Articles by Keyword: Stable Isotope Ratios

Search results for Stable Isotope Ratios

We found 49 results for you
  1. Protected nearshore shallow and deep subtidal rocky reef communities differ in their trophic diversity but not their nutritional condition

    Protected nearshore shallow and deep subtidal rocky reef communities differ in their trophic diversity but not their nutritional condition

    Item type: Journal Article • Journal: African Journal of Marine Science
    Large physical changes that alter reef macrobenthos and fish assemblages occur with increasing depth, so the biological processes that regulate communities at different depths are expected to diverge. We used analyses of stable isotopes (δ13C and δ15N) and fatty acids...
  2. Stable isotope (∂<sup>13</sup>C) composition of the food web of the temperate Kariega estuary (Eastern Cape)

    Stable isotope (∂<sup>13</sup>C) composition of the food web of the temperate Kariega estuary (Eastern Cape)

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Stable isotope (∂13C) composition of the food web in the temperate Kariega estuary in summer and winter was analysed to determine the trophic relationships between 19 taxa. There was no seasonality in the stable isotope ratios of the dominant producers...
  3. Nature of suspended particulate matter and concentrations of heavy metals in sediment in the southern part of Lake Victoria, East Africa

    Nature of suspended particulate matter and concentrations of heavy metals in sediment in the southern part of Lake Victoria, East Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The concentrations of metals in bottom sediment in the Tanzanian waters of Lake Victoria and the nature of suspended particulate matter (SPM) were analysed. The objective of the study was to compare levels of metals in sediment from different locations...
  4. The status of the Damara Tern in the Eastern Cape, South Africa

    The status of the Damara Tern in the Eastern Cape, South Africa

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The Eastern Cape population of the Damara Tern Sternula balaenarum was estimated to be 25–29 pairs in the 2008/09 and 2009/10 breeding seasons. The population appears to be stable and has probably increased slightly since the early 1990s. An eastward...
  5. Trophic ecology and persistence of invasive silver carp <em>Hypophthalmichthys molitrix</em> in an oligotrophic South African impoundment

    Trophic ecology and persistence of invasive silver carp <em>Hypophthalmichthys molitrix</em> in an oligotrophic South African impoundment

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The alien invasive silver carp Hypophthalmichthys molitrix established a self-sustaining feral population in an oligotrophic impoundment, Flag Boshielo Dam, in South Africa. The ability of this population to persist in a dam with low algal biomass (median annual suspended chlorophyll...
  6. Ecology and behaviour of Palm-nut Vultures <em>Gypohierax angolensis</em> in the Bijagós Archipelago, Guinea-Bissau<xref ref-type="fn" rid="FN0001"/>

    Ecology and behaviour of Palm-nut Vultures <em>Gypohierax angolensis</em> in the Bijagós Archipelago, Guinea-Bissau<xref ref-type="fn" rid="FN0001"/>

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Populations of many vulture species have undergone substantial declines. In Africa, 82% are threatened and although research on vultures has increased, the biology and ecology of several species is still poorly known. The Palm-nut Vulture Gypohierax angolensis has peculiar ecological...
  7. Determination of water quality, and trace metals in endemic <em>Sarotherodon linellii</em>, <em>Pungu maclareni</em> and <em>Clarias maclareni</em>, in crater Lake Barombi Mbo, Cameroon

    Determination of water quality, and trace metals in endemic <em>Sarotherodon linellii</em>, <em>Pungu maclareni</em> and <em>Clarias maclareni</em>, in crater Lake Barombi Mbo, Cameroon

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Considering water pollution as a potential threat to some endemic cichlids of Lake Barombi Mbo, Cameroon, an investigation was done in 2011 to determine trace metals in its water, linking their uptake in gills and liver of fish to water...
  8. Wintertime rates of net primary production and nitrate and ammonium uptake in the southern Benguela upwelling system

    Wintertime rates of net primary production and nitrate and ammonium uptake in the southern Benguela upwelling system

    Item type: Journal Article • Journal: African Journal of Marine Science
    The elevated levels of primary productivity associated with eastern boundary currents are driven by nutrient- rich waters upwelled from depth, such that these regions are typically characterised by high rates of nitrate-fuelled phytoplankton growth. Production studies from the southern Benguela...
  9. A critical analysis of veld management recommendations for sourveld in the south‐eastern Transvaal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Surveys have shown that the grazing value of veld in the south‐eastern Transvaal is well below the estimated potential. Extension efforts aimed at rectifying the situation have been unsuccessful in that most recommendations have not been acceptable to producers. An...
  10. Growth and nutrient content of soybeans in relation to solution calcium and aluminium

    Growth and nutrient content of soybeans in relation to solution calcium and aluminium

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Aluminium (Al) is a major component of most soils and is a limiting factor to sustained crop production in many regions. The amelioration of Al toxicity is of theoretical as well as practical interest in our understanding of mechanisms of...