Environmental & Physical Sciences

Research Papers/Topics in Environmental & Physical Sciences

Studies On The Biology And Chemical Control Of Amblyohha Variegatum' (Fabricius, 1794) Ticks On The Accra Plains Of Ghana

ABSTRACT In a study of the life cycle of Amblyomma variegatum under laboratory conditions of 72%±2 RH and temperature of 28°C±2, the feeding periods of larvae and nymphs on rabbits were 6-9 days and 6-13 days respectively, while that of adults on sheep was 17-19 days. The mean unfed weights of larva, nymph and adult were 0.149 x 10-3g, 0.906 X 10-3g and 28.5 x 10-3g respectively, while their mean fed weights were 2.14 x 10-3g, 48.6 x 10-3g and 2874 x 10-3g respectively. The moult...

Assessment Of Selected Borehole Water Quality And Efficiency Of Homemade Water Filter Purification Devices In Mariental Rural, Hardap Region.

ABSTRACTApproximately 6.6% of Hardap Region has unsafe drinking water according to WHO (2018) guidelines. Consuming this water can cause serious illness. Three filters, namely the bucket filter, sand filter, and charcoal filters were constructed and tested for physico-chemical and bacteriological removal efficiencies. More than 500 000 people in developing countries use filters to treat drinking water. Regardless of this positive implementation, there is limited knowledge to improve its desig...

Abundance, Structure And Uses Of Baobab (Adansonia Digitata L.) Populations In Omusati Region, Namibia

ABSTRACTThis study sought to determine the biology and the uses of baobab (Adansonia digitata L.) populations in Outapi and Onesi constituencies in Omusati Region, Namibia. As one of the important Non-Timber Forest Products (NTFPs)-providing species of ecological and socio-economic significance, there is need to have a better understanding of the biology and local uses of the species before its full potential and sustainable harvesting is realized. A comparison of densities, distribution patt...

The Influence Of Land Use On Plant Species Diversity In The Biosphere Area “Schwäbische Alb”, Southwest Germany

AbstractThe aim of this study was to determine the relations between the intensity of landuse and the characteristics of different habitat types within the grasslandecosystem in the Biosphere Area “Schwäbische Alb” in Germany. Data has beencollected based on 50 examination plots (4×4 m) of the BiodiversityExploratories project. These plots represented different land use types and levelsof intensity which are 1) grazed, ungrazed 2) once, twice, three times mowed, 3)fertilised, unfertilis...

Age Determination And Growth Rate Of The Northern Benguela Sardine (Sardinops Sagax)

AbstractThe main objective of this study was to determine sardine age by counting rings on otoliths and to analyse the length, age and growth through regression and Von Bertalanffy Growth models. Otoliths amounting to 826 pairs were collected from the annual sardine research survey of the Ministry of Fisheries and Marine Resources in October 2013. A total of 713 sardine otoliths were mounted on black Perspex plates and aged by means of counting rings using a Zeiss microscope at a magnificatio...

Assessing Grevy's Zebra (Equus Grevyi) And Livestock Interactions Through Satellite Tracking And Community Involvement In Samburu County (Kenya).

AbstractThe study's purpose was to delineate seasonal space use variations of theendangered Grevy's zebra (Equus grevyi), and to determine the extent ofoverlap of these areas with livestock grazing zones in order to identify coreareas suitable for conservation efforts. E. grevyi requires protection as theirpopulation size severely decreased in the last century and they continue tosuffer from habitat loss. Additional importance lies in reconciling interests ofwildlife protection and livestock ...

The Potential Of Acacia Karroo Leaf Meal As A Protein Supplement For Fattening Goats

AbstractAcacia karroo is one of the most widespread and abundant indigenous tree legume species in Southern Africa. The tree possesses positive attributes such as high growth rates, drought tolerance, adaptation to acidic infertile soils and resistance to large temperature variations. In the recent past, A. karroo was deemed to be a severe encroacher, which adversely affected land utilisation and rangeland productivity. Research attention has been diverted from its riddance as a weed to its u...

