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The Wood Properties and Qualities of Three South African-Grown Eucalypt Hybrids
Item type: Journal Article • Journal: South African Forestry Journal • Authors: F.S. Malan --- Division of Forest Science and Technology,Hybridisation is becoming an increasingly important technique in tree breeding to improve yields, adaptability and wood quality. In this study, sample material from crosses of Eucalyptus grandis with E. tereticornis, E. camaldulensis and E. urophylla established on sites of which... -
Resistance of South African maize hybrids to maize streak virus
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G. D.J. van Rensburg --- , Republic of South Africa J.H. Giliomee --- Department of Entomology and Nematology, Republic of South Africa K.L. Pringle --- Department of Entomology and Nematology, Republic of South AfricaData from maize cultivar trials at Vaalharts over a five-year period were used to evaluate the level of resistance to maize streak virus (MSV) in commercial maize hybrids, and to determine the potential value of such resistance. Maize hybrids presently... -
Identification of leaf rust resistance genes in Triticum species for transfer to common wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.I. Antonov --- Department of Genetics, Republic of South Africa G.F. Marais --- Department of Genetics, Republic of South AfricaA total of 877 Triticum accessions (27 species) were screened for resistance to leaf rust (Puccinia recondita f. sp. tritici) using mixed inoculum of pathotypes UVPrt2, UVPrt3, UVPrt8, UVPrt9 and UVPrt13. Of these, 206 accessions were resistant/moderately resistant to all... -
Susceptibility of maize hybrids to grey leaf spot under two tillage systems in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. M.J. Ward --- , South Africa D.C. Nowell --- , South Africa M.D. Laing --- Department of Plant Pathology, South Africa M.I. Whitwell --- , South AfricaGrey leaf spot (Cercospora zeae-maydis Tehon and E.Y. Daniels) has seriously decreased the yields of maize in KwaZulu-Natal, South Africa, and has been identified in neighbouring provinces and countries. Since no commercially grown hybrids have been identified to be resistant... -
Resistance of sorghum hybrids to ergot caused by Claviceps africana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.W. McLaren --- , Republic of South AfricaThirty-one sorghum hybrids were evaluated for ergot ‘escape’ resistance at Bethlehem and Potcherstroom during the 1996/97 and 1997/98 seasons. Trials were designed so that flowering and artificial inoculation occurred over a range of flowering dates and thus, ergot potentials Non-linear... -
Identification of Thinopyrum distichum chromosomes responsible for its salt tolerance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.F. Marais --- Department of Genetics, South Africa A.S. Marais --- Department of Genetics, South AfricaA Thinopyrum distichuml 4x rye (Secale cereale) hybrid with genomes J1 dJ2 dRR was pollinated with diploid rye and mostly yielded F1 offspring with 21 chromosomes (two complete rye genomes and seven Thinopyrum chromosomes). Apparently, the closely related homoeologous chromosomes... -
Transfer of rust resistance genes from Triticum species to common wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.F. Marais --- Department of Genetics, South Africa Z.A. Pretorius --- Department of Plant Sciences, South Africa A.S. Marais --- Department of Genetics, South Africa C.R. Wellings --- , AustraliaA programme aiming to transfer leaf rust resistance genes identified in a collection of wild Triticum species was initiated in 1993. In 2000, 25 promising backcross populations were available, 19 of which bred true for resistance. Seedlings of the above... -
Development of SCAR markers for a Thinopyrum distichum chromosome that appears to be involved in salt tolerance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.A. Jacobs --- Department of Genetics, South Africa L. Hanekom --- Department of Genetics, South Africa A.S. Marais --- Department of Genetics, South Africa G.F. Marais --- Department of Genetics, South AfricaSixty-seven F-1 plants from the backcross: Thinopyrum distichum/tetraploid ‘Henoch’ rye//diploid ‘Henoch’ rye were cloned, tested for salt tolerance (2–4 replications per genotype) and ranked. Sixty RAPD primers were tested on the parental lines. Nine of these produced Thinopyrum specific fragments... -
Additive mean effects and multiplicative interaction analysis of maize yield trials in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S. H. Ma’ali --- , South AfricaThirty five maize hybrids were evaluated over 98 environments for genotype x environment interaction (GEI) and yield stability under dry land conditions during the 2003 to 2006 seasons in the eastern and western maize production regions of South Africa. The... -
Advances in sugarcane soil fertility research in Southern Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.H. Meyer --- , R. van Antwerpen --- ,The South African sugar industry is a modern, well organised industry and highly cost-competitive in world terms, producing some 2.3 million tons of sugar annually from 20 million tons of cane. The bulk of the cane is produced by some... -
