Articles by Author: J J Bolton

Search results for J J Bolton

We found 24 results for you
  1. 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...
  2. Suitability of the agarophyte <em>Suhria vittata</em> (L.) J. Ag. (Rhodophyta: Gelidiaceae) for mariculture: geographical distribution, reproductive phenology and growth of sporelings in culture in relation to light and temperature

    Suitability of the agarophyte <em>Suhria vittata</em> (L.) J. Ag. (Rhodophyta: Gelidiaceae) for mariculture: geographical distribution, reproductive phenology and growth of sporelings in culture in relation to light and temperature

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The geographical distribution, reproductive phenology and growth in culture of the subtidal red algal agarophyte Suhria vittata are described. Cystocarpic, male and bisporic thalli are present in nature throughout the year and show no strong seasonality. In the ranges of...
  3. The influence of upwelling on South African west coast seaweeds

    The influence of upwelling on South African west coast seaweeds

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Upwelling from the Benguela Current system on the South African west coast has produced a seaweed flora distinct from that in the region east of Cape Agulhas. The origins of the major red algal component of the West Coast flora...
  4. Potential harvestable biomass of four carrageenan-producing seaweeds of the South-Western Cape, South Africa

    Potential harvestable biomass of four carrageenan-producing seaweeds of the South-Western Cape, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Four species of carrageenophytes were surveyed to determine the harvestable biomass of populations in the South-Western Cape, South Africa. Three species, Aeodes orbitosa, Gigartina polycarpa and Sarcothalia stiriata occur in sufficient quantities to be harvested, with summer fresh mass standing...
  5. Gracilarioid species (Gracilariaceae, Rhodophyta) in southern Africa, with a description of <em>Gracilariopsis funicularis</em> sp. nov.

    Gracilarioid species (Gracilariaceae, Rhodophyta) in southern Africa, with a description of <em>Gracilariopsis funicularis</em> sp. nov.

    Item type: Journal Article • Journal: African Journal of Marine Science
    Southern African gracilarioids have previously been assigned to Gracilaria gracilis and Gracilariopsis lemaneiformis. Recent molecular evidence indicates that at least three gracilarioid species, G. gracilis, Gracilariopsis longissima and an undescribed Gracilariopsis species occur in this region. The main economic species...
  6. Patterns in subtidal seaweed communities on coral-dominated reefs at Sodwana Bay on the KwaZulu-Natal coast, South Africa

    Patterns in subtidal seaweed communities on coral-dominated reefs at Sodwana Bay on the KwaZulu-Natal coast, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Subtidal seaweed communities of the northern coast of KwaZulu-Natal (KZN) have not been studied before. At Sodwana Bay, we tested the hypotheses that the seaweed communities would (1) differ floristically with depth, (2) be more species-rich in shallower water, (3)...
  7. A simple method for rapid estimation of <em>Ecklonia maxima</em> and <em>Laminaria pallida</em> biomass using floating surface quadrats

    A simple method for rapid estimation of <em>Ecklonia maxima</em> and <em>Laminaria pallida</em> biomass using floating surface quadrats

    Item type: Journal Article • Journal: African Journal of Marine Science
    In South Africa two species of kelp, Ecklonia maxima and Laminaria pallida, occur in quantities sufficient for commercial use. Currently, the former species is harvested in large quantities (about 5 000 tonnes wet weight per year) as abalone feed. In...
  8. Molecular evidence for three separate cryptic introductions of the red seaweed <em>Asparagopsis</em> (Bonnemaisoniales, Rhodophyta) in South Africa

    Molecular evidence for three separate cryptic introductions of the red seaweed <em>Asparagopsis</em> (Bonnemaisoniales, Rhodophyta) in South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    The red seaweed genus Asparagopsis Montagne (Bonnemaisoniales) contains two widely introduced species that are considered notorious seaweed invaders worldwide, Asparagopsis armata and A. taxiformis, both characterised by heteromorphic, diplo-haplontic life histories. To uncover cryptic introductions of Asparagopsis along the South...
  9. The seaweeds of Angola: the transition between tropical and temperate marine floras on the west coast of southern Africa

    The seaweeds of Angola: the transition between tropical and temperate marine floras on the west coast of southern Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    The seaweed flora of Angola is relatively poorly known. Most of the 124 records listed for the country come from a 1974 British Natural History Museum expedition to the central and southern parts of that country. Previous biogeographic studies treated...
  10. South African kelp moving eastwards: the discovery of <em>Ecklonia maxima</em> (Osbeck) Papenfuss at De Hoop Nature Reserve on the south coast of South Africa

    South African kelp moving eastwards: the discovery of <em>Ecklonia maxima</em> (Osbeck) Papenfuss at De Hoop Nature Reserve on the south coast of South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Historical and recent evidence is documented to demonstrate that the eastern limit of the major kelp-bed forming seaweed Ecklonia maxima has moved c. 73 km eastward along the south coast of South Africa since 2006, after remaining unchanged for almost...