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Changes in abundance of the northern Benguela sardine stock during the decade 1990–2000, with comments on the relative importance of fishing and the environment
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: D. C. Boyer H. J. Boyer I. Fossen A. KreinerThe northern Benguela stock of sardine Sardinops sagax used to be considered one of the major clupeoid stocks of the world; it supported an average annual catch of >700 000 tons throughout the 1960s. The stock has been in a... -
Interaction between Cape hake spawning and the circulation in the northern Benguela upwelling ecosystem
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: S. Sundby A. J. Boyd L. Hutchings M. J. O'Toole K. Thorisson A. ThorsenCape hake in Namibian waters are demersal and mesopelagic spawners, spawning peaking offshore between 100 and 400 m deep, depending on local environmental conditions. The cross-shelf circulation, low-oxygen layers and mesoscale gyres are three important environmental factors influencing hake spawning... -
Reproduction and recruitment patterns of the surf clam Donax serra (Bivalvia, Donacidae) on two Namibian sandy beaches
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. Laudien T. Brey W. E. ArntzReproduction and recruitment of the surf clam Donax serra on two Namibian beaches were studied over a period of two years. Histological examination of the gonads indicated a discontinous annual reproductive cycle, related to monthly mean sea surface temperature. The... -
AN ASSESSMENT OF THE GROWTH RATE OF MPASA, OPSABIDIUM MICROLEPIS (GUNTHER, 1864) (PISCES: CRYPRINIDAE), BY LENGTH FREQUENCY ANALYSIS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D. Tweddle --- Fisheries Department, MalawiThe mpasa, Opsaridium microlepis, is an important commercial species in areas of Lake Malawi near major inflowing rivers during annual spawning migrations. Plots of length frequency data collected over a series of years from mpasa catches in the Bua and... -
COMPOSITION, ABUNDANCE AND SEASONALITY OF LARVAL FISH IN RICHARDS BAY HARBOUR, KWAZULU-NATAL, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: S. A. Harris --- , , South Africa D. P. Cyrus --- , , South AfricaThe present study examined the composition, abundance and seasonality of fish larvae occurring in Richards Bay Harbour, over an 18-month period from June 1991 to November 1992. Ichthyoplankton samples were collected every six weeks at top, mid and bottom depths... -
Soil seed bank evaluation and seedling establishment along a degradation gradient in a semi-arid rangeland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: HA SnymanThe effects of rangeland degradation on the size and species composition of the seed bank and seedling establishment in the field were quantified over a two year period (2000–2001 and 2001–2002 growing seasons). Soil seed bank sampling was carried out... -
Impact of sustained drought on a semi‐arid Colophospermum mopane savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: T.G. O'Connor --- Department of Range and Forage Resources, Republic of South AfricaVegetation change on different substrate types was measured over 15 years in semi‐arid Mopani Veld. Baseline data were collected in the terminal year (1982) of a decade of above‐average rainfall, whilst the period of monitoring was characterised by below‐average rainfall,... -
The icthyofauna of the Mhlathuze coastal lakes: some preliminary results
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SP Weerts DP CyrusThe fish faunas of the four Mhlathuze coastal lakes and the lower river comprise a diverse assortment of over fifty marine, estuarine and freshwater species. Three freshwater species are endemic to KwaZulu-Natal and nine estuarine species are endemic to southern... -
Juvenile fish recruitment through wave-overtopping into a closed subtropical estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Vivier DP CyrusThe fish fauna of the subtropical Nhlabane estuary in northern KwaZulu-Natal was studied during a regional drought over the period 1991–1995. The estuary mouth closed in late 1991, due to the drought and to water abstraction from the system, and... -
Diel and tidal variations in larval fish exchange in the mouth region of the Gamtoos Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Strydom TH WooldridgeDiel and tidal variations in density of larval fishes were monitored over one neap and one spring tidal cycle in the mouth region of the warm temperate Gamtoos Estuary, South Africa. Data were collected over two 24h periods, using mixed... -
Fish assemblages in the Mfolozi–Msunduzi estuarine system, KwaZulu-Natal, South Africa, when not linked to the St Lucia mouth
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Vivier --- Coastal Research Unit of Zululand, Department of Zoology, South Africa DP Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa RK Owen --- Coastal Research Unit of Zululand, Department of Zoology, South Africa HL Jerling --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaThe fish community of the Mfolozi–Msunduzi estuarine system was investigated with particular emphasis on its role as a nursery area for marine fish when the adjacent St Lucia mouth is closed. The mouth was open during March 2007 and 2008... -
