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AGE, GROWTH, REPRODUCTION AND MORTALITY OF THE BUTTER-CATFISH EUTROPIUS DEPRESSIROSTRIS (SCHILBEIDAE: PISCES) IN THE LUPHEPHE NWANEDZI IMPOUNDHENT, VENDA (SOUTH AFRICA)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: T. Hecht --- Department of Zoology, South AfricaAspects of the biology of Eutropius depressirostris in the Luphephe-Nwanedzi impoundment in north-east Venda (South Africa 30° 25' E, 23° 14' S) have been investigated. The Von Bertalanffy equation -
Patterns of thorn length, density, type and colour in African Acacias
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JJ Midgley MA Botha D BalfourIn Acacia no trade-off occurs between thorn length and thorn density and no correlation exists between thorn length and leaf length. By relating thorn length and density to leaf length it is clear that some species are better defended than... -
Why are spines of African Acacia species white?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JJ MidgleyThe straight white spines of African Acacia species are conspicuous, rather than being brown and cryptic as in other species. In comparison with species with brown spines, Acacia spines are composed of less dense material. I suggest that by the... -
Research note: Tests for inducible thorn defences against herbivory must consider plant growth strategies
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J.J. Midgley --- Botany Department, Republic of South Africa D. Ward --- Mitrami Centre for Desert Ecology, Jacob Blaustein Institute for Desert Research, IsraelThorn length and density on the latest year's growth were compared at three height (feeding) levels (<1m, >1m<2 m and >2 m) on individuals of Acacia karroo and Ziziphus mucronata in an area that was browsed by goats. Thorn length... -
Perioperative care of a pregnant trauma victim: a review of anesthetic considerations
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: KM Kuczkowski --- Departments of Anesthesiology and Reproductive Medicine, USA -
Healthy lifestyle interventions in general practice: Part 15: Lifestyle and lower back pain
Item type: Journal Article • Journal: South African Family Practice • Authors: MP Schwellnus --- UCT/MRC Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, DN Patel --- , C Nossel --- , S Whitesman --- Institute for Mindfulness South Africa, EW Derman --- UCT/MRC Research Unit for Exercise Science and Sports Medicine, Department of Human Biology,Lower back pain (LBP) is one of the most common medical problems in the adult population. LBP can be defined as pain, muscle tension or stiffness that is localised below the costal margin (inferior rib cage) and above the inferior... -
Further evidence that in African acacia, white is a warning colour to herbivores: the white pseudo-galls of Vachellia seyal
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jeremy Midgley --- University of Cape Town, South Africa Huyam Altayeb --- University of Cape Town, South Africa Patrick Mbosso --- University of Yalounde 1, CameroonPseudo-galls of three East African acacia (Vachellia) species were compared to determine the correlates of gall colour and their potential defensive functions. Although all three species produce white thorns, the pseudo-galls of V. gerrardii and V. drepanolobium are dark coloured... -
Predation on the St Joseph Callorhinchus capensis by Cape fur seals Arctocephalus pusillus pusillus in Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Leeney --- Namibia Nature Foundation, Namibia N Dreyer --- Ocean Conservation Namibia, NamibiaChondrichthyans form an important part of marine food webs as top predators and mesopredators. However, little is known about chondrichthyans in Namibian waters and the roles they play in ecosystem function. During efforts to disentangle Cape fur seals Arctocephalus pusillus...