Global ETD Search
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Showing 1 to 16 of 16 for “"numerical response"”.
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Oystercatchers and cockles : a predatory-prey study
… ate cockles followed a type II functional response. The plateau was not caused solely by handling time, nor were satiation or interference important. Analysis of the functional responses of other birds feeding on one prey species showed that in each case the behaviour also conformed with a …
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Geometry Projection Methods for Shape and Topology Optimization
… domain methods because they simplify the response analysis by eliminating the need for remeshing when the design changes and because they are naturally suitable for topology optimization. Here, the unambiguous geometry is projected onto the analysis space by means of a filtering technique. …
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Leptothrips mali (Fitch): a potentially important predator in Virginia apple orchards
… most abundant predators and appeared to respond numerically to densities of A. schlechtendali. O. insidiosus and D. nebulosus usually increased late in the season and S. punctum responded to densities of P. ulmi inconsistently but together with thrips may have had an important role in reducing P. …
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Effect of predators on population dynamics of green peach aphid on flue-cured tobacco in Virginia
… However, CLB was the only predator that had a numerical response to increasing GPA density on tobacco. In the laboratory, the minimum number of GPA required to initiate reproduction in CLB, and the conversion rates were two factors that determined the oviposition rate of CLB. In fields, CLB …
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Factors affecting the mortality of winter moth in the lower mainland of British Columbia
… C. albi cans may be a mechanism for inducing a numerical response among generalist predators. However, simultaneous population declines at sites with low levels of C. albicans indicate that winter moth outbreak and decline in North America may be induced by a number of different factors.
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A comparison of two instructional methods for drawing Lewis structures
… process. The pretest/posttest consisted of 23 numerical response questions and 2 to 6 free response questions that were graded using a rubric. A two-way ANOVA showed a significant interaction effect between the groups and the methods, F (1, 70) = 10.960, p = 0.001. Post hoc comparisons using …
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Release and monitoring of Laricobius nigrinus (Coleoptera: Derodontidae) for biological control of the hemlock woolly adelgid in the eastern US
… to ovisac density, indicating an aggregation and numerical response to its prey. Laricobius nigrinus has not demonstrated complete biological control of HWA to date, but it may do so in the future and continued release is justified.
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Autumn Foraging and Staging Ecology of Eastern Population Sandhill Cranes (Antigone canadensis tabida)
… topics: 1) age-specific foraging scale and numerical response, 2) age-specific foraging efficiency, and 3) roost use. I used field observation and experimentation, GPS tracking, and GIS analysis to investigate these topics at a key staging area on Manitoulin Island, Ontario, Canada. Although …
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Pre-release Evaluation of Laricobius osakensis Montgomery and Shiyake (Coleoptera: Derodontidae), a Potential Biological Control Agent for the Hemlock Woolly Adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), in the Eastern United States
… and reproduces only on A. tsugae. The functional response "prey consumption changes in response to changes in prey density" was similar for both L. osakensis and Laricobius nigrinus Fender adults. However, L. osakensis had a higher numerical response"changes in oviposition in response to changes …
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An investigation of the growth and feeding responses of oligotrich ciliates to food types and concentrations : an approach to assessing the potential of marine planktonic ciliate blooms
… ciliate populations on short term algal blooms. Numerical and functional responses (growth and grazing rates with varied food concentration)were established for 5 marine planktonic ciliates and were used in a model to examine predator-prey dynamics of ciliates and 8 Am algae. The ciliates …
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A Study of factors influencing a non-cyclic, island population of snowshoe hares
… to predation which followed a Type II functional response and a 1-year-delayed density-dependent numerical response. This model produced cycles with a period of 9 years and a maximum hare density of 3.15 hares/ha. I concluded from this study that the observed differences in population dynamics …
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Nonlinear Electromechanical Deformation of Isotropic and Anisotropic Electro-Elastic Materials
… materials, which produce large deformations in response to an electric stimulus. EAPs have attractive characteristics of being lightweight, inexpensive, stretchable, and flexible. Additionally, EAPs are conformable, and their properties can be tailored to satisfy a broad range of requirements. …
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Biological control of Culex mosquitoes using multiple predators
… which are often poorly understood. A functional response (FR) approach is frequently used to derive per capita ecological impacts of biocontrol agents towards target organisms, and can be applied to quantify context-dependencies of interaction strengths. However, the use of FRs alone fails to …
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Invasive species: fundamental and applied science
… Based on the effective Comparative Functional Response method, which highlights damaging IAS by comparing their greater per capita maximum feeding rates relative to trophically analogous natives, it enhances prediction by accounting for proxies of numerical response, such as abundance. It …
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Assessment and prediction of the potential threats of temperature change and invasive species to the sustainability of Northern Irish sea fisheries
… interactions. Comparative functional response analysis has been used to gain insight into resource dependent behaviour and population dynamics. This study is an assessment of the way in which predicted temperature changes can affect resource consumption in three predators. The red …
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Sulla progettazione in zona sismica di strutture dotate di dissipatori fluido-viscosi: proposta di una metodologia
… tests carried out by some authors on the response of these devices to external forces are discussed. On this purpose we report some technical schedules that are usually enclosed to the devices now available on the international market. In the third section we show also some analytic models …