Dissertations / Theses: 'Beetles'

1

DeGomez, Tom, and Deborah Young. "Pine Bark Beetles." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2009. http://hdl.handle.net/10150/146729.

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DeGomez, Tom, and Deborah Young. "Pine Bark Beetles." College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/550373.

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Revised; Originally Published 2002
4 pp.
Pine bark beetles in Arizona are generally of the genus Ips or Dendroctonus. Fading foliage in the tree is often the first sign of a beetle attack. Prevention is best practiced since control is not possible once the beetles have successfully colonized the tree. Colonization is dependent upon trees being in a vulnerable condition caused by stress from various agents and site conditions.

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Schalau, Jeff. "Cypress Bark Beetles." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/144794.

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2 pp.
Other Forest Health Publications
Cypress bark beetles are native insects that often impact ornamental Arizona cypress and Leyland cypress trees. Healthy, vigorous cypress trees can usually withstand substantial beetle pressure. However, significant mortality of host tree species often occurs during periods of extended drought. Tree vigor can easily be maintained through deep, infrequent irrigation during drought periods.

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Schalau, Jeff. "Cypress Bark Beetles." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011. http://hdl.handle.net/10150/239598.

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Eyres, M. D. "Aspects of the distribution of water beetles and ground beetles (Coleoptera)." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332348.

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6

Carrington, Terry R. "Factors influencing habitat selection and activity of ground beetles (Coleoptera: Carabidae) in central Appalachia Part I : The influence of soil and soil surface characteristics on habitat selection by Carabidae ; Part II : Precipitation and temperature fluctuations : effects on Carabidae activity ; Part III : The effects of two microbial insecticides for gypsy moth control on Carabidae populations /." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2368.

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Thesis (M.S.)--West Virginia University, 2002.
Title from document title page. Document formatted into pages; contains viii, 114 p. : ill., maps. Vita. Includes abstract. Includes bibliographical references.

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7

Stribling, James B. "World generic revision of Ptilodactylidae (Coleoptera, dryopoidea) /." Connect to resource, 1986. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1273752066.

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8

Foley, Ian Andrew. "A review of the ironclad beetles of the world (Coleoptera Zopheridae: Phellopsini and Zopherini) /." Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/foley/FoleyI0806.pdf.

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Phellopsis LeConte is revised. Phellopsis porcata (LeConte) is returned to valid status and P. yulongensis NEW SPECIES is described. Phellopsis montana Casey NEW SYNONYMY (NS) and P. robustula Casey NS = P. porcata (LeConte). Phellopsis imurai Masumoto = P. amurensis (Heyden) NS. Species redescriptions, a key to species and notes on the history, biology and biogeography of the group are provided. Phylogenetic analyses support several changes to sustain monophyletic genera of Zopherini because the genera Meralius Casey, Nosoderma Solier, and Phloeodes LeConte were found to be polyphyletic. The genus Sesaspis Casey NEW STATUS is re-recognized, and redescribed to include the following species: Sesaspis denticulata (Solier), S. emarginatus (Horn) NEW COMBIATION (NC), S. lutosus (Champion) NC, S. doyeni (GarciÌa-PariÌs et al.) NC, S. adami NEW SPECIES, S. ashei NEW SPECIES, and S. triplehorni NEW SPECIES. Phloeodes LeConte is clarified with 10 new synonymies [P. diabolicus (LeConte) = P. pustulosus (LeConte) NS, P. latipennis Casey NS, P. ovipennis Casey NS, P. elongatus Casey NS, P. scaber Casey NS, P. angustus Casey NS, and P. remotus Casey NS). Phloeodes plicatus (LeConte) = Noserus torvus Casey NS, Noserus collaris Casey NS, Noserus corrosus Casey NS, Noserus convexulus Casey NS]. Phloeodes venustus (Champion) NC is supported as a member of this clade extending the known range of the genus into Central America. Noserinus furcatus (Kirsch) NC is moved from Meralius Casey. Meralius clavapilus NEW SPECIES is described from Venezuela. Eleven new synonyms are proposed in Nosoderma Solier (N. championi Casey NS, N. prominens Casey NS, N. senex Casey NS, N. brevicolle Casey NS, and N. subglabrum Casey NS = N. inaequalis (Say); N. interruptum Champion NS = N. insigne Champion; N. carinatum Champion NS, N. anceps Champion NS, N. impressum Champion NS, and N. longipennis Casey NS = N. exsculptum Champion; and N. squalidus Casey NS = N. guatemalensis Champion). Scoriaderma congolense Fairmaire NS is a junior synonym of Nosoderma scabrosum Solier. Keys to the genera of Zopherini and species of Meralius Casey, Noserinus Casey, Nosoderma Solier, Phloeodes LeConte and Sesaspis Casey are provided, with illustrations of all included species of the genera mentioned.

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9

Johnson, Shelley. "Pollen digestion in flower-feeding Scarabaeidae : protea beetles (Cetoniini) and monkey beetles (Hopliini)." Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/6106.