Ostrich recruitment dynamics in relation to rainfall in the Mara–Serengeti ecosystem
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: JosephO Ogutu --- Institute of Crop Science, Germany Hans-Peter Piepho --- Institute of Crop Science, Germany HollyT Dublin --- Species Survival Commission, International Union for Conservation of Nature and Natural Resources, c/o Centre for Biodiversity Conservation, South AfricaAnimal population dynamics can be driven by rainfall variability through its influence on habitat suitability, availability and nutritional sufficiency of forage. To understand how rainfall influences ostriches, we related changes in ostrich recruitment in the Mara–Serengeti ecosystem to rainfall. Over... -
Growth of Seven-weeks Fern (Rumohra adiantiformis) in the Southern Cape Forests: Implications for Management
Item type: Journal Article • Journal: South African Forestry Journal • Authors: SuzanneJ. Milton --- Botany Department,Fronds of the fern Rumohra adiantiformis are picked in the southern Cape forests and exported. Harvested fern rhizomes produce smaller fronds. Recruitment of juvenile plants to a marketable size class, and recovery in frond size of experimentally defoliated fern rhizomes... -
AN ASSESSMENT OF THE GROWTH RATE OF MPASA, OPSABIDIUM MICROLEPIS (GUNTHER, 1864) (PISCES: CRYPRINIDAE), BY LENGTH FREQUENCY ANALYSIS
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: D. Tweddle --- Fisheries Department, MalawiThe mpasa, Opsaridiwm microlepis, is an important commercial species in areas of Lake Malawi near major inflowing rivers during annual spawning migrations. Plots of length frequency data collected over a series of years from mpasa catches in the Bua and... -
Drift Patterns of Anchovy Engraulis Capensis Larvae in The Southern Benguela, and Their Possible Importance for Recruitment
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M. D. Skogen L. J. Shannon J. E. StiansenIn the southern Benguela, successful recruitment of Cape anchovy Engraulis capensis is highly variable and seems to be dependent on the spawning biomass only to a small extent. This paper investigates how the variations in the drift patterns of larvae... -
A Statistical Model for Stock Assessment of Southern Bluefin Tuna with Temporal Changes in Selectivity
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D. S. Butterworth J. N. Ianelli R. HilbornAssessment of the status of southern bluefin tuna (SBT) by Australia and Japan has used a method (ADAPT) that imposes a number of structural restrictions, and is similar to methods used for a number of stocks world-wide. A flexible method... -
Limits to the use of environmental indices to reduce risk and/or increase yield in the South African anchovy fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JAA De Oliveira DS ButterworthEnvironmental indices that provide short-term predictions of recruitment have the potential to improve the average yield from highly productive resources that sustain recruit fisheries without an associated increase in risk (of resource 'collapse'). This is particularly true for cases where... -
Towards the development of an environmental rule-based model for predicting recruitment in Brazilian sardine Sardinella brasiliensis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Jablonski LFL LegeyA rule-based model was built in order to analyse the effects of environmental variables (wind stress, Ekman transport, turbulence, and sea surface temperature [SST]) on the recruitment of the Brazilian sardine Sardinella brasiliensis. The purpose of modelling was (1) to... -
Influence of oceanographic fronts and low oxygen on the distribution of ichthyoplankton in the Benguela and southern Angola currents
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: W Ekau HM VerheyeThe study focuses on ichthyoplankton populations in the southern Angola Current, the Angola-Benguela Front and the coastal upwelling area of the northern and central Benguela Current. The horizontal and vertical distributions of eggs and larvae of sardine Sardinops sagax, anchovy... -
First Lagrangian ROMS–IBM simulations indicate large losses of chokka squid Loligo reynaudii paralarvae from South Africa's Agulhas Bank
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ Roberts --- Department of Environmental Affairs, South Africa C Mullon --- , FrancePresent knowledge of ocean currents based on in situ observation and models suggests that passive biological material such as eggs and larvae can be advected offshore away from the Agulhas Bank, South Africa, and hence removed from the ecosystem on... -
