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Ekologiese studie van 'n natuurlewebestuursplan vir die Honnet-Natuurreservaat, noordelike provinsieVisser, Nelmarie January 1995 (has links)
Vir die wetenskaplike bestuur van natuurreservate is die toepassing
van ekologiese kennis nodig om die vooraf bepaalde
doelstellings te bereik. Dit is dus noodsaaklik dat die bestuurder
die fundamentele ekologiese beginsels verstaan en kan
toepas. Die klimaat, geologie en grande van die Honnet-natuurreservaat
word aan die hand van beskikbare literatuur bespreek. Die
klimaat van die gebied kan as semi-aried beskou word. Die
belangrikste geologiese formasies is basalt, Clarenssandsteen,
doleriet, alluvium en ijoliet. Vyf grondvorme naamlik Hutton,
Glenrosa, Oakleaf, Dundee en Mispah kom op die reservaat voor.
Die plantegroei is met behulp van die Braun-Blanquet-benadering
geklassifiseer en die strukturele beskrywing deur van die Varieerbare-kwadrantperseelmetode gebruik te maak. Twaalf plantgemeenskappe
met vier variasies is onderskei en gekarteer. Ses
bestuurseenhede is op grand van kenmerkende plantgemeenskappe
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grondvorm en topografie onderskei.
Die veldtoestand is met behulp van drie verskillende metodes
bepaall waarvan die ekologiese indeksmetode die aanvaarbaarste
resul taat gel ewer het. Die veldtoestand is swak met 1 n telling
van 360 vir die totale studiegebied. Die weikapasiteit vir die
studiegebied is 29 GVE. Die droemassa-produksie van die graslaag
is in elke bestuurseenheid bepaal en 1 n gemiddeld van
345.4 kgjha is vir die totale studiegebied verkry.
Die beskikbare blaarmateriaal vir elke bestuurseenheid en die
totale studiegebied is bepaal. Op dies 1.5 m1 >1.5-2.0 m en
>2.0-5.0 m hoogteklasse was 4 090.0 kgjha 1 2 605.2 kgjha en 8
990.6 kgjha blaarmateriaal onderskeidelik beskikbaar.
'n Regressievergelyking tussen die produksie van die graslaag
en boomdigtheid (ETBE) word met ander soortgelyke studies
vergelyk. Die positiewe korrelasie in die studiegebied teenoor
die negatiewe korrelasie deur ander navorsers gevind kan moontlik aan die oormatige oorbeweiding en vertrapping van die
reservaat toegeskryf word. Die bevolkingstruktuur, habitat- en voedselvoorkeure van die
verskillende grater soogdiersoorte is ondersoek. Die dierebevolkings
is gesond. Die gemsbok en rooihartbees kom nie natuurlik
in die gebied voor nie en 'n werklik geskikte habitat
vir die waterbok 1 bestaan nie op die reservaat nie. Dit word
aanbeveel dat die diersoorte van die reservaat verwyder word.
Vraelyste is aan besoekers uitgedeel om vas te stel aan watter
tipe aktiwiteite hulle sal deelneem 1 waarvolgens 1 n voorkeur
vir staproetes 1 wildkykritte en swem bestaan. Voorstelle vir
omgewingsopvoeding en verskillende aspekte van toerisme word
gemaak. 'n Oornagvoetslaanroete word aanbeveel en is reeds ui tgemerk. Die wei- en blaarvreetkapasiteit vir die reservaat is onderskeidelik
28.2 GVE en 180 BVE waarvolgens wildladings aanbeveel
is. Aanbevelings word· vir algemene wild- en veldbestuur,
onder andere gereelde wildtellings, monitering van
veldtoestand en oop- en toemaak van waterpunte gemaak.