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Bibliography: leaves 95-104.
Beetles pollinate over 80% of all flowering plants and feed on the two most common floral rewards, nectar and pollen. Pollen is nutritionally very valuable, being a rich protein and carbohydrate source. However, the hard and highly resistant outer wall (exine) of the grain is an obstacle that pollen-feeders must overcome in order to benefit from the pollen's nutritious protoplasm. There are a variety of mechanisms that pollen-feeders may use to deal with the exine. Collembolans secrete exinase that breaks down the wall, but other pollen-feeders do not produce this enzyme. Pollen-feeders that are unable to ingest grains may either pierce the grain and suck out the contents (thrips and biting-flies) or cause the grain contents to leach out an imbibe the leachate (butterflies and the eucalupt nectar fly). Pollen-feeders that can ingest the grains (bees, syrphid flies, rodents, marsupials, bats and birds) may use osmotic shock, pseudo-germination, exudation, microbial digestion or enzyme penetration to gain access to the protoplasmic contents. Further study is needed to define the details of these methods and whether they are all in use.

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10

Warner, Douglas James. "The potential of carabidae in the control of insect pests of winter oilseed rape." Thesis, University of Hertfordshire, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366035.

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11

Obeng-Ofori, Daniels. "Monitoring of stored product beetles." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317834.

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12

Blake, Max. "Conservation genetics of saproxylic beetles." Thesis, Aberystwyth University, 2017. http://hdl.handle.net/2160/cfdb958e-da35-463c-b65c-37fb9a4febdc.

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Saproxylic beetles feed on decayed dead wood, representing some of the most ecologically important fauna in mature forests dominated by veteran trees, though this habitat is a shadow of its former self in Britain and Europe; confined to a handful of unconnected sites it remains nationally important for the diverse community assemblage it supports. Saproxylics can mediate and manipulate the fungal decay of wood, though this knowledge about the keystone status of saproxylic beetles is still poorly understood, despite some saproxylic beetles being some of the largest and most charismatic invertebrates in Europe. Habitats for saproxylics have been carved up over the course of human development, whilst forestry management practices encouraged the ‘tidying up’ of woodland by removing dead wood, leading to localised extinctions of saproxylics throughout Britain and Europe. Even in cases where extinction/threatened statuses are formally recognised servicing of conservation plans is constrained by limited understanding of their biodiversity. In this research the development and application of a suite of morphological, genetic, and ecological simulation approaches to characterise various components of saproxylic beetle diversity is described. This study focusses on three saproxylics: the Stag Beetle (Lucanus cervus), the Noble Chafer (Gnorimus nobilis), and the Bee Beetles (Trichius spp.). For Stag Beetles, the first microsatellites were developed and utilised along with mitochondrial (mtDNA) Cytochrome Oxidase 1 sequencing to perform a preliminary genetic analysis. mtDNA supported the predominance of a single clade across the species’ distribution which exhibited signatures of historical expansion/contractions linked to glacial/interglacial periods. Both mtDNA and microsatellites revealed a markedly lower level of genetic variation among UK samples compared to continental European counterparts and the implications for sustainability and remedial actions are discussed. For Gnorimus nobilis, a rot-hole specialist confined in England to traditional orchards, geometric and mtDNA sequence analysis characterised and confirmed differences between it and its relative, the Variable Chafer (G. variabilis), as well as supporting recognition of other proposed sub-species. A salient feature of the intraspecific genetic variation was the deep divergence between the Eastern and Western clades, indicating historical vicariance and limited post-glacial overlap between clades. For Trichius, analysis of three distinct species revealed three reciprocally monophyletic mtDNA clades. However, despite support for three distinct morphotypes, there was a high level of mtDNA/ morphological incongruence, i.e. multiple morphotypes were associated with a single clade. Nuclear DNA sequencing supported the hypothesis that the pattern has been generated by historical vicariance and introgression upon secondary contact. Species Distribution Modelling of multiple saproxylics (n=14) indicated that many species had similar glacial refugia: a northern refugium across France and Germany was predicted for many species. In addition, many species were predicted to find the Mediterranean region increasingly unsuitable under climate change simulations, but are also predicted to find suitable climates opening up toward the north-east of Europe. The project represents the first combined study of morphological taxonomy, phylogeography, population genetics and habitat modelling in rot-hole associated beetle species across Europe, and should help direct conservation efforts for these and other saproxylic beetles.

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13

Roslin, Tomas. "Spatial ecology of dung beetles." Helsinki : University of Helsinki, 1999. http://ethesis.helsinki.fi/julkaisut/mat/ekolo/vk/roslin/.

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14

Botes, Antoinette. "Heterogeneity of dung beetle (Coleoptera: Scarabaeidae) assemblages in northern KwaZulu-Natal, South Africa : conservation implications." Pretoria: [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-11212005-111029.

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15

Ober, Karen Ann. "The evolution of arboreal carabid beetles." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289746.