Settlement patterns, size and growth of puerulus and juvenile rock lobster Jasus lalandii at an oyster farm in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Groeneveld --- , South Africa CL Greengrass --- Marine Biology Research Institute, Department of Zoology, South Africa DL van Zyl --- Branch Fisheries, Department of Agriculture, Forestry and Fisheries, South Africa GM Branch --- Marine Biology Research Institute, Department of Zoology, South AfricaTrends in the abundance, size and growth of newly settled pueruli and early juveniles of the rock lobster Jasus lalandii were determined from samples obtained from mesh bags used for oyster mariculture in Saldanha Bay, South Africa. Totals of 3... -
Assessment of current data for the octopus resource in Rodrigues, western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WHH Sauer --- Department of Ichthyology and Fisheries Science, South Africa W Potts --- Department of Ichthyology and Fisheries Science, South Africa D Raberinary --- , UK J Anderson --- , Mauritius MJ Sylvio Perrine --- , RodriguesThe annual catch of octopus in the Rodrigues Lagoon, located east/north-east of Mauritius, has dropped by almost half since 1994. This has prompted concern over the resource and has initiated an assessment of the current status of the stock. The... -
Temporal and spatial patterns in the abundance of jellyfish in the northern Benguela upwelling ecosystem and their link to thwarted pelagic fishery recovery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Flynn --- Department of Biodiversity and Conservation Biology, South Africa AJ Richardson --- Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, Australia AS Brierley --- Pelagic Ecology Research Group, Scottish Oceans Institute, UK DC Boyer --- National Marine Information and Research Centre (NatMIRC), Namibia BE Axelsen --- , Norway L Scott --- , South Africa NE Moroff --- National Marine Information and Research Centre (NatMIRC), Namibia PI Kainge --- National Marine Information and Research Centre (NatMIRC), Namibia BM Tjizoo --- National Marine Information and Research Centre (NatMIRC), Namibia MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaThere has been debate in the literature about whether jellyfish abundance has increased in the northern Benguela upwelling system, or not, over the past five decades and what impact they are having on pelagic fish. Here we review old expedition... -
Population dynamics of the seabob shrimp Xiphopenaeus kroyeri (Dendrobranchiata, Penaeidae) in south-eastern Brazil
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GS Heckler --- Departamento de Ecologia, Instituto de Biociências, Brazil SM Simões --- LABCAM (Laboratório de Biologia de Camarões Marinhos e de Água Doce), Departamento de Ciências Biológicas, Faculdade de Ciências, Brazil APF Santos --- LABCAM (Laboratório de Biologia de Camarões Marinhos e de Água Doce), Departamento de Ciências Biológicas, Faculdade de Ciências, Brazil A Fransozo --- Departamento de Zoologia, Instituto de Biociências, Brazil RC Costa --- LABCAM (Laboratório de Biologia de Camarões Marinhos e de Água Doce), Departamento de Ciências Biológicas, Faculdade de Ciências, BrazilThe population dynamics, including the sex ratio, reproductive period, individual growth and longevity, and population structure of the shrimp Xiphopenaeus kroyeri, are described. The shrimps were collected monthly from July 2005 to June 2007 at four sites in Ubatuba Bay,... -
Seedling recruitment of Colophospermum mopane on the Highveld of Zimbabwe
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: D. Mlambo --- Department of Forest Resources and Wildlife Management, Zimbabwe P. Nyathi --- Department of Forest Resources and Wildlife Management, ZimbabweFactors controlling seedling recruitment of Colophospermum mopane (Kirk ex. Benth) Kirk ex. J. Leonard were investigated on the high veld of Zimbabwe. Seed germination and seedling survival and growth were monitored under canopy and outside canopy microhabitats for a period... -
Population structure and growth of polydorid polychaetes that infest cultured abalone Haliotis midae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Simon AJ BoothPolydorid polychaetes can infest cultured abalone thereby reducing productivity. In order to effectively control these pests, their reproductive biology must be understood. The population dynamics and reproduction of polydorids infesting abalone Haliotis midae from two farms in South Africa is... -
Abundance, recruitment and residency of two sparids in an intermittently open estuary in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NC James PD Cowley AK WhitfieldThe recruitment of distinct year-class cohorts in two sparid species, Rhabdosargus holubi and Lithognathus lithognathus, were linked to records of daily mouth state in the intermittently open East Kleinemonde Estuary, South Africa, between 1995 and 2006. L. lithognathus only recruited... -
Further refutation of the primary-secondary settlement hypothesis for the brown mussel Perna perna
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KE Reaugh JM Harris GM BranchThe primary-secondary settlement hypothesis, that mussels first settle in algae and then move to mussel beds, was rejected as the only mode of recruitment for the brown mussel Perna perna in a previous study at one location over one year... -
Does vertical migratory behaviour retain fish larvae onshore in upwelling ecosystems? A modelling study of anchovy in the southern Benguela
