high rainfall, low population density and release from the stresses of poaching. These results demonstrate that elephant populations are capable of rapid population increases for extended periods of time given the right ecological and social conditions. This has consequences for elephant conservation and management.
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Szott, Isabelle D., Yolanda Pretorius, Andre Ganswindt, and Nicola F. Koyama. "Physiological stress response of African elephants to wildlife tourism in Madikwe Game Reserve, South Africa." Wildlife Research 47, no. 1 (2020): 34. http://dx.doi.org/10.1071/wr19045.
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Abstract ContextWildlife tourism has been shown to increase stress in a variety of species and can negatively affect survival, reproduction, welfare, and behaviour of individuals. In African elephants, Loxodonta africana, increased physiological stress has been linked to use of refugia, rapid movement through corridors, and heightened aggression towards humans. However, we are unaware of any studies assessing the impact of tourism pressure (tourist numbers) on physiological stress in elephants. AimsWe used faecal glucocorticoid metabolite (fGCM) concentrations to investigate whether tourist numbers in Madikwe Game Reserve, South Africa, were related to changes in physiological stress in elephants. MethodsWe repeatedly collected dung samples (n=43) from 13 individually identified elephants over 15 months. Using a generalised linear mixed model and a Kenward–Roger approximation, we assessed the impact of monthly tourist numbers, season, age, and sex on elephant fGCM concentrations. Key resultsHigh tourist numbers were significantly related to elevated fGCM concentrations. Overall, fGCM concentrations increased by 112% (from 0.26 to 0.55µgg−1 dry weight) in the months with the highest tourist pressure, compared to months with the lowest tourist pressure. ConclusionsManagers of fenced reserves should consider providing potential alleviation measures for elephants during high tourist pressure, for example, by ensuring that refuge areas are available. This may be of even higher importance if elephant populations have had traumatic experiences with humans in the past, such as poaching or translocation. Such management action will improve elephant welfare and increase tourist safety. ImplicationsAlthough tourism can generate substantial revenue to support conservation action, careful monitoring of its impact on wildlife is required to manage potential negative effects.
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Selier, Sarah-Anne Jeanetta, Rob Slotow, and Enrico Di Minin. "The influence of socioeconomic factors on the densities of high-value cross-border species, the African elephant." PeerJ 4 (October 27, 2016): e2581. http://dx.doi.org/10.7717/peerj.2581.
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Unprecedented poaching levels triggered by demand for ivory in Far East Asia are threatening the persistence of African elephantLoxodonta africana. Southern African countries make an important contribution to elephant conservation and could soon become the last stronghold of elephant conservation in Africa. While the ecological factors affecting elephant distribution and densities have extensively been accounted for, there is a need to understand which socioeconomic factors affect elephant numbers in order to prevent conflict over limited space and resources with humans. We used elephant count data from aerial surveys for seven years in a generalized linear model, which accounted for temporal correlation, to investigate the effect of six socioeconomic and ecological variables on the number of elephant at the country level in the Greater Mapungubwe Transfrontier Conservation Area (GMTFCA). Important factors in predicting elephant numbers were the proportion of total land surface under cultivation, human population density and the number of tourists visiting the country. Specifically, elephant numbers were higher where the proportion of total land surface under cultivation was the lowest; where population density was the lowest and where tourist numbers had increased over the years. Our results confirm that human disturbance is affecting elephant numbers, but highlight that the benefits provided by ecotourism could help enhance elephant conservation. While future studies should include larger areas and more detailed data at the site level, we stress that the development of coordinated legislation and policies to improve land-use planning are needed to reduce the impact of increasing human populations and agriculture on elephant.
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Peters, Anne. "Elephant Poaching and Ivory Trafficking as a Threat to the Peace." AJIL Unbound 108 (2014): 162–65. http://dx.doi.org/10.1017/s2398772300002087.