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The diversity of many groups of organisms is related to the evolution of features that contribute to rapid radiations. This project reconstructed the phylogeny of carabid beetles in the subfamily Harpalinae, a speciose group of terrestrial predators. The phylogenetic inference focused on the sister group relationships, the monophyly of the subfamily and the tribal relationships within harpalines. Molecular sequence data, primarily from 28S ribosomal DNA and the wingless gene, were collected from more than 200 carabid beetles. Parsimony, minimum evolution distance, maximum likelihood, and Bayesian phylogenetic analysis methods were used to reconstruct the phylogeny of harpalines. Brachinine bombardier beetles and austral psydrines were found to be closely related to the harpaline clade. Within harpalines, zuphiites formed a clear clade as did pseudomorphines + graphipterines + orthogoniines. However the lebiomorph assemblage and the tribe Lebiini were not monophyletic. With the use of harpaline phylogenetic hypotheses, the evolution of the arboreal lifestyle was elucidated within the subfamily, including the rate and number of origins and losses of arboreality. Correlated evolution of several morphological characters and habitat was explored. Significant correlation of adhesive subtarsal setae and bilobed fourth tarsomeres on carabid legs were found with arboreality and may be arboreal adaptations, while long legs and long elytra are probably not associated with arboreality. The relationship of other morphological characters with arboreality is not clear. Harpalines may have been part of a rapid radiation of species diversity, where many lineages invaded new ecological niches and evolved novel morphological features to become adapted to their environment.

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16

Arndt, Eric Michael. "How beetles explode : new insights into the operation, structure, and materials of bombardier beetle (Brachinini) defensive glands." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98639.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2015.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 97-105).
Bombardier beetles possess one of the most remarkable defense mechanisms in nature, using explosions inside their bodies to synthesize and eject a hot, noxious spray at attackers. The chemical reactions that enable this process are well understood, but many aspects of the beetles' two-chambered defensive glands, which house the explosions and produce the defensive spray, remain unexplored. In this Thesis, I describe our recent progress in understanding the operation, structure, and materials composition of the defensive glands-topics which have to date received little treatment in the literature-of the best-known bombardier beetles, the brachinines (Carabidae: Brachininae: Brachinini). Chapter 2 deals with the pulsed-jet character of brachinines' sprays, which is in contrast to all other types of bombardier beetles that emit their sprays as continuous streams. Brachinine sprays comprise a number of spray pulses emitted in a rapid sequence, each pulse formed in a discrete explosion event inside the reaction chamber of the defensive gland, with the frequency of pulsation ranging from 300 to 1000 Hz. Using a combination of high-speed synchrotron x-ray phase-contrast imaging of live beetles, anatomical studies of the excised defensive glands, and mathematical analyses, we determined that spray pulsation arises due to explosion-induced displacement of the inlet structures to the reaction chamber periodically cutting o the ow of reactant solution into the reaction chamber. In Chapter 3, the interior cuticular microsculpture of the reaction chamber is studied using scanning electron microscopy and synchrotron x-ray phase-contrast microtomography. The microscupture is found to be highly complex, with a number of distinct spiny microtextures localized to specific regions of the reaction chamber. Quantitative details of the spine lengths and spacings are reported, and on the basis of the similarity of some of the features to the beetles' external abdominal microscupture and the micro-textural transitions observed inside the reaction chamber, we hypothesize that the reaction chamber microsculpture is homologous with the exterior microsculpture, consistent with the fact that the defensive glands are invaginations of the abdomen. Chapter 4 reports our preliminary investigations of the materials composition of the defensive glands. We use scanning electron microscopy to examine the fibrous composite structure of the gland cuticle and employ various light microscopy techniques to understand spatial variations in the cuticle sclerotization and chemical composition. The reaction chamber is found to exhibit dramatic spatial variation in sclerotization, including several lightly sclerotized regions, and possible functions of these regions are proposed. Additionally, the inter-chamber valve is found to contain the rubber-like protein resilin, likely as an adaptation to allow the valve to consistently make and hold a tight seal during each explosion, in analogy to rubber gaskets used in technological valve applications.
by Eric Michael Arndt.
Ph. D.

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17

Bouchard, Patrice. "Systematics and biogeography of the Australian wet tropics coelometopini (Coleoptera: Tenebrionidae: Coelometopinae) /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16090.pdf.

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18

Greenwood, Matthew E. "Co-baiting for spruce beetles, Dendroctonus rufipennis, Kirby, and western balsam bark beetles, Dryocoetes confusus Swaine, Coleoptera, scolytidae." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ37539.pdf.

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19

Liljestrand, Rönn Johanna. "Male-female Coevolution in Bruchid Seed Beetles." Doctoral thesis, Uppsala universitet, Zooekologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-98162.

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Male-female coevolution is at the heart of biology. It is responsible for much of the diversity we see in behaviour and morphology, and it is thought to be an important engine of speciation. The pattern of intersexual coevolution is well established in many taxa, yet understanding of the processes responsible for male-female coevolution remains incomplete. By studying interspecific variation within a closely related group of species, we can gain important information about how traits and behaviours have evolved. In the work done for this thesis, we studied a group of seed beetle species. Our results show that male-female coevolution has been a strong force in shaping both behaviour and morphological traits that are associated with mating and reproduction such as, morphology of male and female genitalia and remating behaviour. The evolution of harmful male genitalia has often been suggested to be a product of sexually antagonistic coevolution, but understanding of these extraordinary adaptations is limited. By combining comparative and experimental methods we show that as seed beetle males evolve more spiny genitalia, harm to females is elevated. We provide evidence for the correlated evolution between these antagonistic adaptations in males, and a female counter adaptation (the amount of connective tissue in the copulatory duct). We also demonstrate that imbalance of relative armament of the sexes affects evolution of the costs and benefits of reproduction. As males evolve genitalia that are more harmful relative to the level of female counteradaptation, costs associated with mating for females increase and population fitness is depressed. Our results unveil a coevolutionary arms race between the sexes and are consistent with a proposed link between sexual conflict, species’ viability and the risk of extinction.

