Search
Search results for
We found
44 results for you
-
Performance of Medicago sativa under dryland conditions on the eastern Highveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N F G Rethman --- Department of Plant Production, J J Odendaal --- Department of Agriculture & Water Supply, Transvaal Region, C C De Witt --- Department of Agriculture & Water Supply, Transvaal Region,Increased livestock numbers and improved animal performance based on dryland lucerne pastures requiring little or no nitrogenous fertilizer have been demonstrated to be feasible on the eastern Highveld. With large scale planting of lucerne‐based pasture (25% of arable land) 350... -
Variation in important pasture grasses. II. Cytogenetic and reproductive variation
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.J. Spies --- Department of Agriculture and Water Supply, G.E. Gibbs Russell --- Department of Agriculture and Water Supply,The chromosome numbers and reproductive variation of seven important pasture grasses from South Africa are compared. This comparison indicates that all these species form polyploid complexes, all reproduce both sexually and either apomictically or vegetatively, and some form of hybridization... -
THE EFFECT OF TEMPERATURE ON SPECIFIC GROWTH RATE AND ACTIVATION ENERGY OF MICROCYSTIS AND SYNECHOCOCCUS ISOLATES RELEVANT TO THE ONSET OF NATURAL BLOOMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G. H.J. Krüger --- Department of Botany, South Africa J.N. Eloff --- Department of Botany, South AfricaTo investigate the correlation between temperature and the appearance of Microcystis blooms in nature, the effect of temperature on the growth of four Microcystis izolates (two toxic and two non-toxic) was investigated. The lower temperature limit for Microcystis varied between... -
THE EFFECT OF AGITATION AND TURBULENCE OF THE GROWTH MEDIUM ON THE GROWTH AND VIABILITY OF MICROCYSTIS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G. H.J. Krüger --- Departement of Botany, South Africa J.N. Eloff --- Departement of Botany, South AfricaObservation of natural blooms of Microcystis, suggested that increased turbulence plays a role in retarding bloom formation of Microcystis. In laboratory experiments the influence of turbulence mediated by a magnetic stirrer on the growth and viability of Microcystis in batch... -
MASS CULTURE OF
MICROCYSTIS UNDER STERILE CONDITIONSItem type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G. H.J. Krüger --- Botany Department, J.N. Eloff --- Botany Department,The design and use of a 601 all-glass culture system for the mass production of Microcystis (or other unicellular algae) under sterile conditions, are described. Bleaching and lysis of the cells could be prevented by controlling the pH and CO2... -
THE OCCURRENCE OF MICROCYSTIS AERUGINOSA IN THE BOTTOM SEDIMENTS OF A SHALLOW EUTROPHIC PAN
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: M. Tow --- Department of Botany and Microbiology, South AfricaSediment samples, collected from Jan Smuts Park Dam in Brakpan, Transvaal, during winter months were incubated in culture medium in the laboratory and found to contain viable Microcystis aeruginosa Kütz. emend. Elenkin colonies. The results obtained, indicate that the alga... -
CHEMICAL CHANGES IN THE GROWTH MEDIUM OF MICROCYSTIS, BATCH CULTURES GROWN AT STRESS AND NON-STRESS LIGHT INTENSITIES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G H J Krüger --- Botany Department, South Africa JN Eloff --- Botany Department, South AfricaThe modified BG 11 growth medium used in this study has a poor buffer ability and large pH changes occurred during growth of Microcystis. Inhibition of growth in cultures grown at stress light intensity (26 μEinst m−2 sec−1) could be... -
EFFECT OF PHOSPHATE CONCENTRATION ON THE FINE STRUCTURE OF THE CYANOBACTERIUM, MICROCYSTIS AERUGINOSA KÜTZ. EMEND. ELENKIN
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: DerylJ. Barlow --- , South Africa W. L.J. van Rensburl --- , South Africa A. J.H. Pieterse --- , South Africa J.N. Eloff --- , South AfricaMicrocystis aeruginosa toxic strain UV-006 stored a fixed amount of polyphosphate in spherical granules located in the centroplasm. Twenty four hours of phosphate starvation induced use of stored polyphosphate, manifested by reduction in granule numbers. Reintroduction of 2, 4 or... -
A COMPARISON OF MULTIPLE CONTAINER AND TUBULAR SYSTEMS FOR THE LARGE SCALE LABORATORY CULTURE OF UNICELLULAR ALGAE
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.N. Eloff --- Botany Department, South Africa G. H.J. Krüger --- Botany Department, South Africa A.J. van der Westhuizen --- Botany Department, South AfricaIt is pointed out that due to its construction a tubular system has many advantages, compared to a multiple container system. The most important being the ease of manipulation and the higher yield of algal material. The tubular system has... -