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The two African states Democratic Republic of Congo and the Central African Republic have been struck by civil war enmeshed with military involvement of neighbouring states. The ongoing conflicts have been fuelled by the fight over the countries’ natural resources, ranging from diamonds over gold to ivory. Since the end of the 1990s, the UN Security Council and other UN bodies have been dealing with the conflicts in Congo, and have been trying to bring to an end and to sanction the serious violations of human rights and of IHL that have been committed by all sides in those conflicts. The international community’s attempt to come to grips with the so-called “blood diamonds”, inter alia through a multi-stakeholder process and certification scheme is well known. With two resolutions of January 2014, the UN Security Council addresses the destabilizing effects of the illegal exploitation of wildlife.
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Wiśniewska, Maggie, Ivan Puga-Gonzalez, Phyllis Lee, Cynthia Moss, Gareth Russell, Simon Garnier, and Cédric Sueur. "Simulated poaching affects global connectivity and efficiency in social networks of African savanna elephants—An exemplar of how human disturbance impacts group-living species." PLOS Computational Biology 18, no. 1 (January 18, 2022): e1009792. http://dx.doi.org/10.1371/journal.pcbi.1009792.
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Selective harvest, such as poaching, impacts group-living animals directly through mortality of individuals with desirable traits, and indirectly by altering the structure of their social networks. Understanding the relationship between disturbance-induced, structural network changes and group performance in wild animals remains an outstanding problem. To address this problem, we evaluated the immediate effect of disturbance on group sociality in African savanna elephants—an example, group-living species threatened by poaching. Drawing on static association data from ten free-ranging groups, we constructed one empirically based, population-wide network and 100 virtual networks; performed a series of experiments ‘poaching’ the oldest, socially central or random individuals; and quantified the immediate change in the theoretical indices of network connectivity and efficiency of social diffusion. Although the social networks never broke down, targeted elimination of the socially central conspecifics, regardless of age, decreased network connectivity and efficiency. These findings hint at the need to further study resilience by modeling network reorganization and interaction-mediated socioecological learning, empirical data permitting. The main contribution of our work is in quantifying connectivity together with global efficiency in multiple social networks that feature the sociodemographic diversity likely found in wild elephant populations. The basic design of our simulation makes it adaptable for hypothesis testing about the consequences of anthropogenic disturbance or lethal management on social interactions in a variety of group-living species with limited, real-world data.
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Mkuburo, Lameck, Cuthbert Nahonyo, Josephine Smit, Trevor Jones, and Edward Kohi. "Investigation of the effect of poaching on African elephant (Loxodonta africana) group size and composition in Ruaha National Park, Tanzania." Scientific African 9 (September 2020): e00490. http://dx.doi.org/10.1016/j.sciaf.2020.e00490.
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Ishengoma, D. R. S., A. M. Shedlock, C. A. H. Foley, L. J. Foley, S. K. Wasser, S. T. Balthazary, and B. M. Mutayoba. "Effects of poaching on bull mating success in a free ranging African elephant (Loxodonta africana) population in Tarangire National Park, Tanzania." Conservation Genetics 9, no. 2 (May 15, 2007): 247–55. http://dx.doi.org/10.1007/s10592-007-9332-0.
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Naha, Dipanjan, Suraj Kumar Dash, Abhisek Chettri, Akashdeep Roy, and Sambandam Sathyakumar. "Elephants in the neighborhood: patterns of crop-raiding by Asian elephants within a fragmented landscape of Eastern India." PeerJ 8 (July 2, 2020): e9399. http://dx.doi.org/10.7717/peerj.9399.
