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THE NIELSEN COINCIDENCE NUMBER OF MAPS INTO TORI
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jerzy Jezierski --- Department of Mathematics, University of Agriculture, Warszawa, Poland,We give a formula for the Nielsen coincidence number of a pair of maps from a surface into the 2-torus. We also show that a similar formula gives the lower bound of the number of connected components of the coincidence... -
Role of the source community for the recovery of seagrass associated meiofauna: a field colonisation experiment with seagrass mimics in Diani Beach, Kenya
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LN Daudi --- , Kenya JN Uku --- , Kenya M De Troch --- Biology Department, Marine Biology, BelgiumSeagrass communities are subject to frequent disturbances that can affect the associated fauna. Seagrass loss in Kenya has been mainly due to extensive grazing by the sea urchin Tripneustes gratilla, leading to habitat fragmentation. The challenge is whether the system... -
Deja vu? A second mytilid mussel, Semimytilus algosus, invades South Africa's west coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K de Greef --- Department of Biological Sciences and Centre for Invasion Biology, South Africa C L Griffiths --- Department of Biological Sciences and Centre for Invasion Biology, South Africa Z Zeeman --- Department of Biological Sciences and Centre for Invasion Biology, South AfricaA second marine mussel is shown to have invaded South Africa's west coast. Molecular techniques, based on intraspecific gene sequence divergences, prove its identity as Semimytilus algosus, a member of the family Mytilidae, native to Chile. The identity of an... -
Phylogeographic structure of the caridean shrimp Palaemon peringueyi in South Africa: further evidence for intraspecific genetic units associated with marine biogeographic provinces
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PR Teske PW Froneman NP Barker CD McQuaidRecent genetic studies have shown that most widely distributed, passively dispersing invertebrates in southern Africa have regional intraspecific units that are associated with the three main marine biogeographic provinces (cool-temperate, warm-temperate and subtropical). The caridean shrimp Palaemon peringueyi also occurs... -
Phylogenetic relationships and genetic diversity of Nemesis Risso, 1826 species found on different elasmobranch host species off the KwaZulu-Natal coast, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Mangena --- Department of Biodiversity, South Africa BP Jordaan --- Department of Biodiversity, South Africa SM Dippenaar --- Department of Biodiversity, South AfricaMembers of the order Siphonostomatoida (Copepoda) are generally poorly described from South African waters. Nemesis is one of 12 genera in the family Eudactylinidae and includes about nine species. In this study, we investigated whether there is any population structure... -
An unusual coexistence of Addison's disease and phaeochromocytoma
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: H Atmaca --- Department of Endocrinology and Metabolism, Turkey F Gokosmanoglu --- Department of Endocrinology and Metabolism, Turkey EK Kan --- Department of Endocrinology and Metabolism, Turkey GC Ecemis --- Department of Endocrinology and Metabolism, Turkey CT Bahadir --- Department of Endocrinology and Metabolism, Turkey -
A survey of corticosteroid use for the management of septic shock
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: K Govender --- Department of Anaesthetics, RN Rodseth --- Perioperative Research Group, Department of Anaesthetics,Background: Critical illness is associated with pituitary-adrenal axis dysfunction, and may cause adrenal insufficiency that manifests as septic shock that is poorly responsive to fluid or inotropic therapy. Administering a low-dose corticosteroid to these patients results in faster shock resolution,... -
Regional infraclavicular blocks via the coracoid approach for below-elbow surgery: a comparison between ultrasound guidance with, or without, nerve stimulation
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: FMT Azmin --- Department of Anaesthesiology and Intensive Care, Malaysia YC Choy --- Department of Anaesthesiology and Intensive Care, MalaysiaThis randomised, observer-blinded study compared brachial plexus infraclavicular block under ultrasound guidance with, or without, nerve stimulation, for patients undergoing below-elbow surgery. -
Secondary dyslipidaemia
Item type: Journal Article • Journal: South African Family Practice • Authors: DJ Blom --- Division of Lipidology, Department of Medicine,Plasma lipid levels are determined by the interplay of environmental and genetic factors. Occasionally environmental factors may alter lipid levels significantly, resulting in secondary dyslipidaemia. The lipid phenotype in secondary dyslipidaemia is very variable (e.g. predominant hypercholesterolaemia, hypertriglyceridaemia or changes... -
