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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"mouthparts"”.
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The Mouthparts of Ants
Ant mandible movements cover a wide range of forces, velocities and precision. The key to the versatility of mandible functions is the mandible closer muscle. In ants, this muscle is generally composed of distinct muscle fiber types that differ in morphology and contractile properties. Volume …
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The evolution and functional morphology of trap-jaw ants
… success was the diversification their mouthparts. From an ancestral mandibulate condition (still found in many extant taxa), insect mouthparts have diversified into many specialized forms such as the piercing-sucking mouthparts of true bugs and various parasites, the sponging mouthparts …
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Effects of Silicon -Based Fertilizer Applications on the Development and Reproduction of Insect Pests Associated With Greenhouse -Grown Crops
… phloem-feeders with piercing-sucking mouthparts such as citrus mealybug and greenhouse whitefly was not supported by the current study. The use of supplemental silicon-based fertilizers applied to greenhouse-grown crops do not provide host-plant resistance to certain insect pests.
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Effects of Fluid Properties on the Dynamics of Mosquitoes' Ingestion Pumps
… a variety of dietary sources. It examines the mouthparts of insects feeding on plants, other bugs, or vertebrate blood, analyzing how these structures influence or limit their diet. Focusing particularly on mosquitoes, which are a significant public health threat due to their role as vectors of …
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Dung beetles eat plants : insights into the nutritional world of Euoniticellus intermedius (Reiche) (Coleoptera: Scarabaeinae)
… while developing larvae, which have retained the mouthparts of their saprophagous ancestors, digest larger particles in the brood ball and rely on symbionts present in the brood ball to provide breakdown products for their nutrition. Stable isotope analysis was used to trace the source of …
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Morphology and taxonomy of the first instars of the genus <i>Cerococcus</i> Comstock (Homoptera:Coccoidea:Cerococcidae)
… to have well developed legs; well developed mouthparts with a 3-segmented labium; 6-segmented antennae; 2 pairs of spiracles with associated quinquelocular pores; acornshaped spiracular setae or regular setae-shaped spiracular setae; well developed anal lobes which are armed with spines on …
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Biology and integrated pest management of the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), in Southeastern cotton
… pests, L. lineolaris uses piercing-sucking mouthparts to penetrate harvestable fruiting structures on the cotton plant (i.e., squares, flowers, small bolls) leading to significant reductions in lint yield when infestations are above economic injury levels. Economically damaging infestations …
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Mosquito odor receptor gene targets to alter vector host choice
… expression patterns in the An. stephensi mouthparts, which are important to mosquito host seeking behavior. An odor receptor, An. stephensi Or8, which is prominently expressed in the mouthparts was functionally characterized in the empty neuron system. Or8 was found to strongly interact …
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Interactions between Cucumber mosaic virus proteins and host proteins
… between plants by aphids, insects with probing mouthparts that introduce virus particles directly into host cells. The 2b viral suppressor of RNA silencing (VSR) encoded by CMV is a potent counterdefence and pathogenicity factor that inhibits antiviral silencing by titration of short …
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Physical and biochemical properties of entomopathogenic fungal spores
… ingestion was efficacious, and the palps and the mouthparts were found to be the primary infection sites, not the alimentary tract. Hydrophobicity was not found to be a major determinant of spore association with grasshoppers, suggesting that it is the complex and varied topography of this …
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The Ecological Drivers and Consequences of Grass Silicon Accumulation
… studies show that phytoliths abrade grazer mouthparts and interfere with digestion. However, recent phylogenetic analysis and consideration of the fossil record has shed some doubt on the hypothesis that Si accumulation evolved in order to reduce herbivory. In my dissertation research, I …
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Efficacy of fipronil against Amblyomma hebraeum ticks on boer goats and detection of Ehrlichia ruminantium in ticks in Limpopo Province, South Africa
… for this disease occurs. Due to their long mouthparts and specific attachment sites on goats, A. hebraeum is also associated with wounds, secondary abscess formation and lameness. Small stock farmers in the Limpopo Province employ various methods to control A. hebraeum and the negative …
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Disrupting insect-mediated transmission of plant viruses
… on these insects’ specialised piercing mouthparts (stylets). Virus infection can change plant-vector interactions and it is thought that this may accelerate virus transmission. To better understand how to inhibit virus transmission, I studied vectoring of cucumber mosaic virus (CMV) and …
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Dynamics of salticid-ant mimicry systems
… cues (perhaps through the structure of the mouthparts, or the way the two insects move around). So behaviourally, Myrmarachne is a versatile genus apparently under strong selection pressure and showing a high rate of differentiation and speciation. The phylogenetic study also reflects strong …
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The effect of light-limitation on spinescent structural defence and its implications on resistance to herbivory in the shade
… which is contingent on the herbivore and its mouthparts. This investigation was concerned with structural defence presented by spines. This type of defence protects against mammalian herbivores such as browsers. Spiny species do not dominate in low-light deep forest environments. Therefore the …
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Aspects of the ecology of Scolypopa australis (Walker) (Homoptera:Ricaniidae) and its parasite Centrodora scolypopae (Valentine) (Hymenoptera: Aphelinidae)
… instar retains the egg chorion and lacks visible mouthparts, segmentation or tracheae. The third instar has four pairs of spiracles. Adult nutrition, internal and external reproductive systems and mating behaviour are described. Although C. scolypopae females were shown to discriminate between …
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STUDIES ON THE ECOLOGY OF HYALE NILSSONI (RATHKE) 1843, AN ALGAL-INHABITING AMPHIPOD CRUSTACEAN
… sexes was observed.</p><p>Ultrastructure of the mouthparts indicated that both species are equipped to macerate food material, with the assistance of coarse tooth setae. Hyale plumulosa has had fine tooth setae, and plumose antennae. These antennae could be bent towards the mouth and brushed past …
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Eco-physiological and molecular manipulation of leaf-level primary and secondary metabolism by arthropod herbivory
… The type of feeding damage depends on the mouthparts of the herbivore and, in part, determines the magnitude and mechanism by which photosynthesis is altered. However, there is a lack of understanding of these effects across model systems to evaluate conserved mechanisms of plant responses …
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Integrated pest management of squash bug, Anasa tristis, for conventional and organic cucurbit systems in Virginia
… pepo L.) systems. Using its piercing sucking mouthparts, squash bug feeds on both leaf tissue and fruits, potentially leading to leaf necrosis, seedling death, and yield loss. Currently, A. tristis management strategies in summer squash focus exclusively on insecticide applications. Given that …
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Batrachochytrium dendrobatidis in Central California
… (2001) consisted of examining larval amphibian mouthparts for abnormalities and or defects, based on their hypothesis that mouthpart defects are clinical signs of BD infection. Sensitivity and specificity of the diagnostic screening test were 76% and 58%, respectively, indicating that the …
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