ASPECTS OF THE GROWTH OF MICROCYSTIS AERUGINOSA ON AGAR
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.A. Pretorius --- Botany Department, South Africa J.N. Eloff --- Botany Department, South AfricaMicrocystis aeruginosa could be grown only on four agarmedia tested even if the medium and agar were sterilised separately. The recovery varied from one experiment to another and between replicates, ranging from nil to more than 100%. Light intensities above... -
A SPECIFIC ULTRAVIOLET ABSORBANCE BAND OF MICROCYSTIS AERUGINOSA TOXINS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.N. Eloff --- Department of Botany, South AfricaIt could be shown that toxic fractions of Microcystis aeruginosa extracts always had a 240 nm absorbance band, There was a linear relationship between toxicity and UV absorbance at 240 nm of extracts from different isolates of Nicrocystis. One ml... -
TOXIN EXTRACTION FROM THE BLUE-GREEN ALGA MICROCYSTIS AERUGINOSA BY DIFFERENT EXTRACTION MEDIA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: A.J. van der Westhuizen --- Department of Botany, South Africa J.N. Eloff --- Department of Botany, South AfricaThe extractability of toxin from Microcystis aeruginosa isolate UV-006 by different extraction media such as O, 1N HC1, 2N CH3COOH, Triton X-100 and water at different pH levels was investigated. The best recovery of toxin was achieved with water at... -
CAROTENOID COMPOSITION AS TAXONOMIC CHARACTER FOR MICROCYSTIS ISOLATES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: E.J. Smit G. H.J. Krüger J.N. EloffNineteen Microcystis aeruginosa isolates, a Microcystis incerta and a Synechococcus grown under constant conditions were analyzed for pigment composition. The carotenoid composition of Microcystis incerta and a Synechococcus isolate differed markedly from that of the other isolates. Although there were... -
COUNTING NATURAL POPULATIONS OF MICROCYSTIS AERUGINOSA: A SIMPLE METHOD FOR COLONY DISRUPTION INTO SINGLE CELLS AND ITS EFFECT ON CELL COUNTS OF OTHER SPECIES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Tamar Zohary --- , Arcangela M. Pais Madeira --- ,A rapid, high-speed blending method for disrupting colonies of the cyanobacterium Microcystis aeruginosa to single cells in preparation for cell counts is described. Cell counts obtained for treated samples of natural populations of M. aeruginosa from Hartbeespoort Dam did not... -
MODELS OF ECOSYSTEMS AND AQUATIC ENVIRONMENTS: DEVELOPMENT AND APPLICATION
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. Allanson --- , South AfricaAn historical treatment of a number of principal events is given. This leads to an assessment of the current research approach in hydrobiology and its success in the development of process orientated ecosystem component models. With the contemporaneous development of... -
MANAGEMENT OPTIONS FOR SHALLOW HYPERTROPHIC LAKES, WITH PARTICULAR REFERENCE TO ZEEKOEVLEI, CAPE TOWN
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: W.R. Harding --- , South Africa A. J.R. Quick --- , South AfricaZeekocvlei, a freshwater coastal lake, is an important regional recreation area in the south-western Cape, South Africa. The lake is hypertrophic, experiences perenially dense populations of cyanobacteria (Microcystis), invasive bulrush and reed encroachment, and has a thick benthic layer of... -
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... -
Dynamics of a cyanobacterial bloom in a hypereutrophic reservoir, Lake Chivero, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mhlanga --- Department of Biological Sciences, Zimbabwe W Mhlanga --- Department of Environmental Science, ZimbabweBlooming and non-blooming periods between 2004 and 2006 in a hypereutrophic reservoir, where cyanobacterial blooms have previously been reported to be permanent, presented an opportunity to characterise factors that may favour cyanobacterial dominance. As a bloom developed in May 2004,... -
COUNTING NATURAL POPULATIONS OF MICROCYSTIS AERUGINOSA: A SIMPLE METHOD FOR COLONY DISRUPTION INTO SINGLE CELLS AND ITS EFFECT ON CELL COUNTS OF OTHER SPECIES
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: Tamar Zohary --- , ArcangelaM. Pais Madeira --- ,A rapid, high-speed blending method for disrupting colonies of the cyanobacterium Microcystis aeruginosa to single cells in preparation for cell counts is described. Cell counts obtained for treated samples of natural populations of M. aeruginosa from Hartbeespoort Dam did not... -
MODELS OF ECOSYSTEMS AND AQUATIC ENVIRONMENTS: DEVELOPMENT AND APPLICATION
