Articles by Keyword: Back Calculation

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  1. Age and growth of the common blacktip shark <em>Carcharhinus limbatus</em> from Indonesia, incorporating an improved approach to comparing regional population growth rates<xref ref-type="fn" rid="FN0001"/>

    Age and growth of the common blacktip shark <em>Carcharhinus limbatus</em> from Indonesia, incorporating an improved approach to comparing regional population growth rates<xref ref-type="fn" rid="FN0001"/>

    Item type: Journal Article • Journal: African Journal of Marine Science
    Age and growth estimates from length‑at‑age data were produced for the common blacktip shark Carcharhinus limbatus from Indonesia. Back‑calculation techniques were used due to a low sample size (n = 30), which was dominated by large, mature sharks. A multi‑model...
  2. Age and growth of narrow-barred Spanish mackerel <em>Scomberomorus commerson</em> in the coastal waters of southern Mozambique and KwaZulu-Natal, South Africa

    Age and growth of narrow-barred Spanish mackerel <em>Scomberomorus commerson</em> in the coastal waters of southern Mozambique and KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    The narrow-barred Spanish mackerel Scomberomorus commerson is one of the most important linefish species caught in KwaZulu-Natal and southern Mozambique waters, forming the basis of important commercial, artisanal and recreational fisheries. A total of 439 S. commerson were sampled along...
  3. Decline and Mortality of <em>Ocotea bullata</em> Trees in the Southern Cape Forests

    Item type: Journal Article • Journal: South African Forestry Journal
    Dying trees of Ocotea bullata (Lauraceae) occurred in small groups in certain areas in the medium-moist forests of the southern Cape. Crown health declined significantly (P > 0,01) in the dying groups, but this was not the general trend for...
  4. ASPECTS OF THE BIOLOGY OF TILAPIA RENDALLI IN THE DOORNDRAAI DAM TRANSVAAL

    ASPECTS OF THE BIOLOGY OF TILAPIA RENDALLI IN THE DOORNDRAAI DAM TRANSVAAL

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Scale studies indicated that the annulus is a reliable year mark. A linear relationship existed between scale radius and body growth enabling back calculations to be made. The growth rate of males in Doorndraai Dam were similar to findings in...
  5. Fire and the dynamics of a semi-arid grassland: influence on soil characteristics

    Fire and the dynamics of a semi-arid grassland: influence on soil characteristics

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The short-term impact of fire burning with the wind (head fire) and against the wind (back fire) on soil characteristics (soil-water content, soil compaction, soil temperature, organic matter, pH, exchangeable Ca, Mg, K, Na and extractable P) were determined in...
  6. Fire and the dynamics of semi-arid grassland: influence on plant survival, productivity and water-use efficiency

    Fire and the dynamics of semi-arid grassland: influence on plant survival, productivity and water-use efficiency

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    There is a lack of knowledge concerning the effect of fire behaviour on the vegetation dynamics of semi-arid climates. Arising from this, an investigation was initiated to characterise the behaviour of fires burning with the wind (head fire) and against...
  7. Short-term response of burnt grassland to defoliation in a semi-arid climate of South Africa

    Short-term response of burnt grassland to defoliation in a semi-arid climate of South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The impact of defoliation on the productivity and soil temperature of burnt grassland (head and back fires) was investigated over the short term (one and two growing seasons after burning). Head fires had greater flame height and rate of spread...
  8. Die-back of kiaat (<em>Pterocarpus angolensis</em>) in southern Africa: a cause for concern?

    Die-back of kiaat (<em>Pterocarpus angolensis</em>) in southern Africa: a cause for concern?

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Pterocarpus angolensis (kiaat) is a well-known southern African tree species of commercial importance that occurs in several vegetation types in the Zambezian regional centre of endemism. The most prominent of these vegetation types are the Zambezian miombo woodland and undifferentiated...
  9. Heritability of shoot die-back and root biomass in sixteen <em>Pterocarpus angolensis</em> (Fabaceae) half-sib families from Malawi, Namibia and Zambia

    Heritability of shoot die-back and root biomass in sixteen <em>Pterocarpus angolensis</em> (Fabaceae) half-sib families from Malawi, Namibia and Zambia

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The experiment was conducted to ascertain narrow-sense heritability (h 2) and the family-within-provenance variation in shoot die-back, taproot length and root biomass of half-sib Pterocarpus angolensis families from Malawi, Namibia and Zambia. Provenances differed significantly in shoot die-back for both...
  10. A diverse assemblage of Botryosphaeriaceae infect <em>Eucalyptus</em> in native and non-native environments

    A diverse assemblage of Botryosphaeriaceae infect <em>Eucalyptus</em> in native and non-native environments

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The Botryosphaeriaceae cause endophytic infections of leaves and bark of various trees, including Eucalyptus, and they apparently persist in this state for extended periods of time. Under conditions of stress, these fungi cause many different disease symptoms on Eucalyptus, of...