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Dissertations / Theses on the topic 'Cave insects'

Author: Grafiati

Published: 3 June 2025

Last updated: 1 August 2025

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1

Muwanga-Zake, Johnnie Wycliffe Frank. "Insect herbivores associated with Senecio pterophorus and Senecio inaequidens at Butterworth, South Africa." Thesis, Rhodes University, 1995. http://hdl.handle.net/10962/d1005402.

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This study lists and compares insect herbivores of Senecio inaequidens and of Senecio pterophorus around Butterworth by 18 Tables and 38 Figures. The two plant species are widely distributed around Southern Africa. Samples were taken during a month of each of the four main seasons of the year, which in Butterworth did not show much difference in temperature. The two plant species shared generalist insect herbivores most of which were also on other surrounding plant species. The population of most of the herbivores was affected by the seasons while the two plant species were not seasonal, thus

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2

Hepburn, Colleen. "Composition and phenology of insect pests of Capsicum (Solanaceae) cultivated in the Makana District, Eastern Cape Province, South Africa." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1005339.

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Capsicum baccatum var. pendulum was first grown in the Makana District in 2005. Extremely little was known about best practices for cultivation or the insects and diseases associated with the crop in this area. The study was conducted during the second year of production, November 2005 and November 2006, in an attempt to identify the composition and phenology of insects occurring on C. baccatum. In the more rural parts of the Eastern Cape, and more particularly in Grahamstown, there are very few industries. With the advent of this new agricultural venture, a processing factory has been opened

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3

Gilbert, James David Jensen. "The evolution of parental care in insects." Thesis, University of Cambridge, 2007. https://www.repository.cam.ac.uk/handle/1810/265485.

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This thesis concentrates on evolutionary costs and benefits of insect parental care. I use phylogenetic methods to test large-scale hypotheses, and field studies to test proximate hypotheses. Initially I look at the evolution of variation in the sex performing care, reconstructing transitions across insect evolutionary history. Consistent with theory, early insects had no care, and their descendants evolved either male care, or female care followed sometimes by biparental care. Secondly, I investigate parental care trade-offs. I find that in insects, care is associated positively with offsprin

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4

Utsunomia, Camila 1989. "Impacto da expressão heteróloga de xilose redutases e xilitol desidrogenases de diferentes leveduras na produção de etanol por Saccharomyces cerevisiae." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316808.

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Orientadores: Gustavo Henrique Goldman, Juliana Velasco de Castro Oliveira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-25T09:59:21Z (GMT). No. of bitstreams: 1 Utsunomia_Camila_M.pdf: 2245062 bytes, checksum: 1803b81f54da154433e6d40c34e2b884 (MD5) Previous issue date: 2014<br>Resumo: A produção de etanol a partir de resíduos agrícolas, denominada Etanol de Segunda Geração ou Etanol Lignocelulósico, surge como uma alternativa para aumentar a produção de etanol sem necessariamente expandir as áreas destinadas ao cu

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5

Booth, David. "Sensory ecology of nocturnal insects : two evolutionary case studies." Thesis, University of Sussex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404156.

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6

Apinda-Legnouo, Emelie Arlette. "The conservation value of artificial ponds in the Western Cape Province for aquatic beetles and bugs." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/587.

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7

Weyl, Philip Sebastian Richard. ""Is more, less?" : insect-insect interactions in a biological control context using water hyacinth as a model." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005410.

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Interactions between insects have been shown to be important regulators of population abundances and dynamics as well as drivers of spatial segregation and distribution. These are important aspects of the ecology of insects used in biological control and may have implications for the overall success of a particular programme. In the history of biological control there has been a tendency to release a suite of agents against a weed, which in some cases has increased the level of success, while in others little change has been observed. In most of these cases the implications of increasing the l

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8

Salvador, Gabriela. "Regulação da atividade do tecido adiposo de Diatraea saccharalis (Fabricius) (Lepidoptera: Crambidae) parasitada por Cotesia flavipes (Cameron) (Hymenoptera: Braconidae)." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-19042010-151948/.