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Belaoussoff, Svenja. "Carabid beetles as indicators of tillage disturbance." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0023/NQ51029.pdf.

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21

Mate, Nankervis Jason Fernando. "Radiation and diversification of aphodius dung beetles." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402578.

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22

Wilson, Christine Jane. "Chromosomal studies on dung beetles (Coceoptera: Scarabaeoidea)." Thesis, Royal Holloway, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271713.

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23

Leavengood, John Moeller. "The checkered beetles (Coleoptera: Cleridae) of Florida." [Gainesville, Fla.] : University of Florida, 2008. http://purl.fcla.edu/fcla/etd/UFE0023794.

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24

DeGomez, Tom, and Beverly Loomis. "Firewood and Bark Beetles in the Southwest." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2005. http://hdl.handle.net/10150/146723.

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2 pp.
Pine Bark Beetles, Cypress Bark Beetles
Life cycle of the bark beetles and how to detect in firewood. Source of firewood is important. Dry wood is a poor host for bark beetles. Most bark beetles are host specific. Insecticides should not be applied to firewood to prevent bark beetle infestation.

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DeGomez, Tom, and Beverly Loomis. "Firewood and Bark Beetles in the Southwest." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011. http://hdl.handle.net/10150/239575.

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Trillo, Paula Alejandra. "Pre- and post-copulatory sexual selection in the tortoise beetle Acromis Sparsa (Coleoptera Chrysomelidae)." [Missoula, Mont.] : The University of Montana, 2008. http://etd.lib.umt.edu/theses/available/etd-03212009-144120/unrestricted/Trillo_umt_0136D_10003.pdf.

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27

Midgley, John Mark. "Aspects of the thermal ecology of six species of carcass beetles in South Africa." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1005325.

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The forensic application of entomology is well known, but it is generally a field which concentrates on Diptera. Many Coleoptera also have forensic application, but are generally neglected by forensic entomology researchers. Necrophilic Coleoptera are diverse and therefore have application in estimating Post-Mortem Interval (PMI) by community composition, but they are also valuable in estimating PMI by development. In addition, Coleoptera are more common in stored product cases. Six species of forensically important Coleoptera were studied, three from the family Dermestidae (Dermestes haemorrhoidalis, D. maculatus and D. peruvianus) and three from the family Silphidae (Silpha punctulata, Thanatophilus micans and T. mutilatus). The effect of killing method and storage time on larval length was investigated in T. micans. Coleopteran larvae were shown not to behave in the same way as dipteran larvae. In contrast to dipteran larvae, it is recommended that coleopteran larvae be killed using ethanol. A development model is presented for T. micans. This represents the first statistically robust development model for forensically important Coleoptera, and the first development model for forensically important Silphidae. The model offers a method of estimating PMI which can be used once Diptera are no longer present on a corpse. Upper lethal temperature limits for four species of carcass beetle were determined. A comparison between species shows distinct differentiation between families and species. This differentiation accounts for microhabitat differences which these species show on carcasses. Bioclimatic models for the six species showed contrasting distributions, with both widespread and localised species. These models allow forensic investigators to assess whether the absence of a species from a corpse is forensically significant, or a result of the species distributions. Moisture-related variables were shown to be more important in predicting species distributions than temperature at a regional scale. Forensic entomology standards can be adjusted based on the findings of this study. Length was again shown to be an inferior measurement of larval age. Coleopteran development has been shown to be useful, and should be given greater consideration in future work. T. micans has been shown to be capable of locating and ovipositing on carcasses promptly after death, making it a good forensic indicator. Further work is needed for the full potential of necrophilic Coleoptera to be realised.

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Vessby, Karolina. "Distribution and reproduction of dung beetles in a varying environment : implications for conservation of semi-natural grasslands /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5823-4.pdf.

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Bailey-Jourdain, Catherine. "Male age effects, cytoplasmic incompatibility and the localization of Wolbachia in Chelymorpha alternans Boh (Chrysomelidae, Cassidinae)." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100760.

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Wolbachia are bacteria that infect and induce reproductive alterations in a large number of arthropods. The present study was undertaken to improve our understanding of the effects that Wolbachia have on the reproductive biology of the leaf beetle Chelymorpha alternans Boh, in Panama. Two strains of Wolbachia occur in C. alternans, both of which induce some degree of cytoplasmic incompatibility (CI), a reproductive problem occurring when individuals bearing different infection status are mated together resulting in lowered levels of egg fertility. I attempted to localize where Wolbachia occurs in highest density in male reproductive tissues and to see if variation in Wolbachia density was associated with levels of CI in crossing experiments involving males (1) differing in age, (2) carrying different strains and (3) belonging to different populations previously known to vary in their levels of CI. Wolbachia were found to occur only in the somatic cells surrounding the testis, rather than in the germ cells, and yet were capable of inducing strong CI. Male age, infection status and provenance all were factors affecting the level of CI induced.

