https://commons.ufh.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28506 Wed 31 May 2023 15:41:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26750 Wed 20 Jul 2022 08:42:27 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28308 Wed 15 Sep 2021 12:38:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26312 Wed 12 May 2021 23:48:07 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26680 Wed 12 May 2021 23:40:48 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26593 Wed 12 May 2021 23:23:43 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27492 Wed 12 May 2021 23:07:32 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26870 Wed 12 May 2021 23:06:43 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26996 Wed 12 May 2021 22:53:00 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28716 Wed 12 May 2021 22:51:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26731 Wed 12 May 2021 22:43:59 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:20519 Wed 12 May 2021 22:26:56 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27400 Wed 12 May 2021 22:26:01 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:21293 Wed 12 May 2021 22:23:56 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28203 Wed 12 May 2021 21:01:40 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28072 Wed 12 May 2021 20:53:20 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28503 Wed 12 May 2021 20:02:27 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28161 Wed 12 May 2021 20:01:04 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26591 Wed 12 May 2021 20:00:07 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28046 2mm) under BSE imagery were identified, with the abundance of gypsum salts (below surface level) and rock coatings indicating active sulphuric acid weathering, in western Dronning Maud Land, Antarctica. Were mechanical processes faster than chemical, weathering rinds and solution features on silicate rocks would be uncommon in the Antarctic, periglacial landscape. However, this is not the case as the existence of these landforms implies that chemical weathering may occur faster than mechanical weathering processes (Pope et al., 1995). In a changing world, one needs to monitor these processes at a micro-scale in order to fully understand how periglacial environments react to global climatic changes, and the subsequent impacts on these sensitive environments.]]> Wed 12 May 2021 19:32:00 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:3811 Wed 12 May 2021 19:30:12 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:21327 Wed 12 May 2021 19:29:44 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26562 0.6), and in the remaining species there was no significant trophic niche overlap. Amietia angolensis showed a larger trophic niche (Levin’s measure; B = 7.7 and Bst = 0.84 downstream, and upstream B = 7.6 (Bst = 0.82) compared to the other species. The gut content analyses showed that frogs feed on a variety of prey items that constitutes food sources from both aquatic and terrestrial habitats. Stable isotopes indicated that aquatic derived sources contributed significantly more towards the diets of X. laevis, A. angolensis tadpoles and S. grayii tadpoles compared with the other anurans, whereas aquatic and terrestrial derived food sources contributed equally to the diets of A. angolensis and S. grayii. Increased trophic positions in A. angolensis and S. grayii occurred throughout their development. The four different species had similar fatty acid profiles in the upstream region, and fairly similar δ13C values, suggesting that they probably consumed similar food. Fatty acid profiles of anurans in the downstream region showed distinct separations among the species. Tadpoles had high levels of diatom-associated fatty acids (20:5ω3; A. angolensis tadpole – 8.4 %, S. grayii tadpole – 9.4 % upstream and downstream; 9.1 and 6.1 % total fatty acids (TFA), respectively). All four species had substantial contributions from bacterial fatty acids, and large proportions of saturated fatty acids (30.6 - 50.0 %) including those with 14 and 18 carbons, indicating that bacterial and detritus food sources played an important role in their diets. The fatty acid profiles revealed high proportions of polyunsaturated fatty acids (PUFAs) and essential fatty acids (EFAs) in all species, indicating a good quality of food and that the quality of food consumed was similar among species. The results demonstrated the usefulness of a combination of traditional techniques (gut content techniques) and biochemical techniques (stable isotopes and fatty acid analysis) for assessing consumption and assimilation. The amphibian assemblages examined derived much of their energy from terrestrial and aquatic sources. This information will allow more precise and comprehensive assessments of trophic interactions in freshwater habitats, along with aiding in future amphibian conservation and management efforts.]]