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Loss of forest cover, rise in human populations and fragmentation of habitats leads to decline in biodiversity and extinction of large mammals globally. Elephants, being the largest of terrestrial mammals, symbolize global conservation programs and co-occur with humans within multiple-use landscapes of Asia and Africa. Within such shared landscapes, poaching, habitat loss and extent of human–elephant conflicts (HEC) affect survival and conservation of elephants. HEC are severe in South Asia with increasing attacks on humans, crop depredation and property damage. Such incidents reduce societal tolerance towards elephants and increase the risk of retaliation by local communities. We analyzed a 2-year dataset on crop depredation by Asian elephants (N = 380) events in North Bengal (eastern India). We also explored the effect of landscape, anthropogenic factors (area of forest, agriculture, distance to protected area, area of human settlements, riverine patches and human density) on the spatial occurrence of such incidents.Crop depredation showed a distinct nocturnal pattern (22.00–06:00) and majority of the incidents were recorded in the monsoon and post-monsoon seasons. Results of our spatial analysis suggest that crop depredation increased with an increase in the area of forest patches, agriculture, presence of riverine patches and human density. Probability of crop depredation further increased with decreasing distance from protected areas. Villages within 1.5 km of a forest patch were most affected. Crop raiding incidents suggest a deviation from the “high-risk high-gain male biased” foraging behavior and involved proportionately more mixed groups (57%) than lone bulls (43%). Demographic data suggest that mixed groups comprised an average of 23 individuals with adult and sub adult females, bulls and calves. Crop depredation and fatal elephant attacks on humans were spatially clustered with eastern, central and western parts of North Bengal identified as hotspots of HEC. Our results will help to prioritize mitigation measures such as prohibition of alcohol production within villages, improving condition of riverine patches, changing crop composition, fencing agriculture fields, implement early warning systems around protected areas and training local people on how to prevent conflicts.
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Chakanyuka, Tatenda Leopold. "CITES and the African Elephant." Chinese Journal of Environmental Law 4, no. 1 (June 3, 2020): 44–70. http://dx.doi.org/10.1163/24686042-12340049.
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Abstract This article focuses on the impact of the ban of international trade of the ivory of the African elephant under the Convention on International Trade in Endangered Species. This species is overpopulated in some countries and threatened in other countries. Overall, its current population and the level of decline suggest a species that is endangered. The population disparities have created misunderstandings in terms of how to address the issues. Controversy has surrounded the two instances of legal sales of ivory, and the continuing ban on ivory trade from 1989 has contributed to animosity between pro-ban Western ‘conservationists’ and anti-ban African countries, with accusations of ‘ecological imperialism’ being levelled at some of the protagonists. The article observes that the vast global ivory market has largely been sustained by countries that have failed to effectively enact laws and/or enforce them, as well as failing to deal with corruption and illegal markets within their jurisdictions. It is argued that identifying such culprit countries and their role in promoting elephant poaching and ivory trade, and identifying the reasons behind the poaching and illegal trade, is crucial in reducing the incidence of poaching. The article argues that with a better understanding of the illegal trade, CITES can take deliberate steps to assist countries involved in the ivory trade where they need that support.
Dissertations / Theses on the topic "African elephant – Effect of poaching on"
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Jansson, Lina. "How to stop the African elephant population from extermination; Causes, Achievements and Consequences." Thesis, Södertörn University College, School of Life Sciences, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-747.
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Humans’ hunting for ivory has had a serious impact of the African elephant population. Ivory has throughout history been a symbol of manhood and status. As the market of ivory expanded to the rest of the world, the market demand for ivory became higher than what the elephants could manage to provide. In the 1980’s, the African elephant population was threatened by extension and it was reduced with 50 percent in ten years. For this reason, CITES placed the African elephant population under a ban, which made it an illegal act to trade ivory and other elephant parts.
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Hook, Margaret Rose. "Effect of Lion Calls on African Elephants (Loxodonta Africana) in Addo Elephant National Park, South Africa." TopSCHOLAR®, 2012. http://digitalcommons.wku.edu/theses/1196.
