Articles by Keyword: Genetics

Search results for Genetics

We found 28 results for you
  1. Observations on the linefish resources of Namibia, 1990?2000, with special reference to West Coast steenbras and silver kob

    Observations on the linefish resources of Namibia, 1990?2000, with special reference to West Coast steenbras and silver kob

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The Namibian linefishery is a multisector fishery, with recreational and commercial sectors targeting overlapping species. Prior to 1990, catch data were recorded for the boat sector, but little research was done on the population dynamics of any of the species...
  2. A review of orange roughy <em>Hoplostethus atlanticus</em> fisheries, estimation methods, biology and stock structure

    A review of orange roughy <em>Hoplostethus atlanticus</em> fisheries, estimation methods, biology and stock structure

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Orange roughy Hoplostethus atlanticus are unusual fish. They form dense aggregations that have fuelled lucrative fisheries at great depths (600–1 400 m), especially off Namibia, New Zealand and Australia. They are thought to be very long-lived (>100 years, maturity at...
  3. Genetic and morphological variation of the lanternfish <em>Lampanyctodes hectoris</em> (Myctophiformes: Myctophidae) off southern Africa

    Genetic and morphological variation of the lanternfish <em>Lampanyctodes hectoris</em> (Myctophiformes: Myctophidae) off southern Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Genetic and morphological variation within the southern African population of Lampanyctodes hectoris was analysed. A total of 15 enzymes, encoding 22 isozyme loci, was examined (n = 327); seven were polymorphic. The percentage of polymorphic loci ranged from 13.6 to...
  4. Catchments as conservation units for riverine biodiversity

    Catchments as conservation units for riverine biodiversity

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The geological structure and longitudinal nature of river systems provide a possible barrier to the dispersal of lotic organisms. This has the potential to drive evolutionary processes such as genetic differentiation and subsequent allopatric speciation. In the conservation of lotic...
  5. Conservation genetics of the vulnerable Treur River barb, <em>Barbus treurensis</em>

    Conservation genetics of the vulnerable Treur River barb, <em>Barbus treurensis</em>

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    At present there are only two populations of the vulnerable Treur River barb, Barbus treurensis, in existence; a founder population in the upper Blyde River and a translocated population in the Treur River where the species became extinct. The translocated...
  6. Extreme levels of intra-specific divergence among Cape Peninsula populations of the Cape galaxias, <em>Galaxias zebratus</em> Castelnau 1861, reveals a possible species complex

    Extreme levels of intra-specific divergence among Cape Peninsula populations of the Cape galaxias, <em>Galaxias zebratus</em> Castelnau 1861, reveals a possible species complex

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Cape galaxias, Galaxias zebratus, is part of the paleao-endemic fauna characteristic of the south-western Cape, South Africa, and is the only galaxiid found in continental Africa. A 284-bp fragment of the cytochrome b region of the mtDNA was sequenced...
  7. Bayesian analysis of allozyme markers indicates a single genetic population of kingklip <em>Genypterus capensis</em> off South Africa

    Bayesian analysis of allozyme markers indicates a single genetic population of kingklip <em>Genypterus capensis</em> off South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Kingklip Genypterus capensis inhabit deep continental shelf and slope waters off southern Africa and are now largely harvested as a bycatch in trawl and longline fisheries for Cape hakes Merluccius spp. Regional differences in growth, vertebral count and otolith morphology...
  8. Observations of individual humpback whales utilising multiple migratory destinations in the south-western Indian Ocean

    Observations of individual humpback whales utilising multiple migratory destinations in the south-western Indian Ocean

    Item type: Journal Article • Journal: African Journal of Marine Science
    Movements of humpback whales Megaptera novaeangliae among breeding regions within the southwestern Indian Ocean are poorly understood. Understanding the relationships among breeding regions is critical for effective conservation and management strategies. Through systematic comparisons of molecular genotypes and both systematic...
  9. Significant population genetic structuring of the holoplanktic scyphozoan <em>Pelagia noctiluca</em> in the Atlantic Ocean

    Significant population genetic structuring of the holoplanktic scyphozoan <em>Pelagia noctiluca</em> in the Atlantic Ocean

    Item type: Journal Article • Journal: African Journal of Marine Science
    Pelagia noctiluca is thought to have a global distribution, yet our understanding of genetic connectivity across the range of this problem animal is poor. Here, we investigate the genetic structure of populations off southern Africa using mitochondrial COI and nuclear...
  10. Genetic characterisation of oyster populations along the north-eastern coast of Tunisia

    Genetic characterisation of oyster populations along the north-eastern coast of Tunisia

    Item type: Journal Article • Journal: African Journal of Marine Science
    The taxonomy of oysters has been traditionally based on characteristics of the shell. More recently, the analysis of protein and DNA polymorphism has provided a means to overcome difficulties in distinguishing the different species of oysters based solely on shell...