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: B.R. Allanson --- , South AfricaAn historical treatment of a number of principal events is given. This leads to an assessment of the current research approach in hydrobiology and its success in the development of process orientated ecosystem component models. With the contemporaneous development of... -
Pruning quality affects infection of Acacia mangium and A. crassicarpa by Ceratocystis acaciivora and Lasiodiplodia theobromae
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M Tarigan --- Department of Microbiology and Plant Pathology, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa MJ Wingfield --- Department of Microbiology and Plant Pathology, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa M van Wyk --- Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South Africa B Tjahjono --- , Indonesia J Roux --- Department of Microbiology and Plant Pathology, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, South AfricaPruning (singling) is a common silvicultural practice in commercial Acacia plantations because these trees tend to have multiple stems. The wounds resulting from pruning are susceptible to infection by pathogens. Ceratocystis acaciivora and Lasiodiplodia theobromae have been shown recently to... -
Variations in the dominant algal bloom-forming species in the western South China Sea from 1993 to 2007
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CL Liu --- Key Laboratory of Tropical Marine Environmental Dynamics, and Key Laboratory of Marine Bio-resources Sustainable Utilization, China DL Tang --- Key Laboratory of Tropical Marine Environmental Dynamics, and Key Laboratory of Marine Bio-resources Sustainable Utilization, China SF Wang --- Key Laboratory of Tropical Marine Environmental Dynamics, and Key Laboratory of Marine Bio-resources Sustainable Utilization, China L Nguyen-Ngoc --- , VietnamThe study investigated the spatial and temporal variations of harmful algal bloom (HAB) species in the western South China Sea (SCS) for the period 1993-2007, using in situ HAB and remotely sensed datasets. A significant change in the dominant bloom... -
Knowledge, attitudes and behaviours of adolescents in relation to STIs, pregnancy, contraceptive utilization and substance abuse in the Mhlakulo region, Eastern Cape
Item type: Journal Article • Journal: South African Family Practice • Authors: A Bana --- Year-3 COBES Group, VG Bhat --- Department of Medical Microbiology, X Godlwana --- Year-3 COBES Group, S Libazi --- Year-3 COBES Group, Y Maholwana --- Year-3 COBES Group, N Marafungana --- Year-3 COBES Group, K Mona --- Year-3 COBES Group, AM Mbonisweni --- Year-3 COBES Group, N Mbulawa --- Year-3 COBES Group, J Mofuka --- Year-3 COBES Group, NA Mohlajoa --- Year-3 COBES Group, NN Nondula --- Year-3 COBES Group, Y Qubekile --- Year-3 COBES Group, B Ramnaran --- Year-3 COBES Group,Background: Sexually transmitted infections (STIs) and HIV/AIDS are a major problem in South Africa. This, coupled with a high incidence of teenage pregnancy, alcohol and drug abuse, is of grave concern, especially its impact among the young (15–24 years) and... -
Seasonal variability of secondary production of cladocerans and rotifers, and their trophic role in Lake Tana, Ethiopia, a large, turbid, tropical highland lake
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Wondie --- Department of Fisheries, Wetlands and Wildlife, Faculty of Agriculture and Environment, Ethiopia S Mengistou --- Department of Zoological Sciences, EthiopiaDaily and annual production rates of eight cladoceran and two rotifer species, and their seasonal variation and trophic role in the large, turbid, tropical Lake Tana, Ethiopia, were assessed in 2003–2005. Laboratory cultures were used to infer cladoceran development times,... -
Evaluating the inheritance of Ceratocystis acaciivora symptom expression in a diverse Acacia mangium breeding population
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jeremy Brawner --- Forest Industries Research Centre, Australia Yani Japarudin --- Sabah Softwood Berhad, Malaysia Mahadir Lapammu --- Sabah Softwood Berhad, Malaysia Redzuan Rauf --- Sabah Softwood Berhad, Malaysia David Boden --- Boden and Associates Pty Ltd, Australia Michael J Wingfield --- Forestry and Agricultural Biotechnology Institute, South AfricaA dramatic rise in the incidence of a serious canker and wilt disease of Acacia mangium has led to the replacement of thousands of hectares of plantation forests in eastern Sabah. A disease screening program was initiated to evaluate levels... -
Contraceptive use and prevalence of sexually transmitted infections among women seeking termination of pregnancy at a district hospital in KwaZulu-Natal