An unusual coexistence of Addison's disease and phaeochromocytoma
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: H Atmaca --- Department of Endocrinology and Metabolism, Turkey F Gokosmanoglu --- Department of Endocrinology and Metabolism, Turkey EK Kan --- Department of Endocrinology and Metabolism, Turkey GC Ecemis --- Department of Endocrinology and Metabolism, Turkey CT Bahadir --- Department of Endocrinology and Metabolism, Turkey -
Modelling dominant height and site index in different edaphoclimatic zones of Nothofagus dombeyi secondary forest in the Andes of south-central Chile
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Carlos Esse --- Universidad Católica de Temuco, Escuela de Ciencias Forestales, Chile Pablo J Donoso --- Universidad Austral de Chile, Instituto de Bosques y Sociedad, Chile Víctor Gerding --- Universidad Austral de Chile, Instituto de Bosques y Sociedad, Chile Celso Navarro --- Universidad Católica de Temuco, Escuela de Ciencias Forestales, Chile Francisco Encina-Montoya --- Universidad Católica de Temuco, Escuela de Ciencias Ambientales, ChileNothofagus dombeyi grows in a wide variety of sites. The information about its productivity is still scarce, which makes it difficult for foresters and landowners to take decisions about the best practices to maintain and/or improve the goods and services... -
Physiological stress levels in the endemic and endangered Udzungwa red colobus vary with elevation
Item type: Journal Article • Journal: African Zoology • Authors: Claudia Barelli --- Sezione di Biodiversità Tropicale, MUSE – Museo delle Scienze, Italy Francesco Rovero --- Sezione di Biodiversità Tropicale, MUSE – Museo delle Scienze, Italy Keith Hodges --- Reproductive Biology Unit, German Primate Center, Germany Alessandro Araldi --- Reproductive Biology Unit, German Primate Center, Germany Michael Heistermann --- Endocrinology Laboratory, German Primate Centre, GermanyHabitat loss and fragmentation inevitably cause biodiversity decline, a major concern for the conservation of endangered species. Primates are of particular interest, because they are highly vulnerable to forest fragmentation. In this study, we investigated faecal glucocorticoid measurements (FGCM), an... -
Molecular diversity and phylogenetic relationships of the gastropod genus Melanoides in Lake Malawi
Item type: Journal Article • Journal: African Zoology • Authors: Louise Von Gersdorff Sørensen --- Mandahl-Barth Research Center for Biodiversity and Health, DBL — Institute for Health Research and Development, Denmark Aslak Jørgensen --- Mandahl-Barth Research Center for Biodiversity and Health, DBL — Institute for Health Research and Development, Denmark Thomas K. Kristensen --- Mandahl-Barth Research Center for Biodiversity and Health, DBL — Institute for Health Research and Development, DenmarkThe freshwater snails belonging to the genus Melanoides Olivier, 1804 are widespread across tropical regions of the world and endemic species have evolved in the African Lakes Malawi, Mweru and Tanganyika. The endemic Melanoides species of Lake Malawi have been... -
The social correlates of self-directed behaviour and faecal glucocorticoid levels among adult male olive baboons (Papio hamadryas anubis) in Gashaka-Gumti National Park, Nigeria
Item type: Journal Article • Journal: African Zoology • Authors: Jacklyn J. Ellis --- Centre for Research in Evolutionary Anthropology, Roehampton University, U.K. Ann M. MacLarnon --- Centre for Research in Evolutionary Anthropology, Roehampton University, U.K. Michael Heistermann --- Reproductive Biology Unit, German Primate Centre, Germany Stuart Semple --- Centre for Research in Evolutionary Anthropology, Roehampton University, U.K.Sociality confers many benefits to gregarious animals, but group-living does not come without associated costs. Social living can cause anxiety, which if prolonged can lead to stress. We investigate correlates of anxiety and stress among wild adult male olive baboons... -
Determining adrenocortical activity as a measure of stress in African buffalo (Syncerus caffer) based on faecal analysis
Item type: Journal Article • Journal: African Zoology • Authors: A. Ganswindt --- Mammal Research Institute, Department of Zoology and Entomology, South Africa A.S.W. Tordiffe --- National Zoological Gardens of South Africa, South Africa E. Stam --- Mammal Research Institute, Department of Zoology and Entomology, South Africa M.J. Howitt --- National Zoological Gardens of South Africa, South Africa F. Jori --- Mammal Research Institute, Department of Zoology and Entomology, South AfricaLittle is known about the levels of stress experienced by African buffalos affected by injury, disease, or socio-ecological and anthropogenic factors. To be able to start filling this gap, we examined the suitability of two 11-oxoaetiocholanolone enzyme-immunoassays (EIAs) detecting 11,17... -
Price earnings ratios on the Johannesburg Stock Exchange - Are they a guide to value?
