Raymond Jansen

Prof. Raymond Jansen

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Research Focus & Metrics

Academic Career Length

21Years (2006-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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20 January 2015 in PLOS ONE
Verified
Journal Article
Open access
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MBMaxwell Boakye
Maxwell Boakye
DPDarren William Pietersen
Darren William Pietersen
AKAntoinette Kotzé
Antoinette Kotzé
DDDesire Dalton
Desire Dalton
RJRaymond Jansen
Raymond Jansen
Traditional medicine has been practised in Ghana for centuries with the majority of Ghanaians still patronising the services of traditional healers. Throughout Africa a large number of people use pangolins as a source of traditional medicine, however, there is a dearth of information on the use of animals in folk medicine in Ghana, in particular the use of pangolins. The aim of this study was to determine the prevalent use of pangolins and the level of knowledge of pangolin use among traditional healers in Ghana for the treatment of human ailments. Data was gathered from 48 traditional healers using semi-structured interviews on the traditional medicinal use of pangolin body parts in the Kumasi metropolis of Ghana. The cultural importance index, relative frequency of citation, informant agreement ratio and use agreement values were calculated to ascertain the most culturally important pangolin body part as well as the level of knowledge dissemination among traditional healers with regards pangolin body parts. Our study revealed that 13 body parts of pangolins are used to treat various medicinal ailments. Pangolin scales and bones were the most prevalent prescribed body parts and indicated the highest cultural significance among traditional healing practices primarily for the treatment of spiritual protection, rheumatism, financial rituals and convulsions. Despite being classified under Schedule 1 of Ghana’s Wildlife Conservation Act of 1971 (LI 685), that prohibits anyone from hunting or being in possession of a pangolin, our results indicated that the use of pangolins for traditional medicinal purposes is widespread among traditional healers in Ghana. A study on the population status and ecology of the three species of African pangolins occurring in Ghana is urgently required in order to determine the impact this harvest for traditional medical purposes has on their respective populations as current levels appear to be unmonitored and unsustainable.

20 November 2014 in Journal of Ethnobiology and Ethnomedicine
Verified
Journal Article
Open access
PDF file
MBMaxwell Boakye
Maxwell Boakye
DPDarren W Pietersen
Darren W Pietersen
AKAntoinette Kotzé
Antoinette Kotzé
DDDesire Dalton
Desire Dalton
RJRaymond Jansen
Raymond Jansen
Pangolins (Manidae) have long been used for traditional medicinal purposes in most parts of sub-Saharan Africa. However, very little is known about the extent of this use, the body parts that are used and the ailments these practices are attempting to cure or alleviate. Pangolin body parts are used extensively and frequently by traditional medical practitioners in Sierra Leone. A total of 63 traditional medical practitioners consented and were interviewed using semi-structured questionnaires on the traditional medicinal use of pangolin body parts. The use value, informant agreement ratio and use agreement value for each pangolin part was calculated to ascertain the most sought after body part, the level of knowledge dissemination among traditional medical practitioners about body parts and the most culturally significant body part. It was found that 22 pangolin parts are used to treat various ailments and conditions under 17 international categories of diseases. The highest use value was recorded for scales while eyes had the highest level of consensus among the traditional medical practitioners. The highest use value and informant agreement ratio for scales were recorded for spiritual ailments. Scales were the most culturally significant body part according to the use agreement value. This study indicates a high importance value for pangolins as part of these communities’ spiritual, cultural and medicinal beliefs. However, the numbers of individuals harvested from the wild remains unknown and unregulated even though pangolins have been listed under Schedule 2 of the Wildlife Conservation Act, 1972, of Sierra Leone, which prohibits any person from hunting or being in possession of pangolins. It is likely that this unregulated harvesting and poaching of this threatened species, for medicinal purposes, is unsustainable and there is an urgent need to determine pangolin population abundance within this region to ensure their sustainable harvesting for cultural use and conservation.

