Search
Search results for
We found
7 results for you
-
Intergroup Attitude Change in South Africa: A Thirty-Seven Year Longitudinal Study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Johan C. Mynhardt --- University of South Africa,This longitudinal study reports intergroup attitude changes in South Africa over a 37-year period beginning from the 1970s when the apartheid dispensation was still firmly in place, following by a second data collection period after a time of political turmoil... -
Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Roy CD van der Lingen JC Coetzee JRE LutjeharmsCape anchovy Engraulis encrasicolus spawners in the southern Benguela showed an eastward shift in their distribution on the Agulhas Bank that occurred abruptly in 1996 and has since persisted. We assessed whether this shift was environmentally mediated by examining sea... -
Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Skern-Mauritzen --- , Norway SP Kirkman --- Animal Demography Unit, Department of Zoology, South Africa E Olsen --- , Norway A Bjørge --- , Norway L Drapeau --- , France MA Meÿer --- Department of Environmental Affairs, South Africa J-P Roux --- Ministry of Fisheries and Marine Resources, Namibia S Swanson --- Department of Environmental Affairs, South Africa WH Oosthuizen --- Department of Environmental Affairs, South AfricaThe northern Benguela ecosystem adjoining Namibia has undergone considerable changes in recent decades, with reductions and northwards shifts of key prey species that have had severe implications for marine top predator populations. We investigated how such environmental variability may impact... -
Fish utilization of surf-zones. Are they changing? A case study of the Sheltered, warm-temperate King’s Beach
Item type: Journal Article • Journal: African Zoology • Authors: Gavin M. Rishworth --- Department of Zoology, South Africa Nadine A. Strydom --- Department of Zoology, South Africa Warren Potts --- Department of Ichthyology and Fisheries Science, South AfricaSurf-zone fish communities and their shifts over time are generally poorly understood. The aim of this study was to compare the current surf-zone fish assemblage at King's Beach, South Africa, to a similar study conducted three decades ago, before the... -
The diet and trophic ecology of non-native Micropterus salmoides in two South African impoundments
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GC Taylor --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JM Hill --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaLargemouth bass Micropterus salmoides is a highly successful predator that preys on fish and invertebrates. Highly popular with anglers, it is one of the most introduced and invasive fish globally, with strong potential to alter ecosystem structure and functioning. A... -
Examining swap butterfly risk premia in South Africa
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Sanveer Hariparsad --- University of Pretoria, South Africa Eben Maré --- University of Pretoria, South AfricaThis paper studies a long butterfly strategy (which is immune to parallel curve shifts but exposed to non-parallel curve shifts) on the South African interest rate swap curve. Ten swap butterfly risk factors are identified using monthly South African swap... -
The maximum norm error estimate and Richardson extrapolation methods of a second-order box scheme for a hyperbolic-difference equation with shifts
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dingwen Deng --- Nanchang Hangkong University, China Zhu-an Wang --- Nanchang Hangkong University, China Zilin Zhao --- Nanchang Hangkong University, ChinaThe study aims at the development and theoretical analyses of a box method used to solve a kind of hyperbolic equations with shifts. By using the discrete energy method, it is shown that numerical solutions converge to exact solutions with...