A5023994629- Heavy metals in environment
- Aquatic Ecosystems and Biodiversity
- Water Quality and Pollution Assessment
- Marine and fisheries research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Coastal wetland ecosystem dynamics
- International Maritime Law Issues
- Mercury impact and mitigation studies
- Coral and Marine Ecosystems Studies
- Isotope Analysis in Ecology
- Geochemistry and Geologic Mapping
- Microplastics and Plastic Pollution
- Environmental Toxicology and Ecotoxicology
- Fish Ecology and Management Studies
- Fish Biology and Ecology Studies
- Marine Biology and Ecology Research
- Heavy Metal Exposure and Toxicity
- Mine drainage and remediation techniques
- Marine and coastal plant biology
- Nanoparticles: synthesis and applications
- Marine and Offshore Engineering Studies
- Plant Ecology and Soil Science
- Environmental Chemistry and Analysis
- Mining and Resource Management
- Environmental and Analytical Chemistry Studies
University of Dar es Salaam
2013-2022
The histopathological effects of microplastics (MPs) in the gastrointestinal tracts fish following long-term exposure and depuration are relatively understudied. This study investigated histomorphological damage small intestine Oreochromis urolepis larvae 65 d to 38–45 μm polyethylene microspheres (PE MPs) after a recovery period 60 d. Larval were assigned each treatment group (control, 1, 10 100 PE MPs), where ingestion degenerative changes examined using routine hematoxylin eosin staining...
Microplastics-induced histopathological changes in gastrointestinal tracts of fish have been widely reported. However, the translation adverse effects gut to impacts on growth are understudied. This study investigated effect MP-induced small intestinal histomorphological performance Oreochromis urolepis juveniles. Sixty larvae were exposed control (0), 1, 10, and 100 polyethylene microplastic particles (PE MPs)/mL treatment groups. On day 65, juveniles euthanized, dissected, biometric data...
Abstract The current study was carried out to examine the spatial and temporal variations of physicochemical water quality parameters Lake Bunyonyi. observations were made on surface Bunyonyi for 1 year determine quality. basic 12 variables used measured monthly at nine stations. Water temperature, dissolved oxygen (DO), turbidity, electric conductivity (EC), pH Secchi depth (SD) in field, while like total nitrogen (TN), phosphorus (TP), nitrite-nitrogen (NO 2 -N), nitrate-nitrogen 3 soluble...
Metal pollution in the Mzinga creek mangrove stand was assessed and compared with arelatively pristine forest at Ras Dege Dar es Salaam. The concentrations of cadmium,chromium, copper, lead zinc sediment polychaete worms (Capitella sp.) were analyzedby ICP-AES mercury analyzed by a semi-automatic analyzer. Concentrations most ofthe metals higher samples from than Dege. Sedimentsamples enriched Cu (EF = 7.4), Hg 5.3) Cr (EF= 3.3) relative to Dege, which mostly natural backgroundlevels....
Spatial and temporal distribution of trace metals their cycling is a key issue for understanding the ongoing biogeochemical processes in coastal environments. Sediment cores were collected from six different sampling locations Rufiji delta mangrove forests southeastern Tanzania that are perceived to be impacted by urban development agricultural activities catchment, pollution upstream sections River. The chronology sediment accumulation rates at these sites derived based on 210Pbexcess...
To investigate the influence of human activities on limnological characteristics Lake Victoria, we analyzed inorganic nutrient concentrations, phytoplankton diversity and biomass at three locations with different land use patterns: Mwanza (urban/industrial), Magu (agricultural) Kayenze (sparsely populated). had significantly higher ammonia concentration compared to Magu. At shoreline stations, nitrate was observed Similarly, concentrations soluble reactive phosphorous in stations Kayenze,...
Results of the assessment enrichment, accumulation and ecological risk associated with three heavy metals (Cd, Cu Pb) one metalloid (As) in surface sediments Msimbazi estuary are presented. Surface sediment samples (0–5 cm) were collected from River September 2016 using handheld PVC short corers. Long-sediment cores site also pipes their vertical profiles concentrations assessed aim establishing site-specific baseline concentrations. The established values used for determination normalised...
Heavy metal (cadmium, chromium, copper, mercury, lead and zinc) concentrations in mangrove forests were investigated water, suspended particulate matter (SPM) oyster samples from the Mzinga Creek Ras Dege stands, Tanzania, using Inductively Coupled Plasma–Atomic Emission Spectroscopy. With exception of Zn, dissolved metals generally less than 1μg l–1 all samples. Higher recorded SPM forest, on ebb tides during rainy season. Concentrations Cd ranged 33.9–85.5μg g–1 dw and, for Cr,...
Estuaries are primary habitats that serve as feeding and nursery grounds for most juvenile marine fish. However, estuaries have been used fishing by the artisanal fishers in Tanzania. The slow-growing predatory fish at sub-adult stages among frequently caught species functionally enhance multiple linkages of energy pathways within food web. Stomach contents stable isotopes (δ13C δ15N) were to describe nutritional sources trophic niches between co-existing benthic, species, Carangoides...
A study was conducted to assess the levels of pollutant metals in suspended particulate matter and Nile perch from Lake Victoria. The were determined ascertain their concentrations at base food chain. samples collected September 2003 five major fish processing factories shores Victoria Mwanza Musoma. total Hg, Pb, Cd, Cu generally low most locations close or below limits detection. Zn high matter, highest being 219.4 ± 153.0 μ g L− 1 found Nungwe Bay southern part contained heavy metals;...
Urbanization and the concentration of industrial sites in coastal regions have led to a strong risk heavy metals contamination neighbouring marine environment. Analysis dated sediment cores from these environments may allow historical trends metal input be reconstructed, recent inputs contaminants compared. In this work we assessed depth profile lead concentrations; converted time-based profiles using 210Pb dating method; established site-specific baseline value for estimated enrichment...