> Wed 12 May 2021 19:28:40 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27811 Wed 12 May 2021 19:16:30 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28717 Wed 12 May 2021 19:14:22 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28591 Wed 12 May 2021 19:06:38 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26592 Wed 12 May 2021 19:00:54 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:25993 Wed 12 May 2021 18:54:50 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26570 Wed 12 May 2021 18:40:26 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26576 Wed 12 May 2021 18:38:11 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27040 Wed 12 May 2021 18:33:38 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28712 Wed 12 May 2021 18:32:08 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28598 Wed 12 May 2021 18:27:23 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4175 Wed 12 May 2021 18:11:26 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26752 Wed 12 May 2021 17:42:52 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27807 Wed 12 May 2021 17:38:22 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:21259 10 kg) carnivores has resulted in a variety of conservation measures being put into practice to prevent extinctions. The establishment of predator-proof fences around protected areas has been a successful tool for reducing human-predator conflict. Furthermore, the re-introduction of large carnivores into small (< 1 000 km²), enclosed reserves has aided in the conservation of many species. Cheetahs (Acinonyx jubatus) and lions (Panthera leo) have benefitted from such re-introductions. The re-introduction of cheetahs before lions into the Mountain Zebra National Park (MZNP) in the Eastern Cape Province of South Africa provided a unique opportunity to study the effects of lions on an already established cheetah population. Spatial data were downloaded remotely from GPS collared individuals (n=4) and cheetah kill data were collected using the GPS cluster method before (2012-2013) and after (2013-2014) the lion (n=3) re-introduction. The same methods were used for lion kill data collection once they had been re-introduced. In general, cheetah home range size did not change after the lion re-introduction. Cheetahs selected areas with a combination of open and closed vegetation covers, while lions selected either open or closed areas of vegetation covers. In addition, as vegetation cover became thicker, the presence of cheetahs decreased. The cheetahs preyed upon seven species before and 11 species after the lion re-introduction. Medium sized prey comprised the bulk of the cheetah diet with kudu (Tragelaphus strepsiceros) and springbok (Antidorcas marsupialis) being the preferred species both before and after the lion re-introduction. The lion diets consisted of medium to large sized prey, with the male lions selecting eland (Tragelaphus oryx) and buffalo (Syncerus caffer) and the lioness selecting red hartebeest (Alcelaphus buselaphus). The cheetahs had no significant dietary overlap with the lions and there was only one record of kleptoparasitism. The results of my study indicate that cheetahs are able to co-exist with lions when lions are at low densities in an enclosed reserve. The cheetahs did not experience landscape-level displacement because they made fine-scale adjustments to avoid lions within their environment. This adaptability may have important management implications for future re-introductions of cheetahs into enclosed game reserves.]]> Wed 12 May 2021 17:37:06 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26639 Wed 12 May 2021 17:31:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:20376 Wed 12 May 2021 17:27:22 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28367 116 Moz of endowment and contribute to making south-west Ghana the greatest Paleoproterozoic gold province in the world. Gold deposits in the Kumasi Basin are shear zone hosted and mineralisation ranges from disseminated to massive sulphide refractory deposits, to free milling quartz vein style deposits. Structural relationships and age dating indicate that most deposits are genetically related and were formed during a single episode of gold mineralisation during the D4 NNW-SSE crustal shortening deformation event of the Eburnean Orogeny (2125 – 1980 Ma). The understanding of structural controls on mineralisation is critical for exploration success as it allows exploration to focus on areas where these structural controls exist. This study uses a mineral systems approach to understand the relationship between the geodynamic history and structural controls on gold mineralisation in the Kumasi Basin at various scales, and define targeting criteria which can be applied for the purpose of developing predictive exploration models for making new discoveries in the Asanko Gold Mine camp located in the Asankrangwa Belt. The study used a quantitative analysis to establish residual endowment potential in the Asankrangwa Belt, providing the basis for a business model and resulting exploration strategy. Once established, a Fry autocorrelation analysis was applied to identify trends in deposit and camp spatial distribution to which critical geological processes were ascribed. Observed trends were mapped from multi-scale geophysical data sets and through interpretation of existing geophysical structure models, and structural criteria for targeting orogenic gold deposits at the regional and camp scales were developed. Results show that different structural controls on mineralisation act at the regional and camp scale. At the regional scale the distribution of gold camps was found to be controlled by fundamental N-S and NW-SE basement structures with gold camps forming where they intersect NE-SW first and second order structural corridors. At the Asanko Gold Mine camp scale, deposit distribution was found to be related to the intersection between major second order D3 NE-SW shear zones, minor third order D4 NNE-SSW brittle faults, and cryptic NW-SE upward propagating basement structures. In addition to these structural criteria, deposits in the Asanko Gold Mine camp were found to be aligned along a NNE-SSW lineament caused by the interaction between the N-S basement structure and the NE-SW trending Asankrangwa Belt shear corridor.]]