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Perceived predation risk alters animals’ behavior. This shift in behavior often comes at the cost of attaining resources. Generally, African elephants (Loxodonta africana) experience little predation pressure; however, the risk of predation by lions (Panthera leo) increases other prey species are less abundant. In elephant herds, related females and their offspring travel together in family groups, led by the eldest female. Response to predation pressure was examined by playing lion calls to the population of 437 elephants at the Main Camp Section of Addo Elephant National Park (AENP) in South Africa. Unfamiliar lion calls from a single male and two males, static, and running water were played from a remote speaker to elephants at waterholes. These trials were recorded by video. Behaviors of elephants were then extracted from video into focal observations of thirty second segments before, during and after a sound was played. I analyzed these data using parametric t-tests and non-parametric randomization tests. When no sound was played, elephants did not alter their behavior. Water elicited low levels of distress behaviors. Elephants behaved in a threatened or annoyed manner toward static. Elephants changed their behavior more in response to lion calls than to the controls, namely by decreasing drinking and increasing walking and distress behaviors. I also examined how individuals differed in their responses to the lion calls based on a number of demographic factors. Adult and subadult females performed more social behaviors after lion calls when the matriarch was absent than when she was present. Furthermore, when group size was larger and more calves were present, females decreased drinking and increased time exhibiting distress behaviors. Based on this and other studies it can be concluded that elephants of different demographics perceived similar levels of elevated risk when hearing lion calls. Landscape of fear models are useful for assessing habitat use by prey species in response to real and perceived predation risk. The present study corroborates findings from a study in East Africa that elephants perceive threat from lions based on calls alone and appear to distinguish levels of threat by the number of lions calling.
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Kelly, Henry Lyle Patrick. "The effect of elephant utilisation on the Sterculia rogersii and Adansonia digitata populations of the Kruger National Park." Connect to this title online, 2000. http://upetd.up.ac.za/thesis/available/etd-04032006-101546/.
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Ferry, Nicolas. "Processes involved in the functioning of large mammal communities : the role of the African elephant in the ecology of predator-prey relationships." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1054/document.
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Les communautés écologiques sont connues pour être des systèmes complexes composés de multiple espèces entrant en interaction les unes avec les autres. De nombreux modèles théoriques ont été développés pour étudier les communautés. Certains ont souligné l'importance des effets indirects que les espèces pouvaient avoir les unes sur les autres, tels que les chaînes d'interactions et les modifications d'interactions (par modification du trait d'une des espèces en interaction ou de l'environnement où se déroule l'interaction). Bien que la science expérimentale vienne confirmer le rôle fondamental que pourrait avoir ces effets indirects, peu d'études à l'échelle des communautés en milieu naturel ont été conduites, et encore moins chez les grands mammifères. Le Parc National de Hwange, au Zimbabwe, est un écosystème de savane arborée semiaride caractérisé par une quasi-absence d'eau de surface naturelle (point d'eau, rivière) pendant la saison sèche, et ce n'est qu'avec la création de points d'eau artificiels pompés que la richesse spécifique des communautés de grands mammifères et les fortes abondances animales sont maintenues. De plus, cet écosystème a la remarquable particularité à la fois d'abriter l'une des plus fortes densités d'éléphants, et d'être considéré comme l'un des bastions africains pour sa population de lions. Le lion est connu comme étant un chasseur à l'affût, utilisant les éléments de son habitat (fourrés, souches, hautes herbes, etc.) pour se rapprocher au maximum de sa proie et lui bondir dessus par surprise. De plus, cette espèce semble profiter de l'agrégation des herbivores aux points d'eau pendant la saison sèche pour chasser autour de ces points d'eau. L'éléphant d'Afrique quant à lui est capable d'aménager son milieu et est ainsi susceptible de favoriser l'accès à certaines ressources pour les autres espèces, telles que des abris ou au contraire une meilleure visibilité. En revanche, de par sa masse corporelle exceptionnelle et son régime alimentaire généraliste, il est possible qu'il soit un compétiteur clé pour les autres herbivores. Enfin, étant très nombreux dans l'écosystème étudié, nécessitant de grandes quantités d'eau, et devenant de plus en plus agressifs au fil de la saison sèche, les éléphants influencent l'utilisation des points d'eau par les autres herbivores. Cette thèse porte donc sur le rôle que peuvent