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Lott, Derek Arthur. "The semi-aquatic habitats of terrestrial Coleoptera in a lowland river floodplain." Thesis, University of Newcastle upon Tyne, 1999. http://hdl.handle.net/10443/3632.

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281 species of terrestrial ground-living beetles were recorded from 69 riparian and wetland sites in the floodplain of the lowland River Soar, England. Differences in species composition between pitfall trapped and timed hand-collected samples were smaller than those attributable to environmental and seasonal factors. Detrended Correspondence Analysis consistently ranked all sites against seasonal variations between April and June and floodplain sites against annual variations. DCA axis 1 scores were slightly better correlated with important environmental variables at the ecohabitat (<5Om) scale rather than the microhabitat scale. Canonical Correspondence Analysis detected assemblage responses to flooding disturbance and grazing pressure along the main channel as well as to water level stability in the floodplain. A conceptual model of floodplain land-use and river management postulated a dynamic equilibrium between flooding disturbances and vegetational succession, producing geomorphic and vegetational structures which serve as semi-aquatic habitats for terrestrial beetle assemblages with appropriate species traits. Impoundment for navigation affects assemblages by modifying the severity of flooding disturbance. The effects of grazing pressure resemble flooding disturbance. The short-term (< 5yr) impact of bank regrading was explained by differences in severity, predictability and frequency compared to the beetles' generation length. Evenness and species richness were affected only by flooding and grazing disturbance. This response was not predicted by the intermediate disturbance hypothesis because the frequencies of flooding and grazing disturbances in the Soar valley are not appropriate to the hypothesis, which more closely relates to disturbance by bank regrading. In comparison to diversity indices, a rarity index was much less sensitive to environmental factors than species diversity indices and more robust against seasonal and yearly fluctuations. Consequently, it has more potential for use in site quality assessment.

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Hopp, Katie Jo. "A revision of the West Indian genus Nesocyrtosoma (Coleoptera: Tenebrionidae)." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/hopp/HoppK1208.pdf.

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Nesocyrtosoma Marcuzzi is revised. There is a total of 45 species of the genus Nesocyrtosoma, 27 of them are newly described here (N. bestiola NEW SPECIES, N. lacrima NEW SPECIES, N. neibaense NEW SPECIES, N. scabrosum NEW SPECIES, N. simplex NEW SPECIES, N. bankense NEW SPECIES, N. curvum NEW SPECIES, N. dentatum NEW SPECIES, N. fernandoi NEW SPECIES, N. garridoi NEW SPECIES, N. guerreroi NEW SPECIES, +N. minisculum NEW SPECIES, N. nearnsi NEW SPECIES, N. productum NEW SPECIES, N. puertoricense NEW SPECIES, N. serratum NEW SPECIES, N. skelleyi NEW SPECIES, N. teresitae NEW SPECIES, N. altagracia NEW SPECIES, N. basilense NEW SPECIES, N. crenulatum NEW SPECIES, N. darlingtoni NEW SPECIES, N. dolosum NEW SPECIES, N. larseni NEW SPECIES, N. mutabile NEW SPECIES, N. otus NEW SPECIES, and N. purpureum NEW SPECIES). Cnodalon trinitatis Zayas is a synonymized with Cyrtosoma (Nesocyrtosoma) inflatum Marcuzzi NEW SYNONYMY. Cnodalon inflatum Zayas is synonymized with Cyrtosoma (Nesocyrtosoma) tumefactum Marcuzzi NEW SYNONYMY. Cyrtosoma (Nesocyrtosoma) gebieni Marcuzzi is recognized for the first time as Nesocyrtosoma gebieni (Marcuzzi) NEW COMBINATION. The following Zayas Cnodalon species are moved to Nesocyrtosoma under the new combinations: Nesocyrtosoma turquinense (Zayas) NEW COMBINATION, Nesocyrtosoma cuprosum (Zayas) NEW COMBINATION and Nesocyrtosoma elongatum (Zayas) NEW COMBINATION. Cyrtosoma (Nesocyrtosoma) ferruginea Garrido and GutieÌrrez is recognized for the first time as Nesocyrtosoma ferruginea (Garrido and GutieÌrrez) NEW COMBINATION. Cyrtosoma (Pachycyrtosoma) Marcuzzi is synonymized with Nesocyrtosoma NEW SYNONYMY. Cyrtosoma (Pachycyrtosoma) merkli Marcuzzi is here recognized as Nesocyrtosoma merkli (Marcuzzi) NEW COMBINATION, and Cyrtosoma (Pachycyrtosoma) hispaniolae Marcuzzi is here recognized as Nesocyrtosoma hispaniolae (Marcuzzi) NEW COMBINATION. Serrania Garrido is synonymized with Nesocyrtosoma NEW SYNONYMY. Serrania viridula (Zayas) is synonymized with Platydema virens LaPorte and BrulleÌ NEW SYNONYMY, and is recognized as Nesocyrtosoma virens (LaPorte and BrulleÌ) NEW COMBINATION. Apsida cubanensis (Kulzer) is placed in Nesocyrtosoma under the new combination Nesocyrtosoma cubanense (Kulzer) NEW COMBINATION.