> Wed 12 May 2021 17:27:00 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28201 Wed 12 May 2021 17:17:07 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:21331 Wed 12 May 2021 17:14:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28554 Wed 12 May 2021 16:45:43 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26753 Wed 12 May 2021 16:45:09 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28211 Wed 12 May 2021 16:44:41 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27435 Wed 12 May 2021 16:40:58 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27014 Wed 12 May 2021 16:39:54 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26769 Wed 12 May 2021 16:25:40 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:20739 Wed 12 May 2021 16:21:32 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28715 Wed 12 May 2021 16:17:31 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28542 Wed 12 May 2021 16:09:18 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26595 Wed 12 May 2021 16:05:26 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26581 Wed 12 May 2021 15:54:01 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28536 Wed 12 May 2021 15:52:54 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28711 Wed 12 May 2021 15:47:48 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:41186 Wed 12 May 2021 14:40:49 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:40976 Wed 12 May 2021 14:02:26 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28387 Tue 16 May 2023 14:59:05 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:21330 Tue 15 Aug 2023 11:29:32 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28605 Tue 13 Jun 2023 12:32:30 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28701 Tue 10 Jul 2018 16:05:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:20381 Thu 29 Sep 2022 14:28:44 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28386 Thu 22 Jul 2021 15:55:21 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4794 Thu 13 May 2021 07:32:21 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4700 Thu 13 May 2021 07:28:05 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28392 Thu 13 May 2021 07:14:39 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27441 Thu 13 May 2021 07:08:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:20393 Thu 13 May 2021 06:58:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26992 Thu 13 May 2021 06:38:26 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29391 Thu 13 May 2021 06:19:50 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28404 Thu 13 May 2021 06:13:40 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:20726 Thu 13 May 2021 05:55:16 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27816 Thu 13 May 2021 05:41:05 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:4838 Thu 13 May 2021 05:38:18 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:20803 Thu 13 May 2021 05:25:23 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27812 Thu 13 May 2021 05:20:12 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28693 Thu 13 May 2021 05:17:29 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26609 2.5Ga) and are located to the south and east of Lake Victoria on the Tanzania craton. The Tanzania Craton is surrounded by Usagaran 1.9 Ga rocks (the east African orogenic belt (EAO) better known as the Mozambique belt) to the east and the Ubendian belt to the south and west. Published reports show that the eastern part of the Tanzania Craton is dominated by the fragments of Archaean rocks. Metamorphism along East Africa and the Tanzania Craton is due to several geological events. These geological events include the intrusion of granites in the Archaean Tanzania Craton (3 Ga), subduction of ocean plate resulted to the formation of Usagaran belt (1.9 Ga), opening and closure of Mozambique Ocean, which resulted in the formation of the Mozambique belt between 700 – 800 Ma and the Pan African orogeny at 640 – 620 Ma, which is associated with the formation of Gondwana. It is believed that fragments from the Archaean Tanzania craton were re - metamorphosed during these events. The Handeni project (the focus of this thesis) is located in the northern portion of the eastern part of the Usagaran belt (1.9 Ga) comprising the eastern part of Archaean Tanzania Craton. The area is characterized by Proterozic rocks of basaltic composition. The documented 2.7 Ga rocks at the Kilindi Handeni Superterrane at the northern part of the Usagaran belt correlate well with 2.7 Ga of Nyanzian rocks of Archaean Tanzania craton. The Handeni project area is geologically dominated by metamorphosed and deformed units of quartzofeldspathic gneisses, migmatitic gneiss, garnet silicified rock, garnetiferous amphibolite, garnetiferous granulite, graphitic