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Parada C Mullon C Roy P Fréon L Hutchings CD van der LingenA spatially explicit individual-based model (IBM) forced by 3D temperature and current fields simulated by a hydrodynamic model of the southern Benguela upwelling region was used to test two hypotheses concerning the role of diel vertical migration (DVM) by Cape... -
Use of environmental parameters to explain the variability in spawnerrecruitment relationships of Namibian sardine Sardinops sagax
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CH Kirchner --- National Marine Information and Research Centre, Namibia CH Bartholomae --- National Marine Information and Research Centre, Namibia A Kreiner --- National Marine Information and Research Centre, NamibiaThis study attempts to explain the variability in recruitment of sardine in the northern Benguela and to develop potential models by including environmental information to predict recruitment. Two different recruitment and spawner number datasets were available: a VPA-developed dataset, for... -
Effects of long-term exclusion of the limpet Cymbula oculus (Born) on the distribution of intertidal organisms on a rocky shore
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GW Maneveldt --- Department of Biodiversity and Conservation Biology, South Africa RC Eager --- Department of Biodiversity and Conservation Biology, South Africa A Bassier --- Department of Biodiversity and Conservation Biology, South AfricaZonation patterns on rocky shores are typically as a result of both physical factors and biological interactions. Physical factors generally set the upper limits of species distributions whereas biological interactions generally set their lower limits. However, recent research has shown... -
The 2004 re-assessment of the South African sardine and anchovy populations to take account of revisions to earlier data and recent record abundances
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CL de Moor --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South Africa DS Butterworth --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South AfricaHydroacoustic surveys off the coast of South Africa over the early years of the 21st century indicated that both the sardine Sardinops sagax and anchovy Engraulis encrasicolus populations had simultaneously reached record abundances. The South African pelagic fishery is regulated... -
The retention of community service officers for an additional year at district hospitals in KwaZulu-Natal and the Eastern Cape and Limpopo provinces
Item type: Journal Article • Journal: South African Family Practice • Authors: A Ross --- Department of Family Medicine, S Reid --- Centre for Rural Health,Background: Community service (CS) is an effective recruitment strategy for underserved areas, using legislation as the driver; however, it is not a retention strategy. By the end of each year, most CS officers working in district hospitals (DHs) are skilled,... -
The nursery role of a sheltered surf-zone in warm-temperate southern Africa
Item type: Journal Article • Journal: African Zoology • Authors: Gavin M Rishworth --- Department of Zoology, Nelson Mandela Metropolitan University, South Africa Nadine A Strydom --- Department of Zoology, Nelson Mandela Metropolitan University, South Africa Warren M Potts --- Department of Ichthyology and Fisheries Science, Rhodes University, South AfricaMarine fish nurseries such as surf-zones have usually been classified as nurseries based solely on the density of pre-adult fish, yet the full suite of developmental stages are seldom assessed because of difficulties associated with sampling these habitats. The larval... -
Temporal changes in the macrobenthos of sandprawn (Callichirus kraussi) beds in Swartvlei Estuary, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Nicholas Hanekom --- South African National Parks, South Africa Ian A Russell --- South African National Parks, South AfricaWater quality was recorded quarterly along the length of the Swartvlei estuary (2002–2014), while seagrass biomass and macrobenthic abundance were measured annually in intertidal sandprawn beds (2009–2014). Despite relatively stable, marine-dominated conditions the abundance of the sandprawn Callichirus kraussi recorded... -
Species composition and recruitment of tidal pool fishes in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Lynnath E. Beckley --- Oceanographic Research Institute, South AfricaFishes occurring in a lower shore tidal pool near Durban, South Africa, were collected using rotenone at monthly intervals for a year. Eighteen teleost families and 50 lower taxa of fishes were recorded. Cryptic Tripterygiidae, Blenniidae and Gobiidae were particularly... -
Spatial and temporal population dynamics of rodents in three geographically different regions in Africa: Implication for ecologically-based rodent management