Passiewe aanpassingsbestuur word aanbeveel waardeur wildgetalle
aangepas word volgens die reenval en veldtoestand. 'n Beslui tnemingsmodel
word aangebied wat as riglyn en hulpmiddel in die
neem van bestuursbesluite kan dien. / Dissertation (MSc)--University of Pretoria, 1995. / gm2013 / Animal and Wildlife Sciences / unrestricted
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Kaapse AfrikaansKlopper, Rembrandt. Marius January 1983 (has links)
Philosophiae Doctor - PhD / This study entails an analysis of the inherent grammatical and phonological variation which are characteristic of Cape Afrikaans. On the basis of the inherent variation which is documented in the preliminary part of this study, the relationship between inherent
phonological variation and language change is analyzed by means of a deductive validation procedure in the central part of it. In the first ..chapter the epistemological basis of this study is set out, and a review is given of various empirical validation procedures, and criticism of linguistic analysis by means of deductive validation is evaluated. The research methodology, i.e. the field work and quantification
techniques for the deductive analysis of Afrikaans· cassette recordings of 139 Cape Afrikaans respondents is documented in chapter two.
In the third chapter it is argued that the proposed analysis of inherent linguistic variation and languáge change can best be conducted within the framework of the sociocultural context of pragmatic language use rather than within a theory of linguistic competence The fourth chapter commences with a brief review of the various domains of language change and is followed by evidence from a wide
variety of languages which suggests that sociocultural factors play a major role during language change. The chapter is concluded with
the proposal that language change can best be studied within the framework of linguistic -variation which William Labov pioneered. The fifth chapter consists of a review of phonological, lexical and syntactic variation inherent in cape Afrikaans. The findings of this study are reported in the sixth and final chapter. The study concludes that inherent linguistic variation forms the basis for the sociocultural stratification of Cape
Afrikaans and that tt also serves as the mechanism for linguistic change in this variety of Afrikaans.
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The current water quality situation at clinics in the Limpopo Province and subsequent management suggestions / Jan Hendrik StanderStander, Jan Hendrik January 2010 (has links)
South Africa's water resources are, in global terms, scarce and extremely limited (DWAF, 2004).
Groundwater is a valuable source of potable water in South Africa. It was found that most of the health
facilities in the Limpopo Province depend on groundwater as sole source of potable water.
Groundwater quality is to a great extent influenced by the dominant land use in the vicinity of an
aquifer. It is therefore important to carefully manage possible pollution sources of anthropogenic origin.
This may be seen as pro–active water quality management that may result in significant saving on water
treatment.
This aim of this study is to obtain a regional view of the water quality situation at clinics and other health
facilities in the Limpopo Province. It was found that the general water quality at health facilities in the
Province is questionable. It is of concern to note that 56% of health facilities use water that is
unacceptable for human consumption.
Water quality may be managed by introducing appropriate treatment options to treat the water to ideal
water quality standards. This dissertation explores some treatment options used at health facilities in
the Province. The efficiency of these treatment systems is also investigated. / Thesis (M.Sc. (Geography and Environmental Studies))--North-West University, Potchefstroom Campus, 2011.
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The current water quality situation at clinics in the Limpopo Province and subsequent management suggestions / Jan Hendrik StanderStander, Jan Hendrik January 2010 (has links)
South Africa's water resources are, in global terms, scarce and extremely limited (DWAF, 2004).
Groundwater is a valuable source of potable water in South Africa. It was found that most of the health
facilities in the Limpopo Province depend on groundwater as sole source of potable water.
Groundwater quality is to a great extent influenced by the dominant land use in the vicinity of an
aquifer. It is therefore important to carefully manage possible pollution sources of anthropogenic origin.
This may be seen as pro–active water quality management that may result in significant saving on water
treatment.
This aim of this study is to obtain a regional view of the water quality situation at clinics and other health
facilities in the Limpopo Province. It was found that the general water quality at health facilities in the
Province is questionable. It is of concern to note that 56% of health facilities use water that is
unacceptable for human consumption.
