Dissertationen zum Thema „Termites mounds“
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Ilunga, Ngoy Serge. „Impact des termites sur les cycles biogéochimiques du cuivre et du cobalt dans le Katanga (RDC) - Application à la prospection minière“. Electronic Thesis or Diss., Université de Lorraine, 2022. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2022_0207_ILUNGA_NGOY.pdf.
Der volle Inhalt der QuelleKnowledge of the influence of termites on transport of metals of economic interest within the complex of lithosphere, pedosphere and termite mounds is of great interest for geochemical and geological characterization of anomalies in mining prospection. Termites have an important functional role in the structuring of soils, causing chemical enrichment through the vertical transport of minerals exchanged between the deeper horizons and the termite mounds built at the surface. Our objective in this thesis is to evaluate the influence of termites on Cu and Co biogeochemical cycles in a mineral-rich region (Katanga, DRC), with the aim to optimize the utilization of termite mounds in mining prospection. This objective requires a characterization of mineral and organic phases at various scales. To achieve this, firstly, a geochemical mapping of termite mounds of two dominant genera of the region, Macrotermes and Cubitermes, was carried out at the landscape scale in an area that received a geological and soil and rock geochemical mapping. The utilization of termite mounds allowed the identification of lithogeochemical facies reflecting the subjacent geology on a regional scale according to the feeding habits of each termite genus. The spatial distribution of termite mounds also allowed us to follow Cu and Co content evolution according to study area geology. The combination of mineralogical and geochemical data acquired on Macrotermes falciger termite mounds and morphological and chemical characterization of their main constituents at microscopic scale allowed to identify carrier phases of interest metals in termite mounds materials. Similarly, the comparison of geochemical signatures of M. falciger termite mounds and their parent materials allowed to establish a lithogeochemical relationship, identifying the source of provisioning at depth by M. falciger. Finally, the association of geochemical characterization results of termite mounds for four granulometric fractions (0-20 µm; 20-63 µm; 63-200 µm; 200-2000 µm) and results on evaluation of the impact of termites on the constitution of aggregates in termite mounds and/or soils, allowed to specify the most informative granulometric fractions on the presence and mineralization of carrier phases of interest metals in Katanga in termite mound materials. The application of all these methods and all elements collected allowed us to propose a Cu and Co biogeochemical cycle scheme in this system, underlying the use of termite mounds in effective and efficient mining prospection
Vazhacharickal, Prem Jose [Verfasser], und Swetha [Verfasser] Pious. „Mound morphology, antimicrobial properties and isolation of microorganism from various termite mounds across Kerala / Prem Jose Vazhacharickal ; Swetha Pious“. Göttingen : Cuvillier Verlag, 2016. http://d-nb.info/1102186317/34.
Der volle Inhalt der QuelleAbou-Houly, Haitham. „Investigation of flow through and around the Macrotermes michaelseni termite mound skin“. Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/8466.
Der volle Inhalt der QuelleSchmidt, Anna Maria [Verfasser], und Judith [Akademischer Betreuer] Korb. „Insights into the evolution of ‘magnetic’ termites: mound shape and population genetics / Anna Maria Schmidt. Betreuer: Judith Korb“. Regensburg : Universitätsbibliothek Regensburg, 2014. http://d-nb.info/1060889250/34.
Der volle Inhalt der QuelleErpenbach, Arne [Verfasser], Rüdiger Akademischer Betreuer] Wittig und Georg [Akademischer Betreuer] [Zizka. „Termite mounds as islands of diversity in West African savanna landscapes / Arne Erpenbach. Betreuer: Rüdiger Wittig. Gutachter: Rüdiger Wittig ; Georg Zizka“. Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2016. http://d-nb.info/1081306637/34.
Der volle Inhalt der QuelleErpenbach, Arne Verfasser], Rüdiger [Akademischer Betreuer] Wittig und Georg [Akademischer Betreuer] [Zizka. „Termite mounds as islands of diversity in West African savanna landscapes / Arne Erpenbach. Betreuer: Rüdiger Wittig. Gutachter: Rüdiger Wittig ; Georg Zizka“. Frankfurt am Main : Univ.-Bibliothek Frankfurt am Main, 2016. http://d-nb.info/1081306637/34.
Der volle Inhalt der QuelleMoreno, Paola. „Environmental Natural Processes that Achieve Thermal Comfort in Multifamily Buildings in Hot Arid Regions“. Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/603491.
Der volle Inhalt der QuelleRoehl, Katrin, und n/a. „Terminus disintegration of debris-covered, lake-calving glaciers“. University of Otago. Department of Geography, 2006. http://adt.otago.ac.nz./public/adt-NZDU20070502.112854.
