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  1. Species/defoliation/drought interactions on tuft survival and tiller and phytomass production in four sourveld grass species in KwaZulu-Natal, South Africa

    Species/defoliation/drought interactions on tuft survival and tiller and phytomass production in four sourveld grass species in KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JCO du Toit --- Discipline of Grassland Science, South Africa
    Productivity and mortality of grass plants following drought may be controlled by interactions between defoliation and severity of the drought. Prudent grassland management might mitigate deleterious changes in species composition in multispecies grasslands. This study, conducted in a horticultural tunnel,...
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  2. Production speed effects on log-making error rates and value recovery for a mechanized processing operation in radiata pine in New Zealand

    Production speed effects on log-making error rates and value recovery for a mechanized processing operation in radiata pine in New Zealand

    Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: G.E. Murphy H.D. Marshall A.W. Evanson
    Mechanized processing operations are complex "man-machine" systems. The impacts of changes to work practices are, therefore, dependent on the effects the changes have on both the machine and the man. A mechanized processor, delimbing and cutting tree length stems into...
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  3. Hybridisation between native <em>Oreochromis</em> species and introduced Nile tilapia <em>O. niloticus</em> in the Kafue River, Zambia

    Hybridisation between native Oreochromis species and introduced Nile tilapia O. niloticus in the Kafue River, Zambia

    Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AM Deines --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USA I Bbole --- The Copperbelt University, Zambia C Katongo --- The Copperbelt University, Zambia JL Feder --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USA DM Lodge --- Notre Dame Environmental Change Initiative, and Department of Biological Sciences, USA
    The Nile tilapia Oreochromis niloticus has been introduced throughout Africa outside its native range for aquaculture purposes. Hybridisation between escaped O. niloticus and native Oreochromis species is of concern due to potential negative effects on wild genetic resources for conservation,...
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