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Ao longo do processo evolutivo, parasitóides desenvolveram a habilidade de manipular inúmeros processos fisiológicos de seus hospedeiros. Entre os efeitos induzidos pelo parasitismo, incluem-se alterações no ambiente nutricional, sistema endócrino e imunológico do hospedeiro, além da manipulação da capacidade de síntese protéica de seus tecidos. O tecido adiposo é o principal órgão de síntese de proteínas em insetos e a manipulação de sua atividade é de fundamental importância para o sucesso do parasitismo. Este trabalho teve por objetivo avaliar a expressão gênica do tecido adiposo de Diatrae

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9

Contador, Mejías Tamara Andrea. "Benthic Macroinvertebrates of Temperate, Sub-Antarctic Streams: The Effects of Altitudinal Zoning and Temperature on the Phenology of Aquatic Insects Associated to the Robalo River, Navarino Island (55°S), Chile." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc103303/.

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The Cape Horn Biosphere Reserve, within the remote Sub-Antarctic ecoregion is a reservoir of expressions of biological and cultural diversity. Although it is considered one of 24 wilderness areas remaining in the world, it is not free from local and global threats, such as invasive species, and climate change. Field biologists and philosophers associated to the Sub-Antarctic Biocultural Conservation Program and the Omora Ethnobotanical Park, have worked to describe the region’s biocultural diversity, linking ecological and philosophical research into education, ecotourism, and conservation, th

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10

DeWildt, Chris. "Conservation Studies of Insect Cave Faunas in Mammoth Cave National Park and Ghana, West Africa." TopSCHOLAR®, 2007. http://digitalcommons.wku.edu/theses/393.

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As part of a long term ecological monitoring effort at Mammoth Cave National Park, a blind cave beetle, Neaphaenops tellkampfi, was collected and data on populations trends gathered from September 2005 through December 2006 in Great Onyx Cave. The sex and age of each individual in each of 15 sites were determined and density trends of the entire population was measured. The species was chosen due to its role as an indicator species, since potential anthropogenic threats to the environment can be detected via population response. This was the initial implementation of a new monitoring method an

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11

Zachariades, Costas. "Complex interactions involving the Cape fig, Ficus sur Forsskål, and its associated insects." Thesis, Rhodes University, 1995. http://hdl.handle.net/10962/d1005338.

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The inadequacy of arbitrarily classifying interactions between species as antagonistic, neutral or mutualistic has become clear in recent years. Both direct and indirect interactions between species can vary between mutualism and antagonism, depending on the intrinsic and extrinsic contexts of the interaction. This study investigated the characteristics of an ant-plant-homopteran interaction in southern Africa. The polyphagous homopteran Hilda patruelis (Tettigometridae) feeds primarily on the trunk-borne fruiting branches and figs of the Cape fig tree, Ficus sur, and produces honeydew which a

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Vrdoljak, Sven Michael. "The conservation value of habitat remnants for flower visiting insects in the lowlands of the Cape Floristic Region." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5280.

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Thesis (PhD(Agric) (Conservation Ecology and Entomology))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: See full text document for abstract<br>AFRIKAANSE OPSOMMING: sien volteks dokument vir die opsomming

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Botes, Antoinette. "Insect macroecological patterns along an altitudinal gradient : the Greater Cederberg Biodiversity Corridor." Thesis, Stellenbosch : Stellenbosch University, 2006. http://hdl.handle.net/10019.1/21552.

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Dissertation (PhD)--University of Stellenbosch, 2006.<br>ENGLISH ABSTRACT: The central goal in macroecology is to determine species diversity patterns across ecological gradients. Altitudinal and latitudinal patterns in species richness are often assumed to be analogous. Furthermore, the primary mechanisms underlying richness patterns along these two gradients might be similar. To date, few studies have tested whether the hypotheses proposed to explain latitudinal richness variation apply to patterns across altitude. This study therefore tests several hypotheses proposed to explain patter

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14

Rock, Kat. "How much do we care about biting insects? : modelling the dynamics of vector-borne diseases." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/63017/.