Item type: Journal Article • Journal: African Zoology • Authors: Apia W. Massawe --- Pest Management Centre, Sokoine University of Agriculture, Tanzania Loth S. Mulungu --- Pest Management Centre, Sokoine University of Agriculture, Tanzania Rhodes H. Makundi --- Pest Management Centre, Sokoine University of Agriculture, Tanzania Nomfundo Dlamini --- Department of Biological Sciences, Swaziland Seth J. Eiseb --- National Museum of Namibia, Namibia Frikkie Kirsten --- Agricultural Research Council-Plant Protection Research Institute, South Africa Themb’alilahlwa Mahlaba --- Department of Biological Sciences, Swaziland Phanuel Malebane --- Agricultural Research Council-Plant Protection Research Institute, South Africa Emil Von Maltitz --- Agricultural Research Council-Plant Protection Research Institute, South Africa Ara Monadjem --- Department of Biological Sciences, Swaziland Peter Taylor --- Durban Natural Science Museum, Heritage and Libraries Department, South Africa Vassana Tutjavi --- National Museum of Namibia, Namibia Steven R. Belmain --- Natural Resources Institute, University of Greenwich, U.K.As part of a three-year study to develop ecologically-based rodent management (EBRM) in southern Africa, a capture–mark–recapture study was carried out in Tanzania, Namibia and Swaziland to establish the demographic patterns and population dynamics of rodents. Two study grids were... -
Dynamics of recruitment of larval and juvenile Cape stumpnose Rhabdosargus holubi (Teleostei: Sparidae) into the Swartkops and Sundays estuaries, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Y Kisten --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa P Pattrick --- Department of Zoology, South Africa NA Strydom --- Department of Zoology, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaRecruitment of early life stages into estuaries is an integral part of the life cycle of many marine fish species. Although estuaries are naturally environmentally dynamic, they also are subject to anthropogenic disturbances, including land use and climate change, which... -
How do African Black Oystercatchers Haematopus moquini recruit into high-density populations?
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Douglas Loewenthal --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Dane M Paijmans --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Philip AR Hockey --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South AfricaTheoretical and empirical studies of oystercatchers both suggest that levels of adult site fidelity, natal philopatry and age-at-first-breeding are interrelated consequences of life-history decisions made by potential breeders. All are fundamental to explaining population dynamics and have important conservation implications... -
Understanding the association between the non-geniculate coralline red alga Spongites discoidea and the mollusc Oxystele sinensis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Eager --- Department of Biodiversity and Conservation Biology, South Africa C Puckree-Padua --- Department of Biodiversity and Conservation Biology, South Africa GW Maneveldt --- Department of Biodiversity and Conservation Biology, South AfricaNearly all adult winkles Oxystele sinensis encountered in the Kalk Bay (Western Cape province, South Africa) shallow subtidal zone were observed to bear a thick, convoluted form of the non-geniculate coralline red alga Spongites discoidea. To understand this association, various... -
Perceptions of the utility of personality assessment for personnel selection in the South African context: An exploratory study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Sapna Fakir --- Department of Psychology, South Africa Sumaya Laher --- Department of Psychology, South AfricaThis study explored South African industrial psychologists’ perceptions of the utility of personality assessment for personnel selection. Eleven industrial psychologists (2 male, 9 female) from the Johannesburg area, South Africa were the participants. They participated in semi-structured interviews exploring their... -
Spatial and temporal variability in the larval fish assemblage of a warm temperate South African estuary, with notes on the effects of artificial channelling
Item type: Journal Article • Journal: African Zoology • Authors: M. Kruger --- Department of Ichthyology and Fisheries Science, South Africa N.A. Strydom --- South African Institute for Aquatic Biodiversity, South AfricaThe composition, abundance, distribution and seasonality of larval fishes was investigated in the permanently open Kowie Estuary on the temperate southeast coast of South Africa. Larval fishes were sampled within the estuary and marina for a period of two years... -
Spatio-temporal patterns of coral recruitment at Vamizi Island, Quirimbas Archipelago, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Sola --- School of Life Sciences, South Africa I Marques da Silva --- Faculdade de Ciências Naturais, Moçambique D Glassom --- School of Life Sciences, South AfricaSpatial and temporal patterns of recruitment of reef corals were assessed for the first time in Mozambique by deploying settlement plates at various spatio-temporal scales between October 2012 and October 2013. The abundance of juvenile corals (5−50 mm in diameter) was... -