Targeting of early to intermediate maize hybrids for yield performanceand yield stability using SREG model
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Setimela --- , Zimbabwe J. Crossa --- CIMMYT Km, D.F Mexico M. Bänziger --- CIMMYT Km, D.F MexicoThe effectiveness of targeting and predicting maize (Zea mays.L) hybrid performance is difficult when the magnitude of genotype x environment (GE) interaction and yield prediction cannot be interpreted and is only based on genotypes (G) and GE means. The traditional... -
Early establishment performance of local and hybrid maize under two water stress regimes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T. Mabhaudhi --- , Pietermaritzburg A.T. Modi --- , PietermaritzburgMaize (Zea mays L.) is the major grain crop in South Africa where most subsistence farmers still plant landraces. The objective of this study was to compare two landrace selections of maize with two hybrids popular among small-scale farmers in... -
Host suitability of selected South African maize genotypes to the root-knot nematode species Meloidogyne incognita race 2 and Meloidogyne javanica: A preliminary study
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.L. Ngobeni --- , South Africa H. Fourie --- , South Africa A.H. Mc Donald --- , South Africa P.W. Mashela --- , South AfricaThirty-one commercial maize (Zea mays L.) hybrids and open-pollinated varieties (OPV’s) were screened in separate greenhouse trials with a resistant inbred line MP712W as reference genotype for host suitability to Mel-oidogyne incognita race 2 and Meloidogyne javanica. Approximately 10 000... -
Maize–planting date interaction and effect of Bt maize on European corn borer (Ostrinia nubilalis (Hubner) (Coleoptera: Crambidae) damage
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M Obopile --- Department of Entomology, Ohio Agricultural Research and Development Center, USA RB Hammond --- Department of Entomology, Ohio Agricultural Research and Development Center, USA PR Thomison --- Department of Horticulture and Crop Science, USAA study was conducted to determine the influence of planting date and transgenic maize on maize yield following stalk injury by European corn borer, Ostrinia nubilalis (Hubner). Transgenic and non-transgenic maize hybrids with short- and full-season maturity were planted in... -
Evaluation of electrical conductivity of the fertiliser solution on growth and flowering of a Cymbidium hybrid
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: SK Naik --- , India D Barman --- , India Rampal --- , India RP Medhi --- , IndiaThe effects of three fertiliser solutions (20:20:20, 15:5:25 and 12:30:10 NPK) with electrical conductivity (EC) of 1, 1.5 or 2 mS cm−1 on growth and flowering of Cymbidium ‘Sleeping Nymph’ were investigated over three years. One-year-old tissue-cultured propagules of ‘Sleeping... -
A Comparison of the kraft pulp properties of P. elliottii and the P. elliottii x P. caribaea var. hondurensis hybrid grown in Queensland, Australia
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: T.K. Stanger --- Shaw Research Centre, South Africa M. J.P. Shaw --- Shaw Research Centre, South Africa R. Braunstein --- , South Africa D.G. Nikles --- , AustraliaThe interspecific hybrid between P. elliottii var. elliottii and P. caribaea var. hondurensis has recently been accepted for planting operationally as an alternative to P. elliottii by Sappi in South Africa. Some concerns have been expressed as to the suitability... -
Comparative analysis of the aquaculture potential of hybrid Tilapia zillii (male) × T. guineensis (female) (Teleostei: Cichlidae) in floating cages, cement tanks and earth ponds
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CélineSK Nobah Tidiani Koné Valentin N'Douba Jos Snoeks Gouli Gooré Bi EssetchiP KouamélanThe effect of three rearing systems, floating cages, cement tanks and earth ponds, on the growth rate, feeding efficiency and mortality rates of hybrid tilapia — Tilapia zillii (male) × T. guineensis (female) — was evaluated for 233 days. Fish... -
Phenotypic characterisation in interspecific and intergeneric hybrids of the clariid catfishes Heterobranchus longifilis, Clarias gariepinus and Clarias anguillaris in Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AA Akinwande --- Department of Fisheries Technology, Nigeria OA Fagbenro --- Department of Fisheries and Aquaculture, Nigeria OT Adebayo --- Department of Fisheries and Aquaculture, NigeriaThirty-nine morphometric and five meristic comparisons were carried out on 12-month-old interspecific and intergeneric hybrids of the African clariid catfishes Heterobranchus longifilis, Clarias gariepinus and Clarias anguillaris from experimental earthen ponds in Nigeria. Canonical discriminant analysis accounted for 89.4% of... -
Hybridisation between the Common Buzzard Buteo buteo buteo and the North African race of Long-legged Buzzard Buteo rufinus cirtensis in the Strait of Gibraltar: prelude or preclude to colonisation?