avoir les éléphants sur les interactions trophiques entre les lions et leurs proies, via des mécanismes d'effets indirects. Différents axes de recherche sont abordés. Le premier porte sur l'effet des éléphants sur la communauté de grands herbivores aux points d'eau, et plus particulièrement comment ils peuvent influencer leur distribution spatiale, et à terme leur vulnérabilité vis-à-vis des prédateurs. Un évitement spatial des éléphants par les autres herbviores en début de saison sèche suggère fortement que les éléphants sont de potentiels compétiteurs. Cependant, à la fin de la saison sèche, le phénomène s'inverse et certaines espèces d'herbivores se rapprochent fortement des éléphants. Deux scénarios portant sur les mécanismes pouvant expliquer ce patron ont été explorés, sans succès : une nécessité croissante d'accéder à de l'eau de meilleure qualité au niveau des pompes des points d'eau, et une augmentation du risque de prédation qui pourrait rendre les éléphants « attractifs » aux yeux des herbivores, les éléphants adultes étant invulnérables à la prédation et capables de les faire fuir par des comportements de harcèlement. Le deuxième axe de recherche porte sur l'effet des éléphants sur la distribution spatiale des herbivores à l'échelles du paysage et de l'habitat, et sur les conséquences possibles que cela peut avoir sur l'écologie spatiale des prédateurs. L'absence de ségrégation entre éléphants et herbivores ne supporte pas l'hypothèse d'un effet de compétition par exploitation, et l'investigation quant à l'effet sur les prédateurs n'a pas été poussée plus avant... [etc]Species can indirectly affect other species and their interactions. The trophic interaction between a predator and its prey can be modified by the presence of a third species either through chain interactions (e.g. successive predation link) either through interaction modification. However, these indirect received few attentions in theorical modelling of food web, and fewer studies tried to explore this phenomenon at the scale of natural complex communities of large mammals. The role of the elephants as modifier of lion’s trophic interaction is explored in the semi-arid woodland savannah ecosystem of Hwange National Park, Zimbabwe. African elephants, as key competitor (male body mass ~ 4000 kg with aggressive behaviour) shape the behaviour of herbivores at waterholes results do not allow to state on the elephant mediation of lion trophic interaction at waterholes. In addition, elephants seem to facilitate the availability of food resources for impalas, possibly by increasing regrowth of shoots by breaking twigs and stem, as these last select habitats used by elephants. However, not effect of facilitation or competition were observed for the other herbivores, which lead to think that elephants do not influence lion trophic interaction in that way. Finally, by altering the physical environment (i.e. engineer species) the elephants affect the visibility and ambush sites for lions in the woody vegetation and ultimately seem to influence the lion kill site selection. This study suggests that indirect effects may act at the community level even if their observation and quantification are difficult in natural communities. Moreover, it supports the observation that it is important to take into account these indirect effects in order to have a thorough understanding and have a better ability to predict the consequences that disruptions may have on the structure and functioning of communities
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Knott, Edward Joseph. "The effect of elephants (Loxodonta africana, Blumenbach, 1797) on Xeric Succulent Thicket." Thesis, Rhodes University, 2007. http://hdl.handle.net/10962/d1005359.
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This study looks at the impact of elephant feeding on the Xeric Succulent Thicket component of Eastern Cape Subtropical Thicket (ECST) in Addo Elephant National Park (AENP). Observations of elephant feeding were carried out and vegetation transects were surveyed for impact of elephant feeding. The results indicated that the Nyati elephants spent the majority of their time grazing (nearly 90%), particularly the cow-young herds, and especially when the herd gathered in larger numbers. Browsing events were concentrated on Acacia karroo (81%) and there was no significant difference between the sexes in their preference for this species. Despite being subjected to most of the browsing, the majority of A. karroo trees were undamaged and the effect of elephants was generally light. It appears unlikely that, three years after re-introduction to Nyati, the elephants have had an effect on community structure of the vegetation. Surveys were conducted on stands of the alien invasive weed prickly pear Opuntia ficus-indica, and it was recorded that elephants in Nyati have had a dramatic effect on prickly pear, utilising all adult plants assessed and destroying 70% of them. This level of destruction in such a short period of time suggests that prickly pear is a highly favoured species. The results from the present study suggest that elephants can play a role in the control of prickly pear. Results are discussed in terms of elephants as both megaherbivores and keystone species, and as agents of intermediate disturbance.