Der volle Inhalt der QuelleMahan, Margaret M. „Ecological Impact of Epigeal Termitaria on Vertebrates in the Tsavo Region of Southeast Kenya“. TopSCHOLAR®, 2009. http://digitalcommons.wku.edu/theses/98.
Der volle Inhalt der QuelleZippin, Jessica. „The geochemistry and mineralogy of termite mound soils eaten by chimpanzees, Pan troglodytes, of the Mahale Mountains, western Tanzania“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/MQ33517.pdf.
Der volle Inhalt der QuelleSwift, Andrew J. „The dynamics of mound construction by Microhodotermes viator: termite herbivory and altered soil nutrient status drive plant community change in a karroid shrubland community“. Thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/26395.
Der volle Inhalt der QuelleFernandes, Correa Gilberto. „Les microreliefs "et leur environnement pédologique dans l'ouest du Minas Gerais, région du Plateau Central brésilien“. Nancy 1, 1989. http://www.theses.fr/1989NAN10406.
Der volle Inhalt der QuelleHlongwane, Zanele. „The origin and geomorphological significance of earth mounds in the Mkhuze wetlands, KwaZulu-Natal“. Thesis, 2009. http://hdl.handle.net/10413/8912.
Der volle Inhalt der QuelleThesis (M.Sc.)-University of KwaZulu-Natal, Westville, 2009.
Sousa, Luis Augusto Pereira Nadais de. „Use and reuse of termite-fishing mounds by wild chimpanzees in Tanzania: An archaeological approach to perishable toolsites“. Master's thesis, 2020. http://hdl.handle.net/10316/93922.
Der volle Inhalt der QuelleOs chimpanzés têm sido alvo de diversos estudos focados na utilização de ferramentas. Dado que a sua capacidade de fabricar e usar, de forma flexível e regular, uma vasta gama de utensílios pode ser comparada com as capacidades tecnológicas dos primeiros humanos, são considerados modelos relevantes para a compreensão das nossas origens tecnológicas. Este estudo analisou dados recolhidos através de métodos arqueológicos com o objetivo de investigar o uso e reuso de termiteiras por duas comunidades de chimpanzés em dois habitats distintos na Tanzânia, Gombe e Issa, semelhantes a habitats onde os primeiros humanos terão evoluído. Os resultados indicam que os chimpanzés da comunidade Kasekela em Gombe exploram termiteiras de forma mais intensiva que os seus congéneres de Issa, provavelmente devido às diferenças entre os dois habitats. Ao contrário do que sucede em Issa, a pesca de térmitas ocorre durante todo o ano em Gombe, apesar de ser esporádica durante a estação seca. Em ambos os sítios, foram detetadas pequenas variações na intensidade de exploração. Em Gombe, a dimensão das termiteiras pode influenciar estas variações, mas o mesmo não parece ser verdade para Issa, talvez porque a densidade da população de chimpanzés é baixa neste sítio. Os resultados sugerem também que o descarte das ferramentas perecíveis depois do uso dá origem à criação de sítios de acumulação com maior densidade de artefactos do que sítios de utensílios líticos explorados por primatas, humanos incluídos. Este é o primeiro estudo detalhado sobre a utilização e reutilização de sítios de ferramentas perecíveis, aumentando o conhecimento sobre processos de formação de sítios e acumulação de ferramentas, e fornecendo indicações sobre as escalas temporais, os comportamentos, e a variabilidade representados em sítios arqueológicos relacionados com a presença dos primeiros humanos.
Chimpanzees have been the focus of numerous studies regarding tool-use. Because their flexibility and regular use and manufacture of a diverse range of tools resemble the tool using skills of early humans, they are considered relevant models for the understanding of our technological origins, likely invisible in the archaeological record. This study analysed data collected through archaeological methods to investigate site use and reuse by termite fishing chimpanzees living in two distinct habitats in west Tanzania, akin to habitats where early humans are thought to have lived: Gombe and Issa. The results indicate that the Kasekela community of Gombe chimpanzees exploit termite mounds more intensively than the Issa population, likely due to constraints imposed by the differences between these two habitats. Contrary to Issa, termite-fishing at Gombe occurs throughout the whole year, albeit only sporadically during the dry season. Within each site, small variations in the intensity of tool-site use were detected. At Gombe, these could be influenced by mound-size, but the same doesn’t seem to be true for Issa, probably because chimpanzee density is low at this site. Results also suggest that the discard of perishable utensils results in the creation of accumulation sites with higher concentrations of artefacts than stone tool primate sites, including early humans. This is the first detailed study of perishable tool-sites use and reuse, adding to the knowledge of processes of site formation and tool accumulation, and providing clues to the timescales, behaviours and variability represented at known hominin sites.