Water quality may be managed by introducing appropriate treatment options to treat the water to ideal
water quality standards. This dissertation explores some treatment options used at health facilities in
the Province. The efficiency of these treatment systems is also investigated. / Thesis (M.Sc. (Geography and Environmental Studies))--North-West University, Potchefstroom Campus, 2011.
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Die ekologie en plantegroeibestuur van die Olifantriviersisteem (Afrikaans)Myburgh, Willem Johannes 29 May 2006 (has links)
Please read the abstract in the section 00front of this document / Thesis (PhD (Botany))--University of Pretoria, 2006. / Plant Science / unrestricted
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Limnoecology of the freshwater algal genera (excluding diatoms) on Marion Island (sub-Antarctic) / Wilma van Staden.Van Staden, Wilma January 2011 (has links)
The aim of this study was to identify the algal genera found in the different freshwater bodies on Marion Island, to relate the presence or absence of the genera to the chemistry of the water bodies and to group the genera according to their limno-chemical preferences. The Island's freshwater algal genera were also compared with genera found on other Southern Ocean islands.
The major factors influencing the chemical composition of the freshwaters of the island are the surrounding ocean and the manuring of seals and seabirds. The Western and Southern lakelets and wallows had higher mean conductivity values than most of the other water bodies. Eastern Inland lakelets, crater lakes and glacial lakes had low ion and nutrient concentrations, since they are mainly situated inland, away from bird or seal colonies. The chemical composition of wallows was influenced by manuring of seals and seabirds. The freshwaters are acidic and lakelets tend to be more acidic than glacial lakes. The lentic waters were more acidic than the stream.
In total, 106 genera, mainly belonging to Chlorophyta (60 genera; 56% of total) and Cyanophyta (29 genera; 27% of total), were found in the freshwaters on the island. Other algal divisions found were Chrysophyta (7 genera), Euglenophyta (4 genera), Pyrrophyta (2 genera) and Xanthophyta (4 genera). Mean number of genera per sample ranged from 8 (in wallows) to 16 (in Eastern Inland lakelets). Filamentous algae were present in all the samples. Abundant green algae were Cosmarium, Klebsormidium, Mougeotia and Oedogonium. The most common cyanobacteria were Lyngbya and Chroococcus. The filamentous yellow-green alga, Tribonema, was also common.
There were distinct differences in the algal composition between the southern, western and northern lakelets and the lakelets on the eastern side of the island. Sixty percent of the algal genera were present in waters with low conductivity values. Trichodesmium, Sphaerocystis and Tolypothrix occurred in freshwater bodies with higher conductivity values.
Variance analysis showed that 87 of the 106 genera were less likely to occur in nitrogen and phosphate containing waters. Chlamydomonas, Prasiola, Spirogyra Trachelomonas, Tribonema, Ulothrix and Xanthidium were among the genera commonly found in nitrogen and phosphate containing waters. Diversity (number of genera per sample) was negatively correlated with conductivity, PO4-P, NH4-N and NO3-N. Diversity declined significantly with increasing salinity and eutrophication. Genera likely to occur in acidic waters include Binuclearia, Chlamydomonas, Chroococcus, Cosmarium, Klebsormidium, Microspora, Oedogonium, Oocystis, Prasiola, Scenedesmus, Staurastrum, Stigeoclonium, Tetrastrum, Ulothrix, Lyngbya, Synura and Tribonema.
Marion Island’s algal flora shows a high affinity with that of Îles Kerguelen and Crozet, both located in the same biogeographical province (South Indian Ocean Province) of the sub-Antarctic than Marion Island, and a lesser affinity with islands in other sub-Antarctic provinces. Algal genera were grouped according to their limno-chemistry preferences. / Thesis (MSc (Environmental Sciences))--North-West University, Potchefstroom Campus, 2012.
