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Determining sample size for assessing species composition in grassland1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M.B. Hardy --- Department of Agricultural Development, Republic of South Africa R.S. Walker --- Department of Grassland Science, Republic of South AfricaSpecies composition is measured in grasslands for a variety of reasons. Commonly, observations are made using the wheel‐point apparatus. However, the problem of determining optimum sample size has not yet been satisfactorily resolved. In this study the wheel‐point apparatus was... -
Sampling efficiency for species composition assessments using the wheel-point method in a semi-arid savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: BH BrockettA pilot survey to determine the sampling efficiency of the wheel-point method, using the nearest plant method, to assess species composition (using replicate similarity related to sampling intensity, and total sampling time) was conducted on three plot sizes (20 ×... -
Development of monitoring procedures for the herbaceous layer on the Northeastern Transvaal escarpment
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M. Stalmans --- Resource Ecology Group, Department of Botany, Republic of South Africa M.T. Mentis --- Resource Ecology Group, Department of Botany, Republic of South AfricaA step‐wise approach was followed towards the design of a monitoring system for the herbaceous layer on the escarpment of the Drakensberg mountains in the Transvaal, South Africa. The parameter of concern was proportional species composition. In a first phase,... -
Assessing and monitoring rangeland condition in extensive pastoral regions using satellite remote sensing and GIS techniques: An application to the Ceres Karoo region of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C.H. Mackay --- Resource Development Section, Department of Agriculture, Republic of South Africa HX. Zietsnian --- Institute for Geographical Analysis, Republic of South AfricaThe purpose of this paper is to describe the use of satellite remote sensing and GIS techniques in applying a localised range condition assessment methodology based on fence‐line contrasts. The approach was to compute six dissimilarity indices for data on... -
Bird diversity and land use on the slopes of Mt Kilimanjaro and the adjacent plains, Tanzania
Item type: Journal Article • Journal: African Zoology • Authors: Eija Soini --- World Agroforestry Centre (ICRAF), KenyaThis study of bird distribution in the main land-use categories of the slopes of Mt Kilimanjaro, Tanzania, aims at understanding potential impacts of the land-use changes on birds. A land-use map of the study area was derived from a Landsat... -
Inferring the links between breeding and wintering grounds in a Palearctic– African migratory bird, the Great Reed Warbler, using mitochondrial DNA data
Item type: Journal Article • Journal: African Zoology • Authors: Naglaa El-Arabany --- Department of Biology, Sweden Marjorie Sorensen --- Department of Zoology, UK Bengt Hansson --- Department of Biology, SwedenUnderstanding spatial connections between breeding and wintering populations is critical for developing sound conservation plans in migratory animals. However, for long-distance migratory songbird species wintering in sub-Saharan Africa, many of which are in a state of population decline, information on... -
Lie symmetry analysis for a 2+1 extended Boiti-Leon-Manna-Pempinelli equation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Andronikos Paliathanasis --- Institute of Systems Science, Durban University of Technology, Republic of South AfricaWe apply the theory of Lie symmetries for the analysis of the group properties for a recent proposed 2+1 extended Boiti-Leon-Manna-Pempinelli equation. The equation admits infinity Lie symmetries which corresponds to the infinity number of solutions. We show that D'Alember-type... -
Argument mining from Amharic argumentative texts using machine learning approach
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mikru Lake Melie --- Jimma University, Jimma Institute of Technology, Ethiopia Debela Tesfaye --- Jimma University, Jimma Institute of Technology, Ethiopia Alemu Kumilachew Tegegnie --- Bahir Dar University, Bahir Dar Institute of Technology, Ethiopia Derejaw Lake Melie --- Bahir Dar University, Bahir Dar Institute of Technology, EthiopiaArgument mining is an emerging science that deals with the automatic identification and extraction of arguments along with their relation from large, unstructured data that are useful for reasoning engines and computational models. Identification and extraction of argument relation from... -
Multiplication operators on the weighted Sobolev disk algebra
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Yucheng Li --- Hebei Normal University, China Kaikai Han --- Hebei University of Economics and Business, China Hexin Zhang --- Hebei Normal University, ChinaLet ⅅ be the unit disk in the complex plane ℂ. For α > −1, the weighted Sobolev disk algebra SA(ⅅ, dAα ) consists of all analytic functions in the weighted Sobolev space W 2,2(ⅅ, dAα ). In this paper,... -
On the analysis and integrability of the time-fractional stochastic potential-KdV equation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Nida Zinat --- Government College University, Pakistan Akhtar Hussain --- The University of Lahore, Pakistan A.H. Kara --- University of the Witwatersrand, South Africa F.D. Zaman --- Government College University, PakistanThis study investigates the invariance properties of the time-fractional stochastic potential-KdV (FSP-KdV) equation, intending to enhance our understanding of the dynamics associated with nonlinear photon and optical soliton propagation. The application of the Lie group analysis method enables the derivation...