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Mathematical models of disease can aid understanding of, and provide a framework for, the study of disease spread and control. Vector-borne diseases are not only amongst the most significant diseases but also require tailored mathematics to model the specific biological interactions important in their spread. A key model in vector-borne epidemiology is the Ross-Macdonald ODE model. Simplification of this model using the quasi-equilibrium assumption (QEA) allowed stability and bifurcation analysis to be performed. The QEA was then used to examine the effect of avian malaria upon the Hawaiian ho

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15

Kehinde, Temitope Olatayo. "Effects of vineyard management and landscape context on taxonomic diversity and interaction networks of flower-visiting insects in the Cape Floristic Region biodiversity hotspot." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17980.

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Thesis (PhD)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Both taxonomic diversity and diversity of species interaction networks are experiencing declines as a result of agricultural intensification at habitat and landscape scales. Reversing this trend is a key conservation issue, particularly for important functional groups such as flower-visiting insects and the networks within which they interact. This is of great concern in regions of high conservation priority such as the Cape Floristic Region (CFR), known for its high level of floral and faunal endemism and exceptional speci

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16

Dhladhla, Busisiwe I. R. "Enumeration of insect viruses using microscopic and molecular analyses: South African isolate of cryotophlebia leucotreta granulovirus as a case study." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1008395.

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Baculoviruses have been used as biocontrol agents to control insect pests in agriculture since the 1970s. Out of the fifteen virus families known to infect insects, baculoviruses offer the greatest potential as insect biopesticides, due to their high host specificity which makes them extremely safe to humans, other vertebrates, plants and non-target microorganisms. They comprise of two genera: nucleopolyhedroviruses (NPVs) and granuloviruses (GVs). The South African isolate of Cryptophlebia leucotreta granulovirus (CrleGV-SA) which is infectious for the false codling moth (FCM), Thaumatotibia

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17

El, Hajj Rachelle. "Exploring the potential of emerging technologies in the transformation chain of insects : case of Tenebrio molitor larvae." Electronic Thesis or Diss., Compiègne, 2023. http://www.theses.fr/2023COMP2748.

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Cette thèse vise à explorer l'utilisation de deux technologies émergentes, la Détente Instantanée Contrôlée (DIC) et les Champs Électriques Pulsés (CEP), comme prétraitements pour la transformation des vers de farine dans un concept de bioraffinerie. Les impacts de ces technologies sur la décontamination microbienne des larves, la mortalité (mise à mort), le brunissement enzymatique, le pressage mécanique pour la délipidation et la déshydratation, et le séchage des larves ont été étudiés. Le procédé conventionnel de blanchiment à l'eau chaude a été utilisé comme référence pour la comparaison.

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18

Mkize, Nolwazi. "Insect pests of cultivated and wild olives, and some of their natural enemies, in the Eastern Cape, South Africa." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005403.

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This thesis has two focuses. The first problem facing the olive industry in the Eastern Cape is the growers’ perceptions of both what the industry will provide them and what a pest management program might entail. The second focus is the biology of olive pests in the Eastern Cape in terms of understanding their populations and their natural enemies on private farms, with future hopes of understanding how Integrated Pest Management strategies can be developed for this crop. Eastern Cape private farmers, small-scale farmers and workers from agricultural training institutions were interviewed reg

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19

Cambon, Marine. "Heterogeneity within infections : the case of the vector-borne insect pathogen, Xenorhabdus nematophila." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30308.

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De nombreuses études ont jusqu'ici considéré les infections comme étant des interactions deux-à-deux, entre un hôte et un pathogène, minimisant ainsi la complexité du processus infectieux. En effet, les infections sont souvent très hétérogènes, menant à des interactions plus complexes. Au cours de ce travail, nous cherchons à répondre à deux questions: (i) La transmission d'un pathogène peut-elle être impactée lorsque de l'hétérogénéité phénotypique apparaît dans sa population au cours de l'infection ? (ii) Comment les pathogènes interagissent-ils avec la communauté bactérienne généralement as

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20

Kadango, Tendayi Lovemore. "Farmers' perceptions of insect pests in the Eastern Cape maize-based cropping systems and the effects of crop residue management on insect pest populations." Thesis, University of Fort Hare, 2018. http://hdl.handle.net/10353/6202.