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Limnoecology of the freshwater algal genera (excluding diatoms) on Marion Island (sub-Antarctic) / Wilma van Staden.Van Staden, Wilma January 2011 (has links)
The aim of this study was to identify the algal genera found in the different freshwater bodies on Marion Island, to relate the presence or absence of the genera to the chemistry of the water bodies and to group the genera according to their limno-chemical preferences. The Island's freshwater algal genera were also compared with genera found on other Southern Ocean islands.
The major factors influencing the chemical composition of the freshwaters of the island are the surrounding ocean and the manuring of seals and seabirds. The Western and Southern lakelets and wallows had higher mean conductivity values than most of the other water bodies. Eastern Inland lakelets, crater lakes and glacial lakes had low ion and nutrient concentrations, since they are mainly situated inland, away from bird or seal colonies. The chemical composition of wallows was influenced by manuring of seals and seabirds. The freshwaters are acidic and lakelets tend to be more acidic than glacial lakes. The lentic waters were more acidic than the stream.
In total, 106 genera, mainly belonging to Chlorophyta (60 genera; 56% of total) and Cyanophyta (29 genera; 27% of total), were found in the freshwaters on the island. Other algal divisions found were Chrysophyta (7 genera), Euglenophyta (4 genera), Pyrrophyta (2 genera) and Xanthophyta (4 genera). Mean number of genera per sample ranged from 8 (in wallows) to 16 (in Eastern Inland lakelets). Filamentous algae were present in all the samples. Abundant green algae were Cosmarium, Klebsormidium, Mougeotia and Oedogonium. The most common cyanobacteria were Lyngbya and Chroococcus. The filamentous yellow-green alga, Tribonema, was also common.
There were distinct differences in the algal composition between the southern, western and northern lakelets and the lakelets on the eastern side of the island. Sixty percent of the algal genera were present in waters with low conductivity values. Trichodesmium, Sphaerocystis and Tolypothrix occurred in freshwater bodies with higher conductivity values.
Variance analysis showed that 87 of the 106 genera were less likely to occur in nitrogen and phosphate containing waters. Chlamydomonas, Prasiola, Spirogyra Trachelomonas, Tribonema, Ulothrix and Xanthidium were among the genera commonly found in nitrogen and phosphate containing waters. Diversity (number of genera per sample) was negatively correlated with conductivity, PO4-P, NH4-N and NO3-N. Diversity declined significantly with increasing salinity and eutrophication. Genera likely to occur in acidic waters include Binuclearia, Chlamydomonas, Chroococcus, Cosmarium, Klebsormidium, Microspora, Oedogonium, Oocystis, Prasiola, Scenedesmus, Staurastrum, Stigeoclonium, Tetrastrum, Ulothrix, Lyngbya, Synura and Tribonema.
Marion Island’s algal flora shows a high affinity with that of Îles Kerguelen and Crozet, both located in the same biogeographical province (South Indian Ocean Province) of the sub-Antarctic than Marion Island, and a lesser affinity with islands in other sub-Antarctic provinces. Algal genera were grouped according to their limno-chemistry preferences. / Thesis (MSc (Environmental Sciences))--North-West University, Potchefstroom Campus, 2012.
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The availability of foster care resources in the Free State Province : a social work assessment / by M. Kok.Kok, Magdelena Cornelia January 2012 (has links)
A large number of children find themselves in foster care situations in South Africa with placements that have to be monitored by social workers. This is a demanding task, given the nature of foster placements and the high caseloads of social workers responsible for monitoring of foster placements.
Although a wealth of information on resource management is to be found in the prevailing literature, no comparative volume of information is to be found on foster care resources in child welfare in particular. A model for resource management in this field must still be developed.
In view of this and considering the role occupied by the researcher in the Kerklike Maatskaplike Diens: Bloemfontein, Free State, South Africa, it was decided to embark on a research project investigating the use of resources in the field of child welfare, specifically with foster care social workers. The aim of the study is to assess whether adequate resources are available.
