A5088954896- Marine and fisheries research
- Fish Ecology and Management Studies
- Fish Biology and Ecology Studies
- Coral and Marine Ecosystems Studies
- Marine Bivalve and Aquaculture Studies
- Marine Biology and Ecology Research
- Marine and coastal ecosystems
- Aquatic Ecosystems and Biodiversity
- Coastal and Marine Management
- Isotope Analysis in Ecology
- Fish biology, ecology, and behavior
- Ichthyology and Marine Biology
- Marine and coastal plant biology
- Aquaculture Nutrition and Growth
- Aquatic Ecosystems and Phytoplankton Dynamics
- Geology and Paleoclimatology Research
- Microplastics and Plastic Pollution
- Aquatic Invertebrate Ecology and Behavior
- Mercury impact and mitigation studies
- Heavy metals in environment
- Environmental Toxicology and Ecotoxicology
- Animal Disease Management and Epidemiology
- Water Quality and Pollution Assessment
- Veterinary Practice and Education Studies
- Identification and Quantification in Food
Nelson Mandela University
2015-2024
South African Institute for Aquatic Biodiversity
2003-2018
Universidad Metropolitana
2010
Rhodes University
2003
In 2005/2006 a multidisciplinary research programme that included studies on the hydrodynamics, sediment dynamics, macronutrients, microalgae, macrophytes, zoobenthos, hyperbenthos, zooplankton, ichthyoplankton, fish and birds of temporarily open/closed East Kleinemonde Estuary was conducted. Particular attention given to responses different ecosystem components opening closing estuary mouth how this is driven by both riverine marine events. Using complementary dataset daily conditions...
Assemblages of early stage fishes (larval and juvenile stages) were investigated compared in seven permanently open five intermittently estuarine systems on the warm temperate Eastern Cape coast South Africa. Estuarine type, by virtue mouth state prevailing physico chemical conditions, played a defining role structure these fish assemblages. Clupeidae Gobiidae dominant families both types. Permanently estuaries characterized predominance larvae juveniles estuary dependent marine species...
Abstract Parasites have deleterious effects on their hosts, often resulting in altered host behavior or increased energy expenditure. When organisms are exposed to suboptimal environments, parasite loading may increase. Microbialite pools along the warm temperate South African coastline been hypothesized as refugia for Epaulette gobies ( Coryogalops sordidus , Gobiidae) when they outside of previously known subtropical distribution. The aim this study was determine if C. individuals infected...
Past investigations into South African estuaries that are subject to altered freshwater flow regimes have concentrated on the effects of reduced river recruiting estuary-dependent marine fish species. This study compares larval and juvenile abundance an estuary resident, Gilchristella aestuaria, in upper reaches ‘freshwater-deprived’ Kariega Estuary ‘freshwater-rich’ Great Fish Estuary. Catches were significantly greater than those Larval densities correlated regressed with salinity,...
Following the first description of living marine stromatolites along South African east coast, new investigations south coast have revealed occurrence extensive fields actively calcifying stromatolites. These been recorded at regular distances a 200-km stretch coastline, from Cape Recife in to Storms River mouth west, with highest density found between Schoenmakerskop and Maitland mouth. All active are associated freshwater seepage streams flowing dune cordon, which form rimstone dams other...
Abstract Grazing and burrowing organisms usually homogenise microalgal mats that form on benthic sediments of many aquatic ecosystems. In the absence this disruption, can accrete laminated deposits (stromatolites). Stromatolites are rare in modern coastal ecosystems, but persist at locations where metazoans largely excluded. This study aimed to assess trophic structure stromatolite co-occur, determine grazing influence exerted by stromatolite-forming microalgae (cyanobacteria diatoms)....
Dispersion processes in the ocean typically involve wind, currents and waves. All these factors were included an analysis to model nurdle dispersion from accidental spill Durban Harbour, South Africa, October 2017. Nurdle sightings on beaches by members of public are used as indicators which extended over 2000 km African coastline a period 8 weeks. Using known oceanographic current structures, satellite imagery, wave data surface wind drift values between 5% 8% speed, good agreement was...
The influence of wind and wave exposure on larval fish assemblages within a large bay system was investigated. Larval fishes were sampled from two areas with vastly different to waves wind, namely the windward leeward sectors Algoa Bay. In total, 5702 collected using modified seine. Of these, 4391 in 1311 sector bay, representing total 23 families 57 species. Dominant included Clinidae, Engraulidae, Kyphosidae, Mugilidae, Soleidae Sparidae, similar situation elsewhere, highlighting...
The permanently eutrophic Sundays Estuary experiences recurrent harmful algal blooms (HABs) of Heterosigma akashiwo (Raphidophyceae). This study aimed to identify the environmental variables shaping phytoplankton community composition and succession patterns during a typical spring/summer bloom (HAB) period. Monitoring abiotic was undertaken over period month in 2016. Surface water salinity corresponding mesohaline conditions (9 12) prerequisite for site selection. During study, two HABs...
Multiple habitats were investigated in a known fish nursery area to further understand habitat partitioning among juveniles the lower reaches of warm temperate, permanently open Swartkops Estuary, South Africa. Fishes collected using 30-m seine net with mesh size 10 mm sand, mud, creek and vegetated types. Each type was sampled two locations twice per season from February 2013 January 2014. Shallow-water creeks coverage Zostera capensis Spartina maritima found be important use areas for...