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Javier Elorriaga --- , Spain Antonio-Román Muñoz --- , SpainNatural hybridisation in Old World buzzards (Buteo) is an uncommon phenomenon with important ecological implications. This genus constitutes an intricate radiation of genetically poorly differentiated raptors whose taxonomic classification is a frequent subject of debate. We report the first case... -
Nile tilapia invades the Lake Malawi catchment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Genner --- School of Biological Sciences, UK E Connell --- School of Biological Sciences, UK A Shechonge --- School of Biological Sciences, UK A Smith --- Department of Biological Sciences, UK J Swanstrom --- School of Biological Sciences, UK S Mzighani --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania A Mwijage --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania BP Ngatunga --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania GF Turner --- School of Biological Sciences, UKThe Lake Malawi/Nyasa catchment contains over 835 endemic cichlid fish species. This unique biodiversity has made it widely recognised as one of the world's most significant freshwater ecosystems. Here we report the first occurrence records of two invasive tilapiines, Oreochromis... -
Fibre optic microarrays for the detection and enumeration of harmful algal bloom species
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DM Anderson D Kulis D Erdner S Ahn D WaltHarmful algal blooms (HABs) are a serious threat to coastal resources, causing impacts ranging from the contamination of seafood products with potent toxins to mortalities of wild and farmed fish and other marine animals. As the threat from HABs has... -
Enhanced detection levels in a semi-automated sandwich hybridisation assay using a peptide nucleic acid (PNA) signal probe
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Connell J Ray W Litaker P TesterA peptide nucleic acid (PNA) signal probe was tested as a replacement for a typical DNA oligonucleotide-based signal probe in a semi-automated sandwich hybridisation assay designed to detect the harmful phytoplankton species Alexandrium tamarense. The PNA probe yielded consistently higher... -
Evidence of hybridisation within the genus Chrysoblephus and conserved nuclear sequences of South African sparids (Teleostei: Sparidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S von der Heyden --- Evolutionary Genomics Group, Department of Botany and Zoology, South Africa A Connell --- , South AfricaSeveral hybridisation events have been recorded in marine fish, yet there is little information for southern African species. Here we present evidence for hybridisation within the genus Chrysoblephus (Sparidae), by analysing a fish caught off KwaZulu-Natal, off the east coast... -
High-latitude connectivity of the scleractinian coral Acropora tenuis in the south-western Indian Ocean, identified using nuclear intron and mitochondrial sequence data
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B Chiazzari --- School of Life Sciences, South Africa A Macdonald --- School of Life Sciences, South Africa M Schleyer --- , South AfricaAll scleractinian corals in southern Africa occupy the high-latitude margins of their biogeographical range, with some straddling multiple biogeographical regions. Connectivity among these populations is essential to maintain genetic diversity, and thus their conservation value. Therefore, the aim of this... -
Prospects of eucalypt species, including interspecific hybrids from South Africa, for hardwood plantations in marginal subtropical environments in Queensland, Australia
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: D J Lee --- , D G Nikles --- , G R Dickinson --- ,In Australia, there has been rapid expansion in recent years of commercial plantations of hardwood timber species, especially of Eucalyptus and Corymbia. In tropical and sub-tropical Queensland the land most likely to be readily available for this planting is in... -
Interspecific hybrids in Zimbabwe: status review and future challenges
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: D.P. Gwaze --- , USASeveral F1 eucalypt and pine interspecific hybrids have been tested in Zimbabwe. The first hybrids tests were of pine species, and these were established in 1973. The results from these early tests were not spectacular and interest in hybrids was... -
Yield Potential of selected Eucalyptus genetic stock on the sandy soils of the South African Cape West Coast
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: G. van Wyk --- Department of Forest Science, Faculty of Agricultural and Forestry Sciences, Republic ofSouth Africa A. van Laar --- Department of Forest Science, Faculty of Agricultural and Forestry Sciences, Republic ofSouth Africa J.M. Theron --- Department of Forest Science, Faculty of Agricultural and Forestry Sciences, Republic ofSouth AfricaLand available for afforestation in the Western Cape Region has largely been subordinate to agriculture. Eucalypt species have never been tested intensively along the West Coast. Climatic matching suggests planting of species from West Australia as native habitat introductions, or... -
Harvesting genetics for productive plantations
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: S.D. Verryn --- Tree Improvement Business Area, Environmentek CSIR,Tree breeding has had significant impacts on the success of the South Mrica forest industry. Examples are cited for tree growth rate, where for instance, a mean genetic improvement of39% has been measured in F2 E.grandis over unimproved controls over... -
“New” pine species and hybrids: Is there still potential?