Item type: Journal Article • Journal: Southern African Journal of Epidemiology and Infection • Authors: Samuel Muruya --- Department of Obstetrics and Gynecology, Hannah Sebitloane --- Department of Obstetrics and Gynecology,Termination of pregnancy (TOP) is one of the components of female reproductive health and rights that are freely available in South Africa within the public health system, and yet unwanted pregnancies still remain a challenge. The objectives of this study... -
Laboratory-based surveillance of Pneumocystis jirovecii pneumonia in South Africa, 2006–2010
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: Desiree du Plessis --- National Institute for Communicable Diseases, South Africa Bhavani Poonsamy --- National Institute for Communicable Diseases, South Africa Veerle Msimang --- National Institute for Communicable Diseases, South Africa Leigh Davidsson --- Department of Diagnostics and Vaccinology, Sweden Cheryl Cohen --- National Institute for Communicable Diseases, South Africa Nelesh Govender --- National Institute for Communicable Diseases, South Africa Halima Dawood --- Department of Medicine, South Africa Alan Karstaedt --- School of Public Health, Faculty of Health Sciences, South Africa John Frean --- National Institute for Communicable Diseases, South AfricaBackground: We aimed to establish the characteristics of patients with confirmed Pneumocystis jirovecii pneumonia recruited by passive, sentinel laboratory-based surveillance. -
Hierarchical analysis of Swainson’s Spurfowl Pternistis swainsonii habitat use on Highveld maize and livestock farms
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Johann H van Niekerk --- Department of Environmental Sciences, College of Agriculture and Environmental Science, South AfricaThis paper explains habitat use by Swainson’s Spurfowl Pternistis swainsonii on maize Zea mays and livestock farms on the Highveld south-east of Johannesburg, South Africa. The purpose is to describe habitat modification methods to manipulate the abundance of Swainson’s Spurfowl... -
Female-only care of Swainson’s Spurfowl Pternistis swainsonii chicks frees males for territorial maintenance
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Johann H van Niekerk --- Department of Environmental Sciences, College of Agriculture and Environmental Science, South AfricaUniparental care often means that males do not contribute to the wellbeing of their offspring. For this reason, little attention has been given to avian species where the absent male contributes indirectly to the wellbeing of his chicks. This paper... -
Curcumin mitigates fenthion-induced testicular toxicity in rats: histopathological and immunohistochemical study
Item type: Journal Article • Journal: African Zoology • Authors: Amel I Othman --- Department of Zoology, Faculty of Science, Egypt Manal Abdel-Hamid --- Department of Zoology, Faculty of Science, EgyptFenthion is a widely used organophosphorus pesticide in agriculture that induces different cytotoxic effects, including male reproductive toxicity. The present work aimed to study the ameliorative effects of curcumin, a potential therapeutic agent against several chronic diseases, on reproductive toxicity... -
Role of site in the mortality and production of Acacia mangium plantations in Indonesia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Marcus Hardie --- Tasmanian Institute of Agriculture, University of Tasmania, Australia Nawari Akhmad --- Research and Development RAPP, APRIL Group, Indonesia Caroline Mohammed --- Tasmanian Institute of Agriculture, University of Tasmania, Australia Daniel Mendham --- CSIRO Ecosystem Sciences and Sustainable Agriculture Flagship, Australia Ross Corkrey --- Tasmanian Institute of Agriculture, University of Tasmania, Australia Abdul Gafur --- Research and Development RAPP, APRIL Group, Indonesia Sabar Siregar --- Research and Development RAPP, APRIL Group, IndonesiaIn Indonesia, Acacia mangium plantations exceed 1.6 Mha contributing approximately 3.5% of the country’s GDP. The viability of these plantations is increasingly threatened by fungal pathogens, insect pests, squirrels, monkeys, elephants and wind damage. Studies indicate that the problem is... -
Cyanotoxins in small artificial dams in Kenya utilised for cage fish farming – a threat to local people?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MN Kaggwa --- Department of Limnology and Oceanography, Austria N Straubinger-Gansberger --- Department of Limnology and Oceanography, Austria M Schagerl --- Department of Limnology and Oceanography, AustriaNine small artificial dams located in different climatic regions of Kenya were studied. The local communities use the stored water for various purposes, such as irrigation, domestic use, watering of livestock and cage fish farming. Such intense use is commonly... -
Taxonomy, phylogeny and biogeography of African spurfowls Galliformes, Phasianidae, Phasianinae, Coturnicini: Pternistis spp.