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Maize (Zea mays L.) is one of the most important crops in South Africa that is cultivated for food, feed and as a cash crop. Maize in the Eastern Cape is typically grown for consumption and the Province is one of the least producers owing to small landholdings, poor production conditions and pests. This study investigated: (i) the different maize cropping systems smallholder farmers practice in the Eastern Cape (EC), (ii) the major maize insect pests within the identified cropping systems, (iii) the perceptions of Eastern Cape smallholder maize farmers on the effects of insect pests, and (iv)

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21

Roessler, Christian George. "TWO CASE STUDIES OF PROTEIN FOLD EVOLUTION: BACTERIOPHAGE CRO PROTEINS AND INSECT SALIVARY LIPOCALINS." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194488.

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Natural proteins can evolve new three-dimensional structures through mutations in their amino acid sequence. For protein families that exhibit such structural diversity, a major challenge is to understand the scope and nature of structure variation and its relationship to sequence evolution. The Cordes laboratory has begun using transitive homology-based methods to identify, target and structurally characterize natural sequences intermediate between pairs of proteins with distant sequence similarity and different structures. As a proof of principle, this dissertation describes structural studi

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Canelles, Trabal Quim. "Incorporating insect pest outbreaks to landscape modelling: the case of Cydalima perspectalis invasion in Europe." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/673842.

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Les plagues d’insectes són elements integrats a la dinàmica del paisatge forestal. Tot i això, durant les últimes dècades, han experimentat un augment en nombre i impacte, implicant conseqüències severes pels ecosistemes i la societat. Els motius d’aquesta dinàmica són principalment els canvis en l’ús del sòl, els canvis en el clima i la introducció d’espècies invasores degut al comerç internacional i a la mobilitat humana. L’objectiu central d’aquesta tesi és avançar en el coneixement de l’impacte de les plagues d’insectes al paisatge forestal i integrar-lo en eines de modelització que ajuden

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23

Kemp, Jurene Ellen. "Untangling mechanisms structuring insect diversity patterns in the Cape Floristic Region : the Restionaceae and their herbivores." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96067.

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Thesis (MSc)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Research into the patterns and drivers of insect diversity in the Cape Floristic Region (CFR) lags far behind that of plants. Here I sample insect herbivore communities on a dominant plant family (Restionaceae), and use a spatially nested sampling design and network analysis to evaluate the association between plant and insect diversity in the CFR. I find that plant species richness predicts insect richness better than environmental factors. Turnover in insect communities is strongly associated with turnover in plant (both

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Hoang, Hue, and Matilda Widerström. "Simulation of distributed windings using the insert technique." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-17430.

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During the insert process when the windings of an electric motor are pushed into the stator slots, some detrimental phenomena can occur that affect the efficiency and life of the motor. To detect these phenomena and optimize the process, a simulation would be useful. An investigation of the possibility to perform a simulation, using an appropriate numerical method for the insert process of distributed windings in a permanent magnet synchronous motor, was performed. During the project, a literature study was carried out to investigate existing methods and key-parameters for the simulation of th

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Paterson, A. S. F. "Conditions of experimental learning : a case study of INSET." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301697.

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Cumpsty, Lynn. "Understanding an education partnership : the case of get inset." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/7946.

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Bibliography: leaves 231-240.<br>This study focuses on one particular educational partnership i.e. the Partnership established to plan and manage GET inSET, a teacher in-service (Inset) project in the Western Cape. The Partners in this project were the Western Cape Education Department (WCED), four education Non Governmental Organisations (NOOs) and a Funder, the D G Murray Trust (DOMT). My study endeavours to understand the nature of this partnership i.e. exploring and understanding this very complex social process of collaboration. In this dissertation I flrstly present a selection of 'WTiti

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Smith, Tamara Jane. "The diamondback moth, Plutella xylostella (L.), (Lepidoptera: Plutellidae) and its biological control in the Eastern Cape Province, South Africa." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1004742.

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The diamondback moth, Plutella xylostella (L.), is a pest on crucifer crops worldwide, damaging the leaves, florets and seed pods of many crucifers including cabbage, cauliflower, broccoli and canola. It has been controlled using broad-spectrum insecticides, but this has led to a rapid build-up of insecticide resistance. In the Grahamstown area of the Eastern Cape Province, South Africa, diamondback moth showed resistance to cypermethrin (a pyrethroid) on commercially grown cabbages. Therefore it is imperative that other methods of control be adopted, including both cultural control and biolog

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Clark, Katherine Elizabeth. "Linking aboveground and belowground insect herbivore interactions : a case study with the vine weevil (Otiorhynchus sulcatus)." Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/6317/.

