Articles by Keyword: Harmful Algae

Search results for Harmful Algae

We found 48 results for you
  1. Intraspecific variability: an important consideration in forming generalisations about toxigenic algal species

    Intraspecific variability: an important consideration in forming generalisations about toxigenic algal species

    Item type: Journal Article • Journal: African Journal of Marine Science
    Intraspecific variability (strain differences) in key characteristics such as life-history traits, behaviour, nutrition, genetics and toxicity, has been experimentally documented for many toxigenic microalgae, including species of cyanobacteria, dinoflagellates, haptophytes, raphidophytes and diatoms. This paper summarises findings from published studies...
  2. Seaweed species diversity in South Africa

    Seaweed species diversity in South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    A dataset is presented on the diversity of South African seaweed species and their distribution in contiguous 50-km coastal sections, to demonstrate current knowledge of the flora in various coastal regions. The coastline has a rich flora, consisting of some...
  3. CHEMICAL CHANGES IN THE GROWTH MEDIUM OF <em>MICROCYSTIS</em>, BATCH CULTURES GROWN AT STRESS AND NON-STRESS LIGHT INTENSITIES

    CHEMICAL CHANGES IN THE GROWTH MEDIUM OF <em>MICROCYSTIS</em>, BATCH CULTURES GROWN AT STRESS AND NON-STRESS LIGHT INTENSITIES

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The modified BG 11 growth medium used in this study has a poor buffer ability and large pH changes occurred during growth of Microcystis. Inhibition of growth in cultures grown at stress light intensity (26 μEinst m−2 sec−1) could be...
  4. EARLY OBSERVATIONS ON SOME LIMNOLOGICAL CHARACTERISTICS OF THREE ORANGE FREE STATE IMPOUNDMENTS

    EARLY OBSERVATIONS ON SOME LIMNOLOGICAL CHARACTERISTICS OF THREE ORANGE FREE STATE IMPOUNDMENTS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The first limnological investigations on three impoundments in the Orange Free State are described. No thermal stratification was found and water temperatures below 8,6°C were not measured. The waters were turbid and the unfavourable underwater light climate was the major...
  5. TOXIN EXTRACTION FROM THE BLUE-GREEN ALGA <em>MICROCYSTIS AERUGINOSA</em> BY DIFFERENT EXTRACTION MEDIA

    TOXIN EXTRACTION FROM THE BLUE-GREEN ALGA <em>MICROCYSTIS AERUGINOSA</em> BY DIFFERENT EXTRACTION MEDIA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The extractability of toxin from Microcystis aeruginosa isolate UV-006 by different extraction media such as O, 1N HC1, 2N CH3COOH, Triton X-100 and water at different pH levels was investigated. The best recovery of toxin was achieved with water at...
  6. CAROTENOID COMPOSITION AS TAXONOMIC CHARACTER FOR <em>MICROCYSTIS</em> ISOLATES

    CAROTENOID COMPOSITION AS TAXONOMIC CHARACTER FOR <em>MICROCYSTIS</em> ISOLATES

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Nineteen Microcystis aeruginosa isolates, a Microcystis incerta and a Synechococcus grown under constant conditions were analyzed for pigment composition. The carotenoid composition of Microcystis incerta and a Synechococcus isolate differed markedly from that of the other isolates. Although there were...
  7. TOXIC CONCENTRATION OF FREE AMMONIA TO <em>BRACHIONUS CALYCIFLORUS</em> PALLAS, A ROTIFER PEST SPECIES FOUND IN HIGH RATE ALGAL PONDS (HRAP's)

    TOXIC CONCENTRATION OF FREE AMMONIA TO <em>BRACHIONUS CALYCIFLORUS</em> PALLAS, A ROTIFER PEST SPECIES FOUND IN HIGH RATE ALGAL PONDS (HRAP's)

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Laboratory tests on Brachionus calyciflorus Pallas indicate that at low concentrations of free ammonia (< 7 mg l −1) pH levels up to 9,85 could be tolerated for 96 h without apparent ill effect. Free ammonia concentrations > 14,4 mg...
  8. A PRELIMINARY LIMNOLOGICAL INVESTIGATION OF TWELVE SOUTHERN AFRICAN GEOTHERMAL WATERS

    A PRELIMINARY LIMNOLOGICAL INVESTIGATION OF TWELVE SOUTHERN AFRICAN GEOTHERMAL WATERS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The ionic composition and algal flora of twelve geothermal waters in southern South West Africa and north-western South Africa are described, many for the first time. Water temperatures ranged from 24,9 to 66 °C and salinity values indicated moderate mineralization...
  9. DIGESTION OF <em>MICROCYSTIS AERUGINOSA</em> BY <em>OREOCHROMIS MOSSAMBICUS</em>

    DIGESTION OF <em>MICROCYSTIS AERUGINOSA</em> BY <em>OREOCHROMIS MOSSAMBICUS</em>

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The mean assimilation efficiency of aquarium acclimatized Oreochromis mossambiaue fed on a diet of Microcystis aeruginosa collected from Hartbeespoort Dam was determined as 50,8% for total organic matter, 63,7% for protein and 75,5% for phosphorus. Transmission electron microscopic examination of...
  10. Female Genital Mutilation: A Human Rights Perspective

    Female Genital Mutilation: A Human Rights Perspective

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    Female Genital Mutilation (FGM) constitutes all procedures that involve partial or total removal of the external female genitalia, or other injury to the female genital organs for cultural or non-therapeutic reasons. The practice remains an extremely complex and culturally sensitive...