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Tshifhiwa G Mandiwana-Neudani --- Department of Biodiversity, South Africa Robin M Little --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, Department of Biological Sciences, South Africa Timothy M Crowe --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, Department of Biological Sciences, South Africa Rauri CK Bowie --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, Department of Biological Sciences, South AfricaAfro-Asiatic perdicine galliform birds, commonly and inconsistently referred to as francolins, spurfowls and partridges, have contentious taxonomic and phylogenetic histories. In a widely followed monograph, Hall combined two putative monophyletic, but taxonomically unnamed, clades comprising 28 perdicine species known as... -
Age classes of developing Red-necked Spurfowl Pternistis afer based on plumage, morphology and behaviour
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Johann H van Niekerk --- Department of Environmental Sciences, College of Agriculture and Environmental Sciences, South AfricaThis paper describes the plumage and morphology development of 11 age classes of Red-necked Spurfowl Pternistis afer to assist with field observations. Sixteen spurfowl were marked with coloured leg rings in the Cannon Rocks Holiday Resort, Eastern Cape, South Africa... -
Disc pasture meter calibration to estimate grass biomass production in the arid dunefield of the south-western Kalahari
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Christiaan J Harmse --- Eiland Research Station, Northern Cape Department of Agriculture, Land Reform and Rural Development, South Africa Niels Dreber --- Department of Ecosystem Modelling, Faculty of Forest Sciences and Forest Ecology, Germany Winston SW Trollope --- Working on Fire International, South AfricaThe disc pasture meter (DPM) is a tool that is widely used to estimate aboveground standing grass biomass (ASB) in a rapid and non-destructive manner. Depending on the species composition, rangeland condition and local climate, available DPM calibrations may fail... -
Clarifying taxonomic, distributional and genetic information relating to subspecies of the Hildebrandt’s Spurfowl Pternistis hildebrandti and the Yellow-necked Spurfowl P. leucoscepus
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Timothy M Crowe --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, Department of Biological Sciences, South Africa Robin M Little --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, Department of Biological Sciences, South Africa Donald A Turner --- Bird Committee of Nature Kenya, KenyaWe provide suggested errata vis-à-vis Mandiwana-Neudani TG, Little RM, Crowe TM, Bowie RCK. 2019. Taxonomy, phylogeny and biogeography of African spurfowls Galliformes, Phasianidae, Phasianinae, Coturnicini: Pternistis spp. Ostrich 90(2): 145–172. Firstly, the name fischeri was incorrectly applied to the southern... -
Local ecological knowledge demonstrates shifting baselines and the large-scale decline of sawfishes (Pristidae) in Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Braulik --- University of St Andrews, United Kingdom M Kasuga --- Wildlife Conservation Society Tanzania Program, Tanzania G Majubwa --- Ambakofi, TanzaniaSawfishes are coastally distributed rays that grow to very large sizes. All five species are assessed as Endangered or Critically Endangered as a result of population declines caused mainly by entanglements in fishing gear and by habitat degradation. Three species... -
A survey of phytoplankton and zooplankton communities in the newly created Tugwi-Mukosi reservoir, Zimbabwe, during the filling phase
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mhlanga --- , Zimbabwe TC Madzivanzira --- , Zimbabwe T Nhiwatiwa --- , Zimbabwe P Tendaupenyu --- , Zimbabwe M Barson --- , Zimbabwe L Marufu --- , Zimbabwe N Songore --- , ZimbabweThe plankton assemblages of Tugwi-Mukosi reservoir in south-eastern Zimbabwe were assessed seven months after impoundment to form a baseline for future monitoring and tracking of changes linked to the reservoir’s ontogenetic development processes. While cyanobacteria were the dominant group at... -
