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A COMPARISON OF ALLOZYME HETEROZYGOSITY AND LIFE HISTORY VARIABLES IN FOUR STRAINS OF AFRICAN CATFISH (CLARIAS GARIEPINUS)
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: J. P. Grobler --- , , L. C. Hoffman --- , , South Africa J. F. Prinsloo --- , , South AfricaWe studied allozyme polymorphism and its relation to morphological characteristics in 122 individuals from four lines of African catfish. Starch gel electrophoresis was used to screen 26 loci, of which five were polymorphic. Average heterozygosity levels differed moderately among lines... -
A PRELIMINARY BIOCHEMICAL GENETIC STIJDY OF TWO POPULATIONS OF LITHOGNATHUS AURETI (PERCIFORMES: SPARIDAE)
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: F. H. van der Bank --- , , South Africa J. A. Holtzhausen --- , NamibiaTwo populations of Lithognathus aureti were electrophoretically analysed to determine the extent of genetic divergence between, and variation within them. Gene products of 35 protein coding loci showed no fixed allele differences between these populations. However, significant genotypic differentiation between... -
GENETIC VARIATION IN TWO POPULATIONS OF THE ORANGE ROUGHY (HOPLOSTETHUS ATLANTIC US) FROM NAMIBIA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: N. S. Flint --- , , South Africa F. H. van der Bank --- , , South Africa P. J. Theron --- , , South Africa A. Staby --- , NamibiaThe orange roughy (Hoplostethus atlanticus) is a relatively new commercially exploited fish species, but it is currently ranked third amongst the world's top five seafood products. Gene products of 22 protein coding loci in two populations off the coast of... -
Phylogenetic relationships between Synodontis species: some preliminary results
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EE Bruwer FH van der Bank GJ Steyn M WinkThe aim of this study was to identify genetic markers and morphological characters to distinguish Synodontis species, because certain species are extremely difficult to identify due to the taxonomically unreliable nature of prominent morphological features. Fixed allele mobility differences were... -
Genetic varaiation within and differentiation between Pseudobarbus quathlambae (Pisces, Cyprinidae) populations from the Senqunyane, Jordane and Bokong Rivers (Central Lesotho)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FH van der Bank JL Rall GJ SteynHorizontal starch-gel electrophoresis was used to obtain baseline genetic information on critically endangered Pseudobarbus quathlambae populations in the Senqunyane, Jordane and Bokong Rivers in the Lesotho Highlands. Allelic frequencies were similar between the populations and generations studied. However, allele classes... -
Phylogeography of the African catfish, Chrysichthys maurus (Valenciennes, 1839)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J-F AgnèsePolymorphism at 19 allozyme loci was studied in 227 individuals of the catfish, Chrysichthys maurus (Valenciennes, 1839), collected from ten populations representing nine different river basins in west Africa. Eleven of the loci studied were polymorphic. Analysis showed that populations... -
Phylogenetic relationships between some African Characidae, Disticho-dontidae and Hepsetidae: results of allozyme and mtDNA data analyses
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FH van der Bank A Kotzé TM FalkThe present study considers phylogenetic relationships of some southern, eastern and western African Characidae, Distichodontidae and Hepsetidae species, for which only limited genetic data with respect to their classification and phylogeny are currently available. Thirteen species representing three families and... -
Population genetic structure of the sidespot barb, Barbus neefi, from the north-eastern escarpment, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GD Engelbrecht --- Discipline of Physiology, South Africa P FS Mulder --- Discipline of Physiology, South Africa JS Engelbrecht --- , South AfricaAllozyme analysis was used to determine patterns of genetic variation within and between populations of Barbus neefi. The products of 29 loci were analysed, with 17 loci being monomorphic in all populations. The genetic variability estimates compared well with values... -
Is caudal fin colour in tigerfish Hydrocynus vittatus a sex or population trait?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Soekoe --- Centre for Aquatic Research, Department of Zoology, South Africa FH van der Bank --- African Centre for DNA Barcoding, Department of Zoology, South Africa NJ Smit --- Water Research Group (Ecology), Unit for Environmental Sciences and Management, Potchefstroom Campus, South AfricaTigerfish caudal fin colours vary from yellow to red, with distinct dissimilarities previously noted. To understand these colour differences, tigerfish were collected during 2008 to 2010 from four southern African populations in the Upper Zambezi River (ZAM), Okavango Delta (OKA),... -
Bayesian analysis of allozyme markers indicates a single genetic population of kingklip Genypterus capensis off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WS Grant RW LeslieKingklip 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... -
Evolutionary relationships of Slash Pine (Pinus elliottii) with its temperate and tropical relatives