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: G D I Barr --- Department of Statistical Science and Economics, B S Kantor --- Department of Economics,This paper tests whether there is an equilibrium relationship between prices and earnings on the Johannesburg Stock Exchange (JSE). Such a relationship would hold if the JSE Index and index earnings were cointegrated, A full explanation of the technique of... -
The mitochondrial cytochrome c oxidase I gene reveals phylogeographic structure in the African Goshawk Accipiter tachiro (Accipitridae)
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Kurt Jordaens --- Joint Experimental Molecular Unit, Belgium Floris C Breman --- Joint Experimental Molecular Unit, Belgium Gontran Sonet --- Joint Experimental Molecular Unit, Belgium Zoltán T Nagy --- Joint Experimental Molecular Unit, Belgium Michel Louette --- Vertebrates Section, BelgiumWe used a 298 bp fragment of the mitochondrial cytochrome c oxidase subunit I gene (COI) to examine sequence variation in (mostly) museum specimens of the African Goshawk Accipiter tachiro. Our results showed two clades with high bootstrap support in a... -
Haemangioma of the cervix: a rare cause of postcoital bleeding
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: A M Gan --- Department of Obsterics and Gynecology, India G S Durdi --- Department of Obsterics and Gynecology, India B Y Sherigar --- Department of Obsterics and Gynecology, India S S Patted --- Department of Obsterics and Gynecology, India P R Malur --- Department of Pathology, India -
Epithelioid trophoblastic tumour: a report of two cases
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: MMA Elhassan --- Radiation Oncology Department, Sudan H-T Wu --- Department of Anatomical Pathology, AL Van Wijk --- Department of Radiation Oncology, -
Non-invasive measurement of adrenocortical activity in a myrmecophageous mammal, the bat-eared fox
Item type: Journal Article • Journal: African Zoology • Authors: Aliza Le Roux --- Zoology and Entomology, South Africa Helene Botha --- Zoology and Entomology, South Africa Fredrik Dalerum --- Research Unit of Biodiversity (UO, CSIC, PA), Spain Andre Ganswindt --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South AfricaMeasuring physiological stress reactions through the quantification of plasma cortisol often involves physical restraint, which acts as a stressor itself. Here, we present the validation of a non-invasive method for assessing adrenocortical activity as an indicator of stress in the... -
The invasive Asian green mussel Perna viridis in South Africa: all that is green is not viridis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JM Micklem --- Centre for Invasion Biology, Department of Biological Sciences, South Africa CL Griffiths --- Centre for Invasion Biology, Department of Biological Sciences, South Africa N Ntuli --- South African Institute for Aquatic Biodiversity, South Africa M Mwale --- South African Institute for Aquatic Biodiversity, South AfricaThe Asian green mussel Perna viridis is an invasive Indo-Pacific species recently reported from South African harbours. To verify the invasion, a phylogenetic (and morphological) analysis of green-shelled mussels (n = 39), found in six South African harbours, was conducted... -
From killer to carer: steroid hormones and paternal behaviour
Item type: Journal Article • Journal: African Zoology • Authors: Ruan de Bruin --- Mammalian Cognition Research Group, Department of Zoology and Entomology, South Africa Andre Ganswindt --- Department of Anatomy and Physiology, Faculty of Veterinary Science, South Africa Aliza le Roux --- Mammalian Cognition Research Group, Department of Zoology and Entomology, South AfricaMammalian parental investment (i.e. care of descendant offspring) is largely biased towards maternal contributions due to the specific feeding needs of mammalian offspring; however, varying degrees of paternal investment have been reported in about 10% of all mammalian species. Within... -
Stress steroid levels and the short-term impact of routine dehorning in female southern white rhinoceroses (Ceratotherium simum simum)