Water quality of the volcanic crater lake, Lake Barombi Kotto, in Cameroon
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ME Awo --- , Cameroon BA Fonge --- , Cameroon PT Tabot --- , Cameroon JTK Akoachere --- , CameroonCameroon is endowed with many freshwater lakes and rivers but, because of increasing anthropogenic activities, most of these water bodies are gradually being degraded. Lake Barombi Kotto is one of the volcanic crater lakes in Cameroon that serves as a... -
Germination performance of different forage grass species at different salinity (NaCl) concentrations
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M Mangwane --- , South Africa IC Madakadze --- , South Africa FV Nherera-Chokuda --- , South Africa S Dube --- , Zimbabwe M Mndela --- , South AfricaCertain grasses show potential for the rehabilitation of coalmine spoils. Species selection and evaluation are used to guide the choice of the most appropriate grass species. This study evaluated the germination performance of seven forage grass species, with some represented... -
Predictors of parent–child communication among a nationally representative sample in Nigeria
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Katrina Berg [d113e18] Christina J. Sun Stella BabalolaThis study explores what constructs are associated with parent–adolescent communication about AIDS/sexually transmitted infections (STIs) and sexual relationships in Nigeria. The analyses use data from the 2007 National HIV/AIDS and Reproductive Health Survey on 2593 men and women who had... -
Cadmium exposure induces testicular oxidative damage and histopathological changes in the freshwater leech Limnatis nilotica (Savigny, 1822): the protective role of salicylic acid
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ichrak Khaled --- University of Gafsa, Tunisia Issam Saidi --- University of Gafsa, Tunisia Raja Ben Ahmed --- Université de Tunis El Manar, Tunisia Ramzi Amari --- University of Gafsa, Tunisia Waleed Aldahmash --- King Saud University, Saudi Arabia Octavian Pacioglu --- National Institute of Research and Development for Biological Sciences, Romania Najla Hfaiedh --- University of Gafsa, Tunisia Abdel Halim Harrath --- King Saud University, Saudi ArabiaThe present study examined the histopathological changes and some parameters of oxidative stress in the testes of the freshwater leech Limnatis nilotica, following their exposure to 50 µg l−1 of cadmium (Cd). The protective effects of salicylic acid (SA) in... -
Do native grasses emerge and establish in areas rehabilitated using vetiver grass?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Lindokuhle X Dlamini --- University of KwaZulu-Natal, South Africa Michelle J Tedder --- University of KwaZulu-Natal, South Africa Kevin P Kirkman --- University of KwaZulu-Natal, South AfricaSpecies-rich grasslands provide important ecosystem services, and in South Africa, approximately 40% of these grasslands are degraded. Vetiver grass (from India) is often used during rehabilitation efforts to restore soil function without a thorough understanding of the potential negative ecological... -
Parasitoid guild of the citrus leafminer, Phyllocnistis citrella Stainton (Lepidoptera: Gracillariidae) in Tunisian citrus orchards and a new report of Cirrospilus ingenuus Gahan (Hymenoptera: Eulophidae)
Item type: Journal Article • Journal: African Zoology • Authors: Dorra Mansour --- University of Sousse, Regional Research Centre on Horticulture and Organic Agriculture at Chott Meriem, Institut Supérieur Agronomique de Chott-Mariem, Tunisia Mohamed Braham --- University of Sousse, Regional Research Centre on Horticulture and Organic Agriculture at Chott Meriem, Institut Supérieur Agronomique de Chott-Mariem, TunisiaA survey of the parasitoid species of the citrus leafminer (CLM), Phyllocnistis citrella Stainton (Lepidoptera: Gracillariidae), a cosmopolitan pest of citrus, was carried out in 2019 and 2020 in the major citrus production area of Tunisia. Four different Eulophidae species...