schist and hornblende pyroxenite. Intensive deformation features that were developed include folds (sheath folds, micro and macro scales), faults, shears and regional thrusts. This thesis focuses on identifying the protolith of the rocks, alteration minerals, and metamorphic assemblages in the project area in order to understand the timing of gold mineralization. Geological investigation of core, ore petrology and mineralogy, mineral composition by using JEOL microprobe analysis and XRF analysis of bulk rocks were utilized. All the analytical work was done at the Geology laboratory, Rhodes University. Petrographic analysis shows that the rocks sampled in the study area are characterized by alteration minerals such as calcite, dolomite and sericite. Sulphide minerals including chalcopyrite, pyrrhotite, pyrite, pentlandite and gersdorffite were identified. Gold mineralization is associated with disseminated sulphides in association with trace amounts of base metals. Four rock types were proposed as host rocks for the mineralization, namely garnet silicified rock with superimposed quartz veins, garnetiferous amphibolite, garnetiferous granulite and hornblende pyroxenite. Fold troughs, filled fractures associated with episodes of folding, quartz veins and shear zones are suggested as gold precipitation sites. The presence of high grade metamorphic rocks containing gold, intermediate to low grade assemblages with sulphides and associated hydrothermal alteration as well as a complex deformation history suggests that the Handeni mineralization took place over an extended time period stretching from a ductile to a brittle environment.]]> Thu 13 May 2021 05:05:57 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27541 Thu 13 May 2021 04:56:35 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27364 Thu 13 May 2021 04:05:45 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28592 Thu 13 May 2021 03:43:13 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28514 Thu 13 May 2021 03:32:04 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28599 Thu 13 May 2021 03:29:39 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26594 Thu 13 May 2021 02:50:03 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27477 Thu 13 May 2021 02:25:16 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26764 Thu 13 May 2021 02:18:22 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27802 Thu 13 May 2021 01:47:20 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28555 Thu 13 May 2021 01:46:27 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28105 Thu 13 May 2021 01:32:49 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:20720 3100 m were recorded, their flight skills seemed inadequate. Future management considerations include the initiation of a pre-release exercise regime, the establishment of an acclimatization enclosure removed from the breeding site, and a varied or reduced post-release feeding schedule. Fledglings should be relocated and housed at the release enclosure until they are four years old.]]> Thu 13 May 2021 00:49:15 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27465 Thu 13 May 2021 00:47:31 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26590 Thu 13 May 2021 00:39:44 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:21274 slopes> vertical surfaces> tide pools> crevices. The current study found that, while the pulmonate limpets, Siphonaria capensis and S. serrata, preferred rock pools, sloped, vertical and horizontal rock surfaces, the patellogastropod limpets, Cellana capensis and Scutellastra granularis, preferred rock pools and vertical rock surfaces. Furthermore, the pulmonate limpets were only common on horizontal rock surfaces where specific ameliorating conditions would have mitigated thermal stress there. In addition, C. capensis had similar thermal tolerance limits to the pulmonate limpets in air and the pulmonate limpets had similar and/or higher thermal tolerance limits compared to S. granularis in water. This indicates that the pulmonate limpets did not necessarily prefer warmer microhabitats than the patellogastropod limpets and that there were no differences in the collective upper thermal tolerance limits between the two limpet groups in either medium.Consequently, there was no indication from this study that an assumed superior capacity for oxygen supply translates into greater thermal tolerance and that the hypotheses based on the OCLTT were not supported. Although this was an indirect test of the OCLTT theory, I conclude that this study does not support the notion of its general applicability and that mechanisms other than those outlined by the OCLTT theory may help explain the patterns of thermal limitation observed in the current study.]]> Thu 13 May 2021 00:11:29 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26314 Thu 13 May 2021 00:01:00 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29390 Sat 04 Dec 2021 12:43:33 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28702 Mon 29 Jan 2024 14:44:58 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28417 Mon 22 May 2023 15:47:55 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27617 Fri 19 May 2023 09:37:03 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:27038 Fri 17 Sep 2021 10:11:50 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:26596 Fri 09 Jun 2023 15:34:31 SAST ]]>