Item type: Journal Article • Journal: African Zoology • Authors: Marcha Badenhorst --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South Africa Michelle Otto --- Buffalo Dream Ranch Wildlife Veterinary Services, South Africa Annemieke C van der Goot --- Lapalala Wilderness, South Africa André Ganswindt --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South AfricaRhinoceros populations in Africa are under severe threat as a result of surging poaching rates and risk-mitigation strategies are continuously adapted in an attempt to ensure the survival of the species. This study compared faecal glucocorticoid metabolite (fGCM) levels of... -
Molecular identification of polydorid polychaetes (Annelida: Spionidae): is there a quick way to identify pest and alien species?
Item type: Journal Article • Journal: African Zoology • Authors: Lee-Gavin Williams --- Department of Botany and Zoology, South Africa Stephen A Karl --- University of Hawai‘i at Mānoa, Hawai‘i Institute of Marine Biology, USA Stanley Rice --- Department of Biology, USA Carol Simon --- Department of Botany and Zoology, South AfricaThe early detection and correct identification of polydorid polychaete species is essential as they are often encountered as invasive alien pests in aquaculture facilities or the intertidal where they may modify the ecosystem. Accurate identification is, however, often hampered by... -
Significant genetic differentiation among meroplanktonic barrel jellyfish Rhizostoma pulmo (Cnidaria: Scyphozoa) in the Mediterranean Sea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AR Ben Faleh --- Marine Biology Unit, Faculty of Sciences of Tunis, Tunisia H Allaya --- Marine Biology Unit, Faculty of Sciences of Tunis, Tunisia A Armani --- FishLab, Department of Veterinary Sciences, Italy AAB Shahin --- Department of Zoology, Faculty of Science, EgyptMolecular data have shown that jellyfishes are more geographically restricted and evolutionarily divergent than previously thought. We examined genetic variation and divergence within the meroplanktonic barrel jellyfish Rhizostoma pulmo in the Mediterranean Sea; specific sampling areas were the northern Adriatic,... -
Secondary Nothofagus dombeyi forests: site index curves and dominant height in the Coastal Range of south-central Chile
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Carlos Esse --- Escuela de Ciencias Ambientales, Nucleo de Estudios Ambientales, Chile Pablo J Donoso --- Instituto de Bosques y Sociedad, Facultad de Ciencias Forestales y Recursos Naturales, Universidad Austral de Chile, Chile Victor Gerding --- Instituto de Bosques y Sociedad, Facultad de Ciencias Forestales y Recursos Naturales, Universidad Austral de Chile, Chile Francisco Encina-Montoya --- Escuela de Ciencias Ambientales, Nucleo de Estudios Ambientales, Chile Celso Navarro --- Escuela de Ciencias Ambientales, Nucleo de Estudios Ambientales, ChileNothofagus dombeyi is distributed on very diverse sites in the temperate forests of Chile and Argentina. In Chile, studies on its dynamics and productivity in forests, where it is the dominant species, have been carried out mainly in the foothills... -
Record of Blue tilapia Oreochromis aureus (Steindachner, 1864) in the Eerste River catchment, Western Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- South African Institute for Aquatic Biodiversity, South Africa G Gouws --- South African Institute for Aquatic Biodiversity, South Africa S Avlijas --- Redpath Museum, Canada D Khosa --- South African Institute for Aquatic Biodiversity, South Africa ND Impson --- Scientific Services, South Africa M van der Westhuizen --- Conservation Services, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity, South AfricaOreochromis aureus was imported from Israel into South Africa in 1959 but data on its current status in South Africa are lacking. Genomic DNA was extracted and the COI gene amplified at the South African Institute for Aquatic Biodiversity. The... -
Non-invasive assessment of adrenocortical activity as a measure of stress in leopards Panthera pardus