Assessment Of Natural Radioactivity In The Soils Of The Ohorongo Cement Plant And The Town Of Otavi, Namibia

ABSTRACTThe activity concentrations of the naturally occurring radionuclides 238U, 232Th, and40K in soil samples collected from the Ohorongo Cement plant and the town of Otavi,Namibia have been determined using a High-Purity Germanium (HPGe) detector. Inaddition, an assessment of the radiological hazards due to these natural radionuclidesin the soils of the plant and town was carried out. The plant was divided into threegeographical areas, and fifty soil samples were collected across the area...

Assessment Of Species Boundaries Of The Moringa Ovalifolia (Dinter & A. Berger) In Namibia Using Nuclear Its Dna Sequence Data

ABSTRACTThe genus Moringa comprises of thirteen (13) species of trees and shrubs, widely distributed in the tropical and subtropical regions. For its size, this genus is one of the phenotypically varied group of angiosperms whose members are mostly sought after for nutritional, nutraceutical and industrial uses. The aim of this study was to assess the species boundaries of Moringa ovalifolia in Namibia by using the nuclear Internal Transcribed Spacer (ITS) sequenced data analysis. A total of ...

The Effect Of Bush Clearing On Soil Properties, At Cheetah Conservation Fund Farm In Otjozondjupa Region, Namibia

AbstractThe thesis discusses the problem of bush clearing as they affect soil quality, its productivity and environment in the semi-arid areas. In this case, land clearing came as a result of bush encroachment control mechanism. Bush encroachment is a form of land degradation present prominently in semi-arid areas. Namibia is affected by bush encroachment on a massive scale. The phenomenon is currently understood to affect large part of the country, causing severe economic losses for Namibia,...

Multi-Scale Assessment Of Habitat Use By Black Rhinos (Diceros Bicornis Bicornis Linnaeus 1758) In Northwest Namibia

TABLE OF CONTENTSContents iList of figures viList of tables viiiAcknowledgments ixAbstract xDeclaration xiCHAPTER 1 11. INTRODUCTION 11.1 General introduction 11.2 Problem statement 31.3 Specific objectives 41.4 Key questions 41.5 Research predictions 5CHAPTER 2 82. LITERATURE REVIEW 8ii2.1 Background on black rhinoceros 82.2 Distribution of black rhinoceros: historical and current range 92.3 Conservation and management 102.4 General ecology and habitat preferences 122.5 Browse availability 1...

Impact Of The Tsumeb Smelter Waste On Plant Species Diversity And Structure In Tsumeb, North-Central Namibia.

ABSTRACTThe objective of this study was to determine the impact of the smelter waste on plant species diversity and structure in the Tsumeb area. The most important sources of contamination are solid and gaseous emissions from the Tsumeb Smelter, airborne particles from the Tsumeb tailings pond and airborne particles from slag mill waste. Six sites: Inside Smelter Site, Outside Smelter Site, Abattoir Hill Site, Transnamib Site, Nomtsoub Site and Airport Site were selected and ten 10 m x 10 m ...

Assessment Of Livestock Depredation By Spotted Hyena (Crocuta Crocuta) In Villages Surrounding Ruaha National Park

ABSTRACTThe study to assess livestock depredation by spotted hyena was conducted in six villages surrounding Ruaha National Park which were systematically selected along the gradient of distance from the park. The closest village was Tungamalenga that is 37 km from the park while other villages were: Makifu village (39km), Mapogolo village (42km), Mahuninga village (49km), kitisi village (50km) and Idodi village 52km. Data collection involved 121 households that were selected through snowball...

Assessment of ergonomic practices in garment production workshops in madina, accra and their impact on output.

ABSTRACT The purpose of the study was to assess the ergonomic practices of garment producers in Madina, Accra. A simple random sampling technique was used to select 100 registered members of the Madina Branch of the Tailors and Dressmakers Association. The results were hand-coded and presented using frequency and percentage distributions, pie and bar charts. The chi-square statistic was used to test the hypothesis. The respondents were aged between 19 and 44 years. Eighty-one per cent w...

Perceptions of Climate Variability Effects on Household Water Availability And Health: A case Study of Four Rural Communities in Ghana.

ABSTRACT Globally, one of the major contributors to diseases burden and mortality are waterborne diseases and sanitation-related infections. The study sought to investigate the implications of climate variability on water availability and its implications for public health. Cross tabulations, Chi-square statistic and a logit model were used to identify determinants of water availability and the determinants of water-borne diseases. Data for the study was collected via a survey of women ...


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