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: R C Schmidtling --- USDA Forest Service, SRS, USA V Hipkins --- USDA Forest Service, USAAllozymes in bud tissue and monoterpene contents in xylem oleoresin of slash pine (Pinus elliottii) were analyzed from populations across the natural distribution, as well as those from other species in the AUSTRALES pines. Allozyme diversity measures of slash pine... -
Increased backcrossing has reduced the usefulness of morphological and allozyme data for identifying Oreochromis niloticus, O. mossambicus (Teleostei: Cichlidae) and their hybrids in the Pafuri reach of the Luvuvhu River in the Kruger National Park, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FH van der Bank AR DeaconAlien Oreochromis niloticus, indigenous O. mossambicus and individuals that appeared hybrid-like were sampled from the Luvuvhu River, a tributary of the Limpopo, near Pafuri in the Kruger National Park. Starch gel electrophoresis of muscle tissues and the resolution of protein... -
A preliminary study of allozyme differences amongst Carcharhinus sharks from the continental slope near Abidjan, Côte d'lvoire
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Béatrice Adepo-Gourène Lounès Chikhi Jean-François Agnèse Germain Gourène Alain HervéGenetic variability of fifty-five shark specimens from the genus Carcharhinus was analysed using 18 allozyme loci. Sixteen loci were polymorphic either within, or between, species. Levels of genetic polymorphism, as measured by observed heterozygosity values, ranged from 0.008 (±0.008) to... -
Does Serranochromis altus (Teleostei: Cichlidae) exist in the Okavango Delta, Botswana?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FH van der Bank M Wink M Soekoe N SmitTwo possibly synonymous fish species in the Okavango Delta, Botswana, Serranochromis altus and S. angusticeps, were compared. Ecological data, morphometrics, meristics, allozymes, and genomic fingerprints — generated with six Inter-Simple Sequence Repeat (ISSR) analyses, and DNA barcoding primers — were... -
High genetic homogeneity of the moon jelly Aurelia aurita (Scyphozoa, Semaeostomeae) along the Mediterranean coast of Tunisia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AR Ben Faleh A Ben Othmen T Deli A Annabi K SaidThe moon jelly Aurelia aurita is one of the most common and widespread species of scyphomedusa in the Mediterranean Sea. In all, 18 allozyme loci were studied to investigate the genetic variation and population structure of 11 A. aurita populations... -
Phenotypic plasticity and local adaptation in two extreme populations of Acacia karroo
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G Bayonne Mboumba D WardPhenotypic plasticity is the effect of growth variability in response to different environmental conditions. Adaptive phenotypic plasticity is more specific; it is the ability of a single genotype to produce an array of phenotypes depending on the environmental extent. We... -
Genetic variability of South African fiscal shrikes (Lanius collaris) across an altitudinal gradient
Item type: Journal Article • Journal: African Zoology • Authors: S. Soobramoney --- School of Biological & Conservation Sciences, University of KwaZulu-Natal, South Africa G.K. Campbell --- School of Life and Environmental Sciences, University of KwaZulu-Natal, South Africa C.T. Downs --- School of Biological & Conservation Sciences, University of KwaZulu-Natal, South Africa N.J. Adams --- School of Biological & Conservation Sciences, University of KwaZulu-Natal, South AfricaAn electrophoretic allozyme study of the fiscal shrike Lanius collaris, a widely distributed sub-Saharan passerine, was undertaken to investigate altitudinal variation in genetic structure within this species. It is a sedentary bird with limited dispersal so that subpopulations may be... -
Enzyme structure, enzyme function and allozyme diversity in mammals: trends from South African population genetic studies
Item type: Journal Article • Journal: African Zoology • Authors: J. P. Grobler --- Department of Biodiversity, South AfricaIn estimates of population genetic diversity based on allozyme heterozygosity, some enzymes are regularly more variable than others. Evolutionary theory suggests that functionally less important molecules, or parts of molecules, evolve more rapidly than more important ones; the latter enzymes... -
A biochemical genetic comparison of four populations of Breviceps adspersus (Anura: Microhylidae)
Item type: Journal Article • Journal: African Zoology • Authors: G.D. Engelbrecht --- Department of Physiology, South Africa P.F.S. Mulder --- Department of Physiology, South AfricaFour populations of the bushveld rain frog, Breviceps adspersus, representing three northern populations (B. adspersus adspersus), and a southern population (B. adspersus pentheri), were analysed by electrophoresis to assess the extent of genetic variation and differentiation amongst them. Eighteen protein-coding... -
Patterns of genetic heterogeneity in Neutraclinostomum intermedialis (Digenea: Clinostomatidae): geographical and temporal considerations
Item type: Journal Article • Journal: African Zoology • Authors: J.P Grobler [AN0001] N.M. Mokgalong --- School of Molecular and Life Sciences, South AfricaApproximately 300 individuals of Neutraclinostomum intermedialis from three localities in the Northern Province of South Africa were screened using allozyme electrophoresis. The aim was to determine genetic diversity and divergence within and between populations. The within population heterozygosity values (H...