A5083715339- Diatoms and Algae Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Invertebrate Ecology and Behavior
- Fish biology, ecology, and behavior
- Water Quality Monitoring and Analysis
- Water Quality and Pollution Assessment
- Fish Ecology and Management Studies
- Environmental Toxicology and Ecotoxicology
- Marine and coastal ecosystems
- Aquatic Ecosystems and Biodiversity
- Lichen and fungal ecology
- Algal biology and biofuel production
- Fern and Epiphyte Biology
- Analytical chemistry methods development
- Paleontology and Stratigraphy of Fossils
- Coastal wetland ecosystem dynamics
- Musculoskeletal pain and rehabilitation
- Species Distribution and Climate Change
- Turtle Biology and Conservation
- Microbial Community Ecology and Physiology
- Amphibian and Reptile Biology
- Library Science and Information Systems
- Traumatic Brain Injury and Neurovascular Disturbances
- Venomous Animal Envenomation and Studies
South African Institute for Aquatic Biodiversity
2015-2025
North-West University
2016-2025
Office of the National Coordinator for Health Information Technology
2017
Meise Botanic Garden
2013-2016
Rhodes University
2015
Womack Army Medical Center
2010-2014
Everglades University
2014
Urology Associates
2012
Environmental Earth Sciences
2003
Florida International University
2003
Summary 1. Our goal was to quantify short‐term phosphorus (P) partitioning and identify the ecosystem components important P cycling in wetland ecosystems. To do this, we added radiotracer oligotrophic, P‐limited Everglades marshes. 32 PO 4 water column six 1‐m 2 enclosed mesocosms located long‐hydroperiod marshes of Shark River Slough, National Park. Ecosystem were then repeatedly sampled over 18 days. 2. Water particulates (>0.45 μ m) incorporated within first minute after dosing stored...
The applicability of a European numerical diatom index, the Specific Pollution sensitivity Index (SPI), was tested in river system where SPI scores were compared both to chemical water quality and yielded using macro-invertebrate index riverine health namely South African Scoring System (SASS 5). This investigation showed that reflects certain elements with high degree accuracy. Due broad species base SPI, few problems encountered when this Southern Hemisphere. conclusion is or similar will...
Chemical monitoring of water resources is time-consuming and comparatively expensive may not always provide a composite reflection actual quality. Biotic indices using faunal elements, such as macroinvertebrates fish, are already in place South Africa part the National Biomonitoring Programme for Aquatic Ecosystems (NBPAE). As yet periphyton communities included this programme due to perceived difficulties application these methods. Diatom samples were collected from 10 sites Vaal Wilge...
Abstract Diatoms have become important organisms for monitoring freshwaters and their value has been recognised cross-border water quality in the European Union. If South Africa is to include diatoms current suite of bioindicators, then thorough testing diatom-based techniques required. This paper provides guidance on methods through all stages diatom collection, preparation examination purposes assessment. Keywords: ARCHIVINGBIOMONITORINGDIATOM-BASED...
Water quality assessment protocols based on the use of diatoms are now well developed and their value substantiated at an international level. The is not designed or intended to be a "rapid" technology. detailed level information generated from procedure outweighs perceived disadvantages additional time required for sample preparation analysis species method applicable across wide range aquatic ecosystem types, namely freshwater, brackish, estuarine, inclusive both lentic lotic environments,...
Two new diatom taxa belonging to the genus Surirella, S. ebalensis and congolensis, are described from material of Congo Basin, downstream Kisangani, DR Congo. The first taxon is a small, rather common species in studied material; second somewhat larger that was only sporadically observed. morphology both examined with light scanning electron microscopy. differences between other closely related such as agonaensis bonsaensis, takoradiensis, tenuissima pseudotenuissima, respectively, discussed.
Freshwater macroinvertebrates, often used as indicators of environmental quality for freshwater ecosystems, may be compromised by microplastics (MPs). We investigated MPs occurring in benthic filter feeder, predator, and grazer macroinvertebrates collected from the catchment-independent but adjacent Olifants Sabie rivers Kruger National Park duplicates. counted 369 376 organisms (1.0 n/organism) with a mean 8.8 n/organism, 8.5 0.16 n/organism feeders, predators, grazers, respectively. Based...
