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Effect of different day and night temperatures on the diurnal growth rate of terminal and lateral fruits in Golden Delicious apple
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South Africa DeV. Cloete --- , Republic of South AfricaThe diurnal growth rate of terminal and lateral fruitlets in the same cluster was studied in Golden Delicious under varying night and day temperature conditions In growth chambers as well as in the open. Terminal and lateral fruitlets had a... -
THE DIURNAL MIXED LAYER IN LAKES AND OCEANS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: JohnL. Largier --- Division of Earth, Marine and Atmospheric Science and Technology, South AfricaIn this review the current ideas on diurnal mixed layers are discussed with reference to several observations. Essentially, solar heating sets up a shallow thermocline which traps and concentrates further influx of heat and momentum in the top few metres... -
The burrowing behaviour of Bulinus nyassanus, intermediate host of Schistosoma haematobium, in Lake Malaŵi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Madsen --- DBL Centre for Health Research and Development, Faculty of Life Sciences, JR Stauffer --- School of Forest Resources, USAThere is evidence that transmission of Schistosoma haematobium has increased in some areas in the southern part of Lake Malaŵi, where transmission occurs both along open shorelines and at inland sites. Transmission along open shores in the lake is via... -
Diurnal patterns of mass gain in tropical granivores suggest avoidance of high midday temperatures during foraging, rather than the starvation–predation risk trade-off
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Shiiwua Manu --- AP Leventis Ornithological Research Institute, Nigeria Will Cresswell --- School of Biology, UKDiurnal patterns of body mass gain in small temperate birds are of theoretical interest because they are largely a consequence of the starvation vs predation risk trade-off. In tropical birds, diurnal variation in body mass may also be influenced by... -
Status and diurnal activity budget of non-breeding White-headed Ducks Oxyura leucocephala in Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Nedjwa Meziane --- Laboratoire de Recherche et de Conservation des Zones Humides, Algeria Farrah Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, Algeria Boudjéma Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, AlgeriaIn Algeria, the Globally Endangered White-headed Duck Oxyura leucocephala is resident throughout the year in the coastal wetlands of north-east Algeria and the Hauts Plateaux, where it occupies habitats that range from freshwater ponds and brackish marshes to hypersaline lakes... -
Metabolic activity throughout early development of dusky kob Argyrosomus japonicus (Sciaenidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Edworthy --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa B Erasmus --- Department of Ichthyology and Fisheries Science, South Africa JOG Kemp --- Department of Ichthyology and Fisheries Science, South Africa H Kaiser --- Department of Ichthyology and Fisheries Science, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe physiology of fishes in the early stages of development remains poorly assessed despite the importance of identifying energy bottlenecks in organisms faced with changing environmental conditions. This study describes the metabolic activity of dusky kob Argyrosomus japonicus throughout its... -
Diurnal activity patterns of Harwood’s Spurfowl Pternistis harwoodi in relation to habitat types and climatic conditions in the Central Highlands of Ethiopia
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Abadi Mehari Abrha --- Department of Animal, Rangeland and Wildlife Sciences, Ethiopia Shimelis Aynalem Zelelew --- Department of Fisheries, Ethiopia Habtu Kiros Nigus --- Department of Statistics, Ethiopia Aschalew Alelign --- Department of Animal, Rangeland and Wildlife Sciences, EthiopiaHarwood’s Spurfowl Pternistis harwoodi is an endemic bird of Ethiopia. Globally, it is categorised as Vulnerable. Habitat loss and hunting are the major conservation threats to the species. This study investigated the activity patterns of Harwood’s Spurfowl in relation to... -
Diel activity patterns of two syntopic range-restricted geckos suggest idiosyncratic responses to climate change
Item type: Journal Article • Journal: African Zoology • Authors: MA Petford --- , South Africa GJ Alexander --- , South AfricaMeasures of activity patterns in relation to environmental conditions provide insights into ecologically driven requirements and climate preferences of species, particularly for ectotherms, due to the strong relationship between body temperature (Tb) and environmental temperatures. Lygodactylus incognitus (cryptic dwarf gecko)... -
Temperature cycles beneath, and adjacent to, intertidal boulders and associated differences in biotic composition
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C van Rensburg --- , South Africa A Robbins --- , South Africa C Griffiths --- , South AfricaThe only previous study on the macrobiota of South African boulder shores showed this assemblage to be more diverse than on nearby rocky platforms, but the drivers of that difference remain unresolved. We recorded water and air temperatures under intertidal... -
Spatial and diurnal distribution of carbon monoxide (CO) and its health and environmental implications in selected locations in the Niger Delta Area of Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Iwekumo Ebibofe Agbozu --- Federal University of Petroleum Resources Effurun, Nigeria Osayomwanbor Ebenezer Oghama --- Federal University of Petroleum Resources Effurun, NigeriaEmission of carbon monoxide (CO) poses unprecedented risks in urban environments. Moreover, there has been a growing concern about the incidences of deaths arising from suffocation by CO fumes in Nigeria. Hence, this study attempts to evaluate the spatial and...