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Cook, Robin Michael. "Elephant impact on marula trees, and African honeybees as a mitigation method." Thesis, 2017. http://hdl.handle.net/10539/23490.
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A dissertation submitted to the Faculty of Science,
University of the Witwatersrand,
in fulfilment of the requirements for the degree of
Master of Science,
Johannesburg, South Africa
2017Concerns exist over the continual decline of marula trees (Sclerocarya birrea subsp. caffra) as a result of African elephant (Loxodonta africana) impact and a lack of recruitment and regeneration. One strategy of protecting adult marula trees is the usage of elephant mitigation methods. This study took place in Jejane Private Nature Reserve (JPNR), a protected area which recently opened up to the Greater Kruger National Park and had not had elephants in over 100 years. The aim of the study was to investigate the changes to the marula population structure in JPNR three years after the migration of elephants to the area due to fence removal, and to test whether African honeybees (Apis mellifera subsp. scutellata) could be used as a mitigation method for elephant impact on marula trees. A previous size-class survey had been done on a sample of JPNR’s marula population in 2009, prior to the fence removal in 2013. A resurvey of these trees was used to assess the elephant-induced impact and mortality levels on the marula trees and to compare these levels to previously recorded impact and mortality levels on marula trees in the Kruger National Park (KNP). Marula seed predation levels and seedling recruitment were also assessed to address recruitment concerns. The resurveyed marula population had declined by 23.8% post-elephant migration, with the highest annual mortality rates (AMR) and impact scores recorded for trees in the 5 - 11 m height classes. Impact scores on marula trees in JPNR were higher than impact scores recorded on KNP marula trees. Only two marula seedlings were found across all transects, with evidence of high seed predation on marula endocarps. JPNR displayed an adult-dominated marula population with a lack of regeneration, possibly due to a lack of fire which has increased available shelter for seed predators such as small mammals. African honeybees were then used to investigate their effectiveness as an elephant mitigation method and to compare this method against wire-netting (a method experimentally used to prevent ring-barking by elephants). Fifty active beehives were hung from 50 marula trees, with another 50 dummy (inactive) beehives hung from branches on the opposite ends of each beehive tree’s main stem. Fifty additional marula trees were wire-netted and a further 50 were used as control trees. Elephant impact on all 150 trees was measured prior to the addition of treatments and post-treatment addition for nine months. 54% of the control trees received some form of elephant impact, in comparison to 28% of the wire-netted trees and only 2% of the beehive trees. Wire-netting protected marula trees against bark-stripping, but did not prevent elephants from breaking branches. Beehives proved highly efficient at mitigating all forms of elephant impact. The financial cost and maintenance required for the beehive mitigation method is greater than that of wire- netting, but the beehives can provide honey and pollination services as an additional benefit. The results of this study illustrate that African honeybees can be used as an effective non-lethal mitigation method for elephant impact on marula trees and are a viable strategy to reduce human-elephant conflict in South Africa’s protected areas.
MT 2017
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Rode, Sieglinde Corny. "Elephant impact on the large tree component and its potential effect on selected fauna." Diss., 2010. http://hdl.handle.net/10500/4887.
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The aim of the study was to determine the consequences of elephant (Loxodonta africana) impact on selected nesting sites of avian fauna and other species in the Associated Private Nature Reserves. The study also aimed at answering key questions on how the architecture of trees influence nest site suitability and what landscape features affect nest site location. Furthermore the type of impact that elephants have on specific nesting sites was determined and how this would affect the short term persistence of these trees. The facillitatory role of elephants was examined by looking at the type of impact that produces gum exudants as well as what gum is selected for by primates and whether primary branch breaking may lead to the creation of nesting sites for species such as the southern ground hornbill (Bucorvus leadbeateri).Environmental Sciences
M. Sc. (Environmental Management)
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MacGregor, Shaun Donovan. "Influence of drought or elephant on the dynamics of key woodland species in a semiarid African savanna." Thesis, 2000. http://hdl.handle.net/10413/8763.