Item type: Journal Article • Journal: African Zoology • Authors: Andrea B Webster --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South Africa Richard EJ Burroughs --- Department of Production Animal Studies. Faculty of Veterinary Science, South Africa Peter Laver --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South Africa André Ganswindt --- Endocrine Research Laboratory, Department of Anatomy and Physiology, South AfricaLeopards Panthera pardus are classified in the IUCN Red List as Vulnerable, primarily due to habitat loss, natural prey base depletion and exploitation caused by various anthropogenic activities. Although protected areas are important for leopard conservation, the majority of suitable... -
Stock prices and dividends: A South African perspective
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Ailie Charteris --- Finance and Tax, South Africa Kudakwashe J. Chipunza --- Postgraduate student, Graduate School of Economic and Management Sciences, South AfricaThe present value model (PVM) is considered a cornerstone of financial theory and practice, yet the limited empirical tests thereof have produced varying results depending on the method used. In addition, these tests have focused principally on developed countries, with... -
The influence of host dispersal on the gene flow and genetic diversity of generalist and specialist ectoparasites
Item type: Journal Article • Journal: African Zoology • Authors: Conrad A Matthee --- , South AfricaThe dispersal and subsequent gene flow within parasite species is the result of a complex interaction between parasite life history, host life history and abiotic environmental factors. To gain more insights into the drivers responsible for parasite dispersal, COI mtDNA... -
Tarantulas (Araneae: Theraphosidae) in the pet trade in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Tinyiko C Shivambu --- , South Africa Ndivhuwo Shivambu --- , South Africa Robin Lyle --- , South Africa Adriaana Jacobs --- , South Africa Sabrina Kumschick --- , South Africa Stefan H Foord --- , South Africa Mark P Robertson --- , South AfricaMany alien species have been introduced around the world as part of the pet trade, and some have escaped captivity and become invasive. In South Africa, many species of tarantula (Theraphosidae) are kept as pets. It is not known which... -
Strengthening the DNA barcode reference library for South African estuarine macrofauna
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Fagg --- , South Africa NL Phair --- , South Africa L Claassens --- , South Africa RSK Barnes --- , South Africa S von der Heyden --- , South AfricaSeagrass ecosystems face many anthropogenic pressures, yet globally there is a lack of knowledge of their associated biodiversity. Molecular barcoding can aid in biomonitoring efforts, but few South African invertebrates are accounted for. We provide 48 new sequences for 15... -
Hot and bothered: alterations in faecal glucocorticoid metabolite concentrations of the sungazer lizard, Smaug giganteus, in response to an increase in environmental temperature
Item type: Journal Article • Journal: African Zoology • Authors: J Scheun --- , South Africa R Campbell --- , South Africa A Ganswindt --- , South Africa T McIntyre --- , South AfricaDespite the commonly held belief that reptiles are immune to extreme temperatures, global warming is predicted to result in the loss of 40% of all reptile species by 2080. In order to understand the effects of elevated temperature on African... -
Application of DNA mini-barcoding reveals illegal trade in endangered shark products in southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TA Asbury --- , South Africa R Bennett --- , United States AS Price --- , South Africa C da Silva --- , South Africa M Bürgener --- , South Africa JD Klein --- , South Africa SN Maduna --- , South Africa N Sidat --- , Mozambique S Fernando --- , Mozambique AE Bester-van der Merwe --- , South AfricaIn recent decades, a combination of increasing demand and economic globalisation has created a global market for elasmobranch products, especially the highly prized shark fins for Asian markets. Morphological species identification, as well as traditional cytochrome c oxidase subunit I... -
Portfolio diversification with cryptocurrencies – Evidence from Middle Eastern stock markets
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Sunitha Kumaran --- , Kingdom of Saudi ArabiaThe appealing features of cryptocurrency in the digital money sector have put them into the category of investable assets. Investment professionals have begun to consider their investability and diversification benefits. It is vital for investors to understand the return-risk behaviour... -