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Eric Kietzka --- Mondi Forests, Republic of South AfricaMany tree breeding programs are moving into advanced generation breeding, and breeders need to ensure continued gains from these programs. The potential of infusing genetic material into existing breeding programs, the introduction of “new” species, and hybridisation are discussed as... -
Early selection of Eucalyptus clones in retrospective nursery test using growth, morphological and dry matter criteria, in Republic of Congo
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Jean-Marc Bouvet --- , France Philippe Vigneron --- , France Rachel-Aubain Saya --- , République du Congo Raphaël Gouma --- , République du CongoWithin the framework of the eucalyptus breeding programme in the Congo, two retrospective tests were conducted using mature clones in the field and young cuttings under nursery conditions with two hybrids: 13 clones of Eucalyptus tereticornis* Eucalyptus grandis for the... -
Final results from a trial to test the effect of plot size on Eucalyptus hybrid clonal ranking in coastal Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: TK Stanger --- , South Africa GM Galloway --- Shaw Research Centre, South Africa ECL Retief --- Shaw Research Centre, South AfricaHybrid clones with Eucalyptus grandis as one parent and, generally, E. urophylla as the other parent, are deployed commercially as monoclonal blocks by Sappi in the subtropical region of coastal Zululand, South Africa. In monoclonal blocks genotypes are grown in... -
Performance of two Pinus patula hybrids in southern Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: A Kanzler --- Sappi Forest Research, South Africa K Payn --- , South Africa A Nel --- Sappi Forest Research, South AfricaTwo Pinus patula hybrids, P. greggii × P. patula and P. patula × P. tecunumanii, were planted across a number of sites in southern Africa. The growth and survival for each species/taxon was assessed at either 5 or 8 years... -
Stomatal characteristics of Eucalyptus grandis clonal hybrids in response to water stress
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: AlanaB Eksteen --- School of Life Sciences, South Africa Valerie Grzeskowiak --- Sappi Forests, South Africa NickyB Jones --- Sappi Forests, South Africa NormanW Pammenter --- School of Life Sciences, South AfricaThis study describes the stomatal response occurring during water stress and subsequent recovery of three Eucalyptus grandis clonal hybrids. The aim was to investigate the degree to which stomatal conductance (g s) and stomatal density differ between the clonal hybrids... -
Does Serranochromis altus (Teleostei: Cichlidae) exist in the Okavango Delta, Botswana?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FH van der Bank M Wink M Soekoe N SmitTwo possibly synonymous fish species in the Okavango Delta, Botswana, Serranochromis altus and S. angusticeps, were compared. Ecological data, morphometrics, meristics, allozymes, and genomic fingerprints — generated with six Inter-Simple Sequence Repeat (ISSR) analyses, and DNA barcoding primers — were... -
Genetic control of wood density and bark thickness, and their correlations with diameter, in pure and hybrid populations of Eucalyptus grandis and E. urophylla in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: ECL Retief TK StangerTree diameter under and over bark at breast height (dbh), wood density and bark thickness were assessed on samples from control-pollinated families of Eucalyptus grandis, E. urophylla, E. grandis × E. urophylla and E. urophylla × E. grandis. The material... -
Genetic parameters of pure and hybrid populations of Eucalyptus grandis and E. urophylla and implications for hybrid breeding strategy
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: ECL Retief TK StangerIn order to review Sappi Forests' breeding strategy for E. urophylla × E. grandis hybrids, information is required regarding the genetic control of certain traits and the correlations between them. A hybrid seedling progeny trial was planted, comprising material generated... -
Genetic diversity of maize germplasm lines and implications for breeding Maize streak virus resistant hybrids
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nothando Mafu --- Plant Pathology, School of Agricultural, Earth and Environmental Sciences, South Africa Roobavathie Naidoo --- Plant Pathology, School of Agricultural, Earth and Environmental Sciences, South Africa Pedro Fato --- African Centre of Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa Jedidah Danson --- African Centre of Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa John Derera --- African Centre of Crop Improvement, School of Agricultural, Earth and Environmental Sciences, South Africa Mark D Laing --- Plant Pathology, School of Agricultural, Earth and Environmental Sciences, South AfricaEvaluation of genetic distances between maize inbred lines can be used to maximise heterosis in hybrids. This study was conducted to determine genetic distances among 25 maize inbred lines in the Maize streak virus disease (MSVD) QTL region to develop... -
The hybrid mean value of L-functions and a special character sums