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Extensive drought - and elephant-related dieback of Colophospermum mopane and Acacia tortitis, respectively, offered an opportunity for increasing understanding of the causes of drought-related patch dieback, the factors influencing elephant utilization of woody plants, and the response of woody plants to both aforementioned determinants of savanna structure and function. The dendrochronological analysis of both species was undertaken to estimate potential rates of replacement, following extensive mortality. Areas of discrete dieback were compared with adjacent paired areas of 'healthy' vegetation, which revealed, on average, 87% and 13% loss of basal area by mortality, respectively. 'Live' and 'dead' plots did not differ in soil type, topography or mean slope, but differed in vegetation structure, soil surface condition, and soil chemistry. Although there was evidence of self-thinning, neither inter - nor intra-specific competition explained dieback. 'Dead', by comparison with 'live' plots, had
changed from functioning as sinks of sediment and water to sources, were less likely to retain water because of a poor soil surface condition, and were predisposed to drought effects because of a greater proportion of fines, and Na concentration. Dieback resulted from insufficient soil water for survival during a drought owing to the development of a dysfunctional landscape during 50 years of livestock ranching. Spatial heterogeneity within a landscape was suggested to enhance woodland resilience to severe droughts by ensuring the survival of plants in run-on sinks or 'drought refuge' sites. Stem sections were removed from 40 multi-stemmed C. mopane trees and prepared for examination under a dissecting microscope. It was impossible to age C. mopane, owing to a hollow and/or dark heartwood. Nevertheless, the distribution of stem diameters suggested a single recruitment event. Fire scars attributed to the last recorded fire in 1948 could explain the trees' multi-stemmed growth form and indicate that most trees of VLNR were > 50 years of age. Growth rings were identified in 29 A. tortilis trees of unknown age, but were not correlated with annual rainfall records. Growth rates varied between trees; mean ring width ranged from 1.4 to 3.5 mm (overall mean 2.4 ± 0.1 mm). A technique was proposed for predicting growth rate from
annual rainfall, using selected data, and several factors potentially influencing ring width in semiarid environs were identified. Permanent ground-based transects were located within riparian (n = 16) and Acacia (n = 5) woodlands to monitor elephant utilization. Elephant had not changed the population structure of the woodlands by 2000, but had reduced stem density from 215.6 stems ha -1 (1996) to 84.4 stems ha -I (2000). Acacia tortitis trees in the woodlands had branches removed, were debarked, uprooted and broken. Acacia tortitis trees in the riverine had lower levels of utilization, whilst Acacia nilotica trees were mostly debarked. The method of elephant feeding varies within and between woody species, provided it is within the mechanical constraints of a certain size or species. Elephant
behaviour is concluded to depend on spatiotemporal variation of forage abundance/quality,
abundance of a preferred species, and species response (coppice or mortality). Elephant can cause a change of vegetation state, and increase spatial homogeneity of a plant population. The remnant population of woodland trees should provide the potential for recolonization, in which case the system would reflect the stable limit cycle. However, if browsing inhibits seedling recruitment, the system could reflect either a multiple stable state system or an artificial equilibrium imposed on a stable limit cycle.Thesis (M.Sc.)-University of Natal, Pietermaritzburg, 2000.
Books on the topic "African elephant – Effect of poaching on"
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Programme, United Nations Environment, Secretariat of the Convention on International Trade in Endangered Species of Wild Fauna and Flora, and International Union for Conservation of Nature and Natural Resources, eds. Elephants in the dust: The African elephant crisis : a rapid response assessment. Nairobi, Kenya: UNEP, 2013.