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Interactions between insect herbivores and host plants are fundamental, shaping both ecosystem functions and community structure. One aspect of insect-plant interactions that has received considerable attention recently is the indirect linkages between aboveground and belowground insect herbivores via a shared host plant. To date, the relationship between a maternal insect aboveground and her soil dwelling offspring has been largely overlooked. This study aimed to examine the interactions between the adult insect and soil dwelling larvae of the vine weevil (Otiorhynchus sulcatus) with referenc

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Marimo, Pricilla. "Gender Impacts of Molecular-Assisted Breeding: The Case of Insect and Disease Resistant Cassava in Nigeria." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/33537.

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Cassava is the main staple crop in Nigeria. Using primary data from four south eastern states in Nigeria, the study assessed the gender impacts of improved cassava varieties. Comparative statistical analysis reveals that total female labor is higher than total male in cassava production, processing and marketing. Women spend more labor days than males for planting, weeding, harvesting, marketing and processing. The total female family labor is higher for adopters of new improved cassava varieties. There is however lower family labor input for both male and female adopters for clearing and plow

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De, Villiers M. (Marelize). "Die gebruik van 'n swaainet vir die monitering en diversiteitsbepaling van insekte op lusern in die Wes-Kaap." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52775.

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Thesis (MScAgric)--University of Stellenbosch, 2002.<br>ENGLISH ABSTRACT: Lucerne is the most important pasture and fodder crop in the winter rainfall area of South Africa. Various pests are known to cause damage to this crop. The use of the sweep net for monitoring pests is a cheap, easy and quick technique. If the sweep net is suitable for the lucerne pests in South Africa, potential pest status can be determined easily and quickly and the necessary precautionary measures taken to prevent crop losses. From a managerial point of view, it is also important to know the composition of the

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Mukwevho, Vuledzani Oral. "The Harlequin ladybeetle Harmonia axyridis (Coleoptera: Coccinellidae) in the Western Cape Province, South Africa: effects on arthropods in urban, agricultural and natural ecosystems." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97870.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Invasive arthropod predators are one of the largest and most diverse groups of invasive insects in the world. Many are generalist predators, with cosmopolitan distributions due to their use as biological control agents in agriculture. Harmonia axyridis (Coleoptera: Coccinellidae), an invasive arthropod predator species native to Asia, which now has a world-wide distribution. It is considered one of the most successful biological control predator species and is generally considered to be economically beneficial. However, negative

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Wardill, Trevor James. "Genetic diversity in the biological control process : Acacia nilotica as a test case /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19170.pdf.

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Van, Heerden Monica Martha Aletha. "'n Poging tot onderwysinnovasie in die Richtersveld." University of Western Cape, 1997. http://hdl.handle.net/11394/7498.

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Doctor Educationis<br>This thesis represents the outcome of an interaction between a participating "outsider" and a group of teachers during which a continued dialogue between theory and practice was pursued. The goal was to enhance the quality of teaching practice in a specific situation on the one hand and on the other, gain deeper insight into the theoretical aspects which have a bearing on classroom practice. The research project was initially started in response to teachers' request for help with the teaching of Afrikaans first language to learners whose home language was Afrikaans, but

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Avosani, Sabina. "Behaviour, ecology, and vibrational manipulation of insect vectors: the case of the meadow spittlebug Philaenus spumarius, with notes on a psyllid pest." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/319182.

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Insects can cause economic and environmental damages by transmitting bacterial pathogens to plants, making the use of control and prevention measures imperative. On the other hand, methods aimed at preventing crop pests’ outbreaks, such as tilling and insecticide applications, pose a threat to human and ecosystems health. Innovative and more sustainable control methods are therefore urgently needed to address farmers’ needs and preserve ecosystem services provided by biodiversity. Biotremology is an emerging science that studies the substrate-borne vibrational signals emitted by insects to com

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Avosani, Sabina. "Behaviour, ecology, and vibrational manipulation of insect vectors: the case of the meadow spittlebug Philaenus spumarius, with notes on a psyllid pest." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/319182.

