Philosophiae Doctor - PhD (Biodiversity and Conservation Biology)
http://hdl.handle.net/11394/27
2024-03-28T10:52:04ZSalt tolerance and modification of wheat salt resistance by plant hormones
http://hdl.handle.net/11394/10242
Salt tolerance and modification of wheat salt resistance by plant hormones
Adam, Muftah Ahmed
The history of salt tolerance and the factors effecting salt resistance of plants were literature surveyed, and it was concluded that ion
concentration, salt accumulation, compatible solutes and the genetic traits play a major role in the salt tolerance of plants. Differences in salt
resistance of wheat cultivars were investigated at the germination and early seedling stages. Considerable intervarietal differences in salt
resistance between wheat cultivars were reported. The interaction between salinity and plant hormones was studied and showed that N6-
benzyladinin treatments caused some changes in some parameters that were studies, GA3 treatments showed more effects on these parameters of salt stressed plants. This study showed that the treatment with some organic acids, citric acid and malic acid, did not cause significant changes in the parameters measured of the wheat plants. No effects on seed germination were due to the decreases in the pH value due to the GA3 treatment were found. The study concludes that treatment of salt stressed wheat cultivars with GA3 could alleviate some of harmful effects of high salt levels, and that it could be useful to treat plants grown in brackish soil or saline environment.
Philosophiae Doctor - PhD
2004-01-01T00:00:00ZSnake community structure in a heterogeneous fynbos ecosystem
http://hdl.handle.net/11394/9538
Snake community structure in a heterogeneous fynbos ecosystem
Cloete, Bryan Nathan
Snakes occur in most terrestrial ecosystems, forming an integral part of many ecological
communities. A diverse community of snakes in an ecosystem can indicate a complex habitat
structure capable of supporting a diverse assemblage of faunal species. I utilised multiple
non-invasive and non-lethal trapping methods to quantify diversity metrics for the snake
community occurring in a heterogeneous fynbos ecosystem within the Koeberg Private
Nature Reserve (KPNR) over one-year period. Additionally, I sampled the species richness
and abundance of snake predators and prey within the reserve and tested the hypothesis that
the snake community was impacted by the abundance and diversity of snake predators and
prey. I performed several statistical analyses to identify the factors that influence the snake
community structure observed in KPNR.
>Magister Scientiae - MSc
2022-01-01T00:00:00ZConservation and resource-use relations: Analysis for protected area expansion feasibility in the Western Cape
http://hdl.handle.net/11394/9491
Conservation and resource-use relations: Analysis for protected area expansion feasibility in the Western Cape
Dyssel, Michael
It is assumed that expanding the size and/or number of protected and conservation areas can contribute
to more effective conservation, ecosystem services and environmental protection. Expansion is
normally a response to continuous environmental threats and subsequent needs to enhance the
protection and conservation of valuable biodiversity, geodiversity and heritage assets. Targets for
global, regional and country-based protected area expansion are set and driven by conservation
authorities across different geographical scales – from the global International Union for the
Conservation of Nature (IUCN) to the local-level protected area.
Philosophiae Doctor - PhD
2022-01-01T00:00:00ZAutecology of the rhombic egg-eater, Dasypeltis scabra
http://hdl.handle.net/11394/9372
Autecology of the rhombic egg-eater, Dasypeltis scabra
Barends, Jody Michael
Efforts to prevent global losses of biodiversity are hindered by incomplete knowledge of the functional importance of species. In part, this is due to a paucity of information on the basic biology of most species resulting in a poor understanding of their ecological roles. Snakes represent a speciose group of carnivorous predators that are likely important ecological components of a variety of environments given their roles in modulating the sizes of the populations of their prey. Unfortunately, the ecological importance of most species of snakes has yet to be empirically demonstrated, particularly in native systems.
Philosophiae Doctor - PhD
2022-01-01T00:00:00Z