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Morphological and electrophysiological field observations on electric freshwater fish of the genus Mormyrops Müller 1843 (Teleostei: Mormyridae) from West and southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Kramer --- Zoological Institute of the University of Regensburg, GermanyDifferent specimens of Mormyrops anguilloides (Linnaeus 1758) were reported to display electric organ discharge (EOD) pulses of either initially head-positive or initially negative polarity, a hypothetical sex difference that has not been substantiated to date. The morphology and EODs of... -
Shelf currents, lee-trapped and transient eddies on the inshore boundary of the Agulhas Current, South Africa: their relevance to the KwaZulu-Natal sardine run
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ Roberts --- Oceans and Coasts, Department of Environmental Affairs, South Africa CD van der Lingen --- Branch Fisheries, Department of Agriculture, South Africa C Whittle --- Department of Oceanography, South Africa M van den Berg --- Oceans and Coasts, Department of Environmental Affairs, South AfricaThe existence and strength of the annual KwaZulu-Natal (KZN) sardine run has long been a conundrum to fishers and scientists alike ― particularly that the sardine Sardinops sagax migrate along the narrow Transkei shelf against the powerful, warm Agulhas Current... -
Univariate tests of momentum on the JSE
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Daniel Page --- Finance Division, School of Economic & Business Sciences, South Africa Christo Auret --- Finance Division, School of Economic & Business Sciences, South AfricaThis study intends to test whether medium-term price momentum is present on the cross-section of shares listed on the JSE. Using the methodology of Jegadeesh and Titman (1993; 2001), shares are sorted applying four estimation periods (E = 3, 6,... -
Time varying correlations and causalities between stock and foreign exchange markets: Evidence from China, Japan and Korea
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Young K. Park --- Business School, Korea Ki Beom Binh --- Department of Economics, Korea Suk-Joong Kim --- Discipline of Finance, AustraliaThis paper examines the time-varying relationship between the stock and the foreign exchange markets for China, Japan and Korea for the period July 2005 to November 2013. The cross-market relationship within each country differs among the three countries and varies... -
Idiosyncratic momentum on the JSE
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Daniel Page --- , South Africa David McClelland --- , South Africa Christo Auret --- , South AfricaIdiosyncratic momentum, like price momentum, is a trading strategy that considers a share’s recent relative performance over the short to medium term. Idiosyncratic momentum differs from price momentum as it uses residual returns post-orthogonalization on a single or multi-factor asset...