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Fadamiro, Henry Yemisi. "Flight behaviour and pheromone communication of the larger grain borer, Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae)." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296831.

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Rugman-Jones, Paul F. "Mechanisms and consequences of post-copulatory sexual selection in the Bruchidae." Thesis, University of Sunderland, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269163.

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Eady, Paul E. "Sperm competition in Callosobruchus maculatus." Thesis, University of Sheffield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263760.

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Whitlow, Sonia. "Recognition in burying beetles (Nicrophorus spp., Silphidae, Coleoptera)." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972110240.

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Lepping, Miles David. "Ground-dwelling beetles as bioindicators in transgenic corn." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/10073.

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Thesis (Ph.D.) -- University of Maryland, College Park, 2009.
Thesis research directed by: Dept. of Entomology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Hewson, Nicola. "Conservation biology of rare leaf beetles (Coleoptera: Chrysomelidae)." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432389.

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Dennis, Peter. "The predatory potential of staphylinid beetles in cereals." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328729.

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Papadopoulou, Anna. "Phylogeography of Tenebrionid beetles in the Aegean archipelago." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5504.

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The Aegean archipelago, which has a mostly continental origin, provides a ‘natural laboratory’ to explore the effects of dispersal limitation on population and community structure. This thesis investigated the phylogeographic, genetic diversity and species richness patterns of the darkling beetles (Coleoptera: Tenebrionidae) of the central Aegean islands. Sampling was conducted on 30 islands and the corresponding coasts of Greece and Turkey and several individuals per taxon and locality were sequenced for mitochondrial and nuclear markers. The generated sequence data were used to: reconstruct phylogenies, calculate population genetic parameters, apply DNA-based species delineation methods, estimate substitution rates and assess macroecological patterns. The results show that many of the existing taxonomic names do not reflect the genetic diversification processes in the archipelago. The majority of the morphological species are split into several geographically confined clades, recognised as ‘independently coalescing entities’. Habitat preference and wing development were identified as two major factors affecting phylogeographic structure, genetic diversity and macroecological patterns. Differences in dispersal propensity were observed between psammophilic taxa inhabiting ephemeral coastal sandy habitats and geophilic taxa associated with presumably stable compact-soil habitats. The widespread geophilic lineages were found to be deeply subdivided along the biogeographic barrier of the ‘mid-Aegean trench’, and the age of this geological event was used as a calibration point to estimate substitution rates and reassess the ‘standard' insect mitochondrial molecular clock. A positive species – genetic diversity correlation was recorded, driven primarily by island sizes and geographic distances, while certain macroecological regularities such as the species – area curve and the distance – decay of similarity relationship could be described at both species and haplotype level. This study demonstrated how palaeogeography, contemporary geography and habitat persistence interact with stochastic processes at population and community level to shape the observed diversity patterns of the Aegean tenebrionid fauna.

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Seeman, Owen. "Mites and passalide beetles : diversity, taxonomy, and biogeography /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16522.pdf.

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BURNE, JEFFREY CAMERON. "A MORPHOMETRIC ANALYSIS OF MORDELLISTENA IN THE SOUTHWESTERN UNITED STATES (COLEOPTERA: MORDELLIDAE)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188064.

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Beetles of the genus Mordellistena Costa are submitted to a morphometric analysis as a more feasible method of identification and as a foundation for the construction of a phylogeny. In the past, species groups were based on questionable morphological characters and a morphological analysis is an attempt, through numerical methods, to eliminate such doubts. Thirty external characters were chosen for measurement in a preliminary statistical analysis of four well defined species groups. These results were submitted to a discriminant analysis which reduced the number of significant characters to 14. Over 500 specimens were then measured for these characters and the results were then submitted to a cluster analysis. The results of the analysis illuminated several relationships among the genus. The analysis found 14 major groups (five or more members), 25 minor groups (4 or fewer members), and 102 odd specimens not assigned to any group. The major groups, two of the minor groups, and the 102 odd specimens are discussed in detail. The accomplishments of the study included an expansion of the list of species of Mordellistena for Arizona, the discovery of several previously undescribed species, a more confident method of identification, and the foundation of a phylogeny for the genus. Shortcomings of the study were the failure to construct species specific groups and failure to group 102 specimens. Both successes and failures of the study are discussed in detail and explanations are offered. The major successes of the study were the formation of a basis for a complete revision of the genus Mordellistena and the foundation of a phylogeny for the group.

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Dury, Guillaume. "Evolution of cycloalexy in neotropical Chrysomeline beetles (Coleoptera: Chrysomelidae)." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119668.

