Articles by Keyword: Current State

Search results for Current State

We found 78 results for you
  1. Developing a protocol for managing the biophysical condition of a water management area: the Sabie catchment case study

    Developing a protocol for managing the biophysical condition of a water management area: the Sabie catchment case study

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Recent modification of the South African Water Law spells out fundamental changes for the way the country's water resources will be managed in the future. One of the most significant mandates is the establishment of Catchment Management Agencies (CMAs) and...
  2. Plant species dynamics in the Southern Tall Grassveld under grazing, resting and fire

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    An analysis of temporal changes in botanical composition in a long‐term grazing trial indicates that species dynamics in the Southern Tall Grassveld of Natal are determined by the specific combination of grazing, mowing and fire impacts. Species composition of a...
  3. THE INVERTEBRATE FAUNA AND BIOTIC INDEX VALUE OF WATER QUALITY OF THE GREAT BERG RIVER, WESTERN CAPE

    THE INVERTEBRATE FAUNA AND BIOTIC INDEX VALUE OF WATER QUALITY OF THE GREAT BERG RIVER, WESTERN CAPE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The invertebrate fauna was sampled at seven localities in the main stream of the Berg River in 1974. These results are discussed and compared with those of Harrison and Elsworth (1958). The results obtained were also used in applying the...
  4. Genetic and morphological variation of the lanternfish <em>Lampanyctodes hectoris</em> (Myctophiformes: Myctophidae) off southern Africa

    Genetic and morphological variation of the lanternfish <em>Lampanyctodes hectoris</em> (Myctophiformes: Myctophidae) off southern Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Genetic and morphological variation within the southern African population of Lampanyctodes hectoris was analysed. A total of 15 enzymes, encoding 22 isozyme loci, was examined (n = 327); seven were polymorphic. The percentage of polymorphic loci ranged from 13.6 to...
  5. Long-distance migration of the rock lobster <em>Palinurus delagoae</em> off South Africa and Moçambique

    Long-distance migration of the rock lobster <em>Palinurus delagoae</em> off South Africa and Moçambique

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Long-distance migration patterns of deep-water rock lobster Palinurus delagoae were investigated using tagrecapture data obtained over a period of 6 years (1995–2000). Of 7 654 animals tagged, 363 (4.7%) were recovered from South African and seven (0.1%) from Moçambican waters...
  6. CIRCULATION IN HIGHLY STRATIFIED SOUTHERN AFRICAN ESTUARIES

    CIRCULATION IN HIGHLY STRATIFIED SOUTHERN AFRICAN ESTUARIES

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The nature of estuarine circulation under highly stratified conditions is reviewed in the context of southern African estuaries that are small and have a constricted connection to the ocean. While the focus is on the generic hydrodynamic processes and features,...
  7. Remote sensing and change detection in rangelands

    Remote sensing and change detection in rangelands

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    During the 20 th century, we have witnessed an improvement in the quality of imagery available for rangeland auditing, from the earliest mono-chromatic aerial photographs, followed by the first infra-red images, to the abundance of high resolution, multi-spectral imagery currently...
  8. The grazing index method of range condition assessment

    The grazing index method of range condition assessment

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Owing to the difficulty of examining succession theory in the Karoo, it is suggested the ecological index method (EIM), be replaced by the grazing index method (GIM), through the introduction of grazing index values (GIV) for Karoo plant species. The...
  9. Description of a method for assessing veld condition in the Karoo

    Description of a method for assessing veld condition in the Karoo

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    In the past, veld condition in the Karoo was assessed according to the ecological index method. This has recently been replaced by the grazing‐index method. The principles governing the method of botanical survey remain the same, but this methodology has...
  10. OPTIMAL SYSTEMS OF SYMMETRY SUBALGEBRAS FOR BIG MODELS OF GASDYNAMICS

    OPTIMAL SYSTEMS OF SYMMETRY SUBALGEBRAS FOR BIG MODELS OF GASDYNAMICS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    The gasdynamics equations admit 11 dimensional Lie algebra of transformations for the abitrary state equations. For special state equations the algebra may be expanded. There are 13 special state equations for which the gasdynamics equations are named big models. Some...