Impacts and trapping of ambrosia beetles Euwallacea fornicatus and E. similis in Acacia plantations in Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Tran Xuan Hung --- Vietnamese Academy of Forest Sciences, Vietnam Pham Quang Thu --- Vietnamese Academy of Forest Sciences, Vietnam Nguyen Minh Chi --- Vietnamese Academy of Forest Sciences, Vietnam Le Van Binh --- Vietnamese Academy of Forest Sciences, Vietnam Bernard Dell --- Vietnamese Academy of Forest Sciences, VietnamThere are over two million hectares of Acacia plantations in Vietnam and loss from infestations of ambrosia beetles is of increasing concern. In this study, we first determined the key taxa and the extent of damage, and then identified effective... -
The role of oil price in determining the relationship between cryptocurrencies and non-fungible assets
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Omar Bani-Khalaf --- Rauf Denktas University, Nigar Taspinar --- Eastern Mediterranean University,This study aimed to explain the relationship between bitcoin and nonfungible tokens (NFTs) to determine if the NFT is an alternative investment to bitcoin or a complement during oil price uncertainty. The results showed a comovement between NFT and bitcoin... -
Eliahou number, Wilf function and concentration of a numerical semigroup
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Patricio Almirón --- Universidad Complutense de Madrid, Spain Julio José Moyano-Fernández --- Departamento de Matemáticas & Institut Universitari de Matemátiques i Aplicacions de Castelló, SpainWe give an estimate of the minimal positive value of the Wilf function of a numerical semigroup in terms of its concentration. We describe necessary conditions for a numerical semigroup to have a negative Eliahou number in terms of its... -
Species delimitation and molecular phylogeny of the grasshopper subfamily Gomphocerinae (Orthoptera: Acrididae) from Algeria based on mitochondrial and nuclear DNA markers
Item type: Journal Article • Journal: African Zoology • Authors: --- University of Biskra, Algeria --- University of Biskra, Algeria --- Henan University of Urban Construction, China --- Shaanxi Normal University, People’s Republic of ChinaGomphocerinae grasshoppers (Orthoptera: Acrididae) are generally characterised by their polymorphism and cryptic diversity, which can be confusing when relying on morphological identification alone. DNA taxonomy serves as a powerful molecular tool for species identification and biodiversity assessment. In the context... -
The status of COI and 12S rRNA DNA barcode reference libraries for freshwater fish in South Africa: Implications for future eDNA projects
Item type: Journal Article • Journal: African Zoology • Authors: --- University of KwaZulu-Natal, South Africa --- University of KwaZulu-Natal, South Africa --- University of KwaZulu-Natal, South Africa --- University of KwaZulu-Natal, South AfricaEnvironmental DNA metabarcoding (eDNA) is a rapidly emerging field in which high-throughput sequencing is used to catalogue the biodiversity of ecosystems through the amplification of DNA extracted from environmental samples (water, air, faeces and soil). Although eDNA has strong links... -
Assessment of factors driving cryptocurrency investment decision in Africa: A case of Bitcoin in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Ibrahim Abiodun Oladapo --- Imam Abdulrahman Bin Faisal University, Saudi ArabiaThis study aims to examine the factors that influence Nigerian investors decision to participate in the Bitcoin market. The study develops a model that integrates awareness, religious beliefs, and trust alongside the theory of reasoned action’s key explanatory factor. A... -
Insights into the phylogenetic position of genus Synodontella (Monopisthocotylea) among some other Dactylogyridea gill parasites of African catfishes and the importance of haptoral elements
