Articles by Keyword: Community Structure

Search results for Community Structure

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  1. POPULATION DYNAMICS AND DEMOGRAPHY OF AN ESTUARINE COPEPOD (<em>PSEUDODIAPTOMUS EESSEI</em>) IN LAKE SIBAYA, A SUBTROPICAL FRESHWATER COASTAL LAKE

    POPULATION DYNAMICS AND DEMOGRAPHY OF AN ESTUARINE COPEPOD (<em>PSEUDODIAPTOMUS EESSEI</em>) IN LAKE SIBAYA, A SUBTROPICAL FRESHWATER COASTAL LAKE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Population size and stage structure of Pseudodiaptomus hessei (Mrázek) was studied over 27 months at a single site in subtropical Lake Sibaya. Population density varied seasonally from about 1 to 4 individuals per litre, but a fairly stable population structure...
  2. STUDIES ON THE ZOOBENTHOS OF SOME SOUTHERN CAPE COASTAL LAKES. SPATIAL AND TEMPORAL CHANGES IN THE BENTHOS OF SWARTVLEI, SOUTH AFRICA, IN RELATION TO CHANGES IN THE SUBMERGED LITTORAL MACROPHYTE COMMUNITY

    STUDIES ON THE ZOOBENTHOS OF SOME SOUTHERN CAPE COASTAL LAKES. SPATIAL AND TEMPORAL CHANGES IN THE BENTHOS OF SWARTVLEI, SOUTH AFRICA, IN RELATION TO CHANGES IN THE SUBMERGED LITTORAL MACROPHYTE COMMUNITY

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Major changes in the benthic macro-invertebrate community of the littoral zone of Swartvlei, South Africa, took place between January and April 1978, and the equivalent months of 1980. These changes, which were associated with a collapse of the submerged littoral...
  3. OBSERVATIONS ON TEMPORAL TRENDS IN PHYTOPLANKTON DIVERSITY IN THE VAAL RIVER AT BALKFONTEIN, SOUTH AFRICA

    OBSERVATIONS ON TEMPORAL TRENDS IN PHYTOPLANKTON DIVERSITY IN THE VAAL RIVER AT BALKFONTEIN, SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Phytoplankton diversity in the Vaal River at Balkfontein from March to October 1984 was investigated by employing different diversity indices. Most diversity indices showed appreciable variation during the study period indicating specific temporal trends. Greatest diversity was demonstrated for warmer...
  4. HUMAN ACTIVITIES AND FACTORS AFFECTING THE DISTRIBUTION OF MACROBENTHIC FAUNA IN SALDANHA BAY

    HUMAN ACTIVITIES AND FACTORS AFFECTING THE DISTRIBUTION OF MACROBENTHIC FAUNA IN SALDANHA BAY

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The most recent trends in the economic development of Saldanha Bay are towards the tourist and mariculture industries, both of which are dependent on a high quality of water. Yet this water quality is now under threat. In this study,...
  5. ASPECTS OF COMPARATIVE PLANKTON ECOLOGY IN CASCADING MGENI RIVER RESERVOIRS (MIDMAR, ALBERT FALLS, AND NAGLE): AN OVERVIEW

    ASPECTS OF COMPARATIVE PLANKTON ECOLOGY IN CASCADING MGENI RIVER RESERVOIRS (MIDMAR, ALBERT FALLS, AND NAGLE): AN OVERVIEW

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    An overview of a three year study of abundance, community structure and succession of zooplankton and phytoplankton in relation to physical limnological conditions in Lakes Midmar and Albert Falls is presented, along with findings on zooplankton from a nine month...
  6. A LIMNOLOGICAL SYNOPSIS OF BHANGAZI SOUTH, A DYSTROPHIC COASTAL LAKE IN THE GREATER ST LUCIA WETLAND PARK (KWAZULU/NATAL), WITH COMMENTS ON ITS CONSERVATION VALUE.

    A LIMNOLOGICAL SYNOPSIS OF BHANGAZI SOUTH, A DYSTROPHIC COASTAL LAKE IN THE GREATER ST LUCIA WETLAND PARK (KWAZULU/NATAL), WITH COMMENTS ON ITS CONSERVATION VALUE.

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Base-line limnological and biological data are given for Lake Bhangazi South, a small lake on the coastal plain of Kwazulu-Natal, South Africa. This shallow (Zmax < 6 m), subtropical lake is a warm and seemingly continuously polymictic system, but experiences...
  7. The effect of largemouth bass <em>Micropterus salmoides</em> on aquatic macro-invertebrate communities in the Wit River, Eastern Cape, South Africa

    The effect of largemouth bass <em>Micropterus salmoides</em> on aquatic macro-invertebrate communities in the Wit River, Eastern Cape, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Fish predation is one of the driving forces of freshwater invertebrate community structures, with alien predators having a pronounced effect. A quantitative assessment of aquatic invertebrates in the Wit River, Sundays River catchment, Eastern Cape, South Africa, was undertaken to...
  8. The influence of pool size on species diversity and water chemistry in temporary rock pools on Domboshawa Mountain, northern Zimbabwe

    The influence of pool size on species diversity and water chemistry in temporary rock pools on Domboshawa Mountain, northern Zimbabwe

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The effect of pool size (area and depth) on species diversity and physicochemical characteristics of rock pool habitats on Domboshawa Mountain, northern Zimbabwe, was studied from December 2006 to May 2007. Pools were categorised based on maximum depth. Pool duration...
  9. Effects of 17-α-estradiol on a free-living marine nematode community: a microcosm experiment

    Effects of 17-α-estradiol on a free-living marine nematode community: a microcosm experiment

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    A microcosm experiment was used to examine the effects of 17-α-estradiol on a nematode community. Four 17-α-estradiol concentrations (0.15, 0.31, 0.62 and 1.24 ppm) were tested, and effects were examined after 30 days. Significant differences were noted between nematode assemblages...
  10. Effects of fishing on the size and dominance structure of linefish of the Cape region, South Africa

    Effects of fishing on the size and dominance structure of linefish of the Cape region, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    A dataset of linefish catch, effort and fish size distribution records has been assembled from archives to cover three short periods over the 100 years from 1897 to 1998 in four regions of the former Cape Colony, South Africa. Linefish...