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Genetic Improvement of Timber Yield and Wood Quality in Eucalyptus Grandis (Hill) Maiden
Item type: Journal Article • Journal: South African Forestry Journal • Authors: G. van Wyk --- Division of Forest Science and Technology,Results of a partial diallel progeny test of Eucalyptus grandis assessed at ages 5, 36, 60 and 105 months are presented. Large genetic variations among full-sib families were found for all traits studied, e.g. the mean tree volume per family... -
Evaluating different wheat production strategies for the Orange Free State using stochastic dominance techniques and a crop growth model
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Department of Agrometeorology, Republic of South Africa J.M. de Jager --- Department of Agrometeorology, Republic of South AfricaA wheat crop growth model and stochastic dominance techniques were used to evaluate several wheat production strategies for the Orange Free State. Fifty seasonal grain yields and corresponding gross margins were calculated from daily weather data and soil data for... -
An evaluation of two collections of South African maize (Zea mays L.) germ plasm: 1. The genetic basis of the synchronization of pollen shedding and silk emergence
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B. de Jager --- Department of Genetics, C.Z. Roux --- Department of Genetics, H.C. Kühn --- ,Pollen shed-silking synchronization for a cultivar was measured by the interval between the dates on which 50% of the plants exhibited anthers and the dates on which 50% of the primary ears exhibited extruded silks. Under drought stress silking may... -
An evaluation of two collections of South African maize (Zea mays L.) germ plasm: 2. The genetic basis of dry-down rate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B. de Jager --- Department of Genetics, C.Z. Roux --- Department of Genetics, H.C. Kühn --- ,Dry-down rate is the loss of moisture from maize kernels over time. This study was undertaken to determine whether collections of early and late flowering South African germ plasm have the same genetic properties with reference to dry-down rate as... -
NOTES ON THE AVAILABILITY AND CHEMICAL COMPOSITION OF WATER FROM THE GRAVEL PLAINS OF THE NAMIB-NAUKLUFT PARK
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: O.B. Kok --- Department of Zoology, J.U. Grobbelaar --- Department of Zoology,Data are presented on the occurrence of a surprising number of permanent water sources on the gravel plains of the Namib-Naukluft Park, South West Africa. As a consequence, no game animal is further than ca 25 km away from the... -
Your Culture or Mine? Changes in Cultural Sensitivity in a Service-Learning Class
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Luzelle Naudé --- University of the Free State,This study investigated patterns of attitudinal change in students following a service-learning experience. The data for this study was collected from psychology students in their third and fourth years of study at the University of the Free State. All these... -
Spatial and temporal patterns of phytoplankton abundance and composition in three ecological zones in the Tanzanian waters of Lake Victoria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GW Ngupula --- , Tanzania ASE Mbonde --- , Tanzania CN Ezekiel --- , TanzaniaPhytoplankton abundance and composition in relation to physico-chemical parameters were investigated from September 2005 to October 2007 at 51 stations of various depths in the nearshore, intermediate and deep offshore waters of Lake Victoria. Shallow nearshore waters had the highest... -
Zooplankton composition and community structure in Lake Tiga, Kano, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Akindele --- Department of Zoology, Nigeria IF Adeniyi --- Department of Zoology, NigeriaZooplankton in Lake Tiga was identified and its community structure assessed between March 2009 and March 2011. A total of 54 species of zooplankton was recorded, comprising two species of Protozoa, 26 species of Rotifera, eight species of Copepoda, 11... -
Effects of fishing on the size and dominance structure of linefish of the Cape region, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D. Yemane J. G. Field M. H. GriffithsA dataset of linefish catch, effort and fish size distribution records has been assembled from archives to cover three short periods over the 100 years from 1897 to 1998 in four regions of the former Cape Colony, South Africa. Linefish... -
Reproductive partitioning among polyandrous alpha and beta pale chanting-goshawk males
Item type: Journal Article • Journal: African Zoology • Authors: Gerard Malan --- Percy FitzPatrick Institute, University of Cape Town, South AfricaThis study investigates the reproductive and parental roles of polyandrous male pale chanting-goshawks, Melierax canorus, and speculatively reviews the fitness outcomes of different skew and relatedness scenarios. The study was conducted over five years in the Little Karoo, South Africa... -
An assessment of behavioural dominance in a social subterranean rodent, Cryptomys hottentotus pretoriae, using the cardinal dominance index method
Item type: Journal Article • Journal: African Zoology • Authors: G. P. Malherbe --- Department of Zoology and Entomology, South Africa N. C. Bennett --- Department of Zoology and Entomology, South AfricaThe highveld mole-rat, Cryptomys hottentotus pretoriae, is a social bathyergid that exhibits a high reproductive skew and occurs in colonies of between 5 and 14 individuals. Behavioural dominance has previously been assessed in this species using an ordinal ranking procedure... -
Dominance and population structure of freshwater crabs (Potamonautes perlatus Milne Edwards)