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The larvae of some insects arrange themselves in a tight, orderly circle at rest; a behaviour that Vasconcellos-Neto and Jolivet (1988b) first called "cycloalexy". The word was defined by Jolivet and collaborators in 1990 as a defensive behaviour adopted by insect larvae that form a tight circle with the best defended extremity at the periphery, either heads or abdomens. The formation is also associated with coordinated movements to repel threats. The term has steadily gained acceptance and expanded to include insect nymphs, adult insects and even vertebrates. We review reports of cycloalexy and find the behaviour is less common than suggested. Convincing examples are found only in sawflies, leaf beetles, caterpillars, one weevil and one midge species. We question reports of cycloalexy in penguins, an amphipod crustacean, nymphs of Hemiptera and larvae of Hymenoptera and Neuroptera. We argue that analogous behaviours in mammals are reactive rather than preventive and, hence, not cycloalexic. A molecular phylogeny was reconstructed to evaluate the relationships of 70 species of Neotropical Chrysomelinae and the evolution of cycloalexy. We sequenced five gene segments: nuclear protein-coding CAD and 28S rDNA, mitochondrial 12S rDNA and protein-coding COI and COII. The phylogeny was inferred using Bayesian and Maximum Likelihood (ML) methods and ancestral larval behaviour was reconstructed with ML and Maximum Parsimony methods. The ancestral behaviour reconstructions show five independent evolutionary origins of larval gregariousness in Neotropical chrysomeline beetles, two with maternal care and circular grouping of larvae and one accompanied by cycloalexy. Further, our phylogeny clarifies relationships within Chrysomelinae, and shows a revision is needed: the genus Stilodes is paraphyletic with Zygogramma, Platyphora is polyphyletic and divided into two clades; one with Doryphora nested within and the other with Proseicela.
Les larves de certains insectes forment un cercle serré et ordonné au repos, un comportement appelé « cycloalexie » pour la première fois par Vasconcellos-Neto et Jolivet) (1988b). Le mot a été défini par Jolivet et collaborateurs en 1990 comme étant un comportement défensif de larves d'insectes qui forment un cercle serré, avec l'extrémité la mieux défendue à la périphérie. soit leurs têtes ou leurs abdomens. La formation est aussi associée à des mouvements coordonnés du groupe pour repousser les menaces. Le terme a progressivement gagné en acceptation et s'est élargi pour inclure des nymphes d'insectes, des insectes adultes et même des vertébrés. Nous faisons la revue des rapports de cycloalexie et trouvons que le comportement est moins rependu que suggéré. Les exemples convaincants ne se retrouvent que chez les mouches à scie, les chrysomèles, les chenilles, une espèce de charançon et une de moucheron. Nous questionnons les rapports de cycloalexie chez les manchots, un crustacé amphipode, des nymphes d'hémiptères et des larves d'hyménoptères et de névroptères. Nous suggérons que les comportements analogues chez les mammifères sont réactifs plutôt que préventifs, et donc pas cycloalexiques. Une phylogénie moléculaire a été reconstruite pour évaluer les relations de 70 espèces de Chrysomelinae néotropicales et l'évolution de la cycloalexie. Nous avons séquencé des segments de cinq gènes : les gènes nucléaires CAD codant et 28S ribosomal, et les gènes mitochondriaux 12S ribosomal et COI et COII codants. La phylogénie a été inférée en utilisant des méthodes bayésienne et de Maximum de Vraisemblance (MV), le comportement ancestral des larves a été reconstruit à l'aide de méthodes de MV et de Maximum de Parcimonie. La reconstruction du comportement ancestral montre cinq origines évolutives indépendantes du grégarisme des larves chez les chrysomèles Néotropicales, deux avec soins maternels et regroupement circulaire des larves et une accompagnée de cycloalexie. De plus, notre phylogénie clarifie les relations à l'intérieur des Chrysomelinae, et montre qu'une révision est nécessaire : Stilodes est paraphylétique avec Zygogramma, Platyphora est polyphylétique et divisé en deux clades; l'un avec Doryphora imbriqué dedans et l'autre avec Proseicela.

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Kowles, Katelyn A. "Dynamics of aggregation formation in Japanese beetles, Popillia japonica /." View online, 2009. http://repository.eiu.edu/theses/docs/32211131559299.pdf.

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Schofield, James. "Real-time acoustic identification of invasive wood-boring beetles." Thesis, University of York, 2011. http://etheses.whiterose.ac.uk/1978/.

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Wood-boring beetles are a cause of significant economic and environmental cost across the world. A number of species which are not currently found in the United Kingdom are constantly at risk of being accidentally imported due to the volume of global trade in trees and timber. The species which are of particular concern are the Asian Longhorn (Anoplophora glabripennis), Citrus Longhorn (A. chinensis) and Emerald Ash Borer (Agrilus planipennis). The Food and Environment Research Agency's plant health inspectors currently manually inspect high risk material at the point of import. The development of methods which will enable them to increase the probability of detection of infestation in imported material are therefore highly sought after. This thesis describes research into improving acoustic larvae detection and species identification methods, and the development of a real-time system incorporating them. The detection algorithm is based upon fractal dimension analysis and has been shown to outperform previously used short-time energy based detection. This is the first time such a detection method has been applied to the analysis of insect sourced sounds. The species identification method combines a time domain feature extraction technique based upon the relational tree representation of discrete waveforms and classification using artificial neural networks. Classification between two species, A. glabripennis and H. bajulus, can be performed with 92% accuracy using Multilayer Perceptron and 96.5% accuracy using Linear Vector Quantisation networks. Classification between three species can be performed with 88.8% accuracy using LVQ. A real-time hand-held PC based system incorporating these methods has been developed and supplied to FERA for further testing. This system uses a combination of dual piezo-electric based USB connected sensors and custom written software which can be used to analyse live recordings of larvae in real-time or use previously recorded data.

