Global ETD Search
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 102 for “"nymphs"”.
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The Mayfly Nymphs (Insecta: Ephemeroptera) of the Guadalupe River Basin, Texas
No abstract prepared.
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A morphological study of first-stage nymphs of five Periplaneta species (Dictyoptera: Blattidae)
… stages. There are very few descriptions of the nymphs of any Periplaneta species, and those that are available are rather brief and not completely accurate. This paper presents detailed descriptions and keys to the first-stage nymphs of the above species. Five types of setae, including unique …
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Relation between tolerances and distribution of two species of Ephemeroptera
… been determined in the laboratory for aquatic nymphs of two mayflies, Baetis harrisoni Barnard 1932 and Choroterpes (Euthraulus) bugandensis (Kimmins 1956). These limits have been examined in the light of available information on the ecology of the nymphs, in order to see to what extent the …
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Caracterização taxonômica e biologia de uma espécie de Kempnyia Klapálek (Plecoptera, Perlidae) em um riacho da Floresta da Tijuca, Rio de Janeiro (RJ)
The adults and nymphs of Kempnyia tijucana are herein described, being differentiated from the other species of the genus by distinct morphological characters. ln the nymphs the absence of the intersegmental gills III is remarkable, not occurring in any other species of the genus. The comparison …
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Host plant effects on the biology, behavior and ecology of brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae)
… and the high dispersal capacity of adults and nymphs. Interactions between H. halys and its hosts were investigated via laboratory and field experiments. Rearing H. halys nymphs in the laboratory on several of its known wild and tree fruit hosts used alone and in combination showed that peach …
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Ecology and energetics of an aquatic detritivore, Pteronarcys proteus (Plecoptera: Pteronarcyidae)
… food habits, energetics, and production by nymphs of Pteronarcys proteus were measured. The life cycle lasted four years in an Appalachian mountain stream in southwestern Virginia. Adults emerged late May to early June, and eggs deposited did not hatch until the following spring. Nymphs grew …
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The Life History and Contributions to the Ecology of Camelobaetidius variabilis Wiersema 1998 (Ephemeroptera: Baetidae) in Honey Creek, Oklahoma
… in external morphology. Laboratory reared nymphs were used to calculate number of degree days to complete development (772 degree days at 20.8° C ±.38° C), which was used to determine voltinism. Field collected nymph microhabitat distribution was used in assessing microhabitat distribution. …
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Physiological, population, and genetic responses of an aquatic insect (Isonychia bicolor) to chronic mercury pollution
… respiration experiments indicated that small nymphs were more sensitive to mercury than larger nymphs, and that sensitivity increased with temperature. In addition, mayfly nymphs from polluted sites on the less contaminated South River were found to be more resistant to sublethal doses of …
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Studies of Susceptibility of Broad-Headed Skinks (<em>Eumeces laticeps</em>) and Laboratory Mice (<em>Mus musculus</em>) to Strain MI-2 of <em>Borrelia burgdorferi</em> and Vector Competence of the Tick <em>Ixodes scapularis</em>
… 1 putativcly infected <em>Ixodes scapularis</em> nymphs. In contrast, seven of eight (88%) needle-inoculated mice were successfully infected with MI-2 strain spirochetes. Furthermore, nymphs that resulted from larval feedings on culture positive mice successfully transmitted <em>B. …
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A laboratory study of the predation response of Nabis americoferus Carayon to prey models and notes on the biology of the species
… response of fifth instar Nabis americoferus nymphs and biology studies of nymphs and adults of the species were conducted in the laboratory at a constant temperature of 80°F and in a 14-hour photoperiod. The average lengths of the five nymphal stadia normal in this species, in order of …
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Effects of an insect growth regulator (hydroprene) on the morphology of genitalia, development and reproduction of the oriental cockroach, Blatta orientalis L. (Dictyoptera: Blattidae)