Penaeid and carid community changes in the St Lucia estuarine lake system, South Africa, under low water level, extended closed periods and marine reconnection conditions
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GP Tweddle --- Coastal Research Unit of Zululand, Department of Zoology, South Africa DP Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa L Vivier --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaPenaeid and carid communities were assessed in St Lucia over a wide range of saline conditions, water level conditions and mouth states, including a six-month marine connection and various connections to the Mfolozi Estuary. Samples were collected biannually in spring... -
Sublittoral seaweed communities on natural and artificial substrata in a high-latitude coral community in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Gersun --- Department of Biological Sciences and Marine Research Institute, South Africa RJ Anderson --- Department of Biological Sciences and Marine Research Institute, South Africa JR Hart --- Oceanographic Research Institute, South Africa GW Maneveldt --- Department of Biodiversity and Conservation Biology, South Africa JJ Bolton --- Department of Biological Sciences and Marine Research Institute, South AfricaCoral mortality may result in macroalgal proliferation or a phase shift into an alga-dominated state. Subtidal, high-latitude western Indian Ocean coral communities at Sodwana Bay on the KwaZulu-Natal coast, South Africa, have experienced some mortality because of warm-water anomalies, storms... -
Soil seed bank depletion as a mechanism of Lantana camara L. invasion
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sheunesu Ruwanza --- Department of Environmental Science, South AfricaLantana camara is an invasive plant in South Africa with a wide range of impacts. This study assessed the impact of L. camara invasion on the soil seed bank. The study asked the question, does species density and diversity of... -
Decision-support tool for management of miombo woodlands: a matrix model approach
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Wilson A Mugasha --- Department of Ecology and Natural Resource Management, Norway Ole M Bollandsås --- Department of Ecology and Natural Resource Management, Norway Terje Gobakken --- Department of Ecology and Natural Resource Management, Norway Eliakimu Zahabu --- Department of Forest Mensuration and Management, Tanzania Josiah Z Katani --- Department of Forest Mensuration and Management, Tanzania Tron Eid --- Department of Ecology and Natural Resource Management, NorwayRational forest management planning requires information on the present forest state and on future development. However, forest management planning in Tanzania has often been done without any information on forest development because appropriate tools are lacking. This study presents a... -
When plenty is not enough: an assessment of the white stumpnose (Rhabdosargus globiceps) fishery of Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Fisheries Management Branch, Department of Agriculture, South Africa SE Kerwath --- Fisheries Management Branch, Department of Agriculture, South Africa TF Næsje --- Norwegian Institute for Nature Research (NINA), Norway CJ Arendse --- South African National Parks, Rondevlei Scientific Services (Garden Route National Park), South Africa FJ Keulder-Stenevik --- Sars Centre for Marine Molecular Biology, Norway K Hutchings --- Anchor Environmental Consultants, South Africa BM Clark --- Anchor Environmental Consultants, South Africa H Winker --- Fisheries Management Branch, Department of Agriculture, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa CG Attwood --- Department of Biological Sciences, South AfricaWhite stumpnose Rhabdosargus globiceps is the main target of the linefishery in Saldanha Bay. Increased fishing pressure over the last three decades, particularly by the recreational sector, has led to concerns regarding sustainability of the local white stumpnose stock. The... -
Two cases of probable hybridisation between the pufferfishes Arothron meleagris (Anonymous 1798) and A. nigropunctatus (Bloch and Schneider 1801) on a fringing reef at Réunion Island
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Bourjon --- Les Sentinelles du Récif, réseau d’observateurs volontaires de la Réserve Naturelle Marine de La Réunion [‘Sentinels of the Reef’, Volunteer Observers Network of the Réunion Marine Park] (GIP–RNMR), Réunion Island B Chanet --- Institut de Systématique, FranceTwo individuals displaying mixed features of the colour patterns distinctive of Arothron meleagris and A. nigropunctatus were observed on the fringing reef at Réunion Island, between September 2012 and August 2013. Because many hybrid fish have been first identified through... -
The population dynamics of a recently introduced crayfish, Cherax quadricarinatus (von Martens, 1868), in the Sanyati Basin of Lake Kariba, Zimbabwe