15 May 2021 in Journal of Experimental Biology
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Journal Article
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LMLesedi L. Moagi
Lesedi L. Moagi
ABAmanda R. Bourne
Amanda R. Bourne
SCSusan J. Cunningham
Susan J. Cunningham
RJRaymond Jansen
Raymond Jansen
CNCeliwe A. Ngcamphalala
Celiwe A. Ngcamphalala
AMAndrew E. McKechnie
Andrew E. McKechnie
Relatively little effort has been directed towards elucidating the role of physiological stress pathways in mediating avian responses to global heating. For free-ranging southern pied babblers, Turdoides bicolor, daily maximum air temperatures (Tmax) between ∼35 and ∼40°C result in reduced foraging efficiency, loss of body mass and compromised breeding success. We tested the hypothesis that very hot days are experienced as stressors by quantifying relationships between Tmax and faecal glucocorticoid metabolite (fGCM) levels in naturally excreted droppings. On days when Tmax38°C, however, fGCM levels increased linearly with Tmax and averaged 190.79±70.13 ng g−1 dry mass. The effects of Tmax on fGCM levels did not carry over to the following morning, suggesting that very hot days are experienced as acute stressors.

4 January 2013 in Insect Conservation and Diversity
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Journal Article
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RJRaymond Jansen
Raymond Jansen
LMLukhanyo Makaka
Lukhanyo Makaka
ILIan T. Little
Ian T. Little
ADAnsie Dippenaar‐Schoeman
Ansie Dippenaar‐Schoeman

25 March 2015 in Bothalia, African Biodiversity & Conservation
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Journal Article
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ILIan T. Little
Ian T. Little
PHPhilip A.R. Hockey†
Philip A.R. Hockey†
RJRaymond Jansen
Raymond Jansen
Background: Grasslands are heavily utilised for livestock agriculture and the resultant degradation through mismanagement contributes to an estimated 60% of this biome being permanently transformed. This study focused on the impact of fire and grazing in moist highland grasslands.Objectives: To determine the contribution of burning frequency and grazing intensity combined (for domestic livestock and indigenous ungulates) on vegetation structure heterogeneity and species diversity.Methods: Eight study sites under different management regimes were sampled over two summers. Vegetation structure characteristics and diversity data were collected monthly within multiple replicates in each study site. A disc pasture meter was used to assess standing biomass. Differences in vegetation structure characteristics, plant community composition and plant species assemblage structure across sites were statistically analysed using analyses of variance, indicator species analyses, multidimensional scaling ordinations and two-way cluster analyses.Results: The combination of heavy grazing and annual burning leads to a distinct plant community dominated by disturbance specialist species. Selective grazing by indigenous herbivores promotes a community of unpalatable species. This study illustrates that fenced indigenous herbivores, even at moderate stocking densities, have a greater detrimental impact on plant diversity and structure than do domestic livestock.Conclusion: Intensive grazing and burning have a detrimental impact on plant species diversity and structure. This also affects resultant palatability for grazing livestock and fenced game. To promote both grazing quality and ecological integrity we recommend a minimum sustainable ‘fodder capacity’ or standing phytomass of 5000 kg per large-animal unit per hectare for domestic livestock in moist highland grasslands.

16 August 2018 in Society & Animals
Verified
Journal Article
Closed access
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ABAbimbola O. Baiyewu
Abimbola O. Baiyewu
MBMaxwell Boakye
Maxwell Boakye
AKAntoinette Kotzé
Antoinette Kotzé
DDDesire Dalton
Desire Dalton
RJRaymond Jansen
Raymond Jansen
Pangolins are elusive and threatened mammals, considered the most widely traded mammals on Earth supplying local African and Asian traditional medicine markets. African pangolins are sourced as bushmeat and perceived to cure diverse ailments when body parts are used in traditional medicine practices. Currently, there is no documentation on cultural uses of Temminck’s ground pangolin throughout this mammal’s distribution range in South Africa. We interviewed 344 community members from seven indigenous tribal communities in four provinces overlapping with the distribution of Smutsia temminckii in South Africa; only 191 respondents (55.5%) had any knowledge of the species, its cultural and/or medicinal uses. Pangolin is highly sought after and held in high regard where this mammal’s body parts, particularly scales, blood and fat, are utilized traditionally for treating various physical ailments and spiritual remedies in rural South African communities. This utilization undoubtedly has a significant impact on the population of this threatened species.