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jianghua Li --- College of Science, P.R. China Xinqiang Qin --- College of Science, P.R. China Fang Zhang --- College of Science, P.R. ChinaThe main purpose of this paper is using the estimation of the character sums to study the 2k-th power mean of L-functions with the weight of a character sums, and give an interesting asymptotic formula for it. -
Breeding polyploid varieties of tropical acacias: progress and prospects
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: A Rod Griffin --- School of Biological Sciences, Australia Nghiem Quynh Chi --- Institute for Forest Tree Improvement and Biotechnology, Vietnam Jane L Harbard --- School of Biological Sciences, Australia Do Huu Son --- Institute for Forest Tree Improvement and Biotechnology, Vietnam Christopher E Harwood --- School of Biological Sciences, Australia Aina Price --- School of Biological Sciences, Australia Tran Duc Vuong --- Institute for Forest Tree Improvement and Biotechnology, Vietnam Anthony Koutoulis --- School of Biological Sciences, Australia Ha Huy Thinh --- Institute for Forest Tree Improvement and Biotechnology, VietnamThe paper reviews a decade of progress with breeding new polyploid varieties of Acacia mangium and other tropical acacias in Vietnam, and outlines plans for future strategies to complement conventional diploid breeding. Polyploid breeding is a means of introducing diversity... -
Exclusivity, hybridity and community: negotiating place, ethnicity and South African realities
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Michael de Jongh --- Department of Anthropology and Archaeology,Living on a tract of land in the Soutpansberg allocated to them in 1888 by President Paul Kruger for ‘services rendered’ to the erstwhile Transvaal Republic (Zuid-Afrikaansche Republiek), is the hybrid and largely exclusive Buys community. As descendants of Jean... -
A comparison of planting and coppice regeneration of Eucalyptus grandis × Eucalyptus urophylla clones in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jacob W Crous --- Sappi Forests, South Africa Louisa Burger --- Department of Forest and Wood Science, South AfricaResults from two coppice compared to replant trials are presented that originated from clone by site interaction (CSI) trials established on high‑ and low‑productivity sites in subtropical coastal KwaZulu‑Natal, South Africa. After the 84‑month CSI trial measurements were completed the... -
Phylogenetic tests of a Cercopithecus monkey hybrid reveal X-chromosomal polyphyly of C. cephus and emerging patterns in the cephus species group radiation
Item type: Journal Article • Journal: African Zoology • Authors: Anthony J Tosi --- Department of Anthropology, USAA captive Cercopithecus nictitans × C. cephus male was examined at loci on the X- and Y-chromosomes as a test of previously described phylogenetic methods for identifying hybrid Cercopithecus monkeys. The results confirm the reliability of such assays, indicating that... -
Growth and dynamic modulus of elasticity of Pinus patula × Pinus tecunumanii hybrids in Mpumalanga, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Phillip C Hongwane --- Komatiland Forests Research, South Africa R Glen Mitchell --- Forest Solutions Malaysia, Malaysia Arnulf Kanzler --- Sappi Forest Research, South Africa Steven D Verryn --- Creation Breeding Innovations, South Africa Paxie WC Chirwa --- Department of Plant and Soil Sciences, South AfricaField establishment of South Africa’s most important commercial pine species, Pinus patula, is severely hampered by the pitch canker fungus, Fusarium circinatum. Importantly, hybrids between P. patula and other pine species tolerant to the pitch canker fungus, such as P... -
Two cases of probable hybridisation between the pufferfishes Arothron meleagris (Anonymous 1798) and A. nigropunctatus (Bloch and Schneider 1801) on a fringing reef at Réunion Island
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Bourjon --- Les Sentinelles du Récif, réseau d’observateurs volontaires de la Réserve Naturelle Marine de La Réunion [‘Sentinels of the Reef’, Volunteer Observers Network of the Réunion Marine Park] (GIP–RNMR), Réunion Island B Chanet --- Institut de Systématique, FranceTwo individuals displaying mixed features of the colour patterns distinctive of Arothron meleagris and A. nigropunctatus were observed on the fringing reef at Réunion Island, between September 2012 and August 2013. Because many hybrid fish have been first identified through... -
Amaranth grain production as affected by watering regimes and day length in southern Mozambique
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jerónimo EMM Ribeiro --- Department of Agronomy, South Africa Petrus J Pieterse --- Department of Agronomy, South Africa Sebastião I Famba --- Faculty of Agronomy and Forestry Engineering, MozambiqueThe high nutritional value of amaranth grain makes it attractive for the diet of rural people living in dry semi-arid areas of southern Mozambique. A study was implemented with Amaranthus hybridus and A. tricolor in sandy soil aiming to assess... -
Realised genetic gains and estimated genetic parameters of two Eucalyptus grandis × E. urophylla hybrid breeding strategies