Item type: Journal Article • Journal: African Zoology • Authors: Lightone Marufu --- Department of Biological Sciences, Zimbabwe Maxwel Barson --- Department of Biological Sciences, Zimbabwe Portia Chifamba --- Department of Biological Sciences, Zimbabwe Michael Tiki --- Zimbabwe National Parks and Wildlife Authority, Zimbabwe Tamuka Nhiwatiwa --- Department of Biological Sciences, ZimbabweThe redclaw crayfish Cherax quadricarinatus is a recent introduction into Lake Kariba, Zimbabwe where it is rapidly spreading. There are, however, no studies that have investigated the population dynamics and possible ecological impacts of the crayfish in the lake. This... -
Growth and mortality parameters of the black-chinned tilapia Sarotherodon melanotheron melanotheron (Pisces: Cichlidae) in a small lagoon in the Central Region of Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GA Tibu --- Department of Fisheries and Aquatic Sciences, Ghana DW Aheto --- Department of Fisheries and Aquatic Sciences, Ghana J Blay --- Department of Fisheries and Aquatic Sciences, GhanaThis study quantified growth, mortality, and exploitation rate of the black-chinned tilapia (Sarotherodon melanotheron melanotheron) population in Etsir Lagoon, a small brackish waterbody at Abandze (5°11′ N, 1°5′ W) in the Central Region of Ghana for management of the stock... -
The influence of prolonged drought and anthropogenic impact reversal on fish community structure and ecosystem state cycling of Lake St Lucia, Africa’s largest estuarine lake
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Cyrus --- Coastal Research Unit of Zululand, South Africa Q Schutte --- Coastal Research Unit of Zululand, South Africa L Vivier --- Coastal Research Unit of Zululand, South AfricaHistorically, the St Lucia Estuarine Lake System and uMfolozi River joined via an estuarine bay before exiting to the sea. In 1952, separate mouths were created, because of sediment problems originating from the uMfolozi River. During the 2004 drought, the... -
Stand structure, regeneration and seed dispersal patterns of Nothofagus glauca (Hualo) in central Chile
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rafael Navarro-Cerrillo --- , España Antonio Cabrera-Ariza --- , Chile Antonio Avaria --- , Chile Guillermo Palacios-Rodríguez --- , España Rómulo Santelices-Moya --- , ChileGrowing interest in functional silviculture is promoting new approaches to the study of seed dispersal and regeneration, two of the key processes that determine the structure and dynamics of plant populations. Nothofagus glauca is an obligate-seeding tree species typical of... -
Age estimates of chokka squid Loligo reynaudii off South Africa and their use to test the effectiveness of a closed season for conserving this resource
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MR Lipiński --- , South Africa CH Mwanangombe --- , South Africa D Durholtz --- , South Africa D Yemane --- , South Africa J Githaiga-Mwicigi --- , South Africa WHH Sauer --- , South AfricaThis study presents age distributions in an exploited population of spawning chokka squid Loligo reynaudii together with their back-calculated spawning times, and considers the results in relation to the exploitation of this species. Samples were collected during two closed fishing... -
Diel and tidal periodicity in the responses of early life stages of marine fishes to an estuary opening event in temperate South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Y Kisten --- , South Africa NA Strydom --- , South AfricaEarly life stages of fish were monitored in a breach channel during an opening event of the temporarily open/closed East Kleinemonde Estuary. For comparison, early life stages were also collected in the surf zone and estuary mouth region before, during... -
Beach profiling and ghost crab densities on a hawksbill turtle nesting beach in the Seychelles
Item type: Journal Article • Journal: African Zoology • Authors: Julie A Gane --- , South Africa Colleen T Downs --- , South Africa Benjamin Harris --- , South Africa Mark Brown --- , South AfricaIncreasing beach sediment loss from erosion and high levels of crab Ocypode spp. predation are threatening turtle nests and nesting habitat. The 900 m long beach on Cousine Island, Seychelles, supports a nesting population of approximately 70–130 hawksbill turtle Eretmochelys... -
Determining the post-herbivore-exclusion effect on an intertidal community by the recovery response of a known dominant herbivore
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DC van den Berg --- , South Africa K Sethebe --- , South Africa GW Maneveldt --- , South AfricaFollowing a long-term herbivore-exclusion study (2003-2008) in the mid-eulittoral zone at Kalk Bay, Cape Town, South Africa, the post-herbivore-exclusion effect (12 years later) of the limpet Cymbula oculus, the dominant herbivore in the community, was examined after it had recolonised... -
Disturbance impacts on the persistence niche of key species in the Baikiaea–Guibourtia–Pterocarpus woodlands of north-western Zimbabwe
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: A Chichinye --- , Zimbabwe CJ Geldenhuys --- , South Africa PW Chirwa --- , South AfricaThe persistence niche (studied through different modes regeneration) of three key species (Baikiaea plurijuga (Harms), Guibourtia coleosperma (Benth.) J. Leonard and Pterocarpus angolensis) (DC) under five different disturbance regimes (eight years after cessation of disturbance) was studied in the Baikiaea–Guibourtia–Pterocarpus... -
