People-Environment Trade-offs in Managing Communal Rangelands of South Africa

Communal rangelands in South Africa support a range of ecosystem services including water provision, carbon sequestration and livestock production for different stakeholders. Delivering these in a sustainable and socially appropriate manner necessarily requires trade-offs to be made between the different environmental and social outcomes required. We draw on empirical fieldwork and a two-day participatory stakeholder workshop to report on the early stages of a project evaluating these trade-offs in communal rangelands of the uMzimvubu catchment in Eastern Cape Province. Our findings suggest that trade-offs will be necessary at a variety of different levels within this system. For example, a key activity within these rangelands is removal of invasive plants such as wattle (Acacia mearnsii) but the environmental gains are conflictual as although this increases water availability within the system, it potentially reduces stored carbon. Wattle removal also highlights a disconnection between people and policy. While current policy mandates complete eradication of wattle, none of the local communities involved in the research wished to see this, as most of them currently make use of the trees for a range of purposes including timber, fuelwood and even livestock feed. Furthermore, trade-offs are also required between different community members, in terms of the social outcomes rangelands can deliver for them. While men conceptualised rangelands largely in terms of maximising livestock production, women focused on the collection of natural resources such as timber, herbs and thatching grass, the latter requiring accumulation of biomass during the growing season and potentially removing areas of rangeland from grazing. Understanding the opposing goals for rangeland use that exist within and between different stakeholder groups is critical to evaluating the social and environmental trade-offs required and to reach a consensus approach to the governance and management of these systems

An aqueous extract of Maerua edulis (Gilg & Ben) DeWolf tuber is as effective as a commercial synthetic acaricide in controlling ticks on cattle in vivo

Farmers in Zimbabwe claim that plant extracts of Cissus quadrangularis, Aloe vera and Maerua edulis are effective in controlling cattle ticks. On-station experiments were conducted at Henderson Research Station to determine the in-vivo efficacy of crude aqueous extracts of Cissus quadrangularis (succulent stems), Aloe vera (succulent leaves) and Maerua edulis (leaves and tuber) at concentrations of 15%, 15% and 10% w/v respectively, against cattle ticks. An amitraz-based acaricide and water were used as positive and negative controls, respectively. Thirty Mashona steers were allocated to the six treatments in a completely randomised design experiment where each animal was an experimental unit replicated five times. The animals were each sprayed weekly with 5 L of the test or control solutions using a knapsack sprayer after which full body tick counts were recorded every other day for seven weeks. The experiments were conducted between January and February when conditions are optimal for tick development. The M. edulis tuber extract was as effective as the amitraz-based commercial acaricide. The other three plants extracts were, however, as ineffective as the negative control (water). Maerua edulis tuber plus soapy water-oil extract is effective against cattle ticks and have potential to be developed into an acaricidal product and thus benefit mostly resource-challenged smallholder farmers who cannot afford commercial synthetic acaricides. In vivo studies using acaricidal plants are rare.The European Commission’s European Development Fund ACP S&T Programme grant FED/2013/329272 (OPTIONs).http://www.elsevier.com/locate/indcrop2018-12-30hj2018Paraclinical Science