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Gert J van den Berg --- Mondi Forests (Pty) Ltd, South Africa Steven D Verryn --- Faculty of Natural and Agricultural Sciences, South Africa Paxie W Chirwa --- Faculty of Natural and Agricultural Sciences, South Africa Francois van Deventer --- Mondi Forests (Pty) Ltd, South AfricaConventionally, Eucalyptus grandis × E. urophylla (GU) hybrid material is first tested as seedlings in progeny trials for at least four years before ortets are selected and ramets of the selected ortets are propagated to test in clonal trials. The... -
Influence of site in the wood quality of Eucalyptus in plantations in Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Thiago Leite Barbosa --- Department of Forestry and Wood Sciences, Brazil José Tarcísio da Silva Oliveira --- Department of Forestry and Wood Sciences, Brazil Sofia Maria Gonçalves Rocha --- Department of Forestry and Wood Sciences, Brazil Ana Paula Câmara --- Department of Forestry and Wood Sciences, Brazil Graziela Baptista Vidaurre --- Department of Forestry and Wood Sciences, Brazil Antônio Marcos Rosado --- Celulose Nipo-Brasileira SA (CENIBRA), Brazil Fernando Palha Leite --- Celulose Nipo-Brasileira SA (CENIBRA), BrazilGenetic materials interact with the environment in specific ways, therefore their responses in wood need to be better understood. The present study sought to evaluate the influence of different climatic conditions in Minas Gerais, Brazil on Eucalyptus grandis × Eucalyptus... -
Frost tolerance of various Pinus pure species and hybrids
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Fanelesibonge Mabaso --- Department of Forest and Wood Science, South Africa Hannél Ham --- Department of Forest and Wood Science, South Africa André Nel --- Sappi Forests Research, Shaw Research Centre, South AfricaPinus species are widely planted by the South African forestry industry and are utilised for pulp, paper and saw timber products. Historically, Pinus patula Schiede ex Schltdl. et Cham. was the most widely planted commercial species in the summer rainfall... -
“Reproducing the social”: contradictory interconnections between land, cattle production and household relations in the Besters Land Reform Project, South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Donna Hornby --- Institute for Poverty, Land and Agrarian Studies, South Africa Ben Cousins --- Institute for Poverty, Land and Agrarian Studies, South AfricaLand redistribution policy in South Africa emphasises commercial farming as the legitimate use of land. This production-oriented framework fails to take into account the intertwined but unstable relationship between the production of market value and social reproduction, and how this... -
Assessment of genetic diversity among low-nitrogen-tolerant early generation maize inbred lines using SNP markers
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sam O Ajala --- International Institute of Tropical Agriculture, Nigeria Muyideen O Olayiwola --- International Institute of Tropical Agriculture, Nigeria Oluyinka J Ilesanmi --- International Institute of Tropical Agriculture, Nigeria Melaku Gedil --- International Institute of Tropical Agriculture, Nigeria Anthony O Job --- International Institute of Tropical Agriculture, Nigeria Amudalat B Olaniyan --- Department of Agronomy, NigeriaLow soil nitrogen (low-N) level is responsible for yield reduction in maize (Zea mays L.) fields in sub-Saharan Africa. A clear understanding of the genetic diversity among early generation inbred lines selected from various elite low-N- tolerant populations offers an... -
A genetic study of pod shattering resistance in F2 soybean (Glycine max) germplasm
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Khuliso M Nevhudzholi --- , South Africa Eastonce T Gwata --- , South Africa Godwin RA Mchau --- , South AfricaSoybean is an important food legume. Promiscuous (tropical) soybean types which are compatible with indigenous soil rhizobia are desirable in crop production systems that are limited by inorganic nitrogenous fertilizers. However, the tropical soybean types are generally susceptible to pod... -
Learners’ experience and expectations during and post COVID-19 in higher education
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Javed Suleri --- , the NetherlandsCOVID-19 has turned the tables on every part of our lives, as hardly any sector is left without a profound impact, including the higher education sector. During this pandemic, the higher education sector has been obliged to deliver education virtually... -
Investigating the wood production and adaptability potential of Corymbia hybrid progeny in northern coastal Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Robin AW Gardner --- , South Africa David J Lee --- , AustraliaDuring August 2013, two ‘new’ eucalypt taxa × site interaction trials were established in northern coastal Zululand. The main purpose of these trials was to investigate the commercial forestry potential of a range of Corymbia inter-specific hybrids for the region... -
Initial growth results comparing first generation F1 and advanced-generation F2 Pinus patula × Pinus tecunumanii interspecific hybrid families
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: André Nel --- , Juan J Acosta --- , Gary R Hodge --- ,The hybrid between Pinus patula and P. tecunumanii low elevation (PPTL) and high elevation (PPTH) sources was developed in the 1990s in South Africa and commercialised during the 2000s in response to high post-establishment mortality of P. patula caused by... -