Recruitment managers’ emotional intelligence and employment discrimination against people living with HIV/AIDS: The mediating role of stigma
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Michael A. Ofili --- , South Africa Erhabor S. Idemudia --- , South Africa Babatola D. Olawa --- , South AfricaThis study examined the mediating role of stigma on relationship between emotional intelligence (EI) and employment discrimination against people living with HIV/AIDS (PLWHA). Participants included 1 112 recruitment managers (female = 49%, senior managers = 68%) drawn from both private... -
Post-fire tree regeneration from seed of the endangered Nothofagus alessandrii Espinosa in the Maule region of central Chile
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Persy Gómez --- , Chile Sergio Espinoza --- , Chile Pedro Garrido --- , Chile José San Martín --- , Chile Yony Ormazábal --- , ChileThe endemic ruil (Nothofagus alessandrii Espinosa) forest is one of the most endangered forest ecosystems in central Chile, where its regeneration is challenged by factors such as low seedling germination capacity and recently by fire. In this study, we sampled... -
Herbicide trials on Campuloclinium macrocephalum (Asteraceae) during adverse conditions reveal incompatibility with biocontrol and a narrow window of opportunity for chemical control
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JM Goodall --- University of the Witwatersrand, South Africa ETF Witkowski --- University of the Witwatersrand, South AfricaHerbicide trials on pompom weed Campuloclinium macrocephalum (Less.) DC. (Asteraceae) were carried out in grasslands with xeric and hydric soils, at sites in Gauteng, South Africa, from 2005 to 2008. The rust fungus Puccinia eupatorii Dietel, an established self-perpetuating biocontrol... -
Identifying HIV-exposed uninfected children and adolescents in resource-limited settings: the HOPE study experience
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Hellen Moraa --- , Kenya Maureen Kinge --- University of Nairobi, Kenya Alvin Onyango --- , Kenya Daniel Matemo --- , Kenya Grace John-Stewart --- University of Washington, USA Dalton Wamalwa --- University of Nairobi, Kenya Irene Njuguna --- , KenyaHIV-exposed uninfected (HEU) children and adolescents are at higher risk of poor outcomes compared to HIV-unexposed children (HUU). In program settings, it is critical to understand how to identify HEU for screening services. We describe our experience identifying HEU for... -
Beyond gender bias: Factors affecting female employee retention and advancement in the Dutch hotel sector
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Marrit Lijster --- NHL Stenden University of Applied Sciences, The Netherlands Georges El Hajal --- NHL Stenden University of Applied Sciences, The NetherlandsIn The Netherlands, gender roles have evolved remarkably, marked by feminist activism and legislative strides. Nevertheless, persistent gender biases and disparities continue to impact many industries, including the Dutch hotel sector. This quantitative research explores the factors affecting female employee... -
Distribution and movement patterns of white musselcracker Sparodon durbanensis, a South African endemic seabream
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- Oceanographic Research Institute (ORI), South Africa GL Jordaan --- Oceanographic Research Institute (ORI), South Africa R Daly --- Oceanographic Research Institute (ORI), South Africa WN Dalton --- Oceanographic Research Institute (ORI), South Africa PA Watt-Pringle --- Oceanographic Research Institute (ORI), South Africa K Hewett --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaThe white musselcracker Sparodon durbanensis (family Sparidae) is a highly prized shore angling and spearfishing species. This study investigated its movement behaviour along the southeastern seaboard of South Africa, using tag-recapture data. A total of 3 378 S. durbanensis were... -
Individual variability in the thermal limits of juvenile dusky kob Argyrosomus japonicus from a permanently open estuary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Frachet --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa A-R Childs --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa AC Winkler --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa MW Farthing --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa CD Hempel --- Rhodes University Department of Ichthyology and Fisheries Sciences, South Africa WM Potts --- Rhodes University Department of Ichthyology and Fisheries Sciences, South AfricaGlobally, fish are facing the pressure of increasing thermal variability, which challenges the physiological capacity and resilience of species at the level of the individual, population and community. As transition zones, estuarine ecosystems are becoming increasingly thermally dynamic, which affects...