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Cunliffe, R. N. The impact of the ivory ban on illegal hunting of elephants in Zimbabwe. Causeway, Harare, Zimbabwe: WWF Programme Office, 1994.
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Jayantha, Jayewardene, and Biodiversity and Elephant Conservation Trust, Sri Lanka., eds. Endangered elephants: Past, present, and future : Symposium on Human-Elephant Relationships and Conflicts, Sri Lanka, September 2003. Rajagiriya: Biodiversity and Elephant Conservation Trust, 2004.
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Find full textBook chapters on the topic "African elephant – Effect of poaching on"
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Lemieux, Andrew M., and Ronald V. Clarke. "The International Ban on Ivory Sales and its Effects on Elephant Poaching in Africa." In Transnational Environmental Crime, 397–418. Routledge, 2017. http://dx.doi.org/10.4324/9781315084589-24.
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Gus, Waschefort. "Part II Predominant Security Challenges and International Law, Environmental Security, Ch.33 Wild Fauna and Flora Protection." In The Oxford Handbook of the International Law of Global Security. Oxford University Press, 2021. http://dx.doi.org/10.1093/law/9780198827276.003.0034.
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This chapter explores wild fauna and flora protection. Recently, the United Nations Security Council, which bears ‘primary responsibility for the maintenance of international peace and security’, has adopted a number of resolutions regarding the security situations in the Democratic Republic of Congo and the Central African Republic, in which a nexus is recognized between the poaching and associated illicit trade in wild fauna and flora (particularly elephant ivory) and international peace and security. While the chapter is concerned specifically with the link between the protection of wild fauna and flora and global security, the international legal regime geared towards such protection is most developed in the context of conservation and trade. The chapter looks at the broader conservation framework, with particular emphasis on the regime created by the 1973 Convention on Illegal Trade in Endangered Species of Wild Fauna and Flora (CITES). CITES is the apex instrument for the regulation of trade in wild fauna and flora.
Reports on the topic "African elephant – Effect of poaching on"
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Lucas, Brian. Impact of COVID-19 on Poaching and Illegal Wildlife Trafficking Trends in Southern Africa. Institute of Development Studies (IDS), January 2022. http://dx.doi.org/10.19088/k4d.2022.017.
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This rapid review focuses on the impact COVID-19 pandemic om poaching and illegal wildlife trafficking. It provides an overview of the recent research and summarises the key themes. This review found that poaching for the purpose of international trafficking of illegal wildlife products, generally decreased. These declines are largely attributed to the disruption of transportation routes used by wildlife traffickers to move illicit goods within Southern Africa and overseas by air, and in some locations to the effects of local lockdown measures. Poaching for subsistence consumption (bushmeat) generally increased across Southern Africa and worldwide during the COVID-19 pandemic, incentivised largely by economic hardship and opportunities presented by a reduction in the capacity for anti-poaching enforcement and reduced numbers of tourists, whose presence tends to deter poachers. In the long term, poaching and trafficking are likely to return to pre-pandemic levels. Commercial poachers and traffickers are likely to adjust their transportation routes and adapt their business models to take advantage of opportunities. More positively, some authors have suggested the possibility that the COVID-19 pandemic could influence public attitudes against wildlife trafficking and in support of conservation. Trends in poaching and illegal wildlife trafficking during the COVID-19 pandemic vary significantly across and within countries. The impacts resulting from the measures put in place to reduce the spread of COVID-19 have varied significantly depending on local contexts. Up-to-date data on recent trends during the pandemic are scarce. Good quality data are available on poaching and trafficking of high-value commodities such as elephant ivory and rhino horn, while data on poaching for subsistence are less rigorous and often anecdotal. Much of the evidence available for both types of poaching is not systematic and comes from news media reports, and suffers from inherent difficulties of collecting data on illegal activities. Data collection during the pandemic has also been hampered by the challenges of working safely during the pandemic, funding for monitoring and research has been reduced in most areas, and some reporting processes have not yet analysed data collected during 2021.