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Jonathan A Mbondo --- Institute of Agricultural Research for Development (IRAD), Mbalmayo Agricultural Research Centre, Cameroon Dieu ne dort Bahanak --- Institute of Agricultural Research for Development (IRAD), Minko Multipurpose Research Station, Cameroon Etienne D Bassock Bayiha --- University of Yaoundé I, Cameroon Charles F Bilong Bilong --- University of Yaoundé I, CameroonThis work provides new molecular data on seven species representing three genera (Protoancylodiscoides, Schilbetrema and Synodontella) in the order Dactylogyridea. The results help to explain the origin of Synodontella spp. and to elucidate the phylogenetic position of Synodontella in relation... -
Redescription of Arabella iricolor (Montagu, 1804) with descriptions of two new species from the United Kingdom and South Africa
Item type: Journal Article • Journal: African Zoology • Authors: T Darbyshire --- , Wales, United Kingdom J Kara --- Cape Peninsula University of Technology, South AfricaArabella iricolor (Montagu, 1804) was described with no diagnostic information for the characters used today to distinguish species within the genus. An updated description, together with genetic data, is provided using the holotype in conjunction with additional specimens collected at... -
Lumbrineris magalhaensis Kinberg, 1865 (Annelida: Lumbrineridae) revealed as two indigenous species in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Adri van Niekerk --- Stellenbosch University, South Africa Jyothi Kara --- Iziko South African Museum, South Africa Arturo Alvarez-Aguilar --- Stellenbosch University, South Africa Carol A Simon --- Stellenbosch University, South AfricaLumbrineris magalhaensis Kinberg, 1865 (Annelida: Lumbrineridae) is a marine polychaete worm that was first described from the Magellan Strait, Chile; thereafter it was also reported in sub-Antarctic, temperate and tropical regions, where it was likely misidentified. In South African waters,... -
Gender preferences in cryptocurrency systems: Sentiment analysis and predictive modelling
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Samer Muthana Sarsam --- School of Management, Coventry University, UK Ahmed Ibrahim Alzahrani --- Community College, King Saud University, Saudi Arabia Hosam Al-Samarraie --- School of Design, University of Leeds, UK Fahad Alblehai --- Community College, King Saud University, Saudi ArabiaThis study explored the role of gender preferences in cryptocurrency investments using sentiment analysis. X (Twitter) users’ gender (male/female) together with relevant sentiments (positive/negative) were extracted and investigated in this study. The Latent Dirichlet Allocation technique was utilised to model... -
How does investor sentiment affect the Korean premium in the Bitcoin market?
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Joon Chae --- Seoul National University, Republic of Korea Kyounghun Bae --- Hanyang University, Republic of Korea Hyoung-Goo Kang --- Hanyang University, Republic of Korea Bonha Koo --- Chungnam National University, Republic of KoreaWe examine how investor emotions and Bitcoin price influence each other using intraday data and textual analysis. We extract emotions from a popular online chatting window at one of the largest cryptocurrency exchanges in Korea. To control for global factors,... -
Arbitrage opportunities in no-arbitrage portfolios: The case of Bitcoin and Treasury Bills
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Wing-Keung Wong --- Asia University, Taiwan Zhenzhen Zhu --- School of Statistics and Mathematics, Shandong University of Finance and Economics, China I-Ming Jiang --- College of Management, Yuan Ze University, Taiwan Elie Bouri --- Lebanese American University, LebanonEmploying both mean-variance portfolio optimization and stochastic dominance analysis, we examine whether including Bitcoin and 3-month US Treasury Bills could generate arbitrage opportunities and lead to better investment choices. The results show, independent of whether short sales are allowed, that:... -
Drivers of timber supply in an archetypical African economy, Cameroon: some policy implications for sustainable development
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ernest L Molua --- University of Buea, CameroonTimber features as an important commodity in the trade portfolio of some African countries as it is accessible, lucrative, and necessary for construction and development. For these reasons, the supply of timber has implications for sustainable development. This research evaluated...