Why and to Where does Ajany Run? Culture and Femininity in Yvonne Owuor’s Dust
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Esther K. Mbithi --- , Kenya Julia Njeri Karumba --- , KenyaLaunched around the time Kenya was marking fifty years of independence, Yvonne Owuor’s Dust has been described as a ‘cultural inheritance.’ It portrays a collection of colourful characters who laugh at themselves in their search for some sense of belonging... -
A serious shoot and leaf disease caused by Colletotrichum theobromicola discovered on eucalypts in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Myriam Solís --- , South Africa Michael J Wingfield --- , South Africa Izette Greyling --- , South Africa Nam Q Pham --- , South AfricaEucalypt plantations in South Africa make up an important part of the local forestry industry. Recently, one-year-old nursery plants of a Eucalyptus grandis × Eucalyptus urophylla variety displayed symptoms of leaf and shoot anthracnose disease. Samples were collected from these... -
Teleworking and the jobs of tomorrow
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Georges El Hajal --- , The NetherlandsTeleworking’s popularity as a flexible working arrangement has been on the rise. Today, it is a hot topic of discussion among employees and employers alike. The COVID-19 pandemic has accelerated the popularity of this trend and has convinced many that... -
Low nitrogen fertiliser rates and stage of maturity influence nitrogen fractionation and in vitro ruminal nitrogen degradability in tropical grasses
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Martin P Hughes --- , Trinidad and Tobago Victor Mlambo --- , South Africa Cicero HO Lallo --- , Trinidad and TobagoThis study evaluated the interactive effects of low rates (0, 25, 50 and 75 kg N ha−1) of nitrogen (N) fertilizer application and stage of maturity on total N, N fractions and in vitro ruminal N degradability in Brachiaria hybrid,... -
The extent of hybridisation between largemouth bass and Florida bass across two river systems in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Dumisani Khosa --- , South Africa John S Hargrove --- , South Africa Eric Peatman --- , United States Olaf LF Weyl --- , South AfricaNative to North America, largemouth bass Micropterus salmoides (Lacepède, 1802) were introduced in South Africa in 1928. Florida bass Micropterus floridanus (Lesueur, 1822) were introduced to enhance existing largemouth bass fisheries in 1980. While largemouth bass and Florida bass readily... -
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... -
Understanding the translocation dynamics of Nile tilapia (Oreochromis niloticus) and its ecological consequences in East Africa
Item type: Journal Article • Journal: African Zoology • Authors: Papius Dias Tibihika --- National Fisheries Resources Research Institute, Uganda Harald Meimberg --- Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences Vienna (BOKU), Austria Manuel Curto --- Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences Vienna (BOKU), AustriaThe Nile tilapia (Oreochromis niloticus) is the second-most economically important fish species in East African countries (EAC), surpassed only by the Nile perch (Lates niloticus). It is the most-farmed freshwater fish species in EAC and the second-most-farmed worldwide. Currently, in... -
Conservation status and threats to lovebirds: knowledge gaps and research priorities
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Sascha Dueker --- University of KwaZulu-Natal, South Africa Sandi Willows-Munro --- University of KwaZulu-Natal, South Africa Michael R Perrin --- University of KwaZulu-Natal, South Africa Yilma D Abebe --- , Ethiopia Nathaniel ND Annorbah --- University of Environment and Sustainable Development, Ghana Esther W Mwangi --- National Museums of Kenya, Kenya Ireene R Madindou --- National Museums of Kenya, Kenya Wondimagegnehu Tekalign --- Wolaita Sodo University, Ethiopia Emiliano Mori --- Istituto di Ricerca sugli Ecosistemi Terrestri, Italy Tiwonge I Mzumara --- , United Kingdom Chris Brown --- , Namibia Ursula Bryson --- , Namibia Henry Ndithia --- National Museums of Kenya, Kenya Tim Dodman --- , United Kingdom Henriette van der Zwan --- North-West University, South Africa Rencia van der Sluis --- North-West University, South Africa Chaona R Phiri --- Manchester Metropolitan University, United Kingdom Abigail Karimanzira --- , Zimbabwe Rowan O Martin --- , United KingdomLovebirds (genus Agapornis of family Psittaculidae) are a group of small, colourful parrot species endemic to sub-Saharan Africa and Madagascar, two-thirds of which are considered to have declining populations. Effective conservation efforts are hampered by a lack of information, particularly... -
