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AN EXPERIMENTAL EVALUATION OF THE INFLUENCE OF TEMPERATURE ON THE NATURAL RATE OF INCREASE OF DAPHNIA PULEX DE GEER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.G. van As --- Department of Zoology, South Africa C. Comhrinck --- Department of Zoology, South Africa A.J. Reinecke --- Department of Zoology, South AfricaCohorts of Daphnia pulex from Boskop Dam, an irrigation reservoir near Potchefstroom, Transvaal, were kept at natural food levels under constant temperatures of 10, 15 and 20°C as well as under conditions of temperature with a diurnal fluctuation varying between... -
Variable community responses to herbivory in fire-altered landscapes of northern Patagonia, Argentina
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: T Kitzberger E Raffaele T VeblenLandscapes in northern Patagonia have undergone dramatic changes in fire regimes over the last century. Superimposed on this changing vegetation mosaic are impacts from introduced herbivores. In this paper we identify synergistic interactions developing into positive fire-herbivory feedbacks that maximise... -
Influence of sward defoliation and soil disturbance on seedling emergence and survival in the Southern Tall Grassveld
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: K.M. Adams --- Department of Zoology, Republic of South AfricaSeedling emergence, survival and species composition were recorded on vegetation subjected to seven practicably feasible soil and defoliation treatments. Soil disturbance, with defoliation removal, produced the greatest number of emergents; these also had the best survivorship compared to other treatments... -
Satellite telemetry of Afrotropical ducks: methodological details and assessment of success rates
Item type: Journal Article • Journal: African Zoology • Authors: Graeme S. Cumming --- Percy FitzPatrick Institute, DST/NRF Center of Excellence, University of Cape Town, Rondebosch, South Africa Mduduzi Ndlovu --- Percy FitzPatrick Institute, DST/NRF Center of Excellence, University of Cape Town, Rondebosch, South AfricaDespite widespread and increasing use of solarpowered satellite transmitters to tag wild birds, there are few published articles that detail how transmitters should be attached to different species and even fewer assessments of the overall field success of telemetry projects... -
The population dynamics of four grass species in relation to burning in the KwaZulu-Natal Drakensberg
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Colin S Everson --- , South Africa Terry M Everson --- , South Africa Craig D Morris --- , South AfricaMarked tillers of Heteropogon contortus, Trachypogon spicatus, Tristachya leucothrix and Harpochloa falx were sampled regularly over a two-year period in Highland Sourveld burnt annually in winter and biennially in spring. Parameters recorded were height of shoot apex, tiller mass, number... -
Forgetting to take HIV antiretroviral therapy: a qualitative exploration of medication adherence in the third decade of the HIV epidemic in the United States
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: R. Freeman --- , USA M. Gwadz --- New York University Silver School of Social Work, USA K. Francis --- New York University Silver School of Social Work, USA E. Hoffeld --- New York University Silver School of Social Work, USAOptimal adherence to HIV antiretroviral therapy (ART) is challenging, and racial/ethnic disparities in adherence rates are substantial. The most common reason persons living with HIV (PLWH) give for missed ART doses is forgetting. We took a qualitative exploratory approach to...