Muvengwi, Justice. „Relationships between termite (Macrotermes) mound distribution, plant diversity and large mammalian herbivory patterns in Gonarezhou National Park, Zimbabwe“. Thesis, 2017. http://hdl.handle.net/10539/22729.
Der volle Inhalt der QuelleTermites are widely distributed in tropical and subtropical savanna. They are recognised as major ecosystem engineers through their role in nutrient cycling, decomposition, hydrology and alteration of landscape topography with cascading effects manifesting in ecosystem heterogeneity and productivity up the food chains. In this thesis I addressed the effect of geology on termite species diversity, followed by questioning how the different geologies influence the size and spatial distribution of Macrotermes mounds. Furthermore, I explored the effect of termite mounds emanating from different geologies on herbaceous vegetation heterogeneity and finally the effect this heterogeneity has on grazing intensity. Although the diversity of termites has been explored across different environmental gradients such as rainfall, altitude and disturbance, little is known regarding variation in their diversity across landscapes of varying geology. In my quest to understand how varying geology influences the ecology of termites and their functional importance, I sampled granite and basalt for termite diversity using standard transects (100 m x 2 m). I predicted that termite diversity is higher on nutrient-rich geology following the productivity diversity hypothesis. However, both functional and taxonomic diversity were higher on nutrient-poor granite. Twelve species from three subfamilies representing two feeding groups were recorded on granite whereas on basalt only five species from two subfamilies consisting of one feeding group were recorded. Although the influence of Macrotermes mounds on ecosystem heterogeneity has been well studied, little is known on how the environment (geology) and other termite colonies influence size and distribution pattern, despite how these interactions could influence ecosystem functioning. Termite mounds were sampled in 1 km2 plots, four in each geology. Each mound location was recorded using a hand held GPS and structural variables (height and diameter) measured. The data were analysed for spatial distribution of termite mounds using the software Programita. The general distribution pattern of termite mounds (active and inactive mounds combined) was investigated using both the pair correlation function, g(r), and Ripley’s K(r) function. Termite mounds were larger and covered a significant proportion of the landscape on granite compared to basalt. Mounds were generally over-dispersed on granite and randomly distributed on basalt. Mounds covered ~ 6% of the landscape on granite compared with only ~ 0.4% on basalt. These results show that the significance of termites varies across geologies, being more important on nutrient-poor geologies because of their size and a more productive spatial pattern displayed here. The majority of studies testing mound effects on savanna vegetation spatial heterogeneity have been based on single site observations mostly comparing mounds and their paired savanna control plots. Furthermore studies did not consider the spatial effects of mounds with distance into the savanna matrix from mound edge, and this has rarely been tested across landscapes of varying geologies, as well as across mounds of different sizes. Therefore there was a need to explore this in order to broadly understand the functional importance of mounds. I sampled the herbaceous community on and off termite mounds and along distance transects from mounds on nutrient-rich and nutrient-poor geologies. Termite mounds as sources of spatial vegetation heterogeneity was more pronounced on nutrient-poor granite, with larger mounds having greater effect on vegetation composition and diversity than smaller ones. Mounds harboured compositionally different herbaceous plants compared with the savanna matrix on granite whereas there was no difference on basalt. In acknowledging the effect erosion from mounds may have on vegetation heterogeneity, termite mound effect on composition expressed at landscape level based on mound densities recorded in this study was estimated to be 19% of the landscape on granite whereas on basalt, the mounds influenced ~ 0.4% of the landscape. The choice of foraging sites by large herbivores in the landscape is influenced by food quantity, quality, inter and intra-specific competition and predation risk. Termite mounds harbour highly nutritious herbaceous plants compared to the savanna matrix, which makes them preferred foraging sites. Due to very small differences in soil nutrient content between mounds and savanna on basalt, mounds were expected to have little effect on grazing. In line with the set hypothesis termite mounds largely influenced grazing on the nutrient-poor granite and when viewed at landscape scale, based on mound densities and extent of erosion recorded, mounds influenced ~ 28% on granite and only ~ 0.8% on basalt. Overall my study has demonstrated that the significance of termites as ecosystem engineers varies across landscapes of varying geology, being more important on nutrient-poor compared with nutrient-rich geologies.
MT2017
Kalumanga, Elikana. „How elephants utilize a miombo-wetland ecosystem in Ugalla landscape, Western Tanzania“. Doctoral thesis, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-116286.
Der volle Inhalt der QuelleAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.
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