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Insects can cause economic and environmental damages by transmitting bacterial pathogens to plants, making the use of control and prevention measures imperative. On the other hand, methods aimed at preventing crop pests’ outbreaks, such as tilling and insecticide applications, pose a threat to human and ecosystems health. Innovative and more sustainable control methods are therefore urgently needed to address farmers’ needs and preserve ecosystem services provided by biodiversity. Biotremology is an emerging science that studies the substrate-borne vibrational signals emitted by insects to com

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Gardee, Muhammed Nizaar. "Recovery of vegetation and bees after removal of pine forests by fire in the Limietberg region of the Cape Floristic Region biodiversity hotspot." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97796.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: The present global biodiversity crisis is characterized mostly by loss of species due to habitat destruction but there other major threats – notably invasive alien species. The term “biodiversity hotspot” has been coined to emphasize areas for conservation prioritization – areas that have high biodiversity under threat from habitat destruction, invasive species, etc. The Cape Floristic Region (CFR) in the Western Cape (WC) Province of South Africa has the highest biodiversity of all Mediterranean-type climate regions global

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Davies, Craig. "Air pollution and agricultural insect pests in urban and peri-urban areas of India : a case study of Varanasi." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369059.

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Augustyn, Willem Johannes. "Evolutionary drivers of temporal and spatial host use patterns in restio leafhoppers Cephalelini (Cicadellidae)." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97825.

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Thesis (PhD)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Understanding how divergent selection results in the evolution of reproductive isolation (i.e. speciation) is an important goal in evolutionary biology. Populations of herbivorous insects using different host plant species can experience divergent selection from multiple selective pressures which can rapidly lead to speciation. Restio leafhoppers are a group of herbivorous insect species occurring within the Cape Floristic Region (CFR) of South Africa. They are specialised on different plant species in the Restionaceae family.

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Brossette, Lou. "Intéractions sociales et stratégies de fondation chez deux termites européens invasif et natif." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4013/document.

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Les interactions interindividuelles permettent la transmission de l’information, la dispersion des pathogènes et la mise en place des comportements dans une population. Cette thèse a permis d’évaluer l’influence des interactions sociales sur le succès de fondation colonial des différents reproducteurs de deux termites européens, l’invasif Reticulitermes flavipes et le natif R. grassei. Les résultats révèlent (i) un meilleur succès de fondation des reproducteurs primaires de R. flavipes, (ii) une organisation biparentale des soins aux jeunes toutes espèces confondues et (iii) une communication

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Mkize, Nolwazi. "A contribution to cabbage pest management by subsistence and small-scale farmers in the Eastern Cape, South Africa." Thesis, Rhodes University, 2004. http://hdl.handle.net/10962/d1005342.

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The interaction between farmers, agricultural scientists and extension workers is sometimes overlooked in agricultural entomology. In an attempt to respond to this reality this study examines some foundation of this interaction in relation to the pest management practices of subsistence and small-scale farmers and also highlights the problems that might arise in the implementation of IPM. Problems involving pests occurrence; language barriers; beliefs, knowledge and perception about insects, and visual literacy are examined. The thesis has a two-fold focus, firstly the study of pests on cabbag

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Dharsey, Zorina. "Implementing a resource based inset programme : a case study of natural science teachers /." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/418.

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Lombardi, Giorgio Colombo. "Variation in breeding systems, floral morphology and nectar properties in three co-occurring Erica species with contrasting pollination syndromes." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018567.

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The genus Erica is the most species rich in the Cape Floristic Kingdom, yet there are limited data on the various flower-pollinator interactions and breeding systems for the majority of these species. Until recently research has focussed on predictive floral traits, including flower shape, length of corolla and corolla opening to identify likely pollinators in this genus. Field observations provide an empirical test of such predictions. This study investigated three species of Erica and compared their pollination and breeding systems and floral biology. Research, including field experiments an

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Mesilaakso, Lauri. "Bioinformatic approaches for detecting homologous genes in the genomes of non-model organisms : A case study of wing development genes in insect genomes." Thesis, Uppsala universitet, Evolutionsbiologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-398072.