Item type: Journal Article • Journal: South African Journal of Zoology • Authors: M.J. Somers --- Department of Zoology, University of Stellenbosch, South Africa J.A.J. Nel --- Department of Zoology, University of Stellenbosch, South AfricaAlthough freshwater crabs, Potamonautes spp, are abundant (up to 23 crabs m-2) in southern African freshwater systems and form a major part of the diet of many vertebrates, little is known about their biology. Understanding crab population dynamics and behaviour,... -
A microsatellite perspective on the reproductive success of subordinate male honey badgers, Mellivora capensis
Item type: Journal Article • Journal: African Zoology • Authors: R. Verwey --- Department of Zoology, South Africa C. Begg --- Mammal Research Institute,, South Africa K. Begg --- Carnivore Conservation Group, Johannesburg C.A. Matthee --- Department of Zoology, South AfricaThe dominance hierarchy system of male honey badg ers, Mellivora capensis, does not appear to determine reproductive success in the species as subordinate males are frequently seen to gain brief access to re ceptive females. To establish whether these interac... -
Feeding rank in the Derby eland: lessons for management
Item type: Journal Article • Journal: African Zoology • Authors: Pavla Jůnková Vymyslická --- Department of Animal Science and Food Processing, Faculty of Tropical AgriSciences, Karolína Brandlová --- Department of Animal Science and Food Processing, Faculty of Tropical AgriSciences, Kateřina Hozdecká --- Department of Animal Science and Food Processing, Faculty of Tropical AgriSciences, Magdalena Žáčková --- Department of Animal Science and Food Processing, Faculty of Tropical AgriSciences, Pavla Hejcmanová --- Department of Animal Science and Food Processing, Faculty of Tropical AgriSciences,Transfers to new breeding herds and supplementary feeding are crucial management steps for small populations of ungulates. However, the successful realisation of those steps is strongly dependent on social interactions among individuals. Agonistic encounters connected with feeding determine the quality... -
Sustainable hospitality and tourism at different ages: Women’s and men’s attitudes in Italy
Item type: Journal Article • Journal: • Authors: Alessandra Fermani --- Department of Education, Cultural Heritage and Tourism, University of Macerata, Luigi Bertelli Campus, Macerata, Italy Isabella Crespi --- Department of Education, Cultural Heritage and Tourism, University of Macerata, Luigi Bertelli Campus, Macerata, Italy Flavia Stara --- Department of Education, Cultural Heritage and Tourism, University of Macerata, Luigi Bertelli Campus, Macerata, ItalyFuture tourism experiences will be more oriented towards eco-friendly destinations and dictated by responsible lifestyles, as shown by the Travel Trends Report and UNWTO report. Many studies confirm that the number of travellers looking for accommodation that ensures greater respect... -
Sustainable hospitality and tourism at different ages: Women’s and men’s attitudes in Italy
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Alessandra Fermani --- Department of Education, Cultural Heritage and Tourism, Italy Isabella Crespi --- Department of Education, Cultural Heritage and Tourism, Italy Flavia Stara --- Department of Education, Cultural Heritage and Tourism, ItalyFuture tourism experiences will be more oriented towards eco-friendly destinations and dictated by responsible lifestyles, as shown by the Travel Trends Report and UNWTO report. Many studies confirm that the number of travellers looking for accommodation that ensures greater respect... -
Inheritance of fruit neck, rind and seed coat hardness, and seed coat colour in bottle gourd
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nogbou F Amangoua --- UFR des Sciences de la Nature, Breeding and Crop Husbandry Unit, Côte d’Ivoire Kouamé K Koffi --- UFR des Sciences de la Nature, Breeding and Crop Husbandry Unit, Côte d’Ivoire Jean-Pierre Baudoin --- Unité de Phytotechnie Tropicale et d’Horticulture, Gembloux Agro-Bio Tech, Belgium Irié A Zoro Bi --- UFR des Sciences de la Nature, Breeding and Crop Husbandry Unit, Côte d’IvoireBottle gourd (Lagenaria siceraria (Molina) Standl.) is an edible, medicinal and decorative plant exhibiting wide genetic variation for fruit and seed characters, but it remains under-researched. This study assessed inheritance of fruit neck, fruit rind hardness, seed coat hardness and... -
Frequent burning maintained a stable grassland over four decades in the Drakensberg, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig D Morris --- , South Africa Colin S Everson --- , South Africa Terry M Everson --- , South Africa Paul J Gordijn --- , South AfricaThe mesic montane grasslands of the uKhahlamba-Drakensberg, which produce cured flammable fuel, have evolved under and are sustained by recurrent fires. The Brotherton burning trial (12 replicated treatments) was established at Cathedral Peak (1 890 m asl) in 1980 to... -
Changes in social dominance in a group of subadult white rhinoceroses (Ceratotherium simum) after dehorning
Item type: Journal Article • Journal: African Zoology • Authors: Samuel G Penny --- , United Kingdom Maxim Withey --- , United Kingdom Rachel L White --- , United Kingdom Dawn M Scott --- , United Kingdom Lynne MacTavish --- , United Kingdom Angelo P Pernetta --- , United KingdomIn many social species physical attributes correlate with dominance rankings and influence the outcomes of dyadic interactions. We investigated the processes that affect white rhinoceros’ social behaviour in response to a reduction in horn size asymmetries within a group of... -
An assessment of government policy response to HIV/AIDS in Ghana
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Julius Fobil --- School of Public Health, University of Ghana, Ireneous Soyiri --- School of Public Health, University of Ghana,The HIV/AIDS epidemic in Africa has assumed a dimension raising heartbreaking anxiety among national governments and civil society groups. In Ghana for example, the pandemic is well-documented and has gone beyond a health problem, and now encompasses all socio-economic aspects... -
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:...