… applied to substrata where oriental cockroach nymphs, Blatta orientalis, were reared. A detailed study of the morphology of B. orientalis external genitalia indicated that hydroprene affected the development of these structures. Both the male and female genitalia were malformed after exposure …
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The effects of three insecticides on oothecal-bearing German cockroach, Blattella germanica L., (Dictyoptera: Blattellidae), females
… nymphal survival, and the percentage of nymphs able to move about freely 24 hours post-emergence. The comparisons of these factors were made not only on prematurely dropped oothecae but also on oothecae retained by females, and oothecae that were manually detached from females. Premature …
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Methods for management of Tyrophagus putrescentiae (Schrank) (Sarcoptiformes: Acaridae) in dry-cured ham facilities
… 10 eggs and groups of a mixture of 40 adults and nymphs were separately exposed to several high and low temperatures, ranging from +35 to 45°C and from −20 to +5°C, for several time periods. Eggs were found to be more tolerant to both high and low temperatures compared with adults and nymphs. …
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Life History and Secondary Production of Caenis latipennis Banks (Ephemeroptera: Caenidae) in Honey Creek, Oklahoma
… 2000. The first instar nymph was described. Nymphs were separated into five development classes. Laboratory egg and nymph development rates, emergence, fecundity, voltinism, and secondary production were analyzed. C. latipennis eggs and nymphs take 132 and 1709 degree days to develop. C. …
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Investigation of DNA Variability and Phylogenetic Relationships of Perlesta (Plecoptera: Perlidae) in Mississippi
… small, brown stonefly adults and freckled yellow nymphs have gone by the name of the type species of the genus, <em>Perlesta placida</em>, but taxonomic work in the genus since 1989 has resulted in the recognition of additional species. These species were mostly recognized and described using …
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Investigations into the vector competency of arthropods for two Ehrlichias: Ehrlichia risticii and Cowdria ruminantium
… transmit C. <i>ruminantium</i> and was febrile. Nymphs from both laboratory groups were simultaneously fed on a goat that had been infected with C. <i>ruminantium</i> and was febrile. Engorged nymphs from both groups were replete from feeding on three consecutive days. Nymphs from both groups …
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Sublethal effects of carbofuran and methidathion on reduviolus americoferus (carayon) (Hemiptera: Nabidae)
… carbofuran, or LC₀ or LC₅ methidathion. Female nymphs which survived exposure to LC₃₅ carbofuran reached the 3rd instar more quickly than control nymphs, whereas methidathion tended to slow development to the 3rd instar. Neither insecticide significantly affected the duration of the 3rd-5th …
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Vector Potential of Two Southeastern Tick Species (Acari: Ixodidae) for a Northeastern Strain of the Lyme Disease Spirochete, <em>Borrelia burgdorferi</em> Sensu Stricto
… <em>musculus</em> L. (laboratory mice). Fed nymphs were tested for infection via tick culture and their host rodents were tested for infection via ear clip tissue in BSK-H medium culture. Ixodes scapularis larvae were then ted on the same SH2-82 infected hamsters one week after <em>I</em>. …
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Integrated pest management of squash bug, Anasa tristis, for conventional and organic cucurbit systems in Virginia
… manual removal of all squash bug egg masses and nymphs, while infested plants were left to have natural densities of squash bug life stages. We performed weekly A. tristis surveys on all infested plants in both years and added H. pennsylvanicus surveys on infested and managed plants in 2021. …
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Effects Of Thermal Acclimation On The Critical Thermal Maxima Of The Tropical Cockroaches: Blaptica Dubia, Eublaberus Posticus And Blaberus Discoidalis (blaberidae)
… CTMax was determined for adults and first instar nymphs of three species of tropical cockroaches: Blaptica dubia, Eublaberus posticus, and Blaberus discoidalis. Adult cockroaches were acclimated to temperatures of 10°C, 15°C, 20°C, 25°C, 31°C and 37°C for a period of seven days. Blaptica dubia was …
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