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Identifying homologous genes, that is genes from a common ancestor, is important in comparative genomic studies for understanding gene annotation and the predicted function of a gene. Several pieces of software, of which the most well-known is BLAST, have been developed for identifying homologues, but this can be challenging in non-model organisms where sometimes poor quality of genome assemblies and lack of annotation make it difficult to robustly identify homologues. The aim of this project was to build a bioinformatic framework for homology detection using genomes from non-model organisms.

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Soyelu, Oluseyi Temitope. "Assessment of plants used for the treatment of cattle wounds and myiasis in Amatola Basin, Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/d1000986.

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Moyo, Sipho. "Alternative practices used by resource-limited farmers to control fleas in free-range chickens in the Eastern Cape province, South Africa." Thesis, University of Fort Hare, 2009. http://hdl.handle.net/10353/393.

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Fleas are one of the major external parasites affecting free range chickens, causing irritation, tissue damage, blood loss and toxicosis which in turn affect quality and quantity of meat and egg production. There are many commercial insecticides available that are effective against fleas. These commercial insecticides have, however become expensive to most resourcelimited farmers and therefore unaffordable, causing farmers to seek low cost alternatives. This study was conducted to document, determine the existence of external parasites in freerange chickens and validate the alternative remedie

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Mudavanhu, Pride. "Performance of sterilized Eldana saccharina Walker (Lepidoptera: Pyralidae) adults in mating and cage trials : further steps towards its control using the Sterile Insect Technique." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71727.

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Thesis (PhD(Agric))--Stellenbosch University, 2012.<br>The sugarcane borer, Eldana saccharina Walker (Lepidoptera: Pyralidae) is the most limiting factor in the South African sugar industry with losses to this insect pest estimated to be at least ZAR60 million per annum. Because of its cryptic nature as well as the fact that E. saccharina is both indigenous to Africa and occurs on several host plants, attempts to control or eradicate it using several available methods have not been very successful. However, the sterile insect technique (SIT) is one of the newer control methods that can be inco

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Fadhila, Audinisa. "Integrating novel circular economy technologies in complex trans-sector value chains : Case study of insect larvae conversion technology within waste and feed value chains." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284339.

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Even as the current linear value chains (LVC) of organic waste and animal feed hold the potential to become circular, these practices continue to pose major environmental risks such as deforestation and overfishing. Therefore, a novel circular value chain (CVC) is proposed, connecting the organic waste stream with animal feed production by the use of insect-based organic waste conversion technology. The Black Soldier Fly (BSF) is chosen as the insect-based conversion technology since it has nutritional properties, which serves both waste treatment and animal feed material production purposes.

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GUEYE, NDIOGOU. "Role des termites dans des plantations forestieres du cap-vert (mbao, senegal)." Paris 6, 1987. http://www.theses.fr/1987PA066413.

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Etude du role des termites dans 3 sites: une foret secondaire et 2 plantations. Les populations de termites sont plus importantes en foret. Le defrichement provoque une chute des effectifs qui se reconstituent ensuite rapidement. En saison seche, les termites s'enfoncent dans le sol. La recolte de bois mort par les termites varie selon la saison. Les termites sont inoffensifs pour les arbres eb bon etat. Par contre, l'action des termites constitue un reel danger pour les jeunes arbres, surtout chez les sujets fletris. Il existe une correlation positive entre le degre de fletrissement et le tau

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Reels, Graham Thomas. "Management strategies for the reed Phragmites australis (CAV.) Steud. at Mai Po Marshes Nature Reserve, Hong Kong, with observations on theassociated insect Fauna." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211835.

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Conti, Bruno Freitas De. "Exigências térmicas e monitoramento de Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crampidae), como suporte ao seu controle biológico." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-04072012-110203/.

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O incremento aos programas de bioenergia em nosso país, aponta para uma provável duplicação da área plantada de cana-de-açúcar, num futuro bastante próximo. Neste contexto, a sustentabilidade da cultura deve ser preservada, evitando-se que sejam colocados em risco os avanços obtidos nas últimas cinco décadas no Controle Biológico de suas pragas. Para tanto, são necessárias pesquisas que atendam às necessidade das diversas etapas de um programa de Controlo Biológico. No presente estudo, avaliou-se o uso de temperaturas diferentes para criar cada fase do desenvolvimento de Diatraea saccharalis (

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