The availability and utilisation of resources in the field of child welfare is under-researched and a resource management system for this purpose should still be developed.
The research results indicated that social workers monitoring foster care placements have high caseloads and that resources, even though they are utilised to a certain extent, are not always accessible or effective.
The most important learning needs were related to organisational, community and professional resources that could be considered unrealistic, ineffective, inaccessible and not feasible in most circumstances. Further main challenges are a lack of resources and time, a lack of co-operation from the foster parents and the biological parents respectively and the shortage of foster care social workers in South Africa. / Thesis (MSW)--North-West University, Potchefstroom Campus, 2013.
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The availability of foster care resources in the Free State Province : a social work assessment / by M. Kok.Kok, Magdelena Cornelia January 2012 (has links)
A large number of children find themselves in foster care situations in South Africa with placements that have to be monitored by social workers. This is a demanding task, given the nature of foster placements and the high caseloads of social workers responsible for monitoring of foster placements.
Although a wealth of information on resource management is to be found in the prevailing literature, no comparative volume of information is to be found on foster care resources in child welfare in particular. A model for resource management in this field must still be developed.
In view of this and considering the role occupied by the researcher in the Kerklike Maatskaplike Diens: Bloemfontein, Free State, South Africa, it was decided to embark on a research project investigating the use of resources in the field of child welfare, specifically with foster care social workers. The aim of the study is to assess whether adequate resources are available.
The availability and utilisation of resources in the field of child welfare is under-researched and a resource management system for this purpose should still be developed.
The research results indicated that social workers monitoring foster care placements have high caseloads and that resources, even though they are utilised to a certain extent, are not always accessible or effective.
The most important learning needs were related to organisational, community and professional resources that could be considered unrealistic, ineffective, inaccessible and not feasible in most circumstances. Further main challenges are a lack of resources and time, a lack of co-operation from the foster parents and the biological parents respectively and the shortage of foster care social workers in South Africa. / Thesis (MSW)--North-West University, Potchefstroom Campus, 2013.
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Possible endocrine disruption in molluscs from the Limpopo Province / Ignatius Michael ViljoenViljoen, Ignatius Michael January 2010 (has links)
With parts of SA in a malaria endemic area, a preventative way of fighting
malaria is with the use of pesticides such as 1,1,1–Trichloro–2,2–bis(pclorophenyl)
ethane, also known as DDT. DDT is listed under the persistent organic
pollutants (POPs) and considered an endocrine disruptive compound (EDC) under
the Stockholm Convention. SA registered an exemption to use DDT as means to
fight malaria. DDT and its isomers are, however, known EDCs. Combined with their
ability to persist in the environment while not being target specific motivates further
studies into possible detrimental effects.
The present study aimed to establish if ED was present by comparing the
male reproductive organs from snails from an area currently sprayed with DDT (for
malaria control) to an area not sprayed with DDT in the Limpopo Province. A possible
endpoint (the penis sheath/preputium length ratio or PSPLR) was identified for the
freshwater snail Bulinus tropicus.
B. tropicus and sediment samples were collected from DDT–sprayed and nonsprayed
areas located close together. The snails were dissected and various
morphometric parameters measured. Sediments from the sites where the snails were
collected were analysed for DDT using GC–MS.
Statistical analysis showed significant differences in PSPLR (and therefore
possible ED) between snails from the two areas. The difference in PSPLR values
was mainly due to a relatively shorter preputium for the snails from the DDT–sprayed
area. Even though the sediment samples showed that DDT was present in most of
the DDT–sprayed sites and not in the non–DDT sprayed sites, causality of the
possible ED could not be established from this field study. This study indicated the
possibility of using the PSPLR as endpoint for ED. Recommendations are made for
further development of the PSPLR and B. tropicus as biological indicators for
endocrine disruption, but causality must first be established. / Thesis (M.Sc (Environmental Science))--North-West University, Potchefstroom Campus, 2011.
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