Biomass production and nutritional efficiency in short rotation eucalypt clone plantations for energy in north-east Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Welluma Teixeira Barros --- State University of Southwest Bahia, Brazil Patrícia Anjos Bittencourt Barreto-Garcia --- State University of Southwest Bahia, Brazil Valdemiro da Conceição Júnior --- State University of Southwest Bahia, Brazil Marcos Gervasio Pereira --- Federal Rural University of Rio de Janeiro, Brazil Paulo Henrique Marques Monroe --- State University of Southwest Bahia, Brazil Maicon dos Santos da Silva --- São Paulo State University, Brazil Mariana dos Santos Nascimento --- State University of Southwest Bahia, Brazil Jaqueline Lima Morais --- State University of Southwest Bahia, BrazilSelecting adapted hybrids with greater efficiency in the use and return of nutrients is essential to ensure the success of forestry activities. Although topics on the nutritional sustainability of eucalypt biomass harvesting have frequently been discussed, few studies have focused... -
Quantitative genetics and breeding strategies in hybrid populations of Pinus patula × Pinus tecunumanii
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Luis Ibarra --- North Carolina State University, USA Gary Hodge --- North Carolina State University, USA Juan José Acosta --- North Carolina State University, USAForestry companies SAFCOL and Sappi conducted a study in South Africa to examine genetic variation and select improved material in full-sib hybrid families of Pinus patula × Pinus tecunumanii. The results from the study on clonal and seedling hybrid populations... -
“Feeling their way through their cultural roots”: theorising the Khoisan revivalist critique of authenticity from below
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Rafael Verbuyst --- University of Gent, BelgiumAuthenticity is a longstanding concern in Khoisan Studies. Most scholarship has examined how stereotypical, essentialist and static notions of “authentic” Khoisan identity and culture are habitually reproduced and demanded of the Khoisan for economic or political gain. Recent work instead... -
Framing HIV and AIDS in competitive authoritarian democracies. Case study of the print press in Mozambique, 1986–2020
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Araújo Domingos --- KTH Royal Institute of Technology, Sweden Nina Wormbs --- KTH Royal Institute of Technology, Sweden Urban Lundberg --- Dalarna University, SwedenMozambique has the sixth highest prevalence of HIV in the world and ranks fourth in new infections. The government-owned print press Notícias has played an important role in the social construction of HIV and AIDS in the country as it... -
Leisure futures: a hybrid approach integrating generative AI and design futures
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Marco Bevolo --- World University of Design, India Dennis Draeger --- United Kingdom and Napier, New ZealandThis article aims to establish a foundation for the vocational and applied study of the possible, probable and preferable futures of the leisure industries. It does so by presenting a novel methodological approach, integrating state-of-the-art generative AI (GenAI) created content... -
Evolution, population structure and morphology of the African Black Duck Anas sparsa and Yellow-billed Duck A. undulata
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Philip Lavretsky --- University of Texas at El Paso, United States Ramsey Russell --- , United States Sara Gonzalez --- University of Texas at El Paso, United States Vergie M Musni --- University of Texas at El Paso, United States Alexis Díaz --- Centro de Ornitología y Biodiversidad (CORBIDI), Peru Joshua I Brown --- University of Texas at El Paso, United StatesBiological conservation requires a fundamental understanding of evolutionary history and established contemporary population genetics. Here, we sequenced mitochondrial DNA (mtDNA) and thousands of nuclear loci across individuals of the African Black Duck Anas sparsa and Yellow-billed Duck A. undulata to... -
A hybrid regularization method for simultaneous inversion of source term and initial value in a time-fractional diffusion equation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jin Wen --- Northwest Normal University, P.R. China Yong-Ping Wang --- Northwest Normal University, P.R. China Li-Ming Huang --- Northwest Normal University, P.R. China Donal O’Regan --- University of Galway, IrelandThis paper considers an inverse problem to find the space-dependent source term and initial data simultaneously in a time-fractional diffusion equation. This inverse problem is usually ill-posed, that is, small errors in the measurement typically lead to large errors in... -
The genetic control of early growth properties in Pinus patula × Pinus tecunumanii hybrid families
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JP de Villiers --- Sappi Shaw Research Centre, South Africa A Nel --- Sappi Shaw Research Centre, South Africa B du Toit --- University of Stellenbosch, South AfricaThe objective of this study was to determine the genetic control of growth properties in Pinus patula × Pinus tecunumanii hybrid families across seven sites planted in the summer rainfall region of southern Africa. Genetic material included in the analyses... -
Silvicultural management strategies for climate change mitigation with the focus on plantation forests
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ben du Toit --- Stellenbosch University, South AfricaThis technical note explores several practical actions whereby short-rotation plantation forests in warm climates can be managed for increased resilience in the face of climate change. It includes landscape level issues such as ecosystem resilience, limiting the invasive tendencies of...