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Guevara, Roger. "Interactive dynamics between wood-rotting fungi and ciid beetles." Thesis, University of Bath, 1998. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299683.

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Momcilovich, Ashlee Nichole. "The Evolutionary Significance of Body Size in Burying Beetles." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7327.

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Body size is one of the most commonly studied traits of an organism, which is largely due to its direct correlation with fitness, life history strategy, and physiology of the organism. Patterns of body size distribution are also often studied. The distribution of body size within species is looked at for suggestions of differential mating strategies or niche variation among ontogenetic development. Patterns are also examined among species to determine the effects of competition, environmental factors, and phylogenetic inertia. Finally, the distribution of body size across the geographic range of a species or group of closely related is looked at for indications of the effects of climate and resource availability on body size at different latitudes and altitudes. In this collection of research, I address the evolution and importance of body size in burying beetles (genus Nicrophorus). Body size is important to several aspects of burying beetle natural history, including competitive ability, fitness, parental care, climate tolerance, and locomotor activity. In Chapter 1, I use a large data set of body size measurements for seventy of the seventy-three Nicrophorus species to make inferences about the distribution of body size within the genus, across its geographic range, and the importance of body size in speciation. I found that the range of body sizes is not normally distributed, with an overrepresentation of small-sized species. I also found that expansion of the burying beetle range has been restricted by their inability to tolerate warm, dry climates, and therefore the majority of burying beetle diversity occurs in the temperature mid-latitudes of the northern hemisphere. Body size also seems to be important in speciation, as almost all sister taxa are significantly different in body size. In Chapter 2 I use common garden experiments to assess the importance of body size for males and females in competition, reproductive output, and starvation resistance. Body size is equally important for both sexes in starvation resistance, but it is more important for males in competitions for carcasses and for females in reproductive output. In Chapter 3 I test for fitness consequences of multigenerational effects of body size in offspring. I found that the larger offspring that are produced by larger mothers and on larger carcasses had higher fitness than small offspring. In Chapter 4 I test for the possibility of brood parasitism in two species of burying beetles, N. guttula and N. marginatus, which co-occur over part of their geographic ranges. I found that both species are able to detect and remove parasitic larvae. Finally, in Chapter 5 I compiled parent and offspring body sizes from seven species of burying beetles and use them to compare the heritability of body size among species using comparative techniques and a meta-analysis. I found that body size heritability is different between species, but is low for the genus as a whole. Together, these projects provide valuable information on the evolutionary significance of body size in Nicrophorus, and indicate compelling questions for future research into the evolution of body size in burying beetles.

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Baig, Farrukh. "Chemical ecology of Carpophilus beetles and their yeast symbionts." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/202961/1/Farrukh_Baig_Thesis.pdf.

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This thesis is an exciting avenue of research that broadens our understanding of the ecological relationship between microbes and herbivorous insects and applies this knowledge to the development of new "attract and kill" technologies in insect pest management. The outcomes of the research will help improve existing control practices for Carpophilus beetles, which are major pests in Australian horticulture, and pave the way for developing novel tools and practices for monitoring and controlling newly established insect pests.

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Chasez, Heather R. "The effects of age on reproduction in a citrus root weevil Diaprepes abbreviatus." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4868.

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Understanding the factors influencing mate choice is a major focus of sexual selection. Many factors are potentially involved, including age of the individual. The good genes model and the youth advantage model both make predictions about the effect of age on mate choice. Under the good genes model older mates would be the more preferable due to their proven high survivability. The "youth advantage" model, predicts that young to intermediate age males would be more advantageous as mates because of a decrease in sperm quality and the possibility of increased germ-line mutations in older animals. I examined the effects of age on behavioral and physiological factors in Diaprepes abbreviatus experimentally. Both males and females were found to be the least optimal as mates during the intermediate stage of their lives, with preferences for young and old age classes. Females had higher fertilization rates when young and fertilization steadily declined with age, consistent with the youth advantage model. Males overall had higher fertilization rate and procured matings faster when they were older, which was in accordance with the good genes model, though experience could also play a role in this result. These data here suggest that in D. abbreviatus age may play an important role in mate choice decisions.
ID: 029809511; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.)--University of Central Florida, 2011.; Includes bibliographical references (p. 23-28).
M.S.
Masters
Biology
Sciences

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Hale, Lisa A. "Testing the effects of water current velocity on zinc toxicity to Psephenus herricki a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=2000385051&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1279284362&clientId=28564.

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Janse, van Rensburg Lindie. "A morphological analysis of weevils from sub-Antarctic Prince Edward Islands an assessment of ecological influences /." Pretoria : Db [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-08242006-125130.

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Dissertations / Theses on the topic 'Beetles'

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