During a survey of the freshwater diatom flora Senegal River, an unknown Placoneis species was observed that initially identified as gastrum. Detailed morphological analysis using both light and scanning electron microscopy observations revealed sufficient differences to separate this cocquytiae sp. nov. The new is characterized by rather broadly lanceolate elliptic-lanceolate valve outline with rostrate, protracted, rounded apices. central area has irregular shape due shortening several...
Special Operations Forces (SOF) Soldiers deploy frequently and require high levels of physical cognitive performance. Nutritional status is linked to Studies evaluating dietary intake nutritional in deployed environments are lacking. Therefore, this study assessed the effects combat deployment on diet quality serum concentrations markers, including iron, vitamin D, parathyroid hormone (PTH), glucose, lipids, among elite United States (U.S.) Army SOF Soldiers.Changes from baseline...
AbstractThis study focused on the spring-fed upper reaches of economically important Great Fish River with aim determining if diatoms could be used for biomonitoring in semi-arid conditions southern Africa. Five sites were monitored monthly from 2010 to 2012. Of 269 diatom taxa belonging 51 genera identified, dominant mostly those considered pollution-tolerant: Amphora pediculus, Craticula buderi, Fragilaria biceps, Nitzschia frustulum, paleacea, Planothidium lanceolatum and Rhopalodia...
Background: Species checklists are a way in which local biodiversity can be monitored. There is no readily accessible database or checklist of diatom flora South Africa. This publication gives an account the taxa encountered during two survey projects (2010–2012 and 2015–2017) within Eastern Karoo. Objectives: list has been compiled to allow for: (1) comparisons with future research geographical area; (2) comparison ecological data from other countries; (3) monitoring occurrence new species;...
Species in the genus Eunotia commonly occur waters with acidic to circumneutral pH, low nutrient content, and dissolved salt concentrations. The is also encountered worldwide dystrophic habitats high humic acid content. Taxa from this are considered be sensitive pollution indicators of good water quality. Democratic Republic Congo, its remaining tropical forest, has many such waterbodies. Small forest streams support a great diversity diatoms particular. These bodies often at risk multiple...
South Africa has a long legacy of diatom research. The eminent diatomist Dr BJ Cholnoky spent much his working life examining and enumerating communities found in Southern Africa. Most if not all Cholnoky's collected material the form mounted on glass slides accompanied by analysis sheets is stored African Diatom Collection currently housed at CSIR Durban. As only employed enumeration methods yielding margin error 2% or less, results should provide an accurate reflection structure that he...
This paper provides a description of the zooplankton and epiphytic diatom communities permanent temporary freshwater pans in Mpumalanga Highveld region South Africa. Few studies have investigated biota this area, which is seriously threatened by mining agricultural development. Nineteen pan sites within 20 kmradius covering wide range water chemistries were sampled once for zooplankton, diatoms physico-chemical data 2009. Collected samples identified to species or genus level. Many taxa...
A study was made of the type material Achnanthidium exiguum (Grunow) CzarneCKi.This often encountered and apparently ubiquitous species originally described as Stauroneis exilis by KüTzinG from island Trinidad later re-named Achnanthes exigua Grunow.The for this taxon (KüTzinG sample 397), housed in Van heurCK collection at National Botanic Garden Belgium, Meise investigated ultrastructure documented using both LM SEM observations.A new Antarctic taxon, formerly identified A. exigua, a...
U.S. Army Special Operations Forces (SOF) soldiers deploy frequently and conduct military operations through special warfare surgical strike capabilities. Tasks required to execute these capabilities may induce physical mental stress have the potential degrade soldier physiological status. No investigations longitudinally characterized whether combat deployment alters anthropometrics or biochemical markers